Applied Mechanics and Materials Vol. 835

Abstract: The bus is a vehicle for transport the passenger to the destination safely. The bus manufacturing is produced directly from the company and the bus has been modifying from the bus garage. The Bus modify into popular use in the domestic because it is cheaper. The modified bus is also a safety issue because these vehicles to the tilted test 30 degrees most of the test is not passed. The center of gravity is influenced to the stability of the bus. Which the Company or modify bus garage can not know the position of the center of gravity in advance. When the bus is used to build a center of gravity located in improper placement. Hence, the test does not pass 30 degrees tilt.Which required costs to adjustment and test again. This paper was intended to study the variables that affect the center of gravity of the bus include engine placement, adjustment pressure into air suspension before build bus body, bending chassis, characterized by mounting to the chassis frame. Studies using instruments find the center of gravity of the bus used computer simulation center of gravity nearby real bus. The variable adjustment in order to design a bus with the appropriate center of gravity. Research has found that different variables adjustment engine placement characterized by mounting to the chassis frame have an affect to bending chassis relate to the center of gravity change, Therefore, the variables to be optimized, it is possible to design a bus safety.

Abstract: One pumping unit corresponding to one well is the principal oil production pattern for cluster well at the present time. When oil exploitation comes into mid-later period, reducing of permeability will result in falling of oil output and production efficiency as well as increasing of energy cost. Therefore, the production pattern of one well-one pumping unit has been unsuitable to satisfy the demand of cluster well production technology. This paper presents a novel cluster well pumping unit based on slider-crank mechanism. Well load pairing balance way was adopted in our design, and therefore the weight of pumping unit drops greatly. A dynamics model of the unit was established, and contrastive analysis with the beam pumping unit was performed. At the present time, the practical prototype has been used in Chinese oil field and it runs efficiently.

Abstract: Research based on ultrasonic surface treatment (UST) shows that the operation is beneficial to tribological properties and fatigue life of mechanical structures by enhancing the surface mechanical properties, such as roughness and residual stress, through changing nanostructure induced by severe plastic deformations on the surface. The amplitude of the vibration at the processing end is essential for the treatment effect. This paper presents a way to design an UST device that can control the amplitude and vibration mode.

Abstract: Results of a computer simulation and experimental study are presented for a fiber sensor based on a Saint-Gobain Crystals BSF-60 scintillation fiber which was used to measure the activities of sources of ionizing radiation. The simulation was based on the Monte Carlo method and the Geant4 software code and was applied to calculate the dependence of the number of beta-electrons entering a BSF-60 scintillation fiber on the activity of radiation sources based on ⁶³Ni, ⁸⁹Sr and ⁹⁰Sr isotopes. An experimental study of the sensitivity of the developed fiber sensor and the measuring system to beta-radiation of ⁶³Ni, ⁸⁹Sr and ⁹⁰Sr isotopes showed a high degree of compliance with the proposed model.

Abstract: A high clearance self-propelled sprayer was designed, and a 3D model of sprayer frame was built with CATIA. Its finite element model was built by using Hypermesh, and it was imported to ABAQUS for finite element analysis. The analysis researched the stress and deformation of frame under four typical conditions of constant-velocity, torsion, emergency braking and emergency turning. The weak region of strength in the variable track mechanism was found, and a size optimization research was carried to the square pipe of the variable track mechanism. The result showed that the maximum stress of frame after optimization decreased obviously, and the distribution of stress became much more reasonable. The optimization ensured the reliability of the frame design.

Abstract: Multi-objective optimization method was adopted for obtaining appropriate dimensions of a new type of inner support in tire. Based on optimized inner support in tire with three monomer block components, finite element models were established by HyperMesh, and dynamic simulation on safety property was completed on LsDyna3D. For this type of inner support in tire, strength is enough during tire burst. After fatigue damage analysis, safety property of inner support after tire burst is well enough too. It is certain for the inner support to work well not only during tire burst but also after tire burst.

Abstract: An improved nonlinear vibration isolator is proposed in this paper. It uses the exact solution derived load-displacement hysteresis curve formula based on energy method to calculate disc spring, combined with the finite element analysis. The static load capacity and dynamic mechanical property of this new type disc spring vibration isolator is validated through the static load tests or fatigue analysis. Compared with the rubber vibration isolator, the conclusion can be found: the new type vibration isolator has wider scope of vibration isolation, and is better in low frequency vibration isolation. These research achievements are of significant importance in the vibration isolation of heavy load and great shock mechanical equipment.

Abstract: A 3D cell-based finite element model is employed to investigate the dynamic biaxial behavior of cellular materials under combined shear-compression. The biaxial behavior is characterized by the normal stress and shear stress, which could be determined directly from the finite element results. A crush plateau stress is introduced to illustrate the critical crush stress, and the result shows that the normal plateau stress declines with the increase of the shear plateau stress, which climbs with the increase of loading angle. An elliptical criterion of normal plateau stress vs. shear plateau stress is obtained by the nonlinear regression method.

Abstract: The low efficiency restricts the development of pulse continuously variable transmission (P-CVT) mainly, so it is an urgent task to reveal the physical essence of P-CVT, find out the main factor of energy loss, optimize the structure and improve the efficiency. In this paper for this problem, the energy model is established, proposing the calculation method of the energy loss in kinematic pair, the energy loss caused by the resistance of lubrication and the energy loss caused by the damping of the materials of transmission machine. And on this basis, the energy loss will be analyzed specifically by taking the Y2 P-CVT for example, pointing out the corresponding measures which can improve the efficiency. Finally, the physical essence of P-CVT is revealed. Therefore, this paper can provide theory for the efficiency analysis and optimal design of P-CVT.

Abstract: Recently, consumers are often dissatisfied with the battery life from even the most advanced lithium-ion rechargeable batteries in mobile phone. A mobile battery was chosen in this study because it is the flat plate of small thin wall which is expected to have some flexing. It is required to be evaluated and designed considering the coupled phenomena. Especially, this paper describes a meshless of element-free method based on fuzzy knowledge processing for battery of smart phone. Practical performance of the present method is demonstrated through heat conduction analysis.