Applied Mechanics and Materials Vols. 215-216

Abstract: Based on the analysis of hydraulic support design variables, a set of hydraulic support mechanism optimization design system has been developed with VC++ language. Design optimization of hydraulic powered support system instead of manual design and greatly shortened the design cycle and improves the accuracy of the design. This paper also analyzes two structural dimensions of the four linkage structure-the horizontal distance and vertical distance between the lower hinge point on the base of the front connecting rod and the rear connecting rod. By the analysis size range of the two structural dimensions has been found. It is Very valuable for designing hydraulic support.

Abstract: In roller bearing reformation of a medium scale mill, the micro-dimensional theory of mill is adopted. A new space self-alignment roll system is developed, including a divided base. This ensures the statically determinate of the mill under both light duty and heavy duty conditions. So the load distribution of roller bearing can be improved, and the bearing will have a long life. Since the new roll system began to run, it is in a fine motion until now. The roller bearing has exceeded its specified life. The design aim of service longevity is realized.

Abstract: In order to reduce the weight of harmonic drive (HD), the total volume of flexspline and circular spline was formulated and used as an objection function. Under the constraints including the condition on the strength of flexspline, the condition on averting the tooth top interference, the condition on the transmission ratio of HD and the geometrical constraint conditions of flexspline, a design optimization model with mixed discrete variables was established. For directly applying the optimal design solution of flexspline to manufacture, a manufacture-oriented method for dealing with mixed discrete design variables was used and the established model was solved by using an improved compound genetic algorithm. An optimal design example of flexspline was given and it shows that the proposed method is practical and effective.

Abstract: In order to reduce casting defects and improve casting quality, the author has developed a three-dimensional parallel vibration casting machine based on parallel mechanism. The paper introduces the three-dimensional parallel vibration casting machine in structure composition and functional properties, the casting machine degree of freedom of excitation mechanism is calculated, its motion performance is analyzed, and the kinematics equations are established. The designed casting machine achieves support and excitation functional separation of moving parts which takes complete decoupling of hybrid mechanism 2PRRR-P (2R ) as excitation mechanism, realizing flask vibration along the X, Y, Z three directions. Test results show that, the casting machine can significantly improve casting quality, raise labor productivity, save casting raw materials, and reduce the production costs.

Abstract: Rotary Wheel is important component of the tire testing machine. The natural frequency of the wheel will be determine by it's structure, and these concern the performance of the tire testing machine. Through model analysis a reasonable structural style of the wheel was determined. Dynamic property of the wheel affected by structural parameters was also discussed in the paper. From the Analysis above reasonable parameters of the wheel were determined and sufficient natural frequency was ensured.

Abstract: In order to solve the problem of blurry sight made by rain drop on the rearview mirror on rainy day, a rain-removing device making use of piezoelectric vibrator is put forward. Design the structure of the rain-removing device, build its finite element model and modal analysis for the piezoelectric vibrator is done. Piezoelectric rain-removing device prototype is manufactured and amplitude of the mirror is tested with different voltages and frequency. At last rain-removing effect for the rear mirror is measured with varies of angle at which piezoelectric vibrator is installed. The proportion of the removed rain drop is 80% when piezoelectric vibrator angle is 60° and the voltage and frequency on the piezoelectric vibrator is100V and 800Hz respectively.

Abstract: To model one bus body based on shell element and put it into the finite element analysis ANSYS made the mechanics analysis Using Pro/e software. Exert bending, reverse load, etc and done the operation and calibration. Through to adjust body structure balanced each part stress of the body. Analyzed data and put forward reasonable improvement scheme for restarting the optimization design. Got the purpose of the Body quality being light with high strength, the material effective utilization rate dramatically been improved.

Abstract: Aiming at the existent resource constraints problems during the assembly process of complex electromechanical products, mission planning method based on design structure matrix is put forward. Utlizing the divding and uniting calculation in the design structure matrix, the assembly missions are divided into several different layers. By constantly adjusting the planning method, the shortest excutive construction period under the resource constraints is obtained, with features as simplicity, intuition, easiness for computer realizing and so on. The feasibility of the method is proved by solving the assembly mission planning problems of NC machine.

Abstract: The role, principle and characteristics of the rubber chain attached board used in steel wire knitting machine were analyzed in this paper. A new kind of attached board with reasonable structure was designed through comparison of several design schemes. Eventually, through finite element analysis and size optimization design based on Workbench, the structure size of attached board was optimized and the whole strain, the maximum equivalent stress and the minimum safety factor were calculated. At the same time, new design ideas are also provided for the development of steel wire knitting machine to save materials and reduce cost.

Abstract: Locking function of a mechanism plays a significant role in safety and reliability. The operating principles of over-center locking in typical mechanisms and influencing factors of reliability to mechanism over-center locking were illustrated. A universal reliability analytical model of over-center locking mechanism was built and the algorithm of over-center angles was proposed. The result shows that in a planar four-bar mechanism, the dimension of driven link and variation coefficients have prominent influence on the reliability of over-center locking. The models and methods proposed in the paper could provide helpful reference in designing over-center locking of mechanisms.