Advanced Materials Research Vols. 199-200

Abstract: A new method to evaluate design candidates in adaptable design of vertical grinding machines considering static and dynamic performances is introduced. According to adaptable design principles, the comprehensive evaluation method of dynamic and static performance was used to evaluate the value of structural change and performance improvement. Taking the redesign of vertical grinding machine for example, some design candidates were provided for its weak parts. Based on the evaluation method, the data on design candidates, which was derived from the static and dynamic analysis, was accurately analyzed and the design candidates were accurately and rapidly evaluated. Finally, the best configuration was selected.

Abstract: This paper proposes a procedure for obtaining the load distribution in a four point contact wind turbine blade bearing considering the effect of the structure’s elasticity. The uneven stiffness of the rings and the supporting structures creates a variation with respect to the results obtained with a rigid model. It is necessary to evaluate the effect of the elasticity on the increase in the contact forces in order to be able to design the wind turbine blade bearing and the structures involved in the connection. A finite element model (FEM) has been created for the global model, having also represented the rolling elements and their contact with the raceways. The results obtained using the FEM have been compared with the traditional Hertz contact results.

Abstract: There is currently no relevant national design standards about mast crane, so there are many of its non-standard design and a variety of forms and no attention is payed to the rationality of the design. Therefore, optimal design of the mast crane steel structure has a significant meaning for design technology of mast crane. This paper refers to a kind of parametric optimization model based on Ansys OPT, combined with finite element analysis (FEA) and stability theory. The building process and the program structure of the parametric optimization model is introduced. Corresponding program is developed by using ansys parametric design language (APDL) , which extract some parametes from FEA results, such as weight and axial force, etc, and rapid optimization design of mast crane is realized. It has a referenced meaning for optimization design of steel structure of all types of mast crane.

Abstract: Based on the principle of Space Mechanism, the kinematics model of 6-DOF transportation vibration platform is described, and system kinematics analysis and calculation are finished. With an example, the displacement of actuator is solved according to the position and orientation of moving platform. The kinematics analysis is the basis of deciding system motion parameters, motion trajectory planning and system dynamics analysis.

Abstract: Ship shafting is a key component of ship power plant. Torsional vibration test for ship shafting is the essential step to ensure the safety of ship power systems. For the purpose of analyzing and comparing torsional vibration test methods, a study of the test methods, equipment and technology is carried out in this paper. Three different test methods are compared with each other by adopting two different test systems. The main propulsion and marine generator shafting torsional vibration characteristics are analyzed by using two different analysis methods respectively: the single order and resonance point method and the multi order and resonance point method. The results obtained in the process of testing on board ship may provide a good guidance for the further researches in this subject.

Abstract: A quantificational calculation method of participating mass of foundation vertical vibration is presented in this paper. Vertical subsoil participating mass of strip and rectangular foundation are preliminarily calculated based on Boussinesq’s solution of subsoil additional stress and equivalent-load method. That is, the subsoil participating mass can be calculated only prescribing the isoline of additional stress. The method is suitable for adopting by corresponding codes for it avoids considering complicated influencing factors of subsoil.

Abstract: According to active vibration control of the large spatial structure, a vibration control device called giant magnetostrictive material actuator was designed which could convert electromagnetic energy into mechanical energy. This device take giant magnetostrictive material as the core component and make full use of its magnetic properties like big force output, fast response, high reliability and low driving voltage. Then its principle and design method was analyzed, and output performance tests were done. The results show that this device have good magnetic circuit structure, high efficiency of energy conversion, and could output larger force and displacement under the drive current with linear relationship sensitively, and lay a good foundation for its application in the large spatial structure.

Abstract: We should clean the internal residual hydraulic oil after the automotive power steering units are carried out performance test according to the requirements. In the sake of pumping more residual hydraulic oil efficiently we develop the special pumping unit Based on the orthogonal test, the optimal design of the main parameters pumping unit of automotive power steering units that is the first adding gas time, adding gas interval and adding gas time has been completed in order to determine the optimal program to achieve the best pumping effect.

Abstract: The expression of NAVMI factor and the natural frequency of a circular plate, which is placed in a hole of an infinite grid wall with one side exposed to water, are derived from the viewpoint of the additional mass. 10 Nodes Gauss-Legender integration method and the iteration method are employed to obtain the numerical results of the NAVMI factors, AVMI factors and the natural frequencies. It can be found from the results that NAVMI factors of the first two order modes are far bigger than those of the other modes when the boundary condition of a circular plate is certain. The first two order modal NAVMI factors of the circular plate with clamped and simply supported boundary conditions are far bigger than those of the circular plate with free-edged boundary condition, and the NAVMI factors are almost the same for the three order or much higher order modes regardless of the boundary condition. It is also observed that the natural frequencies of the circular plate exposed to water are smaller than those exposed to air, and the natural frequencies of the circular plate exposed to water with both sides are smaller than those of the circular plate exposed to water with one side.

Abstract: In this paper, the Φ3.8×13m centre drive ball mill is studied. After predigested the rotator with its mean characters, the FEM model of the rotator is established. After loading and solving to the rotator with FEM software ANSYS, the former ten modal natural frequencies and vibration modes are got. Through the modal analysis, the position which may be easily destroyed is found. Then the position of the partition board is moved, through the comparative analysis, a good project is carried out. The vibration modes are lessened, most of the vibration amplitudes are reduced, the vibration mode which has huge influence to the structure is avoided, and the dynamic performance of the rotator is improved.