Strain Gage Based Transducers Wheel Force Transducer

Transcription

Measurement Engineering Products and Services
Michigan Scientific Corporation
1
Charlevoix
Milford
2
Company Profile
• Incorporated in 1960
• Manufacturer of measurement equipment
- Slip ring assemblies
- Telemetry
- Strain gaged based transducers (standard and custom)
- Signal conditioning electronics
• Provider of engineering services
- Data acquisition and analysis
- Failure analysis
- FEM and dynamic computer simulation
- Product (re)design
3
Instrumentation Slip Ring Assemblies
SLIP RING
SLIP RING
OVER-SHAFT
APPLICATION
EXAMPLE
END-OF-SHAFT
APPLICATION
EXAMPLE
MANY OPTIONS INCLUDING:
• End-of-shaft and over-shaft (thru-bore) types
• Solder terminals and/or connectors
• Built-in encoders, F-V electronics, strain gage & TC amplifiers
• Weatherproof
• Custom builds
4
Some end-of-shaft types (many sizes and ring counts available)
This model has
built-in encoder &
F-V electronics
This model has
a strain gage
amp built-in to
the rotor
All models feature:
• Instrumentation quality rings and brushes
• Permanently lubricated bearings
• Rugged construction
5
Some over-shaft types (many sizes and ring counts available)
This model has a
60 ppr encoder
and built-in
spinning
amplifier
All models feature:
• Instrumentation quality rings and brushes
• Permanently lubricated bearings
• Rugged construction
6
End-of-Shaft & Over-Shaft Application Examples
In these examples the customer provided standard parts to MSC. MSC
designed & machined custom transducer elements as needed, applied
strain gages, performed temperature compensation, calibration,
crosstalk-check, assembly, and environmental protection.
7
Automotive Half Shaft Slip Ring Assemblies
• Weatherproof system
• Optional built-in strain gage amplifier
• Optional 60 pulse/rev encoder
MICHIGAN SCIENTIFIC CAN TAKE YOUR PRODUCTION SHAFT,
STRAIN GAGE, CALIBRATE, MOUNT SLIP RING, AND RETURN COMPLETE
WEATHERPROOF ASSEMBLY READY TO INSTALL IN YOUR VEHICLE.
8
Strain Gage & Thermocouple Modular “Hockey Puck
Style” Spinning Amplifiers
These models are designed to “stack-on” most MSC end-of-shaft slip
ring rotors. Locates amplifier close to the spinning sensor for improved
signal quality. Particularly beneficial for noisy environments.
1-ch Strain Gage Amp
3-ch TC Amp
STRAIN GAGE AMP
• Very stable bridge excitation voltage
• Adjustable gain and shunt-cal resistor
• Remote shunt-cal and bridge-excitation-kill control
TC AMP
• Thermocouple models available with 2 or 3 channels (all TC types available)
• Built-in cold junction compensation
• Eliminates potential error associated with inserting slip ring within TC circuit
9
Strain Gage & Thermocouple Spinning Amplifiers
Amplifier Power and Control Box
A single “Amplifier Power Unit”…
… operates various models of MSC
“Spinning Amp’s”
• One box can power and control 20+ amplifiers
• 12 VDC and 120 VAC powered types
• Remote shunt-cal and bridge-excitation-kill control
• Use with any MSC spinning amplifier
10
Custom Design & Build of Slip Ring & Signal Conditioning
Automatic transmission
turbine shaft slip ring
Automatic
transmission
pancake
slipring
Rail wheel spinning
amp package
Strain
gaged
crankshaft
with
spinning
amps
6-ch 1/4 arm strain gage
spinning amp package Michigan Scientific Corporation
11
Telemetry
Non-contact digital systems
• For strain and TC sensors
• Up to 3 channels per transmitter
• Battery or induction powered
• “AutoTune” induction feature
• Up to 1 kHz bandwidth
• Automatic shunt calibration and bridge-kill check on power-up
12
Telemetry Hardware & Applications
Automotive flexplate torque transducer
POWER
REGULATOR
STRAIN GAGED
BEAMS
TRANSMITTER
AND AMPLIFIER
SECONDARY POWER
INDUCTION COIL
• Measures high frequency dynamic engine torque input to transmission
• Induction powered (no battery) – with “Auto-Tune” feature
• Customer’s flexplate is custom engineered to accurately measure torque
• Complete build-up and balance by MSC - we ship ready to install
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Telemetry data from Flexplate Transducer
High Bandwidth Torque Data shows individual cylinder firing
Engine Torque (lbft)
Both High and Low Bandwidth Data signals are
available for simultaneous recording.
Low Bandwidth Data
provides average torque output
Once Per Revolution Pulse from crank shaft position sensor
Time (seconds)
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Automotive propshaft transducer
RECEIVING
ANTENNA
SECONDARY
INDUCTION
COIL
STRAIN
GAGED TUBE
TRANSMITTER
(POWER REG
ON FAR SIDE)
PRIMARY
INDUCTION
COIL
RECEIVING
ANTENNA
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Motorsports propshaft transducer
(internally mounted electronics & gages)
TELEMETRY
ELECTRONICS
LOCATED
INSIDE TUBE
STRAIN GAGE
TORQUE
TRANSDUCER
SECONDARY
INDUCTION
COIL
ANTENNA
TRANSMITTER
POWER
REGULATOR
SECONDARY
INDUCTION
COIL
PRIMARY
INDUCTION
COIL
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Halfshaft torque transducer
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Halfshaft torque transducer
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Strain Gage Based Transducers
Standard Three-Directional Load Cells
GAGED: standard 3-Directional Load Cells
• For 3-D force measurement at component interfaces
• Mount in tandem to calculate roll, pitch, and yaw moments
• Capacities from 250 lbs (1110 N) to 100,000 lbs (444,000 N)
19
Pedal Force Transducers (round & low-profile-rectangular)
• 500 lb (2200 N) capacity
• High accuracy even with off-center loading
• Fits standard brake and parking-brake pedals
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Strut-to-Knuckle Force/Moment Transducer
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Strain Gage Based Transducer Display Module
•
•
•
•
•
Precision low noise differential amplifier
Adjustable gain and zero
Display engineering units direct
High level analog output (20 kHz @ -3 dB)
Peak detect/hold feature
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Wheel Torque Transducer – SLIP RING or TELEMETRY
Wheel torque
transducer element
Complete assembly with
slip ring, thermocouples,
and spinning amp
Telemetry option
(battery powered)
• Available in various capacities and sizes (13” and larger)
• MSC can make your custom wheel and hub adapters
• High resolution models available
• Environmentally protected & temperature compensated
• Add up to 2 thermocouple channels (slip ring or telemetry)
23
Wheel Force Transducers (6-axis) – SLIP RING OPTION
A.T.V.
Passenger car and truck
Heavy truck (single and dual wheels)
• Measures 3 forces and 3 moments
• Low crosstalk
• Environmentally protected and temperature compensated
• Mates to same wheel and hub adapters as MSC Wheel Torque Transducers
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Wheel Force Transducer – Passenger Car & Truck Hardware
Electrical
Connectors to
Amp Assembly
HUB ADAPTER
WHEEL ADAPTER
TRANSDUCER INSTALLED
SLIP RING & SPINNING
AMPLIFIERS ASSEMBLY
COMPLETE ASSEMBLY
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Wheel Force Transducer CT2 Interface Electronics – SLIP RING
• Analog, CAN and Ethernet outputs
• On-the-fly coordinate transformation
• Automated zeroing and shunt-cal features with fault alert
• Bridge power kill for noise check
• Ethernet communication via laptop or PDA and web browser
• One box per transducer (stackable)
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Wheel Force Transducer CT2 Interface Electronics – SLIP RING
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Wheel Force Transducer – TELEMETRY OPTION
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Wheel Force Transducer CT2 Interface Electronics – TELEMETRY
• Analog, CAN and Ethernet outputs
• On-the-fly coordinate transformation
• Automated zeroing and shunt-cal features with fault alert
• Bridge power kill for noise check
• Ethernet communication via laptop or PDA and web browser
• One box per transducer (stackable)
• Integrated induction power electronics with “AutoTune”
29
Wheel Force Transducer CT2 Interface Electronics – TELEMETRY
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Wheel Force Transducer CT2 Interface Electronics – WEB PAGE
• Ethernet Cable to Computer
LAN Connection
• Web Browser Enabled
• Allows user full control over
CT2 User selectable Settings
• Views Transducer Information
• Configure CAN bus and obtain
CAN database file (.dbc)
• View Static Values
31
Wheel Force Transducer Usage Examples
Vehicle rollover potential
Traction studies
Road to lab correlation
Brake development & testing
Suspension forces
Suspension durability lab testing
Tire wear
etc…etc...
32
Wheel Force Transducer Data
…
Suburban Right Front Wheel Loads
Pothole at 25 MPH
5000
70
4500
4000
60
3500
50
Fx
Longitudinal
(lb)
2500
2000
40
1500
1000
30
Speed (mph)
Output (lb. or lb-ft)
3000
Fz Vertical
(lb)
Radial Force
Magnitude
(lb.)
500
0
-500
20
2.3
2.4
2.5
2.6
-1000
2.7
Speed (.044
sec avg)
(MPH)
2.8
10
-1500
-2000
0
Time (sec)
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Wheel Force Transducer Data
2200
60
2000
55
1800
50
1600
45
1400
40
1200
35
1000
30
800
25
600
20
400
15
200
10
0
Fvx
Longitudinal
(lb.)
Speed (MPH)
Force (lb.) or Torque (lb-ft)
Right Front Wheel Loads Recorded on Suburban at Milford
Severe Braking with Transition from Dry Surface to Wet Tile Surface
Fvy Lateral
(lb.)
Fvz Vertical
(lb.)
Speed (mph)
B12 RF
Resolver
Sine
5
-200
0
0
0.5
1
1.5
2
2.5
3
3.5
4
Time (sec.)
34
Wheel Force Transducer
35
Motorcycle with Wheel Force Transducer
WFT
• Telemetry (no slip rings)
• Measures 3 forces, 3 moments, wheel position and speed
• On-the-fly Coordinate Transformation and crosstalk compensation
• Michigan Scientific can make custom front & rear wheel and hub adapters
36
Strain Gage & TC Services
Examples of custom strain gage & TC transducers from a variety of
prototype & production components.
37
Powertrain Torque Measurements
Michigan Scientific can provide transducer systems to
measure the various powertrain torques shown.
tire
AXLE
TORQUE
WHEEL
TORQUE
wheel
WHEEL
TORQUE
tire
brake,
bearing,
seals
FLEXPLATE OR CLUTCH
TORQUE
pulley
wheel
tire
tire
brake,
bearing,
seals
AXLE
TORQUE
transmission
CRANK PULLEY
TORQUE
DRIVESHAFT TORQUE
CRANKSHAFT
TORQUE
TORQUES OF VARIOUS
TRANS. ELEMENTS
(e.g. input shaft, clutches,
sprockets, output shaft…)
38
Full Service On-Site Data Acquisition
39
Engineering Services example
Brake Development for Subway Commuter Car
Brake parameters measured include:
• Torques
• Temperatures
• Strains
• Vibrations
• Speed
Actual and Emergency service
conditions
Vibration, Fatigue, Thermal,
and Track Interface analyzed
40
Engineering Services example: Wind Turbines
MSC has provided various
Wind turbine manufacturers with
test equipment and services.
Shaft Torques and Gear Tooth Strains have
been measured.
41
Fiber-Optic Signal Links
Electromagnetic Compatibility (EMC) engineering and testing of
component and full-vehicle: transmit signals over fiber-optic
cables, into and out of strong electromagnetic fields
• RF IMMUNE
• STABLE
• LONG BATTERY LIFE
BI-DIRECTIONAL: battery powered transmitter
and receiver are both EMI / RFI Hardened
Rack Mount or Bench Top, 2 – 12 channel
receiver configurations available
42
Fiber-Optic Signal Links
Popular module types
Analog
DC – 20kHz, DC – 1MHz,
or DC – 8MHz (for Video signals)
Audio
20 – 20kHz
Position
0 – 32” linear displacement
Remote Power Relay
four 5A, or one 30A latching SPST
43
Frequency to Voltage Electronics
Velocity (frequency) and Position (pulse count)
from most types of Encoder and Mag-pickup signals.
• 4 Single-phase (or 2-pair Quadrature) pulse inputs, with up to ± 120V range
• Input frequency range of 0.150 Hz to 120 kHz
• Additional analog input, allows easy calibration to external speed reference
• 4 FAST outputs, updated on every period of the input signals
• Outputs are 16-bit with ± 10V range
• Configured via USB cable and Windows compatible software
44
Volumetrics™
Acoustical method for measuring cavity volume.
Specifically designed to determine engine compression ratios.
• Measures compression volume
• Measures TOTAL volume
• Use to locate top dead center
• Temperature compensated
• Portable
• Requires shop air and 110 or 240 VAC
45
Summary of Engineering Services
Custom strain gage based transducer design and build
Data acquisition, analysis, documentation
Fatigue analysis
Failure analysis
Product redesign
Finite Element Modeling (FEM)
Dynamic computer simulation
46
These slides can be downloaded in pdf format
from our website:
www.michsci.com
Charlevoix
(231) 547-5511
Milford
(248) 685-3000
- THANK YOU Michigan Scientific Corporation
48

Strain Gage Based Transducers Wheel Force Transducer

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