汽车制动系统用滚珠丝杠副振动检测方法

Vibration measurement of ball screws used in automobile braking systems

针对汽车制动系统用滚珠丝杠副的振动检测技术进行研究.根据汽车制动系统用滚珠丝杠副的结构、尺寸和运动特征,提出振动检测方法,研制振动检测设备;基于运动学得出滚珠丝杠副在螺母旋转条件下的滚珠公转角速度、自转角速度及滚珠通过反向器频率的表达式;以某电动助力制动系统用滚珠丝杠副为试验对象,在螺母旋转驱动以及不同转速条件下测量丝杠沿轴向和径向的振动.通过分析振动幅值的时频分布特征,发现被测丝杠副在滚珠通过反向器频率及其倍频附近具有较大的振动幅值.采用一倍频程均方根(RMS)评价汽车制动系统用滚珠丝杠副的振动水平,得到滚珠丝杠副的振动能量在不同转速条件下的倍频程分布特征.

The vibration detection technology of ball screws used in automobile braking systems was studied.The vibration detection method of ball screws was proposed and the vibration detection equipment was developed,according to structure,size and motion characteristics of ball screws used in automobile braking systems.The expressions of balls’rotation and revolution velocities and frequency of balls passing through reversers were derived under the condition of nut rotation based on kinematics.Then,the axial and radial vibration of ball screws used in an electric power braking system was measured under the conditions of different nut rotation speeds.The time-frequency distribution characteristics of vibration amplitude were analyzed,and results showed that the measured ball screws had prominent magnitudes near the frequency of balls passing through reversers and its multiplication orders.Lastly,the vibration levels of ball screws were evaluated by using root mean square(RMS)values in octave bands,and the energy distribution characteristics of vibration were obtained in octave bands under different nut rotation speed conditions.