摘要
水电机组振动水平是表征机组运行稳定性的主要指标之一。本文以混流式机组负荷机架振动为例,通过研究相似机组负荷机架在动静荷载作用下的振动特性,提出了一个表征动静荷载关系比的无量纲参数。根据相似水力条件引起的机组振动所导致的相对功率损耗一致的假定,运用最小二乘原理,建立了机组单位转速与该振动参数的回归模型,进而以不同的置信水平划分了不同的振动区域,对振动水平进行评价,并提出了建议措施。成果表明利用该方法评价负荷机架振动水平是有效且可行的。
The vibration state is one of the main indicators characterizing the operation stability of hydropower unit. A non-dimensional parameter which reflects the relationship between dynamic and static loads is put forward, based on study on vibration performance on load frame of similar unit taking Francis units for example. Relative power consumption caused by the vibration which results from hydraulic factors is constant for similar units. Based on this assumption, a regression model between the vibration parameter and unit speed is finally established with the least square method. The range of vibration is divided into several different areas under different confidences to evaluate vibration state, and countermeasures are proposed. It turns out that it is an effective and feasible method for evaluating vibration state on load frame of Francis units.
出处
《中国水利水电科学研究院学报》
2014年第3期327-331,共5页
Journal of China Institute of Water Resources and Hydropower Research
基金
中国水利水电科学研究院科研专项(HM0145B212014)
关键词
混流式机组
负荷机架振动
振动建模
最小二乘原理
振动评价
Francis unit
vibration of load frame
vibration modeling
the least square method
evaluation of vibration state
