Advanced Materials Research Vols. 201-203

Abstract: Compared with hydraulic press, pneumatic press has many prominent advantages such as low energy consumption, no pollution to environment, fast speed and high efficiency etc. However, its critical disadvantage is that its pressure is much slower than that of the hydraulic system, which results in lower output force. An innovative pneumatic press driven by a new composite pneumatic-mechanical transmission mechanism is presented in this paper. With the aid of the force amplifier of two-step serial toggle-lever, the output force of the piston is amplified twice and the amplification factor can up to 20. Besides, two innovation design plans were discussed, namely, the single-cylinder-single-piston press and the single-cylinder-double-piston press. Moreover, the single-cylinder-double-piston press is remarkable in harmonious symmetry and technical performances.

Abstract: This article introduced a method of designing rear mounted fluid coupling transmissions for deceleration with heavy power, as well as innovation in its architecture and difficulty in manufacture. All of these are valuable for the designers and researchers in fluid coupling transmissions. On the other hand, we have combined finite element method and computer science in the stress analysis of pump wheel, which shows consistent result in the calculation and practical use.

Abstract: Modern mechanical products through comprehensive appraisal target analysis, adaptability of product evaluation model can be established. The NC Arc teeth gear milling machines, for example, applies multistage fuzzy synthetic evaluation methods, has carried on the synthetic evaluation to the product adaptability, provide the instruction for the modern structural design and the re-engineering.

Abstract: In order to solve the practical technology problems in the field of public video monitoring system engineering, in this paper, a real-time video transmission rate adaptive control programming in public video monitoring system is introduced. The system can monitor network congestion status according to the parameters such as network transmission time, transmission delay and data packet loss rate, and dynamically adjust the output rate of the video transmitter according to a certain algorithm of adaptive control of transmission rate, it has certain robustness, and improved the quality of video output. Experimental test results show that the contrast effect is better in reducing video packet loss rate, improving network bandwidth utilization or avoiding network congestion.

Abstract: A set of equipments for ship sewage treatment, which has been designed according to the characteristics of ship sewage with the advanced sewage treatment technique and the modern automatic control technique, makes ship sewage treatment miniaturized and automatized. The device takes biological method, + MBR Membrane Bioreactor, as the main treatment technique. After the reliability of the technique was justified through the simulation experiment, the mechanical structure of the equipment, including the detailed dimensions and relevant accessories, was designed according to the number of people. Besides, through PLC programmable controller the automatic operation and the automatic alarm have been achieved. As the result of the sewage treatment testing of the prototype, COD removal rate was above 92% , BOD5 removal rate above 98%, SS removal rate above 97%, the test value of heat-resistant Escherichia coli zero, totally meeting the IMO emission standards.

Abstract: Because of the chip breaker, the rake face of turning tool differs from one another. It is studied that different shape rake face have an important influence on sharpening intensity under the same rake angle in the paper, the results showed curved rake face is better to plain face. Otherwise because chip breaker is assigned to the rake face, the grinding is not only sharpened rake face, but also chip breaker is grinded too. How to ensure degree of finish and dimension of chip breaker sharpen is important, the corresponding method is introduced in detail in the paper.

Abstract: This paper proposes an approach of mapping semi-structured customer needs (SCN) into precise functional requirements (PFR) for Web-based product customization by integrating fuzzy set theory. The mapping relationship between SCN and PFR is discussed. Then a framework of the SCN mapping is constructed; and the methodology of implementation is presented in detail. Finally, an example of Web-based customization of pedal motorcycles is employed to illustrate the proposed approach.

Abstract: Improving the straightness accuracy of bending workpieces becomes an urgent problem for the development of bending equipment with large size and high precision. In order to obtain the characteristics of slider deformation, a three-dimensional finite element model was developed according to the mechanic characteristics of large-scale press brake and obtained the small deformation using FEM (finite element method). The numerical results are in good agreement with the experimentation. Then based on the simulation results we design a large-scale mechanical crowning system through which the press brake could be automatically compensated in the bend direction by means of a CNC (Computer Numerical Control)-powered motor and could also be compensated for local parts by adjusting the side screw nuts manually. The system has been successfully applied in production and its accuracy was increased 33% compared with the traditional ones. It is proved that the present investigation can provide a technical support and reliable system for the improvement of accuracy of the press brakes.

Abstract: The modular and scalable leverage planning for flexible platform is crucial for derivative product design. A multi-objective flexible platform leverage planning method with quantitative indices is proposed. Including customer requirement analysis and product attributes - components mapping, a platform planning process model is presented. The importance rate of product attributes and levels utilities of customer satisfaction are achieved with conjoint analysis. Quality function deployment is applied to acquire the co-relational matrix between attributes and components. Then the quantitative platform diversity index and commonality index are proposed to construct a two-objective leverage model and calculated by evolutionary algorithms to get Pareto optimal design solutions. The effectiveness of the proposed method is illustrated by the leverage planning for large-scale hydraulic support platform.

Abstract: In this paper, new technology of noncircular turning was presented, a voice coil motor-driven fasting tool servo system was established. A dual stage actuator mechanism was designed for the variable rake angle tool in noncircular turning process. The kinematics of mechanism was analyzed. An active disturbance rejection control technique was applied in mechanism control. The tool feeding and the workpiece rotation synchronized by using time-base method of PMAC and achieved the noncircular auto turning. The result shows that it can improve the precision and efficiency of noncircular turning based on active disturbance rejection control.