Applied Mechanics and Materials Vols. 37-38

Abstract: Based on the analysis of Maslow’s hierarchy of needs, this study explored the method of product design which takes five levels of human needs as a starting point. By combining with the dual attributes of modern Chinese furniture on industrial product and cultural product, this research proposed a design model of modern Chinese furniture based on hierarchy of needs, which can provide with cross-references to design practice.

Abstract: In this paper, according to the ICM (Independent Continuous Mapping) method, the topology optimization problem of continuum structures is solved. The topology optimization model for the continuum structure is constructed, which minimized weight as the objective function and was subjected to the buckling constraints. Based on the Taylor expansion, the filtering function and the Rayleigh quotient, the objective function and the buckling constraint are approximately expressed as the explicit function. The optimization model is translated into a dual programming and solved by the sequence second-order programming. Finally, the compressed bar examples are presented. They verified the length coefficient which is converted into stability bar hinged at both ends, identified the location of bottlenecks in topological structures. According to the results, more reasonable topological structures were given.

Abstract: This paper elaborates the main contents of collaborative design supported by computer and discusses cores of collaborative design architecture of engineering machinery and real-time collaboration under the CAD environment. Under the collaborative characteristics of simulation technology, it expounds the notion of collaborative simulation and operational environment. Finally it points out that cooperative work supported by computer has a broad applied prospect in the manufacturing industry of engineering machinery.

Abstract: Fault vibration signals of gear box are faint shock and are hardly extracted, which bring a big difficulty for diagnosis. This paper mainly introduces the basic principle of the resonance demodulation technique and its application study in the gear box’s fault diagnosis. The developed resonance demodulation technique can effectively extract the fault features from complex vibration signals through the resonance demodulation technique according to the vibration features of the gear box, and improve the equipments’ fault diagnosis precision.

Abstract: Modern management is a science of technology that adopts analysis, test and quantification methods to make a comprehensive arrangement of the limited resources to realize an efficient operation of a practical system. Simulated annealing algorithm has become one of the important tools for solving complex optimization problems, because of its intelligence, widely used and global search ability. Genetic algorithm may prevent effectively searching process from restraining in local optimum, thus it is more possible to obtains the global optimal solution.This paper solves unconstrained programming by simulated annealing algorithm and calculates constrained nonlinear programming by genetic algorithm in modern management. So that optimization process was simplified and the global optimal solution is ensured reliably.

Abstract: The failure of the gas valve’s external screw taper thread is a very serious problem which may result in accidents. Routine inspection on the threads are thus necessary. The efficiency of traditional manual testing methods can not meet the production requirements. An automatic visual inspection system for gas valve’s exteranl screw taper thread was presented in the paper. The system consists of a high-performance 200 megapixels CCD camera, a LED backlight and a holder of gas valve. Through image acquisition, image processing, edge detection and feature dimension measurement, the system can effectively measure the parameters of taper thread such as angle of thread, depth of thread, taper angle of thread on image domain. It can meet the testing requirements of the external screw taper thread and has wide application perspective.

Abstract: In this paper, a method for axis to plane in random direction perpendicularity error evaluation based on new generation GPS is proposed. On the basis of a comprehensive study about the definition and measurement method of perpendicularity error, the evaluation model based on the minimum zone conditions is established. Datum plane is transformed to coordinate plane through transition matrix, so the perpendicularity error of measured element to datum plane can be transformed to that of measured element to coordinate plane. The evaluation model is simplified. Example shows that the perpendicularity error of axis to plane can be evaluated accurately and effectively.

Abstract: In conceptual mechanical design process, designers sometimes focus their attentions on mapping a sub-function or functional unit to a single mechanism or system, and ignore the interfaces among the structural elements. This paper first summarized the behavioral characteristic of the interfaces in energy, mechanics, kinematics by analyzing the roles, classification and connection styles of such interfaces. Subsequently, it introduced the concepts of function and free surface, and gave the interface design process. Finally, a case study was conducted to demonstrate the feasibility of the proposed methodologies.

Abstract: Behavioral characteristic is one of the important targets in conceptual design and re-design of electromechanical products. To summarize the knowledge of behavior characteristics of electromechanical products, this paper proposed the concepts of behavioral effect, elemental behavior and behavioral chain. It made the modification to classical Petri nets, then analyzed and expressed the behavior characteristics using the modified Petri nets. Finally, a case study of an electric nail-gun was conducted to demonstrate the feasibility of the proposed methodologies.

Abstract: Assembly devices are important in manufacturing systems. To study their conceptual design methodologies, it is necessary to investigate their behavioral process characteristics. In this paper, the behavioral processes exhibited by some assembly devices were studied, from which we discovered the so-called “phenyl-loop behaviors” with some unique characteristics. Some specific rules were subsequently proposed to help identify these behaviors, and their usefulness for conceptual design was also discussed. A structure-behavior database was set up based on existing assembly devices and a design platform was constructed for assembly devices design.