GB/T 34378-2017 in English

Static unbalance calculation example

A motorcycle tire, mass m=10kg, center of gravity eccentricity e=0.5cm, speed n=600r/min.

According to the formula:

U_s = m × e × (πn / 30)² × 10^-5

Calculation: U_s ≈ 3.14 g·cm.

Dynamic unbalance analysis

Measurement results of a testing machine: couple unbalance M=0.5 N·m, key position angle α=1.5°.

According to the formula:

M = (I_a - I_d) × sinα × (πn / 30)² × 10^-7

The calculated results are highly consistent with the actual measured values, indicating that the equipment accuracy meets the requirements.

Test Equipment Calibration

• Regularly use the weights specified in GB/T25158 to calibrate the test machine to ensure measurement accuracy.
• The speed range is controlled at 200~800r/min to ensure the reliability of the measurement results.

Test environment optimization

• Control the test site temperature between 5~40℃ to avoid extreme temperature affecting the measurement results.
• Stay away from vibration sources and reduce external interference factors.

Data recording and analysis

• Record static unbalance, couple unbalance and key position angle parameters in strict accordance with standard requirements.
• Establish a data analysis system, compile long-term test data and optimize tire production technology.