摘要
现场机组的振动往往并非由单一故障所引起,在支承刚度的各向异性以及组合故障的共同作用下转子的进动轨迹表现为十分复杂的形式。对机组实施现场动平衡的过程中由于受到这些因素的干扰而无法准确判断转子失衡形式,导致平衡收敛速度减慢甚至出现多次平衡仍无法实现有效减振的情况。通过对进动轨迹的分解,建立以正进动分量初相矢为平衡目标的改进全息动平衡法。由于该方法中排除了反进动分量的干扰,对转子的失衡响应描述更为清晰,提高了平衡收敛速度。此外,根据对进动比的变化趋势提出的现场动平衡终止条件定性地揭示了转子残余振动的来源,从而减少了现场动平衡的盲目性,提高了故障排查的效率。实例验证了改进全息动平衡法以及现场动平衡终止条件的有效性。
The vibration of machine set is seldom caused bY single fault. The compound effect of ubiquitous asymmetric stiffness and multi-fault makes rotors precess in a complicated form. The estimation of unbalance mass then can be disturbed by these factors and the field balancing operation will be ineffective. An improved holo-balancing method with the initial phase vector of forward precession component as the correction object is presented through the decomposition of synchronous precession orbit. Since the disturbance of backward precession component is eliminated, the balancing is more effective than those traditional methods. Furthermore, studies on the trend of rotor precession parameter during the balancing procedure are carried out and a stoppage criterion of field balancing operation is set to eliminate blindness. Two experiments are carried out and the effectiveness of the analytical result is verified.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2009年第8期45-51,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金(50475084)
国家重点基础研究发展计划(973计划
2009CB724405)资助项目
关键词
转子
进动比
现场动平衡
初相矢
故障
全息谱
Rotor Precession radius ratio Field balancing Initial phase vector Fault Holospectrum
作者简介
廖与禾，男，1973年出生，博士研究生，助理研究员。主要研究方向为大型旋转机组的故障诊断和现场动平衡技术。E-mail：yhliao@mailst．xjtu．edu．cn
