Crank train multi-body dynamic and finite element analyses for one-cylinder engine

2013 ◽  
pp. 127-130
Keyword(s):  
Finite Element ◽  
Finite Element Analyses ◽  
Multi Body ◽  
Body Dynamic

scholarly journals Multi Body Dynamic Equations of Belt Conveyor and the Reasonable Starting Mode

Symmetry ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1489
Author(s):  
Yongbo Guo ◽  
Fansheng Wang
Keyword(s):  
Finite Element ◽  
Recursive Formula ◽  
Conservative System ◽  
Conveyor Belt ◽  
Dynamic Equations ◽  
Lagrange’S Equation ◽  
Rigid Finite Element Method ◽  
Potential Capacity ◽  
Multi Body ◽  
Body Dynamic

Based on the rigid finite element method and multibody dynamics, a discrete model of a flexible conveyor belt considering the material viscoelasticity is established. RFE (rigid finite element) and SDE (spring damping element) are used to describe the rigidity and flexibility of a conveyor belt. The dynamic differential equations of the RFE are derived by using Lagrange’s equation of the second kind of the non-conservative system. The generalized elastic potential capacity and generalized dissipation force of the SDE are considered. The forward recursive formula is used to construct the conveyor belt model. The validity of dynamic equations of conveyor belt is verified by field test. The starting mode of the conveyor is simulated by the model.

Vehicle Frame Fatigue Life Prediction Based on Finite Element and Multi-Body Dynamic

2011 ◽  
Vol 141 ◽  
pp. 578-585 ◽  
Author(s):  
Si Hong Zhu ◽  
Zhi Jin Xiao ◽  
Xiao Yan Li
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Life Prediction ◽  
Element Model ◽  
Fatigue Life Prediction ◽  
Influence Coefficient ◽  
Loading History ◽  
Pavement Condition ◽  
Multi Body ◽  
Body Dynamic

To accurately predict the fatigue life of vehicle frame, MBS and FEM were integrated. A full multi-body dynamic model was established first, according to the spectrum of road surface which simulate the china’s pavement condition, loading history at 11 critical positions was calculated. Then the stresses influence coefficient was calculated in finite element model which establish in ANSYS. At the same time, according to the frame material’s S-N curve and character of the frame, the frame’s S-N curve was received. Finally, based quasi-static stress analysis, the frame structure’s fatigue life was predicted by using MSC-FATIGUE. The fatigue analysis results were reasonable and could be the foundation for the research about lightening the structure of the frame.

scholarly journals Shell Analysis and Optimisation of a Pure Electric Vehicle Power Train Based on Multiple Software

2018 ◽  
Vol 9 (4) ◽  
pp. 49
Author(s):  
Shaocui Guo ◽  
Xiangrong Tong ◽  
Xu Yang
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Electric Vehicle ◽  
Safety Factor ◽  
Topology Optimisation ◽  
Power Train ◽  
Engine Mount ◽  
Dynamic Software ◽  
Multi Body ◽  
Body Dynamic

Motor end cover mounting fracture is a problem recently encountered by novel pure electric vehicles. Regarding the study of the traditional vehicle engine mount bracket and on the basis of the methods of design and optimisation available, we have analysed and optimised the pure electric vehicle end cover mount system. Multi-body dynamic software and finite element software have been combined. First, we highlight the motor end cover mount bracket fracture engineering problems, analyse the factors that may produce fracture, and propose solutions. By using CATIA software to establish a 3D model of the power train mount system, we imported it into ADAMS multi-body dynamic software, conducted 26 condition analysis, obtained five ultimate load conditions, and laid the foundations for subsequent analysis. Next, a mount and shell system was established by the ANSYS finite element method, and modal, strength, and fatigue analyses were performed on the end cover mount. We found that the reason for fracture lies in the intensity of the end cover mount joint, which leads to the safety factor too small and the fatigue life not being up to standard. The main goal was to increase the strength of the cover mount junction, stiffness, safety coefficient, and fatigue life. With this aim, a topology optimisation was conducted to improve the motor end cover. A 3D prototype was designed accordingly. Finally, stiffness, strength, modal, and fatigue were simulated. Our simulation results were as follows. The motor end cover suspension stiffness increases by 20%, the modal frequency increases by 2.3%, the quality increases by 3%, the biggest deformation decreases by 52%, the maximum stress decreases by 28%, the minimum safety factor increases by 40%, and life expectancy increases 50-fold. The results from sample and vehicle tests highlight that the component fracture problem has been successfully solved and the fatigue life dramatically improved.

Design of flexure revolute joint based on compliance and stiffness ellipsoids

2021 ◽  
pp. 095441002110169
Author(s):  
Jing Zhang ◽  
Hong-wei Guo ◽  
Juan Wu ◽  
Zi-ming Kou ◽  
Anders Eriksson
Keyword(s):  
Finite Element ◽  
Single Point ◽  
Synthesis Method ◽  
Nonlinear Finite Element ◽  
Finite Element Analyses ◽  
Rotational Stiffness ◽  
Rotational Angle ◽  
Parameterized Model ◽  
Flexure Joints ◽  
Translational Stiffness

In view of the problems of low accuracy, small rotational angle, and large impact caused by flexure joints during the deployment process, an integrated flexure revolute (FR) joint for folding mechanisms was designed. The design was based on the method of compliance and stiffness ellipsoids, using a compliant dyad building block as its flexible unit. Using the single-point synthesis method, the parameterized model of the flexible unit was established to achieve a reasonable allocation of flexibility in different directions. Based on the single-parameter error analysis, two error models were established to evaluate the designed flexure joint. The rotational stiffness, the translational stiffness, and the maximum rotational angle of the joints were analyzed by nonlinear finite element analyses. The rotational angle of one joint can reach 25.5° in one direction. The rotational angle of the series FR joint can achieve 50° in one direction. Experiments on single and series flexure joints were carried out to verify the correctness of the design and analysis of the flexure joint.

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