THE STAND FOR CAR SUSPENSION BUMPER TEST

Described in the article stand was developed and constructed at the Department of Vehicle Design and Operation of Togliatti State University. It was created within the frames of the students’ research work.

The authors described the stand design, measuring equipment used stand operation, and the principles of its work.

This stand allows to define operating charts of car suspension bumpers of various types (for this purpose the stand is equipped with a special adjusting device to vary suspension bumper overall length dimension and the stroke of piston) allowing to evaluate their operating capacity. The authors present the techniques for defining of suspension bumpers characteristics – the dependence of rebound and compression resistance on the piston stroke speed against the cylinder walls.

The piston stroke speed against the cylinder walls is calculated using the formulas taken from the engine theory and allowing to calculate the parameters of crank and connecting-rod assembly of a heat internal combustion engine. The force of resistance to the suspension bumper piston movement passes through a piston driver to a strain-gage sensor registering resulting force.

 Using the suspension bumper characteristics received while processing test data, the authors determined the rebound and compression resistance coefficients, and then used them in vehicle math models for the study of ride comfort and road holding.

The developed and constructed stand for the car suspension bumper tests will allow to cut time necessary for design of suspension up dated according to the safety of traffic and ride comfort. At the same time, this stand can be used while studying the course units “Vehicle theory” and “Vehicle tests” during the academic activities at the Department of Vehicle Design and Operation.