. Author manuscript; available in PMC: 2015 Sep 8.

Published in final edited form as: Int J Heavy Veh Syst. 2014 Jul;21(3):241–261. doi: 10.1504/IJHVS.2014.066080

Table 7.

Results of regression results for VDV vibration and transmissibility for haul trucks

	VDV X-axis (chassis)	VDV Y-axis (chassis)	VDV Z-axis (chassis)	VDV X-axis (seat)	VDV Y-axis (seat)	VDV Z-axis (seat)	VDV total (seat)	VDV transmissibility
Constant	1.3900	1.467	1.0626	2.2361	4.1378^**	5.6875^**	8.6892^***	2.4269^***
Loaded vs. unloaded	–0.3081^***	–0.2291^***	–0.2764^**	–0.3203^***	–0.4038^***	0.1978	–0.5063^***	0.1029^***
Speed (mph)	0.0380^***	0.0578^***	0.1588^***	0.0686^***	0.0986^***	0.1631^***	0.2287^***	0.0086^*
Capacity (short tons)	–0.0043	–0.0046	0.0049	–0.0098	–0.0354^*	–0.0605^*	–0.0732^*	–0.0211^**
Vehicle age (years)	0.0124	0.0073	0.0667^*	–0.0159	–0.0301	–0.0817^*	–0.0868^*	–0.0431^**
Adjusted R²	0.25	0.27	0.48	0.36	0.38	0.40	0.45	0.22

p < 0.05

^**

p < 0.01

^***

p < 0.001.