Advanced Materials Research Vols. 605-607

Abstract: By studying the design theory of the mobile police station (MPS), the dynamic model of the MPS basic computing has been built then a novel MPS is designed. This kind of MPS, which consists of battery, chassis, body and electrical system, uses electric vehicle as the carrier and in combination with police needs is equipped with a variety of police equipment to meet the needs of establishing a modern police. The vehicle performance test has been done. The results prove that the performance of the MPS has reached the technical level of the Ministry of Science and Technology, showing the vehicle design is reasonable, and the matching calculation results of the electrical system parameters are basically the same as the experimental results.

Abstract: A miniature loop heat pipe (MLHP) with a glass condenser was designed and manufactured. Stress analysis on compensation chamber/evaporator and glass condenser is made to confirm strength of loop heat pipe using the software MSC NASTRAN. Results indicate this new structure loop heat pipe can meet the design requirements and secure to work well. A system level performance analysis was made about heat transfer and fluid flow characteristics inside loop heat pipe using the software of SINDA/FLUINT. This miniature loop heat pipe realized visualization research of phase change phenomenon to some extent.

Abstract: Today every production worldwide has to improve their. Based on several concepts and philosophies such as Kaizen and others, it is possible to realize an increase of productivity. Since it is of great interest to know and to evaluate the improvement, a suitable method that allows not only analyzing the improvement of cost but also of time is of interest. Based on the value stream map (VSM) and the profile of cost and time (PCT) the author has developed the PECOTA method, a graphical method of analysis. The concept of investment in time and cost by PECOTA allows first-time analysis and evaluation of a change in a manufacturing process in an easy and fast way. The method includes also the possibility to define the limit of lean manufacturing with the current processes.

Abstract: Tolerance analysis plays an important role in the stage of product design and has great influences on the product assembly quality and manufacturing costs. Two major methods are used for three-dimensional functional tolerance analysis, which are small displacement torsor and analysis line. A positioning mechanism with two parts is presented for tolerance accumulation calculation. Through the comparison of these two methods on computation processes and results, analysis line method can establish the explicit relationship between the functional requirement and the tolerances of the influential part, which allows finding the accumulation results in the worst-case and statistical conditions. However, it requires the determination of transfer relationship case by case. For small displacement torsor model, it permits a set of inequalities to express the tolerance zones, which yields a linear programming problem. It is applicable to different tolerance chains for its general characteristic. However it is adopted only for the worst-case analysis and requires more computation time.

Abstract: Knowledge Based Engineering (KBE) helps sharing and reusing knowledge in modern mechanical design field. As a core part of KBE, various methods of knowledge representation were studied. In order to reuse the mechanical design knowledge, the methodology of ontology-based knowledge representation was discussed. First, the concepts, formal description, specialties and languages of ontology were described. Then, three categories of ontology in the field of mechanical design, general ontology, domain ontology and product ontology, were discussed. The product ontology was analyzed by the configuration design method. Finally, an example of ontology-based knowledge representation for mechanical products was studied. The work about ontology-based knowledge representation methodology may support the application of KBE in mechanical design field.

Abstract: Mechanical product’s design can be divided into four stages that is task clarification, conceptual design, practical design and detailed design. The conceptual design is the most important and innovative stage of the four design stages. This paper deals with functional analysis and solutions of a table jaw and its conceptual design based on the theory of functional principle design. An innovative design method of a mechanical product is also discussed by means of functional principle design.

Abstract: The paper provided an overview of computer aided tolerance design and described the research methods of tolerance design. An example of a displacement pump was employed to analyze the angle and linear tolerance. With the application of tolerance optimization design of CAD assemblies combined with tolerance annotation and tolerance accumulation validation, the product design can be optimized and the cost can be reduced effectively.

Abstract: In the early stages of the design process, the conceptual design is the stage that can determine the product cost up to 80% on average. In this stage, there are more than one product concept program to choose from. However, to make a concept prototype, and to survey a sufficient number of consumers need, a lot of time and cost need to be spent. In order to solve the above problems, this paper introduces a real-time innovative design of the network-based customer evaluation and selection methods. This method makes full use of the internet and information technology which is able to quickly transport consumer demand to the conceptual scheme at a lower cost and by calculating the extent of consumer preferences on a variety of conceptual design schemes in a short period time allow consume make their decision on a real-time basis during the design phase.

Abstract: A regenerative braking control strategy and the braking force distribution are putted forward based on the basic theory of automotive brake. The model of vehicle regenerative braking system and simulation under urban driving cycles are carried out taking a certain type of hybrid car as the research object. The simulation results show that, in circulation conditions of ECE + EUDC drive, the regenerative braking control strategy that this paper puts forward can ensure the reasonable distribution of vehicle braking force and realize the energy recovery of 15.7%.

Abstract: The diagonal impeller is a key component of the diagonal flow compressor which is a highly sophisticated system. A new DFSS methodology DAMV which has four phases, Define, Analysis, MDO and Verify, was utilized to the design of a diagonal impeller and high comprehensive performances were obtained.