Project: High-Speed Motoring Test Bench for Transmission and EDU Performance Validation

1. High-Speed Drive System & Versatility

To meet the speed requirements while maintaining cost-effectiveness, we utilized a Mitsubishi MR-J4 Servo Motor system. While the motor natively supports high performance, we incorporated a dual-drive strategy:

• Direct Drive: For high-torque, lower-speed transmission testing.
• Pulley Mechanism: Utilizing V-belt drives to prevent slipping, we achieved a 1:3 ratio, boosting output speeds to 12,000 RPM.
• Inertia Optimization: We carefully calculated the load-to-inertia ratio to ensure stable control and high response times during dynamic testing cycles.

2. Dual Torque Validation (HBM & Kistler)

Calibration errors can lead to expensive test re-runs. To mitigate this risk, Ontario Dynamics pioneered a redundant sensing architecture. We integrated two torque cells of different makes:

• HBK (HBM) T40B Torque Transducer: Known for its 0.05 accuracy class and digital transmission, the T40B provided a stable, interference-immune baseline. It also features an integrated encoder for precise speed and angle measurement.
• Kistler Optical Torque Sensor: Used as a secondary verification tool to cross-reference data in real-time.
• Data Correlation: Data was collected via a National Instruments (NI) 32-channel DAQ system through an industrial computer with a high-speed contact card, ensuring that any calibration drift was immediately identified

3. Robust Mechanical Design (CNC Spindle Architecture)

The mounting unit was designed to endure significant axial thrust and provide long-term serviceability.

• Bearing Arrangement: The head unit replicates a CNC machine spindle, utilizing cylindrical roller bearings for radial loads and angular contact ball bearings for axial thrust.
• Modular Interface: A precision-engineered modular faceplate allows for rapid switching between different unit types, drastically reducing setup time for diverse testing batches.

4. Integrated Data Acquisition & Sensor Suite

The 32-channel NI DAQ provides a holistic view of the unit under test (UUT), capturing:

• Cylinder Pressure: Using high-precision Kistler integrated pressure and temperature sensors.
• Lubricant Health: Monitoring oil temperature via Omron sensors and high-accuracy Keyence temperature probes.
• Vibration Analysis: Supporting multiple three-axis accelerometers to monitor NVH (Noise, Vibration, and Harshness).
• Signal Integrity: We optimized the response time by implementing digital filtering techniques that eliminate electronic noise without “over-correcting,” preserving the fidelity of high-frequency data.