结合振动频谱分析，判断出方向盘的怠速振动较大的原因是共振，并确定了修改支架方案。
With the vibration frequency analysis, the paper draws a conclusion that resonance is the reason of the bigger vibration of cheering wheel, and a revamping bracket plan is made.
发动机的各种故障会引起个别气缸气体作用力减小，导致总的反倒力矩平衡性恶化，致使发动机横向摆动加大，出现怠速异常振动。
It is pointed that engines various faults can make the gas acting pressure lower in individual cylinders, lead to worsen the balance of gross overturn moment, and wobble the idling engine.
怠速工况试验表明，优化后的挂钩不仅降低了车内驾驶员右耳侧噪声，而且减小了排气系统传到车身地板的振动。
Test result shows that vibration from exhaust system to floor and sound pressure to driver's right ear on idle running are reduced with the optimized hanger systems.
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