Advanced Materials Research Vols. 328-330

Abstract: Conjugated internal gear is the key component of high-pressure internal gear pumps, which decides the performance of the pumps, such like volumetric efficiency, capacity of fluid discharge, wear life, flow pulse, vibration and noise. In this paper, a method of generating tooth profiles for conjugated internal gear is presented. Based on gear geometry and meshing theory, the parametric equations of involute conjugated internal gear are derived. With the help of MATLAB and SolidWorks, 3D models of the gear couple are built to evaluate the feasibility of the method.

Abstract: The most frequent cause of defect in the mandible is tumor-related surgery. Larger defects cause severe morbidity due to disturbances in function and esthetics. A fibular free flap is one way of filling a bony hole in either the upper or lower jaw. It is one of the common ways of replacing bone that has been removed for cancer treatment. Doctors use a free fibular flap which is grafted from the patient who needs a transplant operation to fit the defect. In this study, a new method combining preoperative planning and rapid prototyping for mandibular fibula free flap reconstruction after tumor surgery was made based on Mimics software simulating surgery on a workstation. The preparatory work of surgery is divided into two parts: software simulation and model building. During software simulation the authors were able to choose the best site for the osteotomies regarding circulation and the model building can increase the precision and speed of treatment. A description of our surgical approach is presented and is supplemented by an illustrative case.

Abstract: With capital projects consistently running late and over budget in urban economics, it is time to look at project managers could do to step up their implementation success and performance. In real estate industry, China, there are many uncertainties and risks for project management. Lean has been continuously adopted in the construction area as an innovated effort striving to improve productivity and to value clients’ needs. Comparing with traditional construction management, this paper proposes some applications in Lean including Last Planner System (LPS) to identify uncertainties and provide solutions.

Abstract: The gyros are the key parts in inertial guidance systems. The working accuracy and reliability of the gyros will affect the accuracy of inertial guidance systems directly. Therefore, increasing the working accuracy is a major subject for discussion. There are lots of factors affecting the accuracy. For example, the manufacturing processes, the inner configuration, the working environments and so on. Among of these factors, the larger areas influenced by heating components on gyros, the more negative influences would be made on the accuracy of gyros. For reducing its influences on the temperature distribution on gyro, two axial flow fans are installed among the gyro system. This paper studies the formation process of constant temperature in gyro auto-controlled ontology structure and the simulation technology. The results and methods provide important theoretical and application value for the high design level in the temperature device of gyros and the working accuracy.

Abstract: Nano-WS₂ (tungsten disulfide nanoparticles) lubricating oil additive, prepared by the nanometer WS₂ particulates and semi-synthetic engine base oil as raw materials, was added into Great Wall engine oil with different mass ratio. With a contrast study on these oil samples, the results show that it can improve the extreme pressure, antiwear and viscosity-temperature properties of the engine oil effectively by adding a certain amount of nano-WS₂ additive, and the optimal concentration is 2wt%. The oil film strength, sintering load and viscosity index of this lubricating oil is respectively 1.35 times, 1.58 times and 1.05 times as that of Great Wall engine oil. In addition, when tested under the grinding conditions of 392 N, 1450 r /min and 30 min, the diameter of worn spot reduces 0.018mm, and the average friction coefficients of friction pairs decrease 16.3%, both of which are lubricated by the oil containing nano-WS₂ additive. Meanwhile, the experiments testify that the tribological and viscosity-temperature properties of the nano-WS₂ additive are better than that of the Henkel MoS₂ additive.

Abstract: According to Faraday's law of electromagnetic induction,the electromagnetic vibration energy harvester can convert the mechanical vibration of human running or walking to electrical energy, the harvester output is through detection/rectification, two-stage of energy storage, stabilize voltage which is able to reach stable voltage of 4.2V,current of 355mA.The whole system doesn’t need external power supply, the electromagnetic vibration energy harvester has produced two part of the electric energy, a part used to storage, and another part provided power supply for circuit chips. Characteristic of the selected chip is low power and high stability. Analyzing the energy harvester’s structure and principles, a basic electronic circuit for storing the electrical energy is also introducing. The amount of output electrical energy about energy harvester is controlled by magnetic field strength, amplitude and frequency of human movement.

Abstract: The UG model and finite element model of FCEV subframe are established, and original subframe is simulated in all kinds of ADAMS environment, which result in the force of the conditions obtained. Then the virtual model is build, stiffness and strength analysis are conducted, and a new type of subframe structure is designed based on the analysis results. Magnesium alloy and aluminum alloy are used in optimization of this new structure for the optimal size. Through the comparative analysis on strength, stiffness, mode shape and quality of the new subframe and the original one, it was verified that the new subframe design is reasonable and feasible.

Abstract: This paper analyzes the common faults of the YMZ light silt coal car loader's hoisting device in working process, and supplies several solutions; Simultaneously, it mainly introduces two types of manufacturing technique about hoisting device's parts design and improvement in practical application and appraises the effect of the green design and manufacturing technique in the working device; The article concludes that improved workpiece performance is of great practical value; As the designers are designing the products, only when they should combine the new design concept and the mode of thinking with the green design concept, and attach importance to the innovation of science and technology during the designing process as well, and finally bring into play the advantages of the technology, can they produce safe, powerfrugal, efficient and shapely green products which are popular with people at home and abroad.

Abstract: Based on mechanical phenomena between two fixed magnetic, when the distance is short, the electromagnetic force are linear,therefore,we can make full use of the characters and make it to be permanent magnetic spring replacing the mechanical spring in hydraulic relief valves. Through the use of the Rare-earth magnetic springs in relief valves, we find it is more sensitive to load. Besides these, the rare-earth magnetic springs have a long life and high temperature resistance without failure by fatigue. So the study and design of permanent magnetic spring type relief valve have large application and research value.

Abstract: In order to solve the problem of ECG acquisition and processing better, this paper designs a portable ECG tester, which uses the SCM as the core controller. Power basic frequency interference was removed by 50 Hz trap filter. Power harmonic interference, electrode polarization interference and my electricity interference were removed by low- pass filter. Baseline drift was removed by high- pass filter. At the same time; we test the performance of acquisition circuit, filter circuit and amplification circuit. As a result, it is shown that the system can well collect and process ECG signal.