The Feasibility of Using Laser Doppler Vibrometer Measurements from a Passing Vehicle for Bridge Damage Detection

Table 1

Properties of the vehicle.

Half-Car property	Notation	Value
Weight of the sprung mass		16.2 t
Unsprung mass axle 1		900 kg
Unsprung mass axle 2		900 kg
Length of the vehicle		11.25 m
Tyre 1 stiffness		1.75 × 10^6 N/m
Tyre 2 stiffness		3.5 × 10^6 N/m
Damper 1 stiffness		4 × 10^5 N/m
Damper 2 stiffness		10^6 N/m
Damper 1 damping		10^4 Ns/m
Damper 2 damping		2 × 10^4 Ns/m
Body mass frequency		1.27 Hz
Axle 1 mass frequency		7.80 Hz
Axle 2 mass frequency		11.28 Hz
Centre of gravity distance from axle 1		4.71 m
Centre of gravity distance from axle 2		2.89 m