Quickly bookmark! Sharing solutions to common malfunctions of electronic dynamic fatigue testing machines

The electronic dynamic fatigue testing machine is a device used for testing the fatigue performance of materials or components under cyclic loading, and is widely applied in aerospace, automotive manufacturing, and biomedical fields. Its core value lies in simulating actual service conditions and evaluating fatigue life through precise control of load waveform and frequency. During use, issues that may affect test results may arise due to mechanical or electrical factors. It is crucial to understand common problems and their solutions. The following is a detailed introduction to common problems and corresponding solutions in the use of electronic dynamic fatigue testing machines.

1. Load waveform distortion or overshoot

A common phenomenon is a significant deviation between the actual load and the set waveform. This may be due to improper PID parameters, excessive friction in the actuator, or interference with the sensor signal. Solutions include resetting the PID parameters, cleaning the actuator and adding lubricating oil, and checking the grounding of the shielded wire.

2. Unstable displacement or load control

Possible causes include blockage of the servo valve, contamination of the hydraulic oil, or looseness of the feedback sensor. Solutions: clean the servo valve; replace the hydraulic oil; tighten the sensor connection.

3. The frequency cannot reach the set value

This issue is commonly encountered due to insufficient power supply, mechanical resonance, or program limitations. Solutions include installing a regulated power supply, adjusting the rigidity of the test specimen to avoid the resonance region, and reducing the test frequency.

4. Abnormal shutdown during testing

Possible causes include overload protection activation, motor overheating, or limit switch activation. Solutions: check if the load exceeds the limit; clean the motor fan; reset the travel limit.

5. Data acquisition anomalies (such as breakpoints, glitches)

Possible reasons may include encoder contamination, loose connecting wires, or a mismatch in sampling frequency. Solutions include cleaning the encoder with anhydrous ethanol, replugging the data cable, and adjusting the sampling frequency.

6. Impact of ambient temperature

High temperature leads to a decrease in oil viscosity, while low temperature results in poor lubrication. Solutions include installing an oil cooler or heater, and selecting hydraulic oil with a wide temperature range.

7. Software communication interruption

Possible reasons may include an excessively long USB cable, driver conflicts, or insufficient system resources. Solutions: Use a USB cable with a magnetic ring; disable antivirus software; and restart the computer.