MTS SWIFT 50 User Manual
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SWIFT® 50 GLP Sensor
Product Information
Spinning Wheel Integrated Force Transducer
For Medium and Heavy Trucks
100-162-722 E
Copyright information © 20012 MTS Systems Corporation. All rights reserved.
Trademark information MTS, SWIFT, T estStar, TestWare, MTS Remote Parameter Control, and RPC are
registered trademarks of MTS Systems Corporation within the United States.
These trademarks may be protected in other countries.
All other trademarks or service marks are property of their respective owners.
Proprietary information Software use and license is governed by MTS’s End User License Agreement
which defines all rights retained by MTS and granted to the End User. All
Software is proprietary, confidential, and owned by MTS Systems Corporation
and cannot be copied, reproduced, disassembled, decompiled, reverse
engineered, or distributed without express written consent of MTS.
Software validation and
verification
Publication information
MTS software is developed using established quality practices in accordance
with the requirements detailed in the ISO 9001 quality standards. Because MTSauthored software is delivered in binary format, it is not user accessible. This
software will not change over time. Many releases are written to be backwards
compatible, creating another form of verification.
The status and validity of MTS’s operating software is also checked during
system verification and routine calibration of MTS hardware. These controlled
calibration processes compare the final test results after statistical analysis
against the predicted response of the calibration standards. With these established
methods, MTS assures its customers that MTS products meet MTS’s exacting
quality standards when initially installed and will continue to perform as intended
over time.
Manual Part Number Publication Date
100-162-722 A March 2006
100-162-722 B April 2006
100-162-722 C January 2007
100-162-722 D January 2009
100-162-722 E June 2012
Contents
Technical Support 5
How to Get Technical Support 5
Before You Contact MTS 5
If You Contact MTS by Phone 7
Problem Submittal Form in MTS Manuals 8
Preface 9
Before You Begin 9
Conventions 10
Documentation Conventions 10
Hardware Overview 13
Overview 14
Spinning Applications (Track or Road) 16
Non-spinning Applications (Laboratory) 17
Construction 18
Design Features 21
Coordinate System 22
Specifications 24
Calibration 26
Interfacing with RPC 27
Installation 29
Hazard Icons 30
Road and Track Vehicles 31
Attaching SWIFT Components to the Vehicle 36
Attaching SWIFT and Wheel Assembly to the Vehicle 40
Attaching SWIFT Components to the Fixturing 48
Analyzing SWIFT Data 53
The Data 54
SWIFT 50 GLP Sensors
3
Fx Data (Longitudinal Force) 55
Fz Data (Vertical Force) 57
Mx Data (Overturning Moment) 58
My Data (Brake Moment) 61
Acceleration and Braking Events Example 63
Slalom Curve Driving Example 65
Maintenance 67
Transducer 68
Cables 69
Troubleshooting 71
Assembly Drawings 83
Cable Drawings 84
SWIFT 50 GLP Mechanical Drawings 95
4
SWIFT 50 GLP Sensors
Technical Support
How to Get Technical Support
Start with your
manuals
Technical support
methods
The manuals supplied by MTS provide most of the information you need to use
and maintain your equipment. If your equipment includes software, look for
online help and README files that contain additional product inform ation.
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 Technical Support in
one of the following ways.
www.mts.com The web site provides access to our technical support staff by means of an online
form:
www.mts.com > Contact MTS > Service & Technical Support button
E-mail tech.support@mts.com
Telephone MTS Call Center 800-328-2255
Weekdays 7:00 A.M. to 5:00 P.M., Central Time
Fax 952-937-4515
Please include “Technical Support” in the subject line.
Outside the U.S. 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 50 GLP Sensors Technical Support
The site number contains your company number and identifies your equipment
type (such as material testing or simulation). The number is typically written on a
label on your equipment before the system leaves MTS. If you do not know your
MTS site number, contact your sales engineer.
Example site number: 571167
When you have more than one MTS system, the system job number identifies
your system. You can find your job number in your order pape rwork.
Example system number: US1.42460
5
Know information from
prior technical
If you have contacted MTS about this problem before, we can recall your file
based on the:
assistance
• MTS notification number
• Name of the person who helped you
Identify the problem Describe the problem and know the answers to the following questions:
• How long and how often has the problem occurred?
• Can you reproduce the problem?
• Were any hardware or software changes made to the system before the
problem started?
• What are the equipment model numbers?
• What is the controller model (if applicable)?
• What is the system configuration?
Know relevant
computer information
Know relevant
software information
For 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 where 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 can typically be found
in the About selection in the Help menu.
• The names of other applications on your computer, such as:
– Anti-virus software
– Screen savers
– Keyboard enhancers
– Print spoolers
Technical Support
6
– Messaging applications
SWIFT 50 GLP Sensors
If You Contact MTS by Phone
A Call Center agent registers your call before connecting you with a technical
support specialist. The agent asks you for your:
• Site number
• Name
• Company name
• Company address
• Phone number where you can be reached
If your issue has a notification number, please provide that number. A new issue
will be assigned a unique notification number.
Identify system type To enable the Call Center agent to connect you with the most qualified technical
support specialist available, identify your system as one of the following types:
• Electromechanical material test system
• Hydromechanical material test system
• Vehicle test system
• Vehicle component 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 for your
• Aero test system
Prepare to perform troubleshooting while on the phone:
• Call from a telephone close to the system so that you can implement
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.
In case Technical Support must call you:
• Verify the notification number.
• Record the name of the person who helped you.
• Write down any specific instructions.
problem or request. If you have questions about the status of your problem or
have additional information to report, please contact Technical Support again and
provide your original notification number.
SWIFT 50 GLP Sensors Technical Support
7
Problem Submittal Form in MTS Manuals
Use the Problem Submittal Form to communicate problems with your software,
hardware, manuals, or service that are not resolved to your satisfaction through
the technical support process. The 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 respon se—your feedback is important to
us.
Access the Problem Submittal Form:
• In the back of many MTS manuals (postage paid form to be mailed to MTS)
• www.mts.com > Contact Us > Problem Submittal Form button (electronic
form to be e-mailed to MTS)
Technical Support
8
SWIFT 50 GLP Sensors
Before You Begin
Preface
Before You Begin
Safety first! Before you 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 can result in hazardous conditions that can
cause severe personal injury or death, or 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 manuals in paper or
electronic form.
You may also receive an MTS System Documentation CD. It contains an
electronic copy of the manuals that pertain to your test system, such as:
• Hydraulic and mechanical component manuals
• Assembly drawings
• Parts lists
• Operation manual
• Preventive maintenance manual
Controller and application software manuals are typically included on the
software CD distribution disc(s).
Model 505G2.60 - 505G2.180 SilentFlo™ HPU Preface
9
Conventions
DANGER
WARNING
CAUTION
Conventions
Documentation Conventions
The following paragraphs describe some of the conventions that are used in your
MTS manuals.
Hazard conventions Hazard notices may be embedded in this manual. These notices contain safety
information that is specific to the activity 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 all directions and recommendations.
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 or equipment damage,
or could 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. They are examples only and do
Electronic manual
conventions
Preface
10
not necessarily represent your actual system configuration, test application, or
software.
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.
Model 505G2.60 - 505G2.180 SilentFlo™ HPU
Documentation 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.
Model 505G2.60 - 505G2.180 SilentFlo™ HPU Preface
11
Documentation Conventions
12
Preface
Model 505G2.60 - 505G2.180 SilentFlo™ HPU
Hardware Overview
Contents Overview 14
Spinning Applications (Track or Road) 16
Non-spinning Applications (Laboratory) 17
Construction 18
Design Features 21
Coordinate System 22
Specifications 24
Calibration 26
Interfacing with RPC 27
SWIFT 50 GLP Sensors Hardware Overview
13
Overview
Data
S50-001
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.
Parts Replacement,
Disassembly, and Care
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.
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 71.
Hardware Overview
14
SWIFT 50 GLP Sensors
Overview
CAUTION
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 67, 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 bumped into 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, as listed in
“Specifications” on page 24.
• Be used if the integrity of the sealed cover has been compromised or the
warning labels removed.
• Be used if the sensor assembly shows indications of damage (such as dents,
bent slip ring bracket arms, a bent anti-rotate assembly, etc.).
• Be used if any part of the assembly has been modified without explicit,
written authorization from MTS.
SWIFT 50 GLP Sensors Hardware Overview
15
Spinning Applications (Track or Road)
Customer Supplied
Power Supply
Customer Supplied
Data Recorder
Transducer Interface
(TI)
Transducer Signals
Output
Signals
S50-002
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), customer supplied power supply, and data recorder can be located
inside the vehicle or in the trunk.
Note For track applications, the power supply is usually the vehicle’s power
system or an auxiliary battery.
Spinning Application (Track or Road)
Hardware Overview
16
SWIFT 50 GLP Sensors
Non-spinning Applications (Laboratory)
Power Supply (with 4
connections)
Customer-Supplied
Test Control System
Transducer Interface
(TI)
Transducer Signals
Output
Signals
PC Communication
S50-003
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.
Four of the six loads measured by the transducer directly correlate to the MTS
Model 329 Road Simulator inputs: vertical force, longitudinal force, lateral force,
and braking input.
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, a
titanium SWIFT sensor can be used for iterations within the RPC process. The
titanium 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 durabilit y tests, we suggest using the
stainless steel 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 50 GLP Sensors Hardware Overview
17
Construction
Slip Ring
Bracket
(with encoder)
Lug Nuts and
Shim Washers (10)
Spindle Adapter
Spacer
Transducer
Modified
Wheel Rim
(front wheel)
S50-008
Spacer-to-Transducer
Fasteners
Rim-to-Transducer
Assembly Fasteners
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.
Transducer The transducer attaches directly to a modified wheel rim. On the test track
vehicle, it spins with the wheel. It does not spin on a road simulator. The
transducer is available in two materials: titanium, for spinning applications,
where the priority is light weight, and stainless steel, for non-spinning
applications, where the priority is maximum load capacity and durability.
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.
Hardware Overview
18
SWIFT 50 GLP Sensors
Construction
Dual Rim Configuration Front Rim Configuration
Slip Ring
Slip Ring
Anti-Rotate
Assembly
Anti-Rotate
Assembly
SWIFT 50
Transducer
SWIFT 50
Transducer
Tire Tire
Tire
Spindle
Adapter
Spacer
Spindle
Adapter
Spacer
Anti-Rotate
Mounting Bracket
(customer supplied)
Anti-Rotate
Mounting Bracket
(customer supplied)
Slip-Ring
Bracket
Slip Ring
Bracket
Transducer
Interface
Cable
Transducer
Interface
Cable
S50-004a
Slip-Ring
Extension
Bracket
(Component configuration is typical. Your specific
configuration might vary slightly.)
Spindle adapter spacer The spindle adapter spacer attaches to the inner diameter of the transducer,
allowing you to place it at the original position of the spindle face of the vehicle.
The spindle adapter spacer 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. In addition, the spindle adapter spacer helps
minimize brake heat from being transferred to the transducer.
Components Set Up for Test Track
Slip-ring bracket The slip-ring bracket is used to attach 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
uses an optical encoder, integrated into the slip ring assembly, that counts off
“ticks” to measure the angular position as the wheel rotates. It measures 2048
(512 plus quadrature) points per revolution (ppr) with a resolution of 0.18
Slip ring The slip ring allows you to output the transducer bridge signals and angular
SWIFT 50 GLP Sensors Hardware Overview
Anti-rotate device The anti-rotate device is attached to the slip ring and the vehicle’ s suspension (or
degrees and an accuracy of 0.18 degrees.
position to the TI. A transducer data cable attaches from the slip ring to the back
panel of the TI. The slip ring is not used for non-spinning applications.
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 optical encoder. Its
secondary function is to prevent the cable from rotating with the wheel and
becoming tangled or breaking.
19
Construction
The anti-rotate device is mainly used 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 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.
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 conditions the power supply, and uses previously stored calibration values
to convert the eight bridge outputs and the encoder signal to six non-rotating
analog outputs (Fx, Fy, Fz, Mx, My, Mz) plus 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 shunt
and 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 or
24 V DC power converter for use in the test laboratory.
Hardware Overview
20
SWIFT 50 GLP Sensors
Design Features
Flexure isolation The SWIFT sensor has a very stiff outer ring and flexured beam isolation which
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.
Thermal stability The entire sensor is machined from a solid, specially forged billet of high
strength stainless steel or titanium. The absence of bolted joints permits an
efficient transfer of heat across the sensor structure, minimizing temperature
differentials in the gaged area.
As mentioned earlier, flexure isolation allows thermal expansion with minimal
stresses.
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.
Construction
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. The
mini TI can have an analog output configured to be proportional to angular
velocity.
In non-spinning applications, accelerometers can be integrated into the
transducer connector housing. However, the SWIFT conditioning circuitry does
not support accelerometers; external conditioners must be used. Contact MTS for
additional information.
SWIFT 50 GLP Sensors Hardware Overview
21
Coordinate System
Fx
Fy
Fz
Mz
Mx
My
Transducer
Interface
Output signals
±10 Volts
Angular
Position
Bridge
Outputs
S50-010
+Fz
+Mz
+Fx
+Fy
S50-009
Forces Acting on Rim-side of Transducer
Hub Adapter
Mounting Side
Rim Flange
Mounting Side
+Mx
+My
Coordinate System
In the transducer, independent strain gage bridges measure forces and moments
about three orthogonal axes. The signals are amplified to reduce the signal-tonoise ratio. An encoder signal indicates angular position, which is used to
convert raw force and moment data from the rotating transducer to a vehiclebased coordinate system. The force and moment and encoder information is 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).
The coordinate system shown below was originally loaded into the TI settings by
MTS. It uses the right-hand rule.
Hardware Overview
22
SWIFT 50 GLP Sensors
Coordinate System
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) is positive out of the transducer
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 50 GLP Sensors Hardware Overview
23
Specifications
Specifications
SWIFT 50 GLP Transducer Performance (part 1 of 2)
Parameter Specification
Use
SWIFT 50 GLP S (stainless steel) for
SWIFT 50 GLP T (titanium) for
Maximum usable rpm
Maximum speed
Fits rim size (usable range)
Maximum hub bolt circle diameter
accommodates M22 studs
Input voltage required (mini TI)
Input power required (mini TI)
Output voltage ± full scale calibrated load
SAE J267
Rated load capacity
Bending moment
Full scale calibrated ranges#
Longitudinal force (Fx)
Lateral force range (Fy)
Vertical force range (Fz)
Overturning moment (Mx)
Driving/braking moment (My)
Steering moment (Mz)
Resolution (analog system)
Noise level (peak-to-peak 0-500 Hz)
Performance accuracy
Nonlinearity
Hysteresis
Modulation**
Cross talk
††
‡
§
high fatigue life, durability
low weight, high sensitivity
2,200
200 kph (125 mph)
22.5–24.5 inch
*
335 mm (13.189 in)
10–28 V DC
8 W maximum (6 W typical)
†
±10 V
Stainless SteelTitanium
64.50 kN (14,500 lbf)44.48 kN (10,000 lbf)
55.8 kN•m (494,075 lbf•in)38.5 kN•m (340,740 lbf•in)
±220 kN (±49,458 lbf) ±150 kN (±33,721 lbf)
±100 kN (±22,481 lbf) ±60 kN (±13,489 lbf)
±220 kN (±49,458 lbf) 150 kN (±33,721 lbf)
±50 kN•m (±442,537 lbf•in) ±37 kN•m (±327,478 lbf•in)
±50 kN•m (±442,537 lbf•in) ±40 kN•m (±354,030 lbf•in)
±50 kN•m (±442,537 lbf•in) ±37 kN•m (±327,478 lbf•in)
Infinite
40 N (9.0 lbf) 30 N (6.7 lbf)
1.0% full scale
0.75% full scale
≤5.0% reading
1.5% full scale
Hardware Overview
24
SWIFT 50 GLP Sensors
SWIFT 50 GLP Transducer Performance (part 2 of 2)
Parameter Specification
Maximum operating temperature
Specifications
Low level amplifiers
Transducer interface
* 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 267.
§ Seen on the transducer for 100,000 cycles.
# The actual calibrated range may be different based on individual customer requirements. Consult the
calibration range sheet that accompanies each transducer for the correct calibration range.
** Typical value on most steel rims. Stainless steel rims typically have slightly higher modulation, but at a
lower added weight.
†† Each SWIFT sensor is calibrated on an MTS calibration machine. MTS provides complete documentation
of calibration values for each SWIFT unit. Unique calibration values are stored electronicall y and
transferred to the transducer interface unit (TI box) shipped with each SWIFT 50.
Ω; 0.01 µF (maximum) load capacitance.
70°C (158°F)
50°C (122°F)
SWIFT 50 GLP Sensors Hardware Overview
25
Calibration
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 RAM 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 Shunt calibration information can be found in the SWIFT
Interface product manual, part number 100-214-316.
®
Mini Transducer
Hardware Overview
26
SWIFT 50 GLP Sensors
Interfacing with RPC
The SWIFT sensor is directly compatible with the MTS Remote Parameter
Control (RPC) simulation software. The SWIFT system produces outputs that
directly correspond to the uncoupled spindle forces that the MTS Model 329
Road Simulator applies to the vehicle. Traditional instrumentation techniques
provide coupled suspension loads data. Using the SWIFT sensor, the RPC
simulation software needs to apply less correction to obtain the road simulator
drive signals. Fewer iterations are required to recreate the measured loads.
You must ensure that the full scale value for your data recorder and the MTS
electronics match. MTS electronics are typically set at ±10 V full scale, while
some data recorders are ±5 V full scale.
The SWIFT sensor is calibrated for ±10 V full scale. T o recompute the TI gains
for ±5 V full scale, a verification pass must be run or the calibration will not be
traceable. Upon special request, MTS can evaluate and may provide calibration
for ±5 V or other full scale voltages.
Interfacing with RPC
SWIFT 50 GLP Sensors Hardware Overview
27
Interfacing with RPC
Hardware Overview
28
SWIFT 50 GLP Sensors
Installation
Contents Hazard Icons 30
The SWIFT sensor can be installed on a vehicle at the test track or on an MTS
Series 329 Road Simulator in the test laboratory.
Road and Track Vehicles 31
Attaching SWIFT Components to the Vehicle 36
Attaching SWIFT Components to the Fixturing 48
SWIFT 50 GLP Sensors Installation
29
Hazard Icons
Hazard Icons
Read, understand, and
follow the instructions
in the manual
The following hazard icon is part of the label affixed to the side of the SWIFT 50
GLP Sensor.
30
Installation
SWIFT 50 GLP Sensors
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