Seen the gap up to international developed level from us.The research on this is truly helpful in theory and reference to in crease the reliability and work life of mechanical and electrical equip.

• 鉴于我国在这方面与国际先进水平的差距，此课题的研究有助于在理论和技术上进步，对提高机电设备的可靠性和使用寿命具有一定的应用和参考价值。