Applied Mechanics and Materials Vols. 385-386

Abstract: Submersible electric pump units are connected by bolts. This paper uses finite element analysis method to simulate how the pump joint bolt behave when it transmit torque.In this paper, temperature method is adopted to simulate the bolt preload and axial deformation.It also used to analyse and calculate the limited value when submersible electric pump units transmit torque under different preload. All of this provide the designing of connecting bolt preload and construction with theoretical basis.

Abstract: The dynamic optimization of a main drive system in a W-type compressor with friction of joints are studied by ADAMS , a special software for dynamical simulation. First the dynamical simulating model for the system is built considering joint friction in ADAMS . The dynamic response of the crankshaft journal center and dynamic reacting forces of the two rolling bearings are obtained on rated operating condition. Also the average value of the mechanical efficiency of reciprocating compressor was revealed .Then the mathematical model for dynamic optimization is presented, its objective function is mechanical efficiency of reciprocating compressor,and the design variable are the angle of cylinder lines and the rotation speed of crankshaft.The parametric simulating model is constructed in ADAMS to search the optimum solution.The relation between the design variable and objective value is disclosed through 'DOE' ,which is a function module in the design evaluation tools of ADAMS. Numerical results are available for the dynamic design of reciprocating compressor.

Abstract: The reactions, equations of moment and the overall moment of two planes were deduced based on mechanics of materials, as the main shaft was assumed to be a homogeneous three-section beam. Based on the fourth strength theory, equivalent stresses of three cross sections were solved. Based on the deduced conclusion, the equivalent stress of a various ultimate load cases were solved automatically by entering the loads of the hub center in the Excel, which was applied to the design and optimize for the main shaft.

Abstract: The relationship between the difference of the driver behavior and energy consumption in the same bus line was studied through analyzing the inlet parking process of the driving cycles in order to solve the problem that the practical benefits in endurance mileage of the electric buses differed a lot. It showed that the energy recycled in the inlet parking process differed 21% between the best driver and the worst one and the energy difference was influenced dramatically by the accuracy of vehicle speed prediction and the tendency of deceleration of drivers.1.

Abstract: The air-conditioned room in small space is studied by establishing the mathematical model of the air flow arrangement for energy saving. The energy saving effect is analyzed numerically at different angles under circumstance of the most common way of one-side up supply and down return. Our results show that if air supply angle is set at , the energy utilization coefficient is maximum value,and air condition reaches best energy-saving state. Our design method can be referenced valuably for the air exit design and regulating of air-conditioned room in real project.

Abstract: Pollution flashover fault is one of the most common fault in transmission line, the study of the features of insulator deposition of dirt is very important. Mainly considering the factor of the choice of the maximum wind speed, the adjustment of wind speed, the stability of the flow field. Design and build the wind tunnel laboratory, through the establishment of the wind tunnel laboratory to simulate the features of insulator deposition of dirt.

Abstract: In the field of automotive engineering, noise and vibration in the car comes mainly from the engine and the road passed through the body, suspension, mount and exhaust system path to the car or reverberation. So this article , a model of white body transfer path analysis and research, improves the rigidity of white body, to reduce noise, vibration, and weight is reduced, and find out the resonance phenomena because of insufficient stiffness of car body, combining body CAE modal analysis results provide the theoretical basis for the optimization of structural damping.

Abstract: In the light of the hovercraft simulation system of complex scene real-time rendering simulation requirements and driving control practical training, the principle of particle system has been introduced, and the hovercraft navigation gas-liquid medium effects simulation framework and a simulation approach based on the fluid particle hovercraft using motion equations and stochastic equation technology system have been put forward. The simulation results are consistent with the fluid shape characteristics, the scope and aerosol spray random motion characteristics, when the air-cushion vehicle is sailing, and can realize the visual effect of aerosol and water spray the hovercraft generated when navigating fast and realistically.

Abstract: Through analyzed the cleaning process of rear rolling type sweeper, the theoretical model of waste particle trajectory was established during the sweeper working process by using the contact theory of modern contact dynamics, and the ideal theory track of waste particle was simulated and optimized by using MATLAB. The three-dimensional solid model of the working device was created by using UG software, and virtual prototype model was completed by using ADAMS software, and rigid brush was replaced by neutral file with brush features characterize that was generated by finite element analysis software, and contact relationship of waste particle during the working process was added by ADAMS contact order, and rigid-flexible coupling virtual prototype system was completed and kinematics simulation was run. Finally, compared the trajectory curve from ADAMS simulation with the theoretical path from MATLAB, the Theoretical model was proved correctness. The theoretical research and simulation analysis was made test and verify each other. Facilitate the development of the same type of products.

Abstract: The finite element software ANSYS is applied to optimize the front supporter of the concrete mixer truck. The main goal of the optimization is to reduce the quality. The statics analysis and the modal analysis of the front supporter are performed in the most dangerous work condition. The results of the two analyses are combined to explore improvement methods. Then, the topology optimization is performed to propose and establish the final shape and parameterization model. Finally, the multi-objective size optimization is performed to obtain the best optimization result. The maximum equivalent stress has reduced by 7.5%, and the quality has reduced by 13%.