Yong Hou Sun

OptiStruct Application in Optimization Design of Car Cabin Front Suspension Bracket

Abstract. Car cabin front suspension bracket (CCFSB) plays a supporting role of cab which connected cab cabin and chassis parts. In the conventional design, CCFSB is large and heavy usually to ensure its design strength. Therefore, structure optimization design is becoming the focus on the design of CCFSB. To solve the problem, this paper presents a structure optimization design method of CCFSB based on HyperWorks. The “Analysis-OptiStruct-Refine-Analysis-Contrast” method is proposed to realize the structure optimization. By the process of “meshing-loading- calculating- view of results”, the result of structure optimization of CCFSB is got which shows materials distribution. Trough taking OptiStruct optimization, the weight of CCFSB is reduced about 39% but stiffness is increased. The performance of product is improved and the cost is reduced greatly.

Research on the Evaluation of Plane Orientation Error Based on Uncertainty Theory

Based on coordinate measuring machine (CMM) the given part is measured in any orientation, and then the least square evaluation mathematical model of plane orientation tolerance is established. What’s more, the uncertainty evaluation method of orientation error is proposed according to the uncertainty theory of new geometrical product specification (GPS). The face-to-face angularity is taken as the example to present the effectiveness of the proposed uncertainty evaluation method. The result shows that the uncertainty evaluation method not only meets the requirements of new GPS standard, but also ensures the integrity of the flatness inspection results. As a result, the accuracy of the workpiece inspection can be improved.

Thermal Characteristics Analysis of Mill Head of Five-Axis CNC Mill Machine Based on Finite Element Method

Machine tool is the foundation of manufacture，then, five-axis CNC machine is the sophisticated equipment of CNC machine. During the practical work，there is an thermal deformation in a CNC machine because of many kinds of heat sources . This deformation affects the relative displacement between the work piece and the cutter, caused the manufacturing errors, and influences the machining accuracy of the part. So is of great importance to research the thermal characteristics. In this paper, thermal characteristics of CNC milling machine are simulated by analyzing the thermal boundary condition and using the finite element software-ANASYS Workbench. Get the temperature field cloud picture of A/C axes bi-rotary mill head of five-axis CNC machine. Weakness of Thermal Characteristics will be found out. This research provides the theoretical fundamentals for improving the accuracy of the mill head.

The Assessment of Line-to-Plane Perpendicularity Error Based on Particle Swarm Optimization

Perpendicularity error has great influence on the quality and performance of the geometrical products, and it is of great importance to guarantee the interchangeability. Particle swarm optimization (PSO) is an extraordinarily useful intelligent optimization algorithm with several advantages of fast convergence rate and easy realization for computer in the multidimensional space function optimization and dynamic target optimization. As a result, it is very accurate and is accordant with the requirement of minimum zone method (MZC) using PSO to associate the base plane of perpendicularity error.

Parameter Transfer Method of Mixed-Language Programming

The mixed-language programming is using two kinds of programming language or more to develop application. During the process of handling many engineering problems, the complex computation is often needed. So the method of mixed-language programming is often used in developing project software. MATLAB is high-performance numerical computation software, and VC++ is a considerably mature application development platform. They are often use in mix programming. During the process of VC++ and MATLAB mixed-language programming, when it calls algorithm function written in MATLAB in the VC++ environment, sometimes the parameters could not be easily passed to objective function. In this paper, a method resolving the parameters transfer of objective function is proposed. That is in the declaration of algorithm function canceling the objective function as one of its parameters, and adding the parameters of the objective function to the parameter of the algorithm function. Finally, a case of parallelism error evaluation system is given to illustrate feasibility of proposed method.

Component Variant Design Method Integrating Dimension and Tolerance

Product variant design is one of the key technologies of Manufacturing Enterprise for responding market demand. During the product variant design, tolerance variant design plays an important role. However, tolerance variant design is considered rarely in the researches of product variant design. To solve the problem of tolerance design in product variant design, a component variant design method integrating dimension and tolerance is presented in this paper. The fundamental and implement of component dimension variant design is introduced. Through analyze the conventional tolerance design method; the status for tolerance variant with its implemental dimension is marked as fixed tolerance value, fixed tolerance grade and tolerance value variant with special regular. The equation of dimensional tolerance variants with the value of implemental dimension is presented. So the procedure of component variant design method integrating dimension and tolerance is proposed. Finally, a case study of output shaft of reducer illustrates the implemental process of proposed method. Result comparing with conventional method shows effectiveness of proposed method.

Garbage Crusher Variant Design Based on Parameterization

Garbage processing is an important content in environment protection.Garbage crusher plays a key role in garbage processing. To enhance design rapidity and quality of garbage crusher, a new garbage crusher variant design methodology based on parameterization is proposed. The principle of variant design based on parameterization is introducted. Parametric model of garbage crusher is established and analyzed. A new product information model is established according to the mating relationship type among constituent parts of assembly. The product information model included several sub-models. It can be droved by parametric dimension, which is defined by customers’ requirement to get customized product’s design scheme. Garbage crusher variant design plug-ins based on SolidWorks is developed with VC++. The garbage crusher’s variant design is implemented.

Cutting Part Research of Machine for Cutting Mulberry Branch

Cutting part is a key part of machine for cutting mulberry branch. The cutting part structure could influence quality and efficiency of machine for cutting mulberry branch, directly. To obtain a suitable cutting part structure, research of cutting part of machine for cutting mulberry branch is implemented in this paper. Firstly, the stress situation of mulberry branch is analyzed through different cutter blade shape. A kind of cutter blade shape is got from the analysis result. Then this kind of cutter is used to build a cutting model. The cutting model is used to make dynamics simulation for the cutting process and analyze the cutting process through the ANSYS/LS-DYNA software. The curve figures got from the simulation result also provide certain reference for the design of cutting part.

Optimization for Powertrain Mounting System Based on Theory of Energy Decoupling

Comfortableness of cars is influenced obviously by engine vibration. Aiming at the vibration problem of passenger cars, this paper presents an optimal method for powertrain mounting system which bases on energy decoupling method. Firstly, a six-freedom dynamic model of powertrain mounting system of passenger cars is established. Then, an optimal process of mounting system is conducted by using the theory of energy decoupling with maximizing decoupling rate of the six-freedom mounting system as objective. The theory of energy decoupling and the elastic theory are applied to optimize the design of powertrain mounting system in Matlab software. Powertrain mounting system is implemented by ADAMS software. At last, optimal results of Matlab and ADAMS are compared. The comparison results illustrate effectiveness and rationality.

Measurement and Evaluation of Angularity Error Based on Coordinate Rotation

Angularity is an important parameter to evaluate the position precision. According the new generation of GPS, a new method of evaluating plane to plane angularity error based on coordinate rotation was proposed. In the process of evaluation, first the datum plane is associated by the minimum zone method; and then the datum plane is transformed into the ideal coordinate system plane. Based on the ideal datum, the plane is obtained by coordinate rotation; angularity error value is the maximum distance subtracts the minimum distance that measured points to the plane. The measurement for a V-groove in arbitrary position is performed on a three dimensional coordinates measuring machine; the result shows that angularity error can be evaluated effectually and accurately using this algorithm.