关键词: 测试精度, 轮胎力传感器, 模态分析, 稳定性, 质量

Abstract: The wheel force transducer(WFT) delivers the forces serially from road to tire and adds 4 kg to 10 kg mass to whole wheel, so how the additional mass affects the measuring precision of WFT and the stability of whole vehicle should be analyzed quantitatively. Two resistance strain gauge WFTs with 8 beams and 4 beams are employed respectively, and the model analysis are conducted for elastic body, original rim, the assembly of elastic body and modified rim. Then the additional deformation of elastic beam, motivated by the rotation centrifugal force of whole wheel and the vertical motion inertia force of elastic body outer ring, are analyzed comparatively. 15 DOF whole vehicle model is developed and 160° hand-wheel angle step input simulations with 90 km/h uniform speed are conducted, for quantifying the effect of WFT on vehicle stability based on sideslip angle and yaw rate. The research shows that the main factors increasing the measurement errors of WFT are elastic beam’s stretch and bending deflection both in the 1st frequency vibration of elastic body and motivated by the vertical motion inertia force of elastic body outer ring; the additional mass can change the vehicle stability and increase the response delay time.

Key words: Mass factor, Measurement precision, Modal analysis, Stability, Wheel force transducer