| Reciprocating piston engine is the main power source of motor vehicle and the rigid body vibration and elastic vibration are caused by its natural combustible gas pressureã€output torque of periodic fluctuationsã€the unbalanced inertial force(moment). However the engine suspension system is one of the major systems which influence the vehicle vibration, the fine capability of automobile suspension system is not only beneficial to reduce the vibration of the engine which transmit the frame and improve the dynamic characteristics and the riding comfort but also extend the service life of automobile. In this paper, from the point of the suspension component we designed a new kind of electromagnetic damping vibration absorber and carried out the principle test. The specific research works are as follows:(1) Researching and analyzing the powertrain suspension system. Expound the main production mechanism and characteristics of excited force which causes the vehicle vibration and use the single-freedom model to study the multiple-freedom model. At the same time, the static/dynamic characteristic of suspension system and decoupling design characteristic were clarified.(2) Calculating the magnetic field intensity which is on the symmetry axis of the annular permanent magnet. By the research of the theory of electromagnetic field, we deduced the integral expression of the annular permanent magnet field intensity in the space which is based on the magnetic charge model and molecular current model, according to the electromagnetic induction law. For the integral formula, we calculated the magnetic field intensity by the means of numerical method and matlab programming.(3) The damping coefficient expression of electromagnetic damping vibration absorber was deduced. We calculated the magnetic field intensity around the area of magnetic induction coil in the numerical method by using the integral expression of the permanent magnet field. Through screening the test data reasonably, we fit the analytic expression of the magnetic field intensity in the space in the response surface method. Based on the magnetic induction law, the damping coefficient expression of electromagnetic damping vibration absorber was deduced. (4) A new kind of electromagnetic damping shock absorber was designed. According to the electromagnetic induction law, we put forward a new kind of design idea for the electromagnetic damping vibration absorber and designed the structure principle of it. In the beginning, we analyzed and designed the performance parameters of each component of the electromagnetic damping vibration absorber; and then experiment design was made and the testing bench was built as well as the principle test was taken for the performance of vibration absorber. Its result showed that the vibration absorber was feasible. |
