MTS SWIFT 10 User Manual

be certain.

SWIFT® 10 ATV Sensor Product Information

Spinning Wheel Integrated Force Transducer

For Recreational and Small Vehicles

100-183-736 C

Trademark information MTS, SWIFT, TestStar, and TestWare are registered trademarks of MTS Systems

Corporation within the United States. These trademarks may be protected in other countries.

Microsoft, Windows, Windows for Workgroups, Windows 95, and Windows NT are registered trademarks of Microsoft Corporation. Apple and Macintosh are registered trademarks of Apple Computer, Inc. UNIX is a registered trademark of The Open Group. LabVIEW is a registered trademark of National Instruments Corporation.

Publication information

MANUAL PART NUMBER PUBLICATION DATE

100-183-736 A February 2008

100-183-736 B April 2008

100-183-736 C November 2008

Technical Support 7

How to Get Technical Support 7

Before You Contact MTS 7

If You Contact MTS by Phone 9

Problem Submittal Form in MTS Manuals 10

Preface 11

Before You Begin 11

Conventions 12

Documentation Conventions 12

Hardware Overview 15

Overview 16

Spinning Applications (Track or Road) 18

Non-spinning Applications (Laboratory) 19

Construction 20

Design Features 23

Coordinate System 24

Specifications 26

Calibration 30

Transducer Interface 32

TI Front Panel 35

TI Rear Panel 36

Interfacing with RPC 37

Software Utilities 39

Introduction 40

TI2STATUS - Transducer Interface Status 41

Description of TI2STATUS Indications 41

TI2XFER - Transducer Interface Transfer 43

TI2SHUNT - Transducer Interface Shunt 45

Setting Up Shunt Calibration Reference Values 48

Error Messages 49

SWIFT 10 ATV Sensors Contents

Setting up the Transducer Interface 51

USB driver installation 52

Select a Zero Method 54

Calibration File Elements 55

Upload the Calibration File 56

Edit the Calibration File 57

Download the Calibration File 60

Installing the Transducer 61

Hazard Icon 62

Road and Track Vehicles 63

Attaching SWIFT Components to the Vehicle 67

Attaching Anti-rotate Assemblies 70

Installing the Transducer Interface Electronics 74

Setting up the SWIFT Sensor for Data Collection 77

Verifying the Quality of the Zero Procedure 80

Collecting Data 82

Road Simulator 85

Attaching SWIFT Components to the Fixturing 88

Zeroing the Transducer Interface 92

Analyzing SWIFT Data 97

The Data 98

Fx Data (Longitudinal Force) 99

Fz Data (Vertical Force) 101

Mx Data (Overturning Moment) 102

My Data (Brake Moment) 105

Acceleration and Braking Events Example 107

Slalom Curve Driving Example 109

Maintenance 111

Transducer 112

Transducer Interface 114

Cables 115

Contents

SWIFT 10 ATV Sensors

Troubleshooting 117

Assembly Drawings 129

Cable Drawings 130

SWIFT 10 Mechanical Drawings 136

SWIFT 10 ATV Sensors Contents

Contents

SWIFT 10 ATV Sensors

Technical Support

How to Get Technical Support

Start with your

manuals

Technical support

methods

MTS web site

www.mts.com

E-mail techsupport@mts.com

Telephone MTS Call Center 800-328-2255

Fax 952-937-4515

Technical support

outside the U.S.

The manuals supplied by MTS provide most of the information you need to use and maintain your equipment. If your equipment includes MTS software, look for online help and README files that contain additional product information.

If you cannot find answers to your technical questions from these sources, you can use the internet, e-mail, telephone, or fax to contact MTS for assistance.

MTS provides a full range of support services after your system is installed. If you have any questions about a system or product, contact MTS in one of the following ways.

The MTS web site gives you access to our technical support staff by means of a Technical Support link:

www.mts.com > Contact MTS > Service & Technical Support

Weekdays 7:00 A.M. to 5:00 P.M., Central Time

Please include “Technical Support” in the subject line.

For technical support outside the United States, contact your local sales and service office. For a list of worldwide sales and service locations and contact information, use the Global MTS link at the MTS web site:

www.mts.com > Global MTS > (choose your region in the right-hand column) > (choose the location closest to you)

Before You Contact MTS

MTS can help you more efficiently if you have the following information available when you contact us for support.

Know your site

number and system

number

SWIFT 10 ATV Sensors Technical Support

The site number contains your company number and identifies your equipment type (material testing, simulation, and so forth). The number is usually written on a label on your MTS equipment before the system leaves MTS. If you do not have or do not know your MTS site number, contact your MTS sales engineer.

Example site number: 571167

When you have more than one MTS system, the system job number identifies which system you are calling about. You can find your job number in the papers sent to you when you ordered your system.

Example system number: US1.42460

Know information from

prior technical

If you have contacted MTS about this problem before, we can recall your file. You will need to tell us the:

assistance

• MTS notification number

• Name of the person who helped you

Identify the problem Describe the problem you are experiencing and know the answers to the

following questions:

• How long and how often has the problem been occurring?

• Can you reproduce the problem?

• Were any hardware or software changes made to the system before the

problem started?

• What are the model numbers of the suspect equipment?

• What model controller are you using (if applicable)?

• What test configuration are you using?

Know relevant

computer information

Know relevant

software information

If you are experiencing a computer problem, have the following information available:

• Manufacturer’s name and model number

• Operating software type and service patch information

• Amount of system memory

• Amount of free space on the hard drive in which the application resides

• Current status of hard-drive fragmentation

• Connection status to a corporate network

For software application problems, have the following information available:

• The software application’s name, version number, build number, and if

available, software patch number. This information is displayed briefly when you launch the application, and can typically be found in the “About” selection in the “Help” menu.

• It is also helpful if the names of other non-MTS applications that are

running on your computer, such as anti-virus software, screen savers, keyboard enhancers, print spoolers, and so forth are known and available.

Technical Support

SWIFT 10 ATV Sensors

If You Contact MTS by Phone

Your call will be registered by a Call Center agent if you are calling within the United States or Canada. Before connecting you with a technical support specialist, the agent will ask you for your site number, name, company, company address, and the phone number where you can normally be reached.

If you are calling about an issue that has already been assigned a notification number, please provide that number. You will be assigned a unique notification number about any new issue.

Identify system type To assist the Call Center agent with connecting you to the most qualified

technical support specialist available, identify your system as one of the following types:

• Electromechanical materials test system

• Hydromechanical materials test system

• Vehicle test system

• Vehicle component test system

• Aero test system

Be prepared to

troubleshoot

Write down relevant

information

After you call MTS logs and tracks all calls to ensure that you receive assistance and that action

Prepare yourself for troubleshooting while on the phone:

• Call from a telephone when you are close to the system so that you can try

implementing suggestions made over the phone.

• Have the original operating and application software media available.

• If you are not familiar with all aspects of the equipment operation, have an

experienced user nearby to assist you.

Prepare yourself in case we need to call you back:

• Remember to ask for the notification number.

• Record the name of the person who helped you.

• Write down any specific instructions to be followed, such as data recording

or performance monitoring.

is taken regarding your problem or request. If you have questions about the status of your problem or have additional information to report, please contact MTS again and provide your original notification number.

SWIFT 10 ATV Sensors Technical Support

Problem Submittal Form in MTS Manuals

Use the Problem Submittal Form to communicate problems you are experiencing with your MTS software, hardware, manuals, or service which have not been resolved to your satisfaction through the technical support process. This form includes check boxes that allow you to indicate the urgency of your problem and your expectation of an acceptable response time. We guarantee a timely response—your feedback is important to us.

The Problem Submittal Form can be accessed:

• In the back of many MTS manuals (postage paid form to be mailed to MTS)

• www.mts.com > Contact Us > Problem Submittal Form (electronic form to

be e-mailed to MTS)

Technical Support

SWIFT 10 ATV Sensors

Preface

Before You Begin

Safety first! Before you attempt to use your MTS product or system, read and understand the

Safety manual and any other safety information provided with your system. Improper installation, operation, or maintenance of MTS equipment in your test facility can result in hazardous conditions that can cause severe personal injury or death and damage to your equipment and specimen. Again, read and understand the safety information provided with your system before you continue. It is very important that you remain aware of hazards that apply to your system.

Other MTS manuals In addition to this manual, you may receive additional MTS manuals in paper or

electronic form.

If you have purchased a test system, it may include an MTS System Documentation CD. This CD contains an electronic copy of the MTS manuals that pertain to your test system, including hydraulic and mechanical component manuals, assembly drawings and parts lists, and operation and preventive maintenance manuals. Controller and application software manuals are typically included on the software CD distribution disc(s).

SWIFT 10 ATV Sensors Preface

Conventions

DANGER

WARNING

CAUTION

Conventions

Documentation Conventions

The following paragraphs describe some of the conventions that are used in your MTS manuals.

Hazard conventions As necessary, hazard notices may be embedded in this manual. These notices

contain safety information that is specific to the task to be performed. Hazard notices immediately precede the step or procedure that may lead to an associated hazard. Read all hazard notices carefully and follow the directions that are given. Three different levels of hazard notices may appear in your manuals. Following are examples of all three levels.

Note For general safety information, see the safety information provided with

your system.

Danger notices indicate the presence of a hazard with a high level of risk which, if ignored, will result in death, severe personal injury, or substantial property damage.

Warning notices indicate the presence of a hazard with a medium level of risk which, if ignored, can result in death, severe personal injury, or substantial property damage.

Caution notices indicate the presence of a hazard with a low level of risk which, if ignored, could cause moderate or minor personal injury, equipment damage, or endanger test integrity.

Notes Notes provide additional information about operating your system or highlight

easily overlooked items. For example:

Note Resources that are put back on the hardware lists show up at the end of

the list.

Special terms The first occurrence of special terms is shown in italics.

Illustrations Illustrations appear in this manual to clarify text. It is important for you to be

aware that these illustrations are examples only and do not necessarily represent your actual system configuration, test application, or software.

Electronic manual

conventions

This manual is available as an electronic document in the Portable Document File (PDF) format. It can be viewed on any computer that has Adobe Acrobat Reader installed.

Preface

SWIFT 10 ATV Sensors

Conventions

Hypertext links The electronic document has many hypertext links displayed in a blue font. All

blue words in the body text, along with all contents entries and index page numbers, are hypertext links. When you click a hypertext link, the application jumps to the corresponding topic.

SWIFT 10 ATV Sensors Preface

Conventions

Preface

SWIFT 10 ATV Sensors

Hardware Overview

Contents Overview 16

Spinning Applications (Track or Road) 18

Non-spinning Applications (Laboratory) 19

Construction 20

Design Features 23

Coordinate System 24

Specifications 26

Calibration 30

Transducer Interface 32

TI Front Panel 35

TI Rear Panel 36

Interfacing with RPC 37

SWIFT 10 ATV Sensors Hardware Overview

Overview

Data

S10-01

Track or Road

Laboratory Simulation

WARNING

Overview

The MTS Spinning Wheel Integrated Force Transducer (SWIFT®) sensor is a light-weight, easy-to-use transducer that enables you to conduct faster, less expensive data acquisition and road simulation testing.

The transducer is designed for use on the test track and public roads, as well as in the test laboratory. It attaches to the test vehicle or an MTS Series 329 Road Simulator using an adapter and a modified wheel rim.

You can achieve excellent data correlation using the same transducer and vehicle on the test track or public road and on a road simulator. It is available in various sizes and materials to fit various vehicle and loading requirements.

Hardware Overview

Driving a vehicle with SWIFT sensors mounted on it will change the handling characteristics of the vehicle.

Driving a vehicle configured in this way on public roads can pose unexpected dangers to pedestrians and other vehicle traffic.

Only authorized, licensed drivers, who are experienced driving a vehicle with SWIFT sensors mounted on it, should be allowed to operate the vehicle on public roads. Drive the vehicle with the SWIFT sensor attached on closed courses only until you have proper experience.

When driving the vehicle on public roads, you must conform to all local laws and regulations.

SWIFT 10 ATV Sensors

Overview

CAUTION

Parts replacement,

disassembly, and care

The SWIFT sensor assembly, Transducer Interface box, and the accessory components have no user serviceable parts. These components should not be disassembled other than as outlined in “Troubleshooting” beginning on page 117.

Do not disassemble the SWIFT sensor, Transducer Interface (TI) electronics, and accessory components.

The SWIFT sensor, TI electronics, and accessory components are not intended to be disassembled, other than as outlined in “Troubleshooting”.

Disassembling or tampering with these components may result in damage to the sensor, loss of watertight seal, and voiding of the warranty.

• The sensor assembly should be returned to MTS annually for recalibration

and inspection.

• Clean the sensor assembly after each use, as described in Maintenance

beginning on page 111, especially if it is exposed to corrosive or abrasive material, such as salt or sand.

• Read and follow all warnings and cautions affixed to the transducer and in

this manual especially those warnings and cautions that deal with installation, use, inspection and maintenance of the transducer.

The SWIFT sensor assembly should not:

• Be allowed to strike hard surfaces or objects while driving the vehicle.

• Be driven through grass or brush that is taller than the bottom edge of the

sensor.

• Be exposed to loads that exceed the full scale calibrated ranges. Refer to the

calibration sheets accompanying your transducers.

• Be used if the integrity of the sealed cover has been compromised or the

warning label has been removed.

• Be used if the sensor assembly shows indications of damage (such as dents

on the transducer or slip ring assembly, a bent anti-rotate assembly, etc.).

• Be used if any part of the assembly has been modified without explicit,

written authorization from MTS.

SWIFT 10 ATV Sensors Hardware Overview

Spinning Applications (Track or Road)

Customer Supplied

Power Supply

Customer Supplied

Data Recorder

Transducer

Interface (TI)

Transducer Signals

Output

Signals

S10-02

Spinning Applications (Track or Road)

The SWIFT sensor can be used for road load data acquisition (RLDA) applications:

• Durability

• Noise, Vibration and Harshness (NVH)

• Ride and Handling

• Tire Performance

The transducer is durable enough to withstand harsh road testing and data acquisition environments. The transducer is splash resistant and suitable for use in conditions where the test vehicle will encounter occasional standing or running water, or will be exposed to precipitation. However, it should not be submerged.

In a typical spinning application, the transducer is mounted on a modified rim of a tire on a test vehicle, as shown in the following figure. The Transducer Interface (TI), power supply, and data recorder can be securely mounted on a carriage rack. The TI box should be protected against environmental conditions (water and mud splashes and dust), and it should not be allowed to be immersed.

Hardware Overview

Spinning Application (Track or Road)

SWIFT 10 ATV Sensors

Non-spinning Applications (Laboratory)

Power Supply (with 4

connections)

Customer-Supplied

Test Control System

Transducer

Interface (TI)

Transducer Signals

Output

Signals

PC Communication

S10-03

Non-spinning Applications (Laboratory)

The SWIFT sensor can be fully integrated into the simulation process, since it is an optimal feedback transducer for use with MTS Remote Parameter Control

) software. The transducer takes data at points where fixturing inputs are

(RPC located rather than at traditional instrumentation points along the vehicle’s suspension. Using the SWIFT sensor saves you instrumentation time, and fewer iterations are required to achieve good simulation accuracy.

Measuring spindle loads allows engineers to generate generic road profiles. Generic road profiles are portable across various vehicle models, do not require new test track load measurements for each vehicle, and eliminate additional RLDA tasks.

Several of the six loads measured by the transducer directly correlate to the MTS Model 329 Road Simulator inputs.

The same transducers used to collect road data can be mounted directly in the wheel adapters of the MTS Model 329 Road Simulator. For durability testing, the SWIFT sensor can be used for iterations within the RPC process. The SWIFT sensor should then be removed for the durability cycles, to preserve its fatigue life. It can be replaced by an adapter plate, available from MTS, to duplicate the mass and center of gravity of the actual SWIFT sensor. If a SWIFT sensor is to be used during full durability tests, we suggest using the titanium model, which has a higher fatigue rating.

In a typical non-spinning application, a SWIFT sensor is mounted on a road simulation test fixture, as shown in the following figure.

Non-spinning Application (Laboratory Simulation)

SWIFT 10 ATV Sensors Hardware Overview

Construction

Slip Ring

Bracket

(with encoder)

Washer

Plate

Transducer

Modified Wheel Rim

Lug Nuts

Inner Hub

Adapter

S10-08

Construction

The SWIFT sensor has one-piece construction for outstanding fatigue life, low hysteresis, and high stiffness. Its compact package has a minimal effect on inertia calculations, and a minimal dynamic effect on the test vehicle.

The transducer can be used for developing conventional durability tests on the MTS Model 329 Road Simulator. Normally, the transducer is replaced with an equivalent wheel adapter after the simulation drive signals are developed and prior to the start of the test.

The SWIFT sensor includes several mechanical and electrical components.

Hardware Overview

Transducer The transducer attaches directly to a modified wheel rim. On the test track

vehicle, the transducer spins with the wheel. On a road simulator, the transducer attaches directly to an adapter plate on the 329 spindle housing. The slip ring can be used to accommodate the range of motion of the rear swing arm.The transducer is available in two materials.

The transducer’s unibody design means there are no multiple parts welded or screwed together.

The transducer has four beams with strain gages that measure six orthogonal outputs:

Fx—longitudinal force

Fy—lateral force

Fz—vertical force

Mx—overturning moment

My—acceleration and brake torque

Mz—steering moment

It has onboard conditioning and amplifiers to improve the signal-to-noise ratio.

SWIFT 10 ATV Sensors

Construction

Anti-Rotate

Assembly

Slip Ring

and Encoder

Slip Ring

Bracket

Alternate

Spindle Hub

Interface

(for hub piloted

spindle)

Coupling Teeth

Interface

Transducer

Interface

Cable

Washer

Plate

Transducer

Vehicle

Spindle Hub

Inner

Hub Adapter

Anti-Rotate

Mounting Bracket

(customer supplied)

S10-04

Inner hub adapter The inner hub adapter attaches to the inner diameter of the transducer and the

spindle face of the vehicle. The inner hub adapter enables you to maintain the original position of the tire on the vehicle (the tire will not protrude from the vehicle) while the transducer is attached to the vehicle.

Components Set Up for Test Track

Slip-ring bracket The slip-ring bracket attaches the slip ring to the transducer. It has internal wiring

that provides excitation power to the strain gage bridges and brings signals out from the transducer to the slip ring.

Encoder An encoder measures the angular position of the transducer. The SWIFT sensor

encoder is integrated into the slip ring assembly, and counts off “ticks” to measure the angular position as the wheel rotates. It measures 2048 (512 pulse quadrature) points per revolution (ppr) with a resolution of 0.18 degrees.

Slip ring The slip ring allows you to output the transducer bridge signals and angular

position to the TI. A transducer data cable attaches from the slip ring to the back panel of the TI.

Anti-rotate device The anti-rotate device is attached to the slip ring and the vehicle’s suspension (or

other non-rotating point). It is able to move up and down with the vehicle. Its primary function is to provide a fixed reference point for the angle sensor. Its secondary function is to prevent the cable from rotating with the wheel and becoming tangled or breaking.

The slip ring and anti-rotate device are used mainly for road data collection. Although it can also be used for short periods of time on a road simulator. MTS does not recommend this use. Due to the extreme fatigue loading characteristics

SWIFT 10 ATV Sensors Hardware Overview

of durability testing on road simulators, we suggest that you either remove the slip ring assembly before installing the vehicle on a road simulator, or use it only for iteration passes, then promptly remove it.

Construction

The anti-rotate device should be configured such that no loading occurs to the slip ring throughout all loading and suspension travel. This means that when you attach the anti-rotate device to the vehicle, you must consider all possible motion of the suspension. The anti-rotate device should not bump against the wheel well at any time; any jarring of the anti-rotate arm will damage the slip ring. For steering axles, the anti-rotate bracket must be mounted to part of the unsprung suspension that steers with the tire, such as the brake caliper. For additional antirotate device mounting recommendations, refer to the Anti-Rotate Customer/ User Assembly drawing at the back of this manual.

Transducer Interface

(TI)

Additional

components

The TI provides power to the transducer and uses previously stored calibration values to convert the raw transducer signals from the bridge outputs and the encoder to three force outputs (Fx, Fy, Fz), three moment outputs (Mx, My, Mz) and an angle output. The force and moment outputs have a value of 10 V full scale, unless a different full-scale output is requested by a customer. The angle output is a 0–5 V sawtooth output.

Additional components that are supplied with your SWIFT sensor include transducer data cables, TI power cable, a SWIFT Transducer Interface Utilities CD or disk, and the calibration file. MTS can also provide a 12 V DC power converter for use in the test laboratory.

Hardware Overview

SWIFT 10 ATV Sensors

Design Features

Flexure isolation The SWIFT sensor has a very stiff outer ring and flexured beam isolation which

Thermal stability The entire sensor is machined from a solid, specially forged billet of high

Construction

render it relatively insensitive to stiffness variations in matings with rims and road simulator fixtures.

Flexure isolation minimizes thermal expansion stresses. With flexure isolation, if the inner hub experiences thermal expansion the beams are allowed to expand out, resulting in lower compressive stress on the beams.

strength titanium or aluminum. The absence of bolted joints permits an efficient transfer of heat across the sensor structure, minimizing temperature differentials in the gaged area.

The transducer is designed to accommodate the high temperature environments that occur during severe driving and braking events. Individual temperature compensation of each strain gage bridge minimize temperature induced variations in accuracy. Since minimal electronics reside on the SWIFT sensor, it can easily tolerate high temperatures. The temperature rating for the SWIFT sensor is 125° C (257° F) at the spindle hub.

Temperature compensation is done on each bridge for better performance in transient or non-uniform temperature occurrences.

Low hysteresis The SWIFT sensor has very low hysteresis, since the sensing structure is

constructed with no bolted joints. Micro slippage in bolted joints contributes most of the hysteresis in highly stressed structures. Hysteresis errors due to micro-slip at joints can contribute to unresolvable compounding errors in coordinate transformation of the rotating sensor.

Low noise The SWIFT sensor uses a slip ring rather than telemetry for the transducer output

signals. On-board amplification of the transducer bridges minimizes any slip ring noise contribution.

Low cross talk The advanced design of the SWIFT sensor means that it has very low cross talk.

The alignment of the sensing element is precision machined. This alignment is critical to achieving minimum cross talk error between axes and minimum errors in coordinate transformation (from a rotating to a non rotating coordinate system). Any small amount of cross talk present is compensated by the TI.

Velocity information Angular output is available from the TI when it is used in the spinning mode with

the encoder. This angular output can be used to calculate wheel velocity. In nonspinning applications, accelerometers can be integrated into the transducer connector housing.

MTS does not supply any conditioning electronics for accelerometers. Ask your MTS consultant for more information about this option.

SWIFT 10 ATV Sensors Hardware Overview

Coordinate System

Transducer

Interface

Output signals

±10 Volts

Angular

Position

Bridge

Outputs

S10-10

Coordinate System

In the transducer, independent strain gage bridges measure forces and moments about three orthogonal axes. The signals are amplified to improve the signal-tonoise ratio. An encoder signal measures angular position, which is used to convert raw force and moment data from the rotating transducer to a vehiclebased coordinate system. The force, moment, and encoder information are sent to the transducer interface (TI).

The TI performs cross talk compensation and converts the rotating force and moment data to a vehicle coordinate system. The result is six forces and moments that are measured at the spindle: Fx, Fy, Fz, Mx, My, and Mz. A seventh (angular) output is available for tire uniformity information, angular position, or to determine wheel speed (depending on the data acquisition configuration).

Hardware Overview

SWIFT 10 ATV Sensors

Coordinate System

+Fz

+Mz

+Fx

+Fy

S10-09

Forces Acting on Rim-side of Transducer

Hub Adapter

Mounting Side

Rim Flange

Mounting Side

+Mx

+My

The coordinate system shown below was originally loaded into the TI settings by MTS. It uses the right-hand rule.

The SWIFT coordinate system is transducer-based, with the origin located at the center of the transducer. Positive loads are defined as applied to the outer ring of the transducer.

• Vertical force (Fz) is positive up.

• Lateral force (Fy) is positive out of the vehicle.

• Longitudinal force (Fx) follows the right-hand rule, consistent with Fz and

Fy described above.

You can change to the MTS Model 329 Road Simulator convention (lateral load into the vehicle is always positive) or to any coordinate system by changing the polarities in the calibration file. For instructions on how to change the coordinate system polarities, see the chapter, “Setting up the Transducer Interface”.

SWIFT 10 ATV Sensors Hardware Overview

Specifications

SWIFT 10 ATV Transducer Performance (part 1 of 2)

ARAMETER SPECIFICATION

Use

SWIFT 10 ATV (aluminum) for:

SWIFT 10 ATV (titanium) for:

Maximum usable rpm

Maximum speed

Shock resistance, each axis

Fits rim size (usable range)

Number of Lug nuts accommodated

Hub bolt circle diameter accommodate

Wheel stud size accommodated

Input voltage required

Input power required per transducer

Output voltage ± full scale calibrated load

SAE J328

Rated load capacity

Bending moment

Full scale calibrated ranges

Resolution

Performance accuracy

Nonlinearity

Hysteresis

Modulation

Cross talk

Maximum operating temperature

Assembly Weight – single wheel

Transducer

Aluminum hub adapter/spacer

Slip ring assembly

Modified aluminum rim

Lug nuts

Outer steel washer plate

Attached fasteners

Total

‡

low weight, high sensitivity, lower measured forces

1.45 kN•m (12 869 lbf•in)

Consult the calibration range sheet that accompanies each transducer

high fatigue life, longer durability, higher loads

2,200

250 kph (155 mph)

150 G

7-12 inch

All

9–30 V DC

7 Watts maximum (22 Watts typical)

†

±10 V

Aluminum

2.5 kN (550 lbf)

Titanium

4.2 kN (925 lbf)

4.76 kN•m (42117 lbf•in)

Infinite

1.0% full scale

0.50% full scale

≤5.0% reading

1.5% full scale

125°C (257°F

1.4 kg (3.0 lb)

0.5 kg (1.0 lb)

0.5 kg (1.1 lb)

2.4 kg (5.3 lb)

0.1 kg (0.2 lb)

0.2 kg (0.4 lb)

0.8 kg (1.8 lb)

5.8 kg (12.8 lb)

2.0 kg (4.5 lb)

0.5 kg (1.0 lb)

0.5 kg (1.1 lb)

2.4 kg (5.3 lb)

0.1 kg (0.2 lb)

0.2 kg (0.4 lb)

0.8 kg (1.8 lb)

6.5 kg (14.3 lb)

Hardware Overview

SWIFT 10 ATV Sensors

Specifications

SWIFT 10 ATV Transducer Performance (part 2 of 2)

ARAMETER SPECIFICATION

Output connector type

Auto shunt calibration

* Contact MTS for other rim sizes. Larger diameter rims can be used, provided that overall clearance from

brake calipers and suspension components is maintained. † Load impedance >1 k ‡ Half axle rated capacity per SAE J328.

§ Moment fatigue-rated for 100,000 cycles. # Each SWIFT sensor is calibrated on an MTS calibration machine. MTS provides complete documentation

of calibration values for each SWIFT unit ** Measured at the spindle hub.

Ω; 0.01 µF (maximum) load capacitance.

D-shell or BNC via adapter

On vehicle or laboratory test rig.

SWIFT 10 ATV Sensors Hardware Overview

Specifications

Transducer Center-of-Gravity

Transducer Center-of-Gravity and Inertia Specifications

ATERIAL

ALUMINUM TITANIUM

0.0 mm 0.000 in 0.0 mm 0.000 in

18.0 mm 0.710 in 18.0 mm 0.710 in

0.0 mm 0.000 in 0.0 mm 0.000 in

26 kg·cm29 lbm·in

50 kg·cm217 lbm·in280 kg·cm227 lbm·in

26 kg·cm29 lbm·in

42 kg·cm214 lbm·in

Transducer Interface (part 1 of 2)

ARAMETER SPECIFICATION

Physical

Height

Width

Depth

Weight

Rack Mounting Kit

28 mm (1.100 in)

213 mm (8.375 in)

171 mm (6.750 in.)

0.907 kg (30 oz)

Optional

Environmental

Ambient temperature

Relative humidity

Protection

Hardware Overview

0° C (32° F) to 50° C (122° F)

0 to 90%, non-condensing

IP64 (complete dust protection, projected water from all directions)

SWIFT 10 ATV Sensors

Transducer Interface (part 2 of 2)

ARAMETER SPECIFICATION

Power Requirements

Input voltage

Fuses

10–28 V DC

Internal thermal, self-resetting

Specifications

Power Consumption

4 Watts maximum without transducer or encoder

6 Watts typical with transducer and encoder at 12 V DC

Angular velocity

Encoder limit

Processing limit

Encoder resolution

2,200 rpm maximum

10,000 rpm maximum

2048 counts per revolution (512 pulses with quadrature)

Time delay (encoder tick to main output stable)

Transducer cable length

Analog outputs

Vol tag e

150 µs (typical)

100 ft maximum

±10 V range† (force and moment outputs) 0–5 V sawtooth (angle output)

Capacitive load

Current

Noise at output, with typical gains

0.01 µF maximum

2 mA maximum

7 mVpp, DC - 500 Hz (typical) 15 mVpp, DC - 500 Hz (maximum)

* Add 25.4 mm (1.0 in) for ground lugs. † Standard from MTS. Other full scale voltages can be evaluated and may be provided at special

request.

SWIFT 10 ATV Sensors Hardware Overview

Calibration

Each transducer is calibrated by MTS before shipment. The transducer and TI may be returned to MTS for repair and recalibration as required.

Calibration is performed at MTS on a special fixture that is capable of applying multiple loads to the transducer. During calibration, raw signals are measured. The calibration gains and cross talk compensation values are computed from this raw data. These gains are recorded in a calibration file.

A unique calibration file is supplied for each transducer. The serial number of the TI associated with the transducer is listed at the top of the calibration file. A label with the serial number of the TI box (and the SWIFT sensor with which it was originally calibrated) is attached to the back of each TI box.

The calibration file is loaded into the TI non-volatile memory by MTS before the transducer is shipped. A copy of the file is also provided on a diskette.

MTS verifies the calibration by applying loads to the transducer, measuring the main outputs and checking for accuracy. Final calibration reports are provided with each transducer.

Shunt calibration At the end of the calibration process, a shunt calibration is performed. During a

shunt calibration, a resistance is introduced into the bridge circuit. The difference between the shunted and unshunted voltage is the delta shunt reference value for each bridge. That value is saved in the calibration file, which is downloaded from a PC or laptop computer and stored in non-volatile memory in the TI.

At any time afterward, pressing the Shunt button on the front of the TI causes each of the strain gage bridges to be shunted in sequence, and the measured shunt voltage (delta shunt measured value ) is compared to the reference value.

An acceptable tolerance range is also loaded into the TI memory during system calibration. One tolerance value is used for all bridges. This value is loaded as a percentage of allowable deviation from the delta shunt values. For example, if the FX1 bridge has a shunt delta reference value of –3.93, and the tolerance is set at 2 (percent), the acceptable range for the measured value would be –3.85 to –4.01.

Hardware Overview

SWIFT 10 ATV Sensors

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