電動自行車車架振動分析

電動自行車最近十幾年發展迅速，為人們提供了一種輕便、節能、環保型的交通工具。電動車的共振特性是反映駕駛人員舒適程度的指標，為了探討電動自行車車架的動態性能，應用ANSYS Workbench軟件分析電動自行車車架的自然頻率和其對應的模態振型。利用實驗模態分析找出自行車車架本身的頻率，來驗證理論模態分析與實驗模態分析是否相符合，證明自行車車架有限元模型的正確性。然後再加入馬達的激振力進行諧響應分析，計算出自行車車架在某段頻率下的響應，得到響應值與頻率的曲線。接著利用實車測試馬達運轉下所量測的頻譜圖，來確定兩種分析方法是否相符。利用有限元法求解出自行車車架的自然頻率，知道是否會與馬達轉動下的頻率相接近而產生共振，便可先進行車體的修整避開其共振。利用此種方法希望能達到降低開發成本，減少打樣時間的作用。

關鍵字

模態；自然頻率； ANSYS Workbench ；簡諧響應

並列摘要

The electric bicycle recent several years development is rapid, has provided one kind for the people facilely, the energy conservation, the environmental protection transportation vehicle. Electric cars resonance response is the reflection drives the personnel comfortable degree the target. In order to study the dynamic performance of electric bicycle frames, the nature frequencies and mode shape are analyzed by using ANSYS Workbench software. The frequency of the bicycle frame by using Experimental modal analysis, confirms the Theory modality analysis and the Experimental modality analyzes whether tallies, proves the bicycle frame finite element model the accuracy. Then joins the motor the exciting force to carry on the harmony response analysis, calculated the response of the bicycle frame in a certain frequency, obtains the response value and the frequency curve. Then, under the motor operation of the vehicle testing of measured spectrum, to determine the two analysis methods are consistent, using the finite element method for solving the natural frequency of the bicycle frame, to know whether under the motor rotation frequency close to resonance can be the first body of the dressing to avoid its resonance. The use of such methods hope that it can reduce development costs, reduce proofing time role.