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首页> 外文会议>Proceedings of the ASME power conference 2009 >IDENTIFICATION OF ABNORMAL ROTOR DYNAMIC STIFFNESS USING MEASURED VIBRATION INFORMATION AND ANALYTICAL MODELING
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IDENTIFICATION OF ABNORMAL ROTOR DYNAMIC STIFFNESS USING MEASURED VIBRATION INFORMATION AND ANALYTICAL MODELING

机译：利用测得的振动信息和解析模型识别异常转子动力刚度

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摘要

It is a relatively common practice to address the problem of unacceptable synchronous (IX) vibration levels (like unbalance) by applying corrective balance weights after a thorough review of vibration measurements, available engineering information, and prior balancing history of a unit if available. The balance history might include balance plane weight maps and/or balancing influence data. On occasion, other vibration malfunctions and symptoms within measured vibration data, such as misalignment, a rub, or proximity probe journal target area slow roll (sometimes called "runout" or "glitch") can also appear to be "unbalance" but are not. A principal requirement when performing any corrective balancing of a rotor is that the fundamental synchronous rotor response of the unit should always be linear and time invariant. The fundamental synchronous rotor response is directly proportional to dynamic forces and inversely proportional to dynamic stiffness. If the principle requirements cannot be met while balancing, any further balancing of the rotor should be terminated and other root causes for the unacceptable synchronous vibration levels should be investigated.rnThis paper will discuss a case history involving a steam turbine generator unit where excessive synchronous vibration levels were measured at the LP turbine bearings during transient and steady state operation. The initial concern was a steady increase in vibration levels at the LP turbine under steady state conditions. Prior balancing history and balancing information was reviewed and initial corrective balancing was performed. Initial correction of the unbalance proved to be inadequate, and the unit exhibited a significant change in balance influence. Since the response of the rotor to balance correction was not predictable and inconsistent with priorrnbalancing data, alternative root causes for the unbalance symptoms were investigated. Integration of measured vibration data and numerical modeling were essential with proper identification of the root cause of the unbalance symptoms.
机译：解决振动不可接受的同步（IX）水平问题（如不平衡）是一种相对普遍的做法，在对振动测量，可用的工程信息以及设备的先前平衡历史（如果有）进行彻底检查之后，应用校正平衡锤。平衡历史记录可能包括平衡平面重量图和/或平衡影响数据。有时，测得的振动数据中的其他振动故障和症状，例如未对准，摩擦或接近探针轴颈目标区域的缓慢滚动（有时称为“跳动”或“毛刺”）也可能看起来是“失衡”的，但并非如此。对转子进行任何校正平衡时的主要要求是，设备的基本同步转子响应应始终是线性的，并且是时不变的。同步转子的基本响应与动力成正比，与动力刚度成反比。如果在平衡时不能满足原理要求，则应终止转子的任何进一步平衡，并应研究造成不可接受的同步振动水平的其他根本原因。在瞬态和稳态运行期间，在LP涡轮轴承上测量了液位。最初的关注是在稳定状态下低压涡轮机的振动水平稳定增加。审查了以前的平衡历史记录和平衡信息，并进行了初始校正平衡。事实证明，不平衡的初始校正是不充分的，并且该单元在平衡影响方面表现出显着的变化。由于转子对平衡校正的响应是不可预测的，并且与先前的平衡数据不一致，因此研究了不平衡症状的替代根本原因。要正确识别不平衡症状的根本原因，必须将测得的振动数据与数值模型相集成。

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