Експериментальні дослідження вертикальних коливань спеціалізованого транспортного засобу з нелінійним підресоренням при переїзді одиночної нерівності

Abstract

An ensuring the safety of goods and passengers transportation is one of the priority areas of automotive engineering. This point is particularly important for the transportation of dangerous goods. Here, providing high level of movement smoothness during the transportation is a point of great impor-tance due to the possibility of negative influence of vibrations on such categories of goods. This is can lead to emergency situations. In the paper a design of specialized vehicle with two levels of suspension is presented and analyzed. The specialized vehicle has additional level of cushioning with nonlinear characteristic, which has quasi-zero stiffness. Such, suspension is able to realize a vibro-isolating state of the transporting dangerous goods. The paper deals with an experimental investigations of the vibrations during the transportations of the goods which are mounted on specialized vehicle. As experiments the road tests have been done. Experiments were carried out on the base of a measurement system Ultra-V-I», which has been devel-oped at the Department of the Dynamics and Strength of Machines of the National Technical University Kharkiv Polytechnic Institute (Kharkiv, Ukraine). The measuring system consists of: a detector of vibration accelerations, an analogue-to-digital converter (ADC) and a portable computer. Ultra-V-I has a valid certificate of state metrological certification and allows to make a measurement of vibration acceleration at the point of investigated object. The paper considered the moving of specialized vehicle through a single roughness at different velocities. Thus, the cart moving on the road with asphalt concrete pavement at some fixed time moved a obstacle. The experiment was conducted at the speed of movement of 5, 10 and 20 km / h. The re-search has carried out separately for the vehicle without nonlinear vibration compensators and with them. Comparative analysis has shown that quasi-zero stiffness cushioning reduces the level of goods vibrations, so magnifying the movement smoothing.