Finite element analysis and optimization for static and dynamic characteristics of diesel forklift frame

doi:10.3785/j.issn.1008-973X.2019.09.001

Journal of ZheJiang University (Engineering Science)

2019, Vol. 53

Issue (9): 1637-1646 DOI: 10.3785/j.issn.1008-973X.2019.09.001

Mechanical Engineering

Finite element analysis and optimization for static and dynamic characteristics of diesel forklift frame

Shui-guang TONG1(

),Jia-zhi MIAO1,Zhe-ming TONG1,*(

),Shun HE1,Shu-feng XIANG2,Xiang-hui SHUAI2

1. College of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
2. Hang Fork Group Co. Ltd, Hangzhou 311305, China

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Abstract

To verify the reliability of the 3-ton diesel forklift frame developed by a high-tech enterprise and to further improve its comprehensive performance, static and dynamic characteristics of the frame were analyzed by finite element method. The situation of forced frame under the critical condition was calculated. The preceding six-order natural frequencies and shapes were obtained by modal analysis. The harmonic response of the frame was analyzed based on the results of modal analysis. Finally, the high damping M2052 alloy gasket was used to optimize the vibration performance of the frame. Results show that the maximum stress of the frame was 141.75 MPa under the critical condition, which was lower than the allowable stress of the frame material. Therefore, the frame has high safety performance. The front-end plate of the frame has a large amplitude near the first order natural frequency. The frame amplitude peak decreased up to 20% by using the high damping M2052 alloy gasket, and its vibration performance is improved obviously.

Key words： forklift frame static and dynamic characteristics finite element analysis (FEA) high damping M2052 alloy gasket aseismic performance

Received: 12 July 2018 Published: 12 September 2019

CLC:

TH 242

Corresponding Authors: Zhe-ming TONG E-mail: cetongsg@zju.edu.cn;tzm@zju.edu.cn

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Cite this article:

Shui-guang TONG,Jia-zhi MIAO,Zhe-ming TONG,Shun HE,Shu-feng XIANG,Xiang-hui SHUAI. Finite element analysis and optimization for static and dynamic characteristics of diesel forklift frame. Journal of ZheJiang University (Engineering Science), 2019, 53(9): 1637-1646.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2019.09.001 OR http://www.zjujournals.com/eng/Y2019/V53/I9/1637

内燃叉车车架静动特性有限元分析及优化

为校验某高新企业研发的3 t内燃叉车车架可靠性并进一步改善其综合性能，采用有限元法分析其静动特性.计算车架在临界工况下的受力情况；进行模态分析，得到前6阶固有频率和振型；以模态分析结果为基础对车架进行谐响应分析；利用M2052高阻尼合金垫片对车架振动性能进行优化. 结果表明：车架在临界工况下的最大应力达到141.75 MPa，低于车架材料的许用应力，具有较高安全性；车架前端板在一阶固有频率附近的振幅较大，改用M2052高阻尼合金垫片使其振幅峰值最大下降了20%，振动性能得到了明显改善.

关键词： 叉车车架, 动静特性, 有限元分析, M2052高阻尼合金垫片, 减震性能

Fig.1 Diagram of forklift truck frame model before and after simplification

Fig.2 Optimization flow chart of mesh division scheme

Tab.1 Global mesh division scheme of forklift frame

Fig.3 Mesh division scheme for local structure of forklift frame

Fig.4 Mesh division results of forklift frame

Tab.2 Working condition of forklift frame

Fig.5 Loads and constraints on forklift frame

Fig.6 Force diagram for forklift mask

Fig.7 Equivalent stress cloud map of forklift frame

Fig.8 Structural error cloud map of forklift frame

Fig.9 Total deformation cloud map of forklift frame

Fig.10 Vibration mode diagram for first six orders of forklift frame

Tab.3 Natural frequencies and vibration mode description for first six orders of forklift frame

Tab.5 Inherent balance characteristics of several common engines

Tab.4 Main technical parameters of 4D32XG30 Xinchai engine

Fig.11 Balance analysis of reciprocating inertia force of in-line four-cylinder engine

Fig.12 Force transmission in crank and connecting rod mechanism

Fig.13 Time-dependent change of engine overturning moment

Fig.14 Loading position of overturning moment of forklift frame

Fig.15 Acceleration response of frame’s front-end plate when forklift starting at idle condition

Fig.16 Material of frame’s front-end plate and gasket

Tab.6 Mechanical property parameters of M2052 alloy

Fig.17 Acceleration response of frame’s front-end plate after gasket material being changed


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