发明授权
US4924706A Method and apparatus for determining resonant frequency of a turbine
blade made of a meterial not responsive to a magnetic field
失效
用于确定由不响应于磁场的仪表制成的涡轮叶片的共振频率的方法和装置
- 专利标题： Method and apparatus for determining resonant frequency of a turbine blade made of a meterial not responsive to a magnetic field
- 专利标题（中）： 用于确定由不响应于磁场的仪表制成的涡轮叶片的共振频率的方法和装置
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申请号： US334735申请日： 1989-04-07
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公开(公告)号： US4924706A公开(公告)日： 1990-05-15
- 发明人: Donald W. Moore
- 申请人： Donald W. Moore
- 申请人地址： PA Pittsburgh
- 专利权人： Westinghouse Electric Corp.
- 当前专利权人： Westinghouse Electric Corp.
- 当前专利权人地址： PA Pittsburgh
- 主分类号： F01D5/16
- IPC分类号： F01D5/16 ; G01H13/00 ; G01M7/02 ; G01N29/12
摘要：
A method and apparatus for resonant frequency testing of free standing turbine blades made of a material, such as titanium, that is not responsive to a magnetic field is disclosed. A lightweight shim 12 made of a magnetically responsive material such as steel, weighing on the order of 0.5 grams, is attached to the convex side of the blade 10. The shim 12 is excited by an oscillating magnetic field and moves the blade 10 accordingly. The maximum amplitude of blade 10 movement is recorded and used to determine the resonant frequency as the excitation frequency of the magnetic field is swept through a frequency window range. The low weight of the shim 12 does not materially change the resonant frequencies of the blade 10.
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