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The arm stand of dynamic compaction machinery is a large space of statically indeterminate truss structure welded by steel pipe. Its stability calculation is always difficult to calculate and design for the arm stand. Use FEA software ANSYS to establish a overall elastic-plastic FEA model of the arm stand of dynamic compaction machinery in working condition. The igenvalue buckling analysis and nonlinear...
In allusion to the frame of a light truck, by the iSIGHT for optimization platform and ANSYS for strength and stiffness calculation platform, with frame mass minimum for objective function, the parameters of the optimal thickness of the frame parts is sought and the optimal solution is obtained by using the first-order optimal design method with the premise of the frame strength, bending stiffness,...
Taking a two-axle truck for research object, a mathematic model and FEA model of 10 degrees of freedom finished automobile are established to describe the vibration of the truck. Virtual excitation of road is constructed through the basic theory of virtual excitation method and its statistical properties of the actual response are obtained. FEM theory is used in discrete the truck vibration structure...
In allusion to the multi-piece leaf springs of a truck, its standard multi-objective optimization model was established. Taking multidisciplinary optimization software iSIGHT as a platform, using the non-dominated Sorting Genetic Algorithm (NSGA-II) based on Pareto optimal concepts, seek for the optimal structural design scheme for multi-piece leaf springs of the minimum total quality and minimum...
In allusion to a certain kind of bracket of work cabin overhead support equipment components of the special vehicle, taking OptiStruct software as optimization design platform, the topology optimization of the bracket is carried out by using variable density method. The geometry model of the bracket is rebuilt and the finite element analysis of the bracket is carried out, then the stress and deformation...
The fatigue analysis model of vehicle frame based on random vibration theory is established according to studying a new special vehicle frame. According to the stress category of predicted points and material property, the modified fatigue curve(S-N curve) is obtained. Taking the FEA analysis results of the vehicle frame as the basis of fatigue calculation, the fatigue life and the fatigue damage...
The quality of suspension helical spring is very important to the stationarity and safety of automobile. Taking the automobile suspension helical spring as the research object, by using Pareto optimization theory and particle swarm optimization algorithm, the paper establishes a multi-objective optimization model of automobile suspension helical spring which is based on the Matlab optimization design...
Multi-objective particle swarm optimization is the research hot spot of the intelligent computing field at present, which has a more efficient information sharing mechanism than the genetic algorithm (GA) and artificial immune algorithm (AIA). In allusion to a certain kind of new freight car, the multi-objective optimization design of the transmission is carried out by using multi-objective particle...
In allusion to the heat-fluid-solid coupling field of a certain kind of barrel, the Kriging approximation calculation model of the barrel temperature field, which uses the orthogonal experimental design technology to collect samples, is built up with the Kriging structure approximate modeling technology, and the large sampling test is carried out. The test results show that the temperature Kriging...
In allusion to the frame of a certain semi-trailer, through adopting ANSYS software, its stress response, modal response and random vibration response were calculated with FEA method under various load cases. The finite element fatigue analysis was carried out in the form of load spectrum, as well as fatigue life and the stress strain variation laws of the vehicle frame under dynamic loads have been...
In allusion to the diaphragm spring of a certain type of freight car, based on multi-objective genetic algorithm, the design variables are selected optimally with design of experiment, and a multi-objective optimization model of diaphragm spring is built. On the basis of multidisciplinary optimization software iSIGHT, non-dominated Sorting Genetic Algorithm (NSGA-II) based on Pareto optimal theory...
This paper researches on the lift mechanism of an engineering car, and uses SimMechanics toolbox and Simulink toolbox to establish a mechanic system simulated model and hydraulic system simulated model; uses subsystem encapsulation technology of Simulink to package the modules; then establishes mechanic-hydraulic coupled model of the lift mechanism and realizes dynamic simulating analysis. It also...
A four-stroke direct injection diesel engine is taken as the study object, and a cylinder-jacket-coolant-piston coupling model is built up. With the research method of fluid- solid-heat coupling, the computational regions of both fluid and solid are coupled, which are separated in traditional temperature-field computation, and the puzzle of iterating difficultly due to the differences of temperature...
Taking a special vehicle frame as the study object, in allusion to the complex time-consuming FEA computation in the optimization design, the numerical approximation technology of Kriging method is adopted to establish the approximate mapping relationship between design variables of vehicle frame and structural strength, stiffness and weight. The genetic algorithm is employed to perform the optimization...
It is significant to study the structure safety of thin-walled vessel under thermo-solid coupled load. In allusion to a thin-walled vessel of failure receiving low-frequency and high-temperature thermal shock and pressure load, direct coupling model, temperature-related material model and Finite Element Method (FEM) were applied to calculate the response of transient temperature field and transient...
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