Comparison of 1- and 2-DOF Model of Engine Mount with MR Damping

具磁流變液阻尼引擎架一維與二維模型的動態分析比較

黃世欽(Shyh-Chin Huang) ； 施閔耀(Min-Yao Shi) ； 蔡朝洋(Chao-Yang Tsai)

《應用聲學與振動學刊》 7卷2期 (2015/12) Pp. 45-52

https://doi.org/10.6282/JASV.2015.7.2.05

摘要

本研究探討一具有磁流變液阻尼引擎架的振動與力的傳遞性。文中介紹傳統的一維與涵蓋車身動態的二維模型，並比較兩者結果的差異。結果顯示一維模型高估了振動位移響應但低估了力的傳遞性。最高的差異在位移部分可高達40%，傳遞力方面則可達20%，端視引擎架的阻尼值。本研究中並設計與製造了一個磁流變液阻尼器，並實際量測它的動態響應，實驗結果與理論計算相當吻合。本研究強化了將磁流變液阻尼運用於引擎架的可行性，同時也強調在分析中必須同時將車身的動態納入分析，不可僅獨立探討引擎的一維模型。

關鍵字

磁流變液阻尼 ； 引擎腳架 ； 車輛動態 ； 振動隔離 ； 振動傳遞

並列摘要

Vibration attenuation and force transmission of an MR engine mount were investigated. Two different models, the conventional 1-DOF and more sophisticated 2-DOF containing vehicle chassis dynamics, were theoretically compared. The engine displacement response and transmitted force to the vehicle body were derived and used as performance indicators. Theoretical results inferred that displacement response would be overestimated but transmitted force be underestimated in the simplest 1-DOF model. The differences could be up to 40% (displacement) and 20% (force) depending on engine mount's damping ratio. A flow mode MR damper was then designed and fabricated. Experiments verified MR’s performance and the results showed satisfactory agreement with the theoretical calculations. This investigation enhanced the capability of MR damper implemented into engine mount for vibration and force reduction at low speeds. It also showed to the audience that in vehicle dynamics the chassis dynamics might need to be included in designing the engine mount.

並列關鍵字

MR Damping ； Engine Mount ； Vehicle Dynamics ； Vibration Isolation ； Vibration Transmission