Advanced Materials Research Vols. 433-440

Abstract: This paper investigates a design optimization for "Bone Plate System" which can directly fix human bones fractured. The active trauma system consists of several shaped bone plates and implant screws for fixation of fractured human bones with various manual instruments allowing to handle them. The material corresponds to titanium because it was well known as harmless material when being inserted into human body. This system has to be suitably rigid as well as manually bended in orthopedic surgery operations. Then bone plates have to be designed with suitable shapes. In order to verify whether bone plates were well designed, a series of bending tests. However optimized shapes of bone plates have to be determined before unnecessary a number of bending tests. For this purpose FEM(Finite Elements Method) was applied during design process which allows us to investigate the bending strengths of bone plates. Based on FEM results, dimensions of bone plates were optimized in order to be suitably rigid without actual bending tests.

Abstract: This paper presents a new structure of slip-stick positioner with a high bearing capacity, which is designed according to the requirement of nano-manipulation in the Scanning Electron Microscope (SEM). In addition, to analyze the performance of the slip-stick positioner, a dynamic model is developed in MATLAB/Simulink. The experimental results demonstrate the excellent performance of this positioner and especially its bearing capacity can be up to 400g.

Abstract: Setting of process variables to meet a required specification of quality characteristic (or response variable) in a process is one of common problems in the process quality control. But generally there are more than one quality characteristics in the process. In these situations, to obtain a satisfactory compromise in such a case, a decision maker (DM)’s preference information about the tradeoffs among the responses should be considered. In some cases, it is difficult for a DM to express an explicit approximation of the preference function. Therefore it can be effective to allow the decision maker to choose from a set of solutions. To this end, an algorithm is used to determine a representation of the nondominated solutions set. Such methods incorporate a posterior articulation of preferences. This paper proposes a posterior method based on taguchi’s signal-to-noise (S/N) ratios to facilitate the preference articulation process and incorporate both systematic and random deviations from target in a single criterion. Finally, the VIKOR method is used to extract of optimal compromise solution that leads to minimum variation in relative deviations of responses.

Abstract: We present in this paper an method for evaluating the reliability in real time applied to the optimization of preventive maintenance and evaluation of the parameters of dependability. This approach is based on a function Z (t), which assesses the damage from the history of real operating conditions. This assessment is used to calculate the residual reliability, and can then be used to optimize the preventive maintenance and in particular optimize the time between overhaul (TBO). This approach can be used to take more realistic decisions about preventive change and thus led to a better risk management.

Abstract: Aiming at the evalution and selection of multi-process plans in CAPP, a general kind of fuzzy comprehensive evalution is proposed according to the principle of fuzzy consistent relation and fuzzy consistent matrix and the correlation of gray system theory, and detailed evalution step is given. Three kind of the process plans are evaluated with the method of fuzzy comprehensive evaluation. The fuzzy synthetic estimation module is founded based on the product quality , manufacturing cost and production cycle. It has been adopted to cases in production and has realized the optimization of process schemes in CAPP.

Abstract: Computer-aided ergonomics design (CAED) is the combination of several academics knowledge, which includes computer engineering and technique, man-machine engineering and dynamics. In the paper, computer-aided ergonomics design technique in industrial product design is presented. Then, the structure of computer-aided ergonomics design technique in industrial product design is given and the application of the computer-aided ergonomics design is presented in the study. Simulation evaluation for design project in the front period can shorten the period and cost from design to manufacture and reduce the time of designer. The experimental results indicate that computer-aided ergonomics design technique in industrial product design proposed in the paper is feasible. Therefore, computer-aided ergonomics design technique in industrial product design has widely application space.

Abstract: In order to enhance the working performance of micro-capacitive accelerometer in high temperature environment, the structure topology optimization of a micro-capacitive accelerometer is proposed. After the study of thermo-structural coupled governing equations and sensitivity analysis, the mass-block and elastic-beam structure of comb micro-capacitive accelerometer topology optimization model is established. Then the optimal topology forms of mass-block and elastic-beam structure are obtained with the MMA (method of moving asymptotes) method. At last, the calculating results indicate that the maximum deformation at acceleration detection direction is only 22nm at the operating temperature range of 0~300°C, which less than the maximum deformation of the limit value (25nm), and provides a reliable way for innovative design of micro-capacitive accelerometer.

Abstract: During space capture process, because of the joints flexibility and the distortion of long tubular booms, high precision tracking and positioning performance of large space manipulator can hardly be achieved. As a result, it is difficult to realize successful capture. To solve this problem, a typical kind of netting interface fit for space capture application is introduced to improve the capture ability of the end effecter. Moreover, an equivalent capture strategy is put forward to avoid the complicate modeling problem of the unknown correcting force that acts on the grapple of the target during capture process. The proposed strategy makes the complicate capture problem to be a simple position tracking problem, thus capture can be achieved even a relative velocity exit between the end effecter and the target. Experiments show that the proposed strategy can improve the autonomous capture ability of the large end effecter.

Abstract: In order to set up a controller of good dynamic response for the laser tracking system, special requirements of laser tracking system to its controller are analyzed in this article. One is exact position track and the other is rapid and steady speed response. The overall design strategy of the control system is put forward on the condition that the startup torque and Coulomb torque difference a lot and the system works at relative low speed (typically -10rpm to 10rpm). It is pointed out that the PWM method is effective to reduce system startup torque and increase steadiness of startup. In position loop a fuzzy PI controller is designed to decrease the position overshoot to 1.5mm and increase the smoothness of the tracking. The experimental results show that the tracking control system can accurately and rapidly follow movement of the target.

Abstract: Logistics supply chain system management is the integration of key business processes from end user through original logistics suppliers that provides products, services, and information that add value for customers and other stakeholders. Due to the emergence of the global economy and intensified competition, many modern firms in the industry have recognized the importance of managing their logistics supply chains for fast product introduction and service innovations to the markets since the introduction of the term logistics supply chain management. For improved competitiveness, many modern firms in the industry have embraced the logistics supply chain management to increase organizational effectiveness and achieve such organizational goals as improved customer value, better utilization of resources, and increased profitability, through suitable design and effective operating of logistics supply chain system.