双泵源电液舵机线谱噪声控制

Linear spectrum noise control of electro-hydraulic steering gear with dual pump source

采取变频调速控制策略的电液舵机可大幅降低操舵噪声,但系统线谱噪声明显且随工况变化而迁移,衰减难度大。基于此,结合泵源双冗余的电液舵机原理,仅改变原系统控制策略,提出基于辅助泵源合流的压力脉动控制措施。理论分析指出,两泵源转速一致,初始相位角为半个周期可衰减奇数次谐波。设计了主从同步控制策略,配置相应硬件,并应用于实际系统,实测相同操舵工况下可降低基脚结构振动总级3～5 d B,一阶线谱最大可衰减23 d B。

Electro-hydraulic steering gear system adopted variable frequency speed control strategy,has a characteristic of obvious linear spectrum noise,and it is difficult to attenuate with the changing working condition. Combined with the principle of the electro hydraulic steering mechanism of double redundancy pump source,a pressure ripple control strategy based on the auxiliary pump source confluence was proposed,and it only changed the control system. The theoretical analysis indicates that the pressure ripple of odd harmonics can be attenuated when the two pump sources rotate at the same speed,and the initial phase difference at half cycle. Thus,the master slave synchronization control strategy was adopted,and the corresponding hardware was configured. With the method applying to actual steering gear system,the structure vibration on the pedestal can reduce 3~5 dB,and the first order line spectrum can attenuate 23 dB.