归一化小波能量熵的弹上伺服机构传动链动态可靠性评估

Dynamic Reliability Evaluation of Transmission Chain on Missile Servo Mechanism with Normalized Wavelet Energy Entropy

针对伺服机构关键传动链对开展基于归一化小波能量熵的动态可靠性评估方法研究,摆脱传统可靠性评估方法的大样本局限。借助标准化冗余第二代小波包变换对所采集的振动信号进行精细化分解与状态特征定量提取,由此获得各频带相对能量分布来表征传动链运行状态,然后采用归一化小波能量熵描述传动链状态的平稳性与系统确定性程度。工程实例表明了该方法的有效性,并准确评估了机构传动链的可靠性。

Studies the dynamic reliability evaluation method based on normalized wavelet energy entropy for the key transmission chains of servo mechanism, which gets rid of the large sample limitations of traditional reliability assessment methods. By normalized redun- dant second generation wavelet packet transform, the collected vibration signals are decom- posed and the state features are extracted. The relative energy distribution of each frequency band is used to transmission chain. Then, the normalized wavelet energy entropy is used to describe the stability of the transmission chain and the degree of system certainty. The engineering example shows the effectiveness of this method and evaluates the reliability of the transmission chain.