Design And Analysis Of Curve-Plate On Non-Linear Seat-Suspension

Passive isolation linear suspension is used mostly in engineering vehicle. Linear suspension can hardly meet both vibration stroke and the requirement of human-body riding comfort simultaneously, while the nonlinear characteristics seat-suspension can overcome the problem. Among the type of so called scissors linkage suspension, one obtaines the non-linear characteristic by the matchment of torsional bar and curve-plate. Designing the curve-plate matching with the torsional bar is a key process to get the non-linear characteristic. so it has important academic and practical significance to study. This paper studied systematically the motion relationship of parts in the non-linear seat-suspension, simplified the actual model. After solving the ideal non-linear characteristic, it got the contour of the curve-plate by the use of I-DEAS based on parameters of the motion stroke. About the non-linear characteristic seat-suspension which has stochastic input, it ascertained the the method of mechanism dynamic simulation to get the acceleration response. It established the dynamic model by I-DEAS through the technology of vitual prototype, got the stochastic stimulation in time domain through adverse-FFT to PSD of acceleration, proceeded multi-rigid-body dynamic simulation in which torsion spring took the place of torsional bar, and analyzed and mending the designed curve-plate through evaluation of human riding comfort. Analysis and comparison are made in different pretightening load condition and different damping effect of the system under different frequency stimulation. And got the best damping effect when pretightening load is 100 N under the specified condition. Comparison is also made with experiment. which can verify the reliability and accuracy of the simulation.