Applied Mechanics and Materials Vols. 246-247

Abstract: Magneto-rheological grease attracts the attention as a new kind of intelligent material. Under the external magnetic force, it is difficult to use traditional mathematics model to solve and analysis internal structure because of its complexity and polytropy. The modeling and simulation for complex system using computer becomes a good way to investigate complex system. Based on the electromagnetic theory and computer simulation, this paper constructed the model of shear stress to describe the characteristic of magneto-rheological grease that is to use body centered cubic pillars model to analysis the mechanism and characteristics of magneto-rheological grease. Using matlab simulink toolkit to compose the simulation program, simulate and analysis using theoretic model, and plot the shear stress curve of magneto-rheological grease with magnetic strength and particle size, and the shearing force under zero field. The simulation and experimental results indicate that the simulated shear stress curve is coincidence with experimental curve when the density of ferromagnetic particle is low, and it is lower than experimental curve when the density is high (the variation tendency is close), which verified the accuracy of theoretical model. It needs to improve the model by considering the still friction between ferromagnetic particles.

Abstract: With the increasing of the number of cars, people are also getting higher and higher demands on the performance of the car, and especially pay attention to the improvement and optimization of automobile transmission system. The transmission is a key part of automobile transmission system, and transmission performance and stability depend on the synchronous machine, so in order to make the vehicle transmission system with higher efficiency, it is necessary to study the synchronous machine. On the basis of elaborating synchronous machine working principle, the use of dynamics theory to establish mathematical model of synchronous machine system, and to carry out the simulation of synchronous machine three-dimensional model in PRO/E environment, then the use of virtual prototype technology to optimize the parameters of synchronous machine, thereby improving the performance of synchronous machine.

Abstract: A Magnetorheologic fluid is a kind of intelligent material with high performance, its inductance has an important impact on its manufacturing and application, and thus it is important to investigate its inductance. This paper mainly introduced the method using labview to develop an experimental system to investigate magnetorheologic fluids inductance, and built such a system. It also discussed the composition and function, and designed the experimental procedures. We detected and analysis magnetorheologic fluids inductance under different conditions. This system utilized software to implement realtime sampling of time domain signals, display frequency domain signal and some other signal analysis function. Experimental results indicated that this system is feasible.

Abstract: Based on computer simulation technology, we put forward the shear stress model of nonspherical magnetic particle MRG, and take the hexagon form magnetic particle MRG as an example; this paper deduces hexagon magnetic particle MRG shear stress formula. The model simulate and calculate the relationship between shear yield stress and magnetic field intensity respectively when radius and side length is equal and when the volume is equal also shear yield stress in the zero field condition. The simulation results show that in the same volume condition the shear yield stress of nonspherical magnetic particle MRG is bigger than that of spherical magnetic particle MRG; the shear yield stress of nonspherical magnetic particle MRG cut down with contacting side length’s reducing but also greater than that of spherical magnetic particle MRG and this relationship is also the same in the zero field condition, so spherical magnetic particle MRG is not the best choice. Therefore, this research has an extremely vital significance for the development and application of high-performance MRG.

Abstract: For three-dimensional modeling of cam profile, we can draw the cam profile firstly, and then stretch it to form a three-dimensional graphic. When drawing, the difficulties exist in how to draw the two-dimensional graphic rapidly and accurately. Accurate calculations can be done with Excel. It will be a very good method to insert data to AutoCAD with required format to form the graphics. After forming the two-dimensional graphics, three-dimensional graphics can be done after several procedures. It is much significant for accurate drawing and CNC automatic programming processing for cam profile, and get high-accuracy plate cam.

Abstract: Currently, many designers for pipeline network, such as the municipal drainage pipelines, oil/gas transport pipelines, use AutoCAD to design their drawings which demonstrated in a 2D view. For professionals, it’s easy to view and modify their design. But for common users who usually have little professional knowledge on pipeline design, a 3D scene view is more intuitive. To this end, we propose the architecture and implementation of pipeline network information that has facilities such as reconstructing the 3D scene of a pipe network from 2D AutoCAD files (.dwg files).

Abstract: Aiming at the maneuvering training character of hovercraft, a visual simulation system is developed based on EPX-500 IG(Image Generator), and core-technology research is made, include the production of high revolution land database, simulation of sea waves and the detection of HOT(S) (Height of Terrain(Sea)) both on continent and sea surface. Consequentially gains the vivid simulation of hovercraft’s navigation scene, and the capability of real-time adjusting gesture of hovercraft in the motion simulation system module according to the response of the terrain.

Abstract: This paper mainly studies the technology of computer aided design in mechanical design application. In the three-dimensional spring parametrization design as an example, introduced the use of AutoCAD embedded Visual LISP development tools for3D parametric graphic design principles, processes and methods, introduction of computer aided design technology, reduces the design personnel repetitive drawing work, improve the efficiency of design.

Abstract: This paper describes the application of CAD-aided design technology combined with vb.NET development tools in the design of mechanical parts. To shafting parts design as the example, elaborated AutoCAD development technology in shaft parts of design methods and steps. Used Computer programming software for CAD secondary development to reduce the duplication of work of the designers, improve design accuracy and efficiency.

Abstract: It is necessary to study the dynamic characteristics of the structure of processing shaft cascade in high speed and high precision PCB drilling machine because of its great impact on the drilling precision. As a basic part, the dynamic characteristics of the structure of cascade depend on the dynamic characteristics of the Z-axis floor. Based on it, firstly, the free mode test is conducted on the Z-axis floor, the same as the modes that it is just set up on the guide rail, the cascade is added and the motor spindle has been added on the Z-axis floor. From the four situations, the modal pa-rameters are gained in the tests. Then the ODS test is carried out and the vibration is analyzed in the real situation. The vibration tests of the cascade comprehensively acquire dynamic characteristics from the Z-axis floor before being assembled to the Z-axis floor which is entirely cascaded on the Z axis. Acknowledge of the impact that the vibrations bring to the drilling precision of the drilling machine provides the direction of improving the structure.