PURPOSE: To make it possible to surely detect vibrations generated by the open and close operations of intake and discharge valves, by detecting vibrations generated by the rotation of a crank, and by extracting the natural frequency component of the rotation of the crank from the detected output.
CONSTITUTION: Sensors S1, S2 such as, for example, strain gages, for detecting vibrations generated by the rotation of a crank 2 are attached on the bearings 10a, 10b of drive shafts 9a, 9b. Sensors S3 through S6 are also secured to the base section sides of cylinders 3a through 3d so that vibrations generated by the open and close operations of intake valves 5a, 5b and discharge valves 6a, 6b are detected as electrical signals. Accordingly, if any abnormality is brought about so that the peak value of the natural frequency component of the vibrations is increased, the generation of abnormality in the open and close operations of the valves may be detected by observing the exsistence of a peak value which exceeds a predetermined level after the natural frequency component is extracted from the detected outputs of the sensors S1, S2.
| JPS6021423 | VIBRATION MONITORING APPARATUS |
| JP2022082319 | INSPECTION SYSTEM AND ANALYSIS DEVICE |
HASEGAWA TOORU
MAEKAWA KENJI
TOYODA TOSHIO
YOKOKI SEISHI
NIPPON STEEL CORP
NITTETSU DENSETSU KOGYO
| JPS56104222A | 1981-08-19 |
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