频率指标方法在带附加空气室空气弹簧振动控制中的应用
The Application of Frequency Indicator Method to Vibration Control on Air Spring Damping System with Auxiliary Chamber

以Firestone公司生产的1T15M-2型膜式空气弹簧为基础，与容积为22 L的附加空气室和节流阀构成了带附加空气室空气弹簧减振系统。根据空气弹簧减振系统的加速度响应特性，设计了基于频率指标的振动控制程序。试验时向空气弹簧内部分别充入3种不同气压，采用激振频率为0.5 Hz~10 Hz的随机激振信号对减振系统激励。在每个采样周期内对簧上质量的加速度响应信号进行滤波和FFT变换，并提取出采样周期内激振能量最大对应的频率信号，根据频率的大小，执行器调节节流阀的开度，使空气弹簧减振系统分别工作在2个相对较优的加速度响应的某一个区域内。试验结果表明，在随机信号激励条件下，3种不同内压的空气弹簧系统最短经过约2 s可达到稳定响应状态，控制前后系统加速度响应的振幅相对最大加速度幅值减小了近50%。
Based on the 1T15M-2 reversible sleeve air spring manufactured by Firestone corp., an air spring damping system with auxiliary chamber was built, which mainly consists of an air spring, an auxiliary chamber with volume of 22 L and a controllable orifice valve. Based on the acceleration response characteristics of the air spring damping system, a kind of vibration control program was designed by frequency indicator. The air spring was set with three different levels of inner pressure during the test respectively. The exciting frequency of generator was changed from 0.5 Hz to 10 Hz randomly. The acceleration signals of sprung mass were purified by butterworth low pass filter, and then the signal was processed by using the fast Fourier transform (FFT). The frequency of acceleration signal with the maximum excitation energy was picked up in every sampling period. The open area of throttle valve was switched quickly to the one of the two relative optimized acceleration response zones according to the extracted frequency indicator. The experiment results showed that the shortest transition time was about 2 seconds when the air spring damping system got to a steady response state. The acceleration amplitude of air spring damping system was almost reduced by 50% compared to the max acceleration value. The research results provide a basis for developing the electrical control unit of semi-active air suspension system with continuous-adjustable stiffness and damping