MA Ji jie1, CHENG Guang ming1*, CHEN Sheng hui1, LU Pin2, 

WANG Xue wu2, WANG Jing hong2

 

(1. Institute of Precision Machinery, Zhengjiang Normal University, Jinhua 321004, China;

 

2. Jinhua Product Quality Supervision and Inspection Institute, Jinhua 321001, China)

 

 

Abstract: In order to reduce the inertia measuring error in the traditional falling body method arisen from the constant resistance torque elimination, resistance torque function in terms of various resistances was applied to the falling body method. By analyzing the resistances in the falling body inertia measuring apparatus, a new falling body method using the actively built equivalent speed and load to eliminate the resistance torque was proposed. A new falling body inertia measuring apparatus was designed independently to verify the new method. Experiment was also conducted on this apparatus. The results indicate that the repeated test of 3 inertia disks can give a maximum measuring error of less than 5%, and that the influences of the resistances could be well reduced by creating equivalent impact factors in the two falling process and consequently improve the repeatability and precision of the falling body method.

 

Key words: inertia measurement; falling body method; resistance torque; speed and load