Advanced Materials Research Vol. 421

Abstract: Based on profound research of the characters on Petri Net, the concept of collaborative work heterogeneous data sharing (CWHDS) was proposed, and elaborated the modeling processes of CWHDS based on Petri Net. Furthermore, this paper used heterogeneous data queue to serve as the access station of CWHDS, and further discussed the translation and firing rule on Petri Net in relation to heterogeneous data queue. Finally, an application instance of multi-disciplinary collaborative design management system (MCDMS) based on CWHDS was introduced.

Abstract: In this paper the characteristics of acoustic field for miniature cylindrical focused transducer with a hole was studied in order to instruct the optimization design of the transducer for both realizing visualization and improving the treatment effect. Then the acoustic field was simulated numerically with different parameters of hole. It is found that position of focus is almost unchanged but acoustic pressure amplitude declines. In addition the performance of transverse focusing for the focal plane and levels length of acoustic pressure are lowered. Moreover, if size of transducer and rigidity of material permit, the area and ratio of width to height for the hole should be reduced appropriately to improve the focusing properties. And it is deduced that area and ratio of width to height for the cylinder can be increased to achieve the same therapeutic effect with a fixed hole size.

Abstract: Abstract. The computation of the responses and their design sensitivities play an essential role in structural analysis and optimization. Significant works have been done in this area. Modal method is one of the classical methods. In this study, a new error compensation method is constructed, in which the modal superposition method is hybrid with Epsilon algorithm for responses and their sensitivities analysis of undamped system. In this study the truncation error of modal superposition is expressed by the first L orders eigenvalues and its eigenvectors explicitly. The epsilon algorithm is used to accelerate the convergence of the truncation errors. Numerical examples show that the present method is validity and effectiveness.

Abstract: This paper discusses our recent research on wear at the die radius in sheet metal stamping. According to wear theory, contact pressure and sliding distance are the two dominant factors in determining sliding wear. We applied the finite element analysis to accurately quantify the contact pressure and sliding distance at the die radius in sheet metal stamping. The results were then applied to analyze sliding wear at the die radius. We found that a typical two-peak steady-state contact pressure response exists during a channel forming process. The steady-state contact pressure response was preceded by an initial transient response, which produced extremely large and localized contact pressures. We proposed a method to numerically quantify the sliding distance, which was applied to examine the contact sliding distance at the die radius. Correlating the contact pressure and sliding distance, a new insight into the wear/galling that occurs at the die radius in sheet metal stamping was gained. The results show that the region close to zero degrees on the die radius is likely to experience the most wear, with the identified transient stage contributing to a large proportion of the total wear.

Abstract: A small-high efficiency ultrasonic reactor tool is designed by this paper. This tool can promote chemical reaction rate, increase the reaction yield. Having analyzed its modal frequency with ANSYS software and assembled the manufactured tool with transducer and horn, we can use Impedance analyzer to test the actual frequency. Since there are only minor errors between actual resonant frequency and the modal frequency, this method meets the design requirements.

Abstract: With a view to the whole digging process, a multi-objective optimization model based on digging process is established. Applying the mind of system theory and complex optimization method, taking model P&H2800XP excavator for example, the structure parameter optimization of its working device is accomplished. The rational parameters obtained from this. Comparing with an original model, optimized results are ideal comparatively and the performance is improved.

Abstract: Conceptual design is the most meaningful period to show the creativity in the process of product design. TRIZ specially deals with innovation and conceptual design. A process model of conceptual design based on TRIZ is constructed. Dropping pill machine is improved by using the proposed process model. A new principle solution is obtained based on effect base in TRIZ. Then contradiction existed in the new principle solution is solved by using the principle of contradiction solving in TRIZ. New degreasing pill machine can output pills automatically, and has high availability.

Abstract: With the progress of human, the society is progressing. All products involved in society also are constantly evolving. Actually, technological system has its own technological evolution like the biological evolution. Technology evolution is not accidental, but driven by some factors. And every kind of driving force is happened according to certain principles. This paper proposed nine driving force of products technological evolution as well as the evolution theory. At last, a case study of the mobile phone verified the proposed theory.

Abstract: The engine is the main vibration resource of vehicle. In this paper the uncouple rate was the object function and the suspending system’s stiffness were set to the design variable, during the calculation the transfer rate and the frequency rotate the axle x were considered. With the optimization the uncouple rate was improved which can improve the engine’s vibration ability effectively.

Abstract: A reverse analysis method for determining the stiffness characteristics of nonlinear suspension spring with variable pitch and wire diameter is developed by introducing the ideas of dispersion. Meanwhile, the reverse analysis of a nonlinear suspension spring used in truck is completed as an example, and the progressive force-displacement curves obtained by theoretical and experimental analysis are compared in order to verify the validity of the reverse analysis method used for nonlinear suspension spring.