Advanced Materials Research Vols. 308-310

Abstract: The efficiency of the modeling method is the decisive factor for the success of generated innovative solutions, while existing modeling methods are usually based on the assumptions that many prior knowledge/information about the design has been acquired. A novel modeling approach based on living system theory is proposed and its detailed implementation steps are given, which provides an easy operating, complete information representation, and general-purpose decomposition mode for the functional design of mechanical product. Finally, through the application in the design of automatic packaging mechanism, the feasibility and efficiency of the proposed method is verified.

Abstract: With the rapid development of computer-aided design, traditional hand-drawn performance undergoes a fundamental change. Since it has the characteristics of a variety of vivid, fast and convenient, the computer-aided design has become a new desinging trend. However, while the computer brings us conveniences, it also has many negative effects. Many designers rely on the computer-aided design excessively, and ignore the hand-drawn performance’s special advantages of enlightenning creative thinking, emphasizing the personality performance, promoting computer performances, and improving professional attainment. In the informationlized computer age, in order to better reflect the design’s essential connotation, we only have to combine the hand-drawn performance and the computer-aided design together perfectly, and coordinated development of the two should be the orientation of contemporary design.

Abstract: Innovative mechanical design methods are categorized and analyzed briefly in this paper, which include the common used creative design methods for mechanical systems, mechanisms and mechanical structures. And the applications of these methods are illustrated with examples.

Abstract: Dynamic performance is one of the most important factors in the product’s life. Transmission housing is one of the important components in vehicle, which has direct influence on the vehicle’s powertrain performance. Dynamic topology optimization can improve the product’s performance. The dynamic topology model is built, in which the density of elements are the design variables, the displacement of frequency response and volume are the constraints, and the objective is to maximize the first natural frequency of the housing. According to the result of optimization, the CAD model of housing is rebuilt and the finite element analysis of the new housing is done.The results show that both the static and dynamic performance are improved besides the mass reduction, namely, dynamic topology optimization can significantly improve the product’s performance.

Abstract: The mesopic vision theory is used to study illumination properties of series of light sources, through the test of luminous spectrum and derivation based on the MOVE model, the results show that spectral luminous efficiency function Vmes(λ) is between traditional V(λ) and V′(λ) when the background brightness under mesopic vision condition, and the function of Vmes(λ) is changed with the different of light sources and background brightness. Based on human visual perception, the mesopic vision equivalent brightness can be calculated, which of HPS is lower than test brightness corrected by V(λ), but white LEDs and FL show opposite phenomena, and the different value between mesopic and photopic brightness presents reduce trend with rising of background brightness.

Abstract: TRIZ theory is a new method of creative design which provides systematic theory and tools for inventive problem discovering and solving. In this paper, physical contradiction solving principles is discussed and its application in armored vehicles is also presented to illustrate its significant value in engineering practical problem solving.

Abstract: To separate objects (immature tomatoes, foreign material) accurately from tomatoes using actuating mechanism of tomato color grading robot, high-speed photography was used to acquire images the tomato sorting process for studying effect between tomato cast position and track for separating. Test results show that tomatoes cast position affects tomato sorting; tomato track from conveyer belt affects the hitting position of pneumatic ejection finger directly. High-speed photography is used for tomatoes sorting process analysis at high speed, which can be helpful for design of tomato color sorting robot.

Abstract: In order to realize that an asymmetric flow piston pump can control an asymmetric differential cylinder, a proposal about the application of an asymmetric flow-distributing axial piston pump is put forward. The new type of piston pump can output the flows with two different values to control the movement of the differential cylinder directly in the closed circuit and realize much ideal result of the control of the differential cylinder by a single pump. Also a simulation model of the hydraulic pump is established under the circumstance of SimulationX software, considering the characteristics of the movement of an individual piston, the oil compressibility, and the flow distribution area changed with the rotation angle. The key data of the pump is defined by means of digital simulation. In particular, an analysis is made on the dimension of the unloading groove of the port plate and the characteristics of the flow pulse of the pump. Furthermore, an experimental model pump is manufactured, the basic performances of the pump is tested on the experimental platform at various rotatory speeds such as pressure, flow and noise, in the end the accuracy of the principle is verified.

Abstract: A method of design process reuse and optimization based on the design process gene is proposed to enhance design efficiency. First, the concept of design process gene is put forward and its structure is disclosed. Second, the design process gene is categorized into three types according to their different roles in expression regulation. Their functions are analyzed respectively as well as their interactions. Third, the principle and procedures of design process reuse and optimization based on the design process gene and genetic engineering is proposed.

Abstract: When the slot number of geneva is fixed, the kinematic coefficient of common geneva mechanism is a fixed value, too. Using the elliptic gear mechanism as the drive crank of the Geneva, the variable transmission ratio of the elliptic gear mechanism is utilized, which makes the kinematic characteristic of the geneva mechanism changed. A synthesis method of combined geneva mechanism is put forward according to the kinematic coefficients in this paper. The calculation methods of the maximum and minimum kinematic coefficient are proposed. The parameters of the combined geneva mechanism are presented, which the middle position of the kinematic range of the geneva has approximate constant velocity characteristics.