科研之友
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摘要
The evaluation of the pre tension of screwed joints using an acoustic resonance analysis is the subject of the presented investigations. The screw will be excited by impact and vibrate in a characteristic mode. This resulting vibration mode is depending on the current pre tension status of the screw. The main question of the dependency of a detected resonance frequency to the local stress state of a screwed joint was successful executed on an idealized model. In this case a local allocation of the resonant frequency to the screw joint as well as a dependency on tension state could be detected. These results were confirmed in a more complex component structure (gas engine) investigating the cylinder head screw connections (diameter M39, length 350 mm). In this case a local screw and stress dependent resonant frequency was detected. Using the method 48 surveyed screwed joints could be evaluated. The suitability of the process could therefore be successfully proved.
- 出版日期2015-10
