混凝土預拌車攪拌桶支撐副樑之受力分析與設計改善研究

Stress Analysis and Design Improvement for the Secondary Support Girder of the Mixing Tank on a Cement Mixer Vehicle

彭明卿(Ming-Ching Peng)

指導教授 ： 陳永樹

元智大學/工程學院/機械工程學系/碩士(2012年)

https://doi.org/10.6838/YZU.2012.00353

摘要

本研究主要針對混凝土預拌車在滿載狀況，且行駛於顛坡路段時，頻頻造成攪拌桶支撐副樑斷裂之問題，透過實驗及有限元素分析進行力學探究。在實驗部分，以水代替混凝土進行靜態裝水實驗，利用應變規量測即時擷取副樑結構應變情況，隨後並於滿載狀況下行駛於不良路況中，利用動態訊號擷取系統擷取加速度值。將動態加速度值轉入有限元素分析軟體內，做為承載樑之疲勞壽命分析的隨機負載歷程。為進一步了解混凝土預拌車整體受力變形狀況，因此同時以有限元素分析，計算混凝土預拌車於滿載下承載樑之受力變形，並與實驗數據做比對藉以修改設計進行改善，同時也應用有限元素結構分析加以驗證改善設計後之有效性。本研究透過上述之實驗與分析步驟，其短程效益為可以有效找出目前混凝土預拌車結構強度不足之癥結點，進而解決此結構之一系列問題。遠程效益則為建立起研究分析之能量，應用於其他類似之特殊車輛產品設計，將結構輕量化以降低成本，以及降低新產品開發時程，和避免設計品質不良所造成之修改費用。

關鍵字

混凝土預拌車 ； 疲勞 ； 結構輕量化 ； 結構分析

並列摘要

The study investigated the cracking problem of the secondary support girder of the mixing tank on a cement mixer vehicle through experiment and finite element analysis. This kind of damage was one of the common problems of the vehicle when running on the bumped road with full-load of cement. In the experiment under static loading, water was used as a substitute for cement, the strain variations on the supporting girder were recorded with the strain gage. Subsequently, the corresponding dynamic strains when running the vehicle on different road conditions were also acquired in real time by using the dynamic signal acquisition system. The real time dynamic accelerations were recorded with accelerometers and they were incorporated into to the finite element analysis software as the random input for the fatigue life analysis of the supporting girder. The analysis was extended to the entire tank supporting structure to understand the deformation under full loading condition of the cement mixer vehicle. These data were compared to those experimental data for design improvement use. Finite element analysis was also performed for verifying the effectiveness of the new design. Therefore, through the above mentioned experimental and analytical procedures, it can improve the structural insufficiency of the cement mixer vehicle right away. A series of damage issues of this structure will then be solved. However, the long term contributions can be quoted as in building up the technical capabilities for solving this kind of problems systematically. It can be extended for various structural designs of similar special purpose vehicles. The benefits such as the light weight design of the structure for cost saving, the reduction of development time, and avoiding those cost wasted due to the poor design quality can be achieved.

並列關鍵字

Cement mixer vehicle ； Fatigue ； Light weight design ； Structural analysis

參考文獻

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參考文獻

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