Advanced Materials Research Vols. 538-541

Abstract: In recent years, green design has become a trend of modern design in regard to product, packaging and material which represents a totally new idea, that is, design is not only meant to decorate, beautify and perfect environment, it is supposed to take up the role of social responsibility and moral value. This paper explores the idea of green design and the approaches applied in modern design, suggesting that green design is not only a new way of product design, while it also meets the need of times and sustainable development.

Abstract: In workover operation, conventional way makes the process complex, labor intensity high and operating environment hostile. For solving the problem, the new scheme for workover mechanical system was put forward. Hanger was removed in the system. We can execute tube movement with macro/micro mechanical arm and achieve sending down and lifting pipe with supporting mechanical hands. It is designed for the first time in china.

Abstract: Tsarist Russia consulate, modern architecture, in Changchun City, is the protection project of history relic, the reliability of the main structure of the building is appraised to ensure it reliability and safety, and using proper repairing and strengthening methods under the conditions of keeping the original architectural style, which require a higher construction technology, at the same time the strengthening design must meet the current standards. By comparing the main structure before and after reinforcement, it not only achieve the original intention of protecting the cultural relics, but also meet the functional requirements, which provide the references for the strengthening and repairing of modern architecture.

Abstract: In order to provide knowledge service more efficiently for complex mechanical product design, a knowledge organization model for complex mechanical product design knowledge based on the process modular approach was proposed. First, a general form, the knowledge instance, would be used to represent all forms of the knowledge for complex mechanical product design; then, based on the contents and features of the knowledge instances and the semantic relations in the domain ontology, the special collections of the knowledge instances which have related features would be composed to knowledge modules, and knowledge modules would be organized as a DAG(directed acyclic graph). The complex mechanical product design knowledge could be efficiently and completely queried based-on semantic according to the logical relationships expressed in the DAG.

Abstract: Seat is a main part of vehicle to contact with occupant in rear impact and chiefly concern with the severity of neck injuries. Therefore, improvement in seat design can effectively reduce the neck injuries of occupant. For designing an effective vehicle seat to protect occupant, this study develops the numerical model of sled test by using MADYMO software and discusses the relevance between the seat parameters and occupant’s neck based on the validated numerical model. The seat parameters include the stiffness of seat angle device, seat friction and angle of head restraint. The discussion of influencing factors of seat can be referred for designing a safety seat. The occupant neck then can be protected in rear impact accidents.

Abstract: In order to optimize synchronization of wiper arm, a locomotive wiper controller of PWM and Fuzzy PID controller are proposed. The PWM controller is mainly designed of input control circuit, a central control unit, DC wiper motor pulse width modulation control and drive circuit, the motor stops the braking circuit, single-speed wiper motor of permanent magnet DC, etc. It can realize the high speed, low speed, intermission, stop function of wiper. The controller has values of stable performance, low noise, simple structure, etc. In locomotive wiper controller, Fuzzy PID controller combines the advantages of Fuzzy controller and PID controller, that it can achieve fast response, small overshoot. Fuzzy PID can also ensure the steady-state accuracy of the system, and the control performance is better than PID control and fuzzy control.

Abstract: In order to decrease the synthesis costs and resolve safety care in synthesis process of LiFePO4, a novel synthesis approach was put forward. Instead of traditional reduction atmosphere Ar/H2(95%/5%), the reducing flow produced by the breakdown of sucrose independently is used as protective atmosphere. Then, carbon-coated LiFePO4 samples were synthesized by solid-state method using Li3PO4, FePO4, Fe powder as the raw materials, and sucrose as the carbon source. The results show that the LiFePO4/C sample in this flow exhibits excellent performance after 7 hours’ sintering at 650°C. It had an initial capacity of 141.8mAh/g at 16mA/g discharge current and the coulomb efficiency reached 98.95%. Furthermore, the specific capacity was almost not fade after 20 cycles. Our experiment results prove that our approach can replace the traditional atmosphere Ar/H2, and it helps reducing the energy consumption and cost, and is expected to be commercially feasible in the future.

Abstract: The air-powered swashplate engine is different from the oil-free compressor in working principle and mechanism. In order to predict the life of the oil-free piston rings of the engine , a new method is put forward, and is used to the life prediction of the rings. The results shows that the oil-free piston rings which is designed for the air-powered swashplate engine are feasible .

Abstract: Modeling of fatigue crack growth (FCG) under variable amplitude (VA) loading has been a topic of intensive research for decades. This paper proposed an efficient numerical simulation procedure of the FCG process under VA loading via extended finite element method (XFEM). The procedure can describe the integrative effect of several factors (specimen thickness, stress ratio, Poisson’s ratio and so on) simultaneously with a general model. In order to improve the computation efficiency, the whole continua domain is divided into two parts by the level set functions and the global stiffness matrix is divided into four parts accordingly. Then, the inverse operation of global stiffness matrix can be calculated rapidly with the LDU decomposition and the equilibrium equation can be solved effectively. Several sets of fatigue test data in 2024-T351 and 7075-T6 aluminum alloys are used to verify the procedure, the predictions are in good agreement with the test data.

Abstract: Because high positioning accuracy of industrial robots requires high stiffness at the price of high robot mass and energy consumption relative to the payload of the robot, this paper describes a kind of service robot dual-arm constructed by lightweight reconfigurable modules. After analyzing the composition characteristics of service robot dual-arm, the type selection of robot arm modules is accomplished, and the hardware platform of robot dual-arm composed by modular joint is builded. According to the modularization characteristics of arm joints, the distributed control system is designed.