Study on Preload of Bolted Connections in Pitch Bearing Based on Vibration Modal Analysis

Table 1

Experimental instrument parameters.

Name	Model	Range	Error/calibration value
Bolt	M10 × 55 GB/T152.4-1988	0∼60 N·m	—
Accelerometer	INV9824	0∼40 kHz	0.525 mV/ms^−2
Torque wrench	Electronic digital display	2∼60 N·m	±5%
Data acquisition instrument	INV 3018	0∼102.4 kHz	—
Force hammer	INV9310	0∼500 N	9.97 mV/N