Avvibrering av drivenhetsupphängning CV90: En studie gjord på BAE systems i Örnsköldsvik
Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
The noise level on CV90 has always been a big problem, loud noise and great vibrations have been a part of everyday work for the crew. BAE-systems are the developerOf CV90 have started a work with the goal to lower the noise and vibrations in the vehicle. Tests have been made witch shows that the biggest source of the problem is the track. A new track has been constructed, in rubber instead of the traditional steel track. Tests witch have been made on the rubber track shows that nest source of vibrations and noise is the engine and transmission suspension, today the transmission is mutely mounted on the body.The new suspension has been modified from the present, but it has been made bigger so a rubber damper can be fitted between the transmission and the holder. When the rubber damps 1cm it will absorb the force of 2.5G, meanwhile it must hold the force of 5G in every direction. The forces have been simulated by FEM-analysis.A new construction have been made witch fore fill the demands on forces. The natural frequency on the rubber has been calculated to 9.83 Hz, which is around 3 times less the frequency on the engine when the engine is idling(33.33Hz). The idling frequency on the engine is the lowest frequency that will affect the dampers. The transmission will have full damping effect on idling, when the speed raises will the track be the biggest source of vibrations and noise. But on idle this problem will be considerably lowered.
Place, publisher, year, edition, pages
2013. , 42 p.
, MA, 1311
IdentifiersURN: urn:nbn:se:umu:diva-80644OAI: oai:DiVA.org:umu-80644DiVA: diva2:650604
Bachelor of Science Engineering in Mechanical Engineering
Hassan, Osama, Universitetslektor
Schedin, Staffan, Universitetslektor
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