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| Analysis and experiment of frequency response characteristics of two-stage series-connected ISD suspension |
| School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract Based on the real analogy between inerterspringdamper mechanical system and capacitorinductorresistor electrical system, an inerterspringdamper (ISD) vehicle suspension with two stages connected in series was developed according to the principle of cascaded filter. In the suspension, the first stage is a spring in parallel with a damper, and the second stage is a parallel springdamper augmented by an inerter in parallel. A quartercar vehicle model was built to simulate and analyze frequency response characteristics of the suspension system by mechanical impedance method. A rackandpinion inerter and a prototype suspension were designed to investigate the frequencydomain performance in the suspension by bench test. The experimental results indicate that compared with conventional suspension, the improved suspension has good lowfrequency response characteristics. The frequency of body resonance is reduced from 1.3 Hz to 0.8 Hz. Improvements of 52%, 50% and 15% are achieved for peak values of gains in body acceleration, dynamic tire load and suspension working space in lowerfrequency stage. The proposed suspension can effectively suppress body resonance with improved ride comfort.
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2012, Vol. 33 
