Materials Science Forum Vols. 628-629

Abstract: The innovation of mechanism is essential to the creative mechanical design. The innovative design of mechanism not only has important theoretical academic values, but also has greater economic and social benefits. In this paper, we have conducted an innovative design on folding umbrellalike mechnism by using regenerated kinematic chain. This creative design is feasibile in technology, and is meaningful to improve the self-design of our mechanical products, the ability of innovation and internation空al competitiveness.

Abstract: Based on the thorough analysis of the disadvantage of the traditional calculation system for straightening force, the new calculation system for straightening force is built according to the analysis of roller-shaped curve, flattening straightening and bend straightening with the application of mechanics of materials and bend beam theory. It is testified by practical use that the calculating accuracy of the new calculation system for straightening force satisfies the actual engineering requirement. New six-rollers straightening machines are designed and manufactured according to the new calculation system, which obtain notable economical and social benefits.

Abstract: In order to assimilate and redesign the existing product, a conceptual design driven by function is proposed. Firstly, the behaviors, structures and functions of the product are analyzed in detail. Then bond graph models are used to describe the behaviors which indicate the dynamic performances of the existing product. Secondly, the advantages and disadvantages of the product can be revealed through these dynamic performances which are abstracted by simulating the bond graph models. To catch the intention of the original design, the simulation results are analyzed regarding the system dynamic performances. According to the evolutional routes, several redesign results are obtained by grouping some optimized alternatives. Finally, applying the method to a frictional driver redesign, the control and dynamic performances are both improved, which verifies the validity and practicability of the proposed design method.

Abstract: In many occasions of the practical engineering, the reciprocating rectilinear movement at high frequency is appeared commonly, which is usually completed by the slider-crank mechanism. But there has big friction force between the guide rail and the block, thus the big friction loss can be caused. So when working in a long time, the mechanism will be heated and distorted. And a big torque will be caused in the guide rail, the oscillation will be generated when move at high frequency. In order to overcome these defections, the reciprocating rectilinear moving mechanism at high frequency with low load driven by two symmetrical eccentric cams is innovated. And to realize the different travel in economical way, the rapid reconfigurable devices based on this mechanisum are innovated too. These innovated mechanism is quite symmetrical, so the friction force between the guide rail and the leader can be almost ignored and the oscillation is very small too. Then, the mechanical and movement property are analyzed and compared with the slider-crank mechanism, which proves that these mechanism have simple structure and good property. Through the analysis of the travel, the merit of strong adaptability is found out. Furthermore, the components in these devices can be reused in different occasions, so the reconfigurable thinking provides one economical method for big production rapidly.

Abstract: During product platform life cycle, innovation problem identification and decision-making are regarded as vital issues in product platform evolution process. The Comprehensive Disturbance Degree is proposed and analyzed considering customer demand, technology status and production capacities, then existing problems of product platform are identified. According to Innovation Problem Selecting Principles, the innovation problem set Q is defined. The value of modules in product platform is calculated using Value Engineering, the module set M needed to be improved is determined. Then based upon the correlation degree analysis of the innovation problem set and the module set, Fuzzy Clustering Algorithms is advanced to classify innovation problems. Finally, a case study is given to illustrate the validity of the methodology.

Abstract: A planar cam theoretical profile can be considered as cycloid of the roller center. There is singular point on the cycloid when the roller center is located on the instantaneous axis. Then, the curvature of the cycloid at the singular point is likely to be infinite and interference may be inevitable. Thus, avoiding such singular point is imperative in cam profile design. But, in analyzing the characteristics of the tangent vector and curvature at such singular point, it reveals that the curvature may be finite, even zero, if the cycloid fulfills some condition at the singular point. This leads to a very important property that at the singular point the tangent of the cycloid is parallel to the normal of the instantaneous center curve. The pressure angle is very small even zero. These results would be very efficacious in planar cam mechanism applications. The characteristics of singular point on cycloid are detailed in this paper. As application, a novel kind of parallel indexing cam mechanism is developed. Its configuration and principle are described.

Abstract: Empirical models, which are based on linear regression method, will enable the transfer of the quote experiences and knowledge hidden within company’s databases since the use of experts’ judgment is unavoidable for most manufacturing companies to estimate the product cost in the early phases of the design cycle. By studying many quote cases on medium and large size mechanical products and analyzing the relationship between costs and relevant structural variables, the empirical equations are mathematically modeled for modular products. With an H-frame hydraulic forging press example, the estimating process is implemented and successfully demonstrated.

Abstract: To target both present users and future potential customers, which are often ignored by most researches, very early in the collaborative conceptual design stage, a multi-agent framework is presented to integrate the distributed design activities. By introducing a cost-effective and timely modular design system and modeling its ‘users’, a typical intelligent and autonomous agent is constructed and the principle of cooperation among multiple agents is discussed for maximizing today’s and tomorrow’s customer requirements. The proposed system is successfully demonstrated on the hydraulic press products design.

Abstract: This paper describes an innovative free-form modeling system, Virtual Clay Modeling System (VCMS), in which users can directly manipulate the shape of a virtual object like a clay model in real world. With this system, some disadvantages of interaction with computer aided industry design (CAID) systems can be resolved. In order to enhance the immersion feelings and improve the controlling abilities to cut, paste, and compensate of VCMS, we use Spaceball 5000 and PHANTOM Desktop to assign the set of interaction tasks. During the process of realizing 6 degree-of-freedom (DOF) haptic feedback modeling control, we developed and accomplished the device interfaces with Open Inventor and Qt application framework. VCMS provides us a good immersion of allowing for effective modeling in a virtual world.

Abstract: Top-down design is an effective solution for global and local trade-off of color deigns process. Based on the characteristics of computer-aided color design (CACD), we studied the Ostwald Color Harmony theory and realized a novel method with computer-aided color harmony by the translation on the coordinate systems. Some key techniques, such as constructions on product color scheme database, mapping tree model and Top-Down Color Design Model (TDCDM) are elaborated. Finally, with the integration of CAXA solid design software, we implemented the computer-aided product color innovative design.