Da Wei Liu

Dynamic Characteristics Simulation for Lifting Mechanism of Dump Truck Based on Virtual Prototype

In order to study the dynamic characteristics of dump truck with a T-type lifting mechanism, a detailed multi-body dynamic model of a dump truck was established by using SIMPACK software. With this model, which includes front suspension, balanced rear suspension, carriage, lifting mechanism, tyre model and so on, the kinematics and dynamics of the dump truck were studied by simulation. The variation of angular velocity, angular acceleration and applied force of carriage, tension rod and cylinder with lifting angle were obtained. This study will provide scientific reference for the structural design and strength analysis of lifting mechanism.

Analysis of the Crack of Heavy Dump Truck Cargo Body Floor

In view of the heavy dump truck occurred cargo body floor cracking problems in the process of using, this paper established cargo body finite element analysis (FEA) model with the shell elements as basic element, and calculated the strength of the cargo body floor by using the Hyperworks (a FEA software). The results of finite element analysis indicate that the crack took place because the stress of the connection of floor and support beam of front plate and the connection of floor and backing plate of turnover bearing was close to or exceed the material yield strength. On the basis of the calculation, we worked out the causes of the abnormal floor crack, which accord with the actual crack case. According to the requirement of practical process, the structure of floor was improved, thus the maximum stress value decreased 30% and 80.9% at two positions respectively, compared with the original structure, this shows that the improved method is effective.

Simulation Analysis on Ride Comfort of Heavy Vehicle

In this paper, a detailed rigid-flexible coupling multi-body dynamic model of heavy vehicle was established using multi-body dynamics method, and B class road model was built using harmonic superposition method. Then, the platform of heavy vehicle dynamics simulation was established. The driver seat acceleration and tire dynamic load were simulated at different speeds under the input of different random road excitations. According to the ride comfort evaluation method provided by ISO2631-1, total weighted root-mean-square (RMS) acceleration evaluation method was used to evaluate the ride comfort of heavy vehicle at different ride speeds.

Dynamic Analysis of Lifting Mechanism Based on Rigid-Flexible Coupling

To obtain realistic dynamic characteristics of the lifting mechanism, the liftarm and drawbar were regarded as flexible bodies. The modal neutral file (MNF) of liftarm and drawbar were obtained from modal analysis conducted by finite element analysis (FEA) software MSC.Patran/Nastran . Then the MNF were translated into ADAMS, a rigid-flexible coupling model of the lift mechanism was built by replacing the rigid bodies with MNF. The forces of each hinge points in the rigid-flexible system, which were obtained from dynamic analysis, were compared with the rigid ones. The results showed that forces obtained from the rigid-flexible system were smaller than the rigid ones, which provided a reference for the design and improvement of the lifting mechanism.

Strength Analysis for Lifting Mechanism of Dump Truck Based on Virtual Prototype and Finite Element Technology

In order to study the strength analysis of dump truck with a T-type lifting mechanism, a detailed multi-body dynamic model of a dump truck was established by using SIMPACK software. With this rigid-flexible coupling model, which includes front suspension, balanced rear suspension, carriage, lifting mechanism, tyre model and so on. Dynamical analysis was carried on the dump truck, the variation of application force of lifting mechanism with lifting angle was obtained. Finite element model of a dump truck was established by using Hypermesh software. Strength Analysis was studied on the dump truck. This study will provide scientific reference for the structural design and improvements of lifting mechanism.

Simulation Study of Heavy Vehicle Road-Friendliness under Bilateral Tracks’ Excitation

In order to study the road friendliness of heavy vehicle under bilateral tracks’ excitation, the spatial domain random pavement under bilateral tracks’ excitation was simulated through the second-order rational function power spectral density (PSD) and the harmonic superposition method. A rigid-flexible coupling virtual prototype of the heavy vehicle was established by using SIMPACK software. Then a driving dynamic model of heavy vehicle was established under bilateral tracks’ excitation. The tires loads of the vehicle’s each axle were calculated. The dynamic load coefficient (DLC) and 95 percentage fourth power aggregate force were used as the road-friendliness criterions for studying the road-friendliness of heavy vehicles under bilateral tracks’ road excitation. The research results could provide the basis for the prediction of road friendliness of heavy vehicle.

Fatigue Life Analysis of Lifting Mechanism Rod Based on Virtual Prototyping and FEM

In order to calculate fatigue life of dump truck lifting mechanism’s structure components, a virtual prototyping model of lifting mechanism was built with Multi-body Dynamic Simulation Software ADAMS. The variation of applied force of lifting mechanism rod with lifting angle was obtained from dynamic analysis of lifting mechanism. A finite element (FEM) model of the rod was established using FEM Software MSC.PATRAN/NASTRAN, and its structural strength was analyzed. On this basis, S-N curve of the rod and linear cumulative damage law was combined to calculate the rod’s fatigue life with Fatigue Analysis Software MSC.Fatigue using nominal stress method. This study provided a reference for the design and improvement of the lifting mechanism.

Optimum Design of Kitchen Garbage Truck Lifting Mechanism Based on Virtual Prototype

The lifting mechanism’s mechanical system and hydraulic system were built by the mechanical system dynamics software ADAMS for improving the mechanism’s performance. The hydraulic-mechanical virtual prototype model was established by the integration of the two systems through parameter correlated technology under ADAMS environment. The locations of revolute joints were optimized with the minimum of the cylinder forces as the optimization goal, by using the OPTDES-GRG and the main design points were parameterized. The optimization results show that the maximal cylinder forces had reduced by 16.5% over the non-optimum one, while the lifting force has reduced by 15.7% in the work process of lifting mechanism.

A Structure Optimization for Hooklift Arm Device Based on the Genetic Algorithm

Based on the theory of FEM, the hooklift arm is modeled with the FEM software, and the structure of the device is optimized with genetic algorithm in a multi-objective/multi-parameter optimization environment, which results in an optimal design decision of the hooklift arm device under the engineering constraint. Comparison between optimized design decision and original design decision shows that the optimization is correct and the proposed multi-objective/multi-parameter optimization method is effective in improving the hooklift arm device.