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Title:
MEASURING APPARATUS
Document Type and Number:
Japanese Patent JP3412264
Kind Code:
B2
Abstract:

PURPOSE: To continuously monitor the parts of a helicopter.
CONSTITUTION: Vibration sensors 10-1 to 10-8 respectively detect the vibrations of the parts of a helicopter. The outputs are respectively amplified by amplifiers 12-1 to 12-8, and low frequency components are extracted by filters 14-1 to 14-8. Regarding an engine, 0Hz-1kHz are extracted. Regarding its rotor, 2.5-50Hz are extracted. Regarding a cooling fan, 2.5-500Hz are extracted. The measured data are stored in a primary memory 32 at interval of 0.1sec. When the memory 32 is fully stored, the oldest data is erased, and new measured data is stored. A secondary memory 34 stores data Fourier-transformed from the measured data at each five hours. The memories 32, 34 are formed out of nonvolatile memories and removable.


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Inventors:
Kuniyoshi Yamamoto
Sekizaki Seiichi
Hiroyuki Sato
Application Number:
JP15561194A
Publication Date:
June 03, 2003
Filing Date:
July 07, 1994
Export Citation:
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Assignee:
Asahi Kyoyo Co., Ltd.
International Classes:
G01R23/165; B64C27/04; B64D45/00; G01H17/00; (IPC1-7): G01H17/00; B64C27/04; B64D45/00; G01R23/165
Domestic Patent References:
JP618322A
Attorney, Agent or Firm:
Tsuneo Tanaka



 
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