Applied Mechanics and Materials Vols. 385-386

Abstract: A new type of 2880 t ^* m double rotary chassis structure of railway crane was studied by using ANSYS software in this paper. On the basis of the overall modeling, the way of coupling is proposed creatively by taking into account the support cylinder, the chassis and the tradition of the leg, the research reference for the new type of large tonnage double rotary rail crane chassis structure was provided by using APDL language in rotary bearing load when it was carried out on the variable load, and constraints under the support cylinder surfaces move all degrees of freedom. Optimization theory for chassis of various dangerous conditions to make optimization analysis was proposed respectively by using ANSYS software. The problem of localization of double rotary rail crane was solved by checking all conditions after comprehensive round ,which was designed to save material double rotary rail crane chassis structure and taking the eigenvalue buckling analysis method to check the stability of the chassis.

Abstract: The existence of boundary condition and friction are difficult to predict which makes the sliders contact situation extremely complex. The actual response of the contact region becomes a tough research by using traditional method. Taking the cylinder supporting function into account, the polygonal and similar-oval Jib models are established. Research of the stress distribution and the stress concentration phenomenon is analyzed. The results indicate that stress distribution of the sliders of the similar-oval Jib is more uniform in comparison with the polygonal Jib that it can ameliorate the stress state of the contact region and enhance the partial stability of the Jib.

Abstract: Taking a special vehicle vibration system as the research object, according to the actual structure of the chassis, the spring damping and stiffness of the nonlinear characteristics and the tire vertical elastic accounted, a nonlinear vibration model of special vehicle based on dual-mass-system is set up. The tire radial stiffness value is analyzed in Ansys, a simulation is performed by leading the mathematical model of suspension system into Adams, a characteristic curve of stiffness and damping of suspension system is obtained.

Abstract: The hydraulic cone valve is an important basic component in Fluid drive and control technology. Characteristic of cone valve inner flow filed influences directly the valves performance. Especially when fluid flow in runner is turbulent, characteristics of flow field have great influence on the valves working performance.Main work of this paper is numerical calculation and simulation of cone valve inner runner flow field inside hydraulic hammer. First make a 3D modeling for cone valve using Pro/E, by fluent this paper analyses and discusses the distribution of hydraulic cone valve internal flow field including flow velocity field, pressure field and flow, etc when the cone valve core taper angle is 30°, the gap is 0.5 mm, and inlet velocity is different, analyses position and strength of the vortex, and finds out the main reason for energy consumption.The results of the study show that by the optimal design of the cone valve seat, the density degree of the flow and the size of the vortex is reduced, the energy loss is reduced, negative pressure zone also changes, the noise is reduced and the energy utilization is improved.

Abstract: The hydraulic poppet valve is an important basic component in Fluid drive and control technology, whose characteristic of the inner flow filed influences directly the valves performance. The main work is numerical calculation and simulation of flow field inside the cone valve in the hydraulic hammer. The first step is 3d modeling of cone valve. By using fluent software the study analyses and discusses the flow field of hydraulic cone valve including flow velocity field, pressure field and flow line distribution when the valve cores cone angle is 30°, analyses the cause of the vortexes position and strength, and finds out the main reason causing energy consumption.The results of the study show that by the optimal design of the cone valve seat, the density degree of the flow and the size of the vortex is reduced, the energy loss is reduced, negative pressure zone also changes, the noise is reduced and the energy utilization is improved.

Abstract: Based on the Orowan unit pressure differential equation, a vertical-horizontal dynamic rolling force model of workpiece was studied. Then, considering the influence of the rolling mill structure, the vertical-horizontal coupling vibration dynamic model of mill rollers was estabilished. The parse approximation solution of coupling system were carried out by using multiple-scale method, and the equations of amplitude frequency were obtained. Finally, the computer simulation analzed the characteristics of the system in different parameters, which can supply theoretical bases for suppressing vibration of rolling mill.

Abstract: To meet the need of an open type of 140t hot-metal-car for improving design, the analysis model of the main parts was built up by using Pro/E software, and the moment of inertia of each component was calculated.Then the Pro/E model was imported into ADAMS/Rail for assembling to finish a hot-metal-car dynamic model. The possibility of derailment and the wheel/rail abrading were simulated and analyzed on the hot-metal-car. The result of analysis provides theoretical foundation for improvement design.

Abstract: Naval gun guided projectile is an important direction of the development of naval ammunition, which can effectively enhance the capacity of firepower support and anti-missile. Penetration damage of naval gun guided projectile to typical anti-ship missile in proximity mode is researched in the paper. Damage of the two different damage elements (fragment and discrete rod) to warhead cabin of missile is simulated with ANSYS/LS-DYNA finite element analysis software and analyzed. Its useful to the study of the further model of vulnerability analysis of whole anti-ship missiles and offer theory reference to enhancing the damage effect of naval gun guided projectile.

Abstract: The lifting mechanism is the key to the standing recovery bed, moreover, the coordinates of hinge joints of lifting mechanism is the difficulty in designing the mechanical structure of standing rehabilitation bed. In this paper, it mainly illustrates numerical analysis of hinge joints with using MATLAB to solve critical parameter values, besides, as for optimizing the design of mechanism, it is necessary to analyze the trajectory of the mechanism and kinematic parameters and to verify the rationality of the design.

Abstract: With the rapid development of the automotive industry and sheet metal welding structure widely used in the production practice, study sheet structure welding deformation law and method of controlling the production practice has become increasingly important significance. In this paper, inherent strain finite element method is used for analysis of thin-walled box beam welding deformation. The use of different weld residual plastic strain inherent strain in ANSYS on distributed temperature load can be used to achieve different inherent strain value loaded. Thereafter, the calculation results and the test data are compared and found that this method can improve the calculation accuracy, and therefore have a certain effectiveness.