Applied Mechanics and Materials Vols. 397-400

Abstract: In order to improve the structure mechanics performance of assembly body of conical pick, the finite element method was taken to analyse assembly body of conical pick based on rock cutting theory, and the distortion law of stress and displacement of carbide tip, pick arbor and pick holder were obtained. The results show that the maximum stress appearing in pick carbide tip and its weld site is 371MPa, maximum stress of pick holder appearing in its weld site is 157MPa. Consequently, the quality of the weld should be ensured in processing and manufacturing or welding installation to reduce the performance of carbide tip and pick holder drop. The maximum displacement of assembly body of conical pick is 1.14mm, which has little influence on the structure mechanics performance of assembly body. The research results could provide some guidance for designing, manufacturing or welding the assembly body of conical pick.

Abstract: Frame is the most important carrying structure for tricycle vehicles. A reasonable frame design can increase its service life and reliability. Firstly, the frame structural modal frequency should avoid close proximity of excitation values. The structural modal characteristics were analyzed and validated; secondly, the method of size optimization was applied to improve the structure modal characteristics while taking into account the sensitivities analysis, at last, the thickness of steel plate was optimized to achieve lightweight and increase unreasonable natural frequency. According to the results of recomputation, the structure characteristics had been ameliorated obviously, and structures weight was reduced.

Abstract: The damping effect of 485 diesel engine is taken as research object, on the same conditions, bench test is conducted respectively to self-developed MR fluid damper and traditional rubber damper, comparative analysis of domain and spectrum are conducted to collected test data using MATLAB, the results show that damping effect of MR fluid damper to engine is significantly superior to effect of traditional rubber damper.

Abstract: Thorax injuries are common in vehicular accidents, second only to head injuries. Unbelted drivers of vehicles are more likely to suffer thorax injuries from steering wheel contact in frontal impacts. The objective of this study is to investigate the effects the steering wheel tilt angle (0, 20, 40, and 60) impact to the thorax of human body model with respect to thorax deflection and steering wheel rim contact interaction. To understanding of the human thorax sensitivity to steering wheel tilt angle on the force and deflection response using finite element simulations. It was found that the thorax response is sensitive to changes in steering wheel tilt angle. The contact force, Sternal displacement were the key parameters to be observed and compared. The results show that the contact force increased when the steering wheel tilt angle was bigger, the response was quicker. Low steering wheel tilt resulted in greater deformation. The greater the contact force, the deformation of the sternum but reduced when thorax impact the steering wheel, According to ECE R12 steering wheel regulation ,use force regulations to assessment the injury of the thorax is not accurate enough when human thorax impact the steering wheel.

Abstract: A finite element model of a rolling bearing with ANSYS/LS-DYNA is bulit , considering pressure, speed, multi-body contact effects and constraints under friction. The movement process of the rolling bearing based on explicit dynamics is simulated successfully. Several relevant parameters of 6205 deep groove ball bearing are calculated and determined. The results show that rotational speeds of cage and rolling elements which get from finite element analysis are consistent with the theoretical calculated values and stress situations are the same as Hertz analysis solutions. It proves that the proposed model is effective, which lays a foundation for subsequent analysis and diagnosis for defected bearings.

Abstract: Based on the seat cushions in high-speed train, three main characteristic parameters, surface angle, width and height are involved in this simulation experiment analysis. With this CAE method, a standard buttocks model fit to seat cushion is imported, and the study on seat pressure distribution is taken through characteristic parameters of seat cushions related to different concave surfaces using ANSYS’s finite element analysis, and contribute to much flexible and more adjustable feature points, use seat pressure distribution to determine geometric parameter according to maximum pressure points, the result in this work finally satisfy the standard of optimization, and helps to assist reliability design of seats in high speed train.

Abstract: In this paper,a simplified model of the car with low resistance was built and 3D numerical simulations have been finished with two schemes adopted :the rough model and the smooth model of fenders and wheels. The aerodynamic characteristics and the flow field structure of the passenger car model were obtained with CFD, then the affect of the fenders and the wheels to the aerodynamic resistance were analyzed. Seen from the results, minor warping of the fenders and the sharp corner of wheels induce great energy loss, while smooth modeling of these two parts ensures the flow fluent, and decreases the C_D value. The aerodynamic characteristics and the results gained from this paper provide theoretical basis for the low-wind-drag car.

Abstract: The accident caused by the off-tracking of belt is one of the most common belt conveyor failures, and corrective device is very important for guarantying its safe operation. The method of establishing physical model and simulation of corrective device is described in this paper, and the problems that must be paid attention to by using software. The idea of dynamic analysis to test the effect of different corrective devices by using simulation software is proposed.

Abstract: Describe an advanced design and manufacturing technology Concurrent Engineering (CE) and give the automobile covering parts mould development flow basing on concurrent engineering. It tries to consider initially all factors of the mould development life cycle. Take an automobile covering part for example. Basing on the finite element analysis software AUTOFORM, do die design and forming simulation. According to the result of simulation, designer can predict the defect of forming and timely modify the forming process. So in stage of process design taking into account the blank forming, this kind of concurrent design of the mould surface can be directly used to mould design, also won't return after the mold design to modify the die-face design process. So on account of concurrent engineering, it can reduce the changes of automobile covering parts mould design and the number of repeated test, improve quality, reduce cost, and shorten the cycle of mould development.

Abstract: Lemniscate type crane is used for water transhipment operation. Lemniscate type crane has some advantages, i.e. lower centre of weight, practical and reasonable structure, strongly anti-wind, upwarp of flying jib invariably and easy operation. Based on ADAMS and MATLAB, the simulation of kinematics of luffing mechanism of lemniscate type crane with boom driving are obtained. Luffing characters of lemniscate type crane are more better and suited to handle materials.