Advanced Materials Research Vol. 422

Abstract: The oil-immersed transformer tank is an outside package component of the transformer body. The sealing quality and mechanical strength of the oil tank are affected by the deformation after loading. In this paper, the 3D finite element model of oil-immersed transformer tank is established. The oil-immersed transformer tank deformation is obtained by FEA under the condition of vacuuming. A series of experiments about the deformation of the oil-immersed transformer tank are carried out. Comparing experiment results with FEA results, FEA results are agrees well with the experiments’. It can save the time consumed on designing the oil tank, and has the directive function for the whole design.

Abstract: Based on the theory of graph representation, links of the oblique crossing 3R wrist are devided into carriers and carried links, and contributions of the carried links to the generaliazed inertia forces can be divided into two parts. The first part is due to the motion with the carriers and the second part is due to the motion relative to their carriers. At the same time, the concept of virtual link is introduced to calculate the first part and carriers’ generaliazed inertia forces. The second part is derived with Lagrange Equation. At the end, an efficient and systematic dynamic equation in which the coupling effects of carried links can be identified individually and systematically, is developed. This method provides the basis for the design of driving chains and leads to a computer automated analysis for other geared robotic mechanisms.

Abstract: In real life, deep well trapping accidents of people frequently occur，but no appropriate and effective rescue equipment is available. After site investigation and analysis, we hereby design a sort of remote control deep well rescue machine, in which the components are free to remove，the length can be freely adjusted according to the depth of wells. The bottom of the device is provided with mechanical hands and chassis with airbags. By controlling the robot with remote control technology, the device solves the problem that the rescue workers can not perform direct rescue on the victims due to the small width of the well mouth. A camera is installed at the lower part of the device, which enables the rescuers to accurately observe the underground situation, thereby solving the problem of being unable to accurately locate the trapped people with human eyes due to the smallness of the well mouth and insufficient light.

Abstract: Based on the analysis of characteristics and Application requirements, one type of micro pure electric garbage transfer vehicle was designed. The power layout program, chassis layout and hydraulic lifting mechanism were researched to meet the driving safety need and automobile ride. The McPherson independent front suspension and the coil spring integral rear suspension were selected as the suspension program. The type of motor front and front drive was the arrangement of power system. The ladder frame chassis was selected for its high strength and low cost and the finite element analysis of frame was executed to verify the strength. The lifting mechanism was the key of the vehicle, one integrated hydraulic lifting mechanism was selected and the lifting time and angle and cylinder diameter were calculated. The tests confirm the sample vehicle being of reliable design and good performance.

Abstract: The fan shaft sleeve is a very important part of the fan-related machine and has high demand for precision. At present, due to the lack of machine that exclusively for sleeve processing at home, the sleeve production largely depends on manual labor which yields very low productivity. This paper introduces an automatic machine for fan shaft sleeve processing which introduces the Omron PLC as the hardcore of the control system. The machine proposed also includes a cam splitter. Controlled by motors, clutches and retarders, the splitter provides 6 stations for feeding, drilling, taping, milling, chamfer and discharging. Driven by 3 phases AC motors and air tanks, the machine can mange the fan shaft sleeve processing automatically and achieves high productivity and quality.

Abstract: According to the working characteristics and installment environments of modules，a compact 6-DOF installing-calibrating robot was designed. Coordinate systems of joints are set upand the forward kinematic solution are derived by using D-H methods. Using the Monte Carlo method based on random probability and MATLAB software simulation for the robot's structural parameters to the robot's workspace impact. According to joint space to the mapping workspace，robots have been the workspace. The research results have proved that the designed configuration can satisfy the needs of installment action，which will provide theoretical reference for the robot trajectory planning，dynamic analysis and online real-time calculation.

Abstract: With the rapid development of the global economy, automobile industry and high-grade highway create the necessary tools and infrastructure for the fast and convenient traffic. However, the cars also bring some negative effects of human life, such as traffic accidents. China has become the world's most serious national in the traffic accidents. In order to make the traffic accident rescue convenient, the automatic positioning system is studied, and the software and hardware are also designed. The control system uses the PIC18F458 as a controller, which combines with the modern sensor technology and GPS, and realizes the automatic positioning in traffic accidents. Experiments show that the system has the advantages of stability, reliability and strong anti-interference ability.

Abstract: A new control solution to tank regulator control problems is proposed for the characteristics. It is through variable structure controller (VSC) based on extended state observer (ESO) and unit vector, where the disturbance and high-order factors are estimated and compensated by using ESO. Through tests, the proposed approach can be used in the tank regulator control system. It is better than the engineering PID and general VSC. Furthermore, the chatter of VSC is reduced, because ESO provides a high-frequency path for the dynamic state which is not modeling.

Abstract: Differential Evolution (DE) algorithm has been used to solve the reverse problem of fiber gratings, namely, reconstructing the structure parameters of uniform and chirped fiber gratings from the target reflection spectra. The reconstructed parameters and corresponding spectra are in good agreement with the target ones. Numerical examples demonstrate the highly efficiency and accuracy of DE algorithm in solving the reverse problem of fiber Gratings.

Abstract: This paper developed an automatic control system for folding arm awning based on environmental factors, which can overcome the disadvantages of the traditional awning of unitary control mode and low level of intelligence. The system consists of sensor unit, controller, drive motor and transmission mechanism. The sensor unit is used for testing light intensity, wind speed and rain, then an AT89S52 SCM single-chip microcomputer which is the core of the controller is applied to receive testing signal and send instructions to AC motor to realize the extending and withdrawing state of the awning according to the corresponding control logic. Meanwhile, this system is able to switch from automatic control to manual control so as to deal with power outage and other special situation and maintain operation of awning. The results of the prototype test show that this system is running steadily and can adjust the working condition of the awning in time according to the environment change. Compared with the current electric awning, the intelligent folding arm awning controlled according to environmental factors can achieve more energy conservation and environmental protection.