Effects of Side Load Chains of a Combine Harvester on Unbalanced Dynamic Vibrations of Its Threshing Drum

Table 1

Main performance parameters of test instruments.

Device name	Performance	Parameter value	Factory
S956Y-1 portable dynamic balancer	Frequency range (Hz)	10~5000	Beijing Sundege Technology Company
	Frequency response error (%)	±5
	Maximum range (mm/s)	100
	Highest resolution (mm/s)	0.1
L14A piezoelectric acceleration sensor	Sensitivity (pc/ms^-2)	3.5~5.2
	Frequency range (Hz)	2~3000
	Max acceleration (m/s^2)	2000
SGD-1-5V photoelectric speed sensor	Measuring range (rpm)	1~60000
	Operating voltage (Vdc)	5
	Output signal	TTL pulse signal