Advanced Materials Research Vol. 645

Abstract: The basic principle of the hydrogen storage alloy PCT (Pressure-Composition-Temperature) measuring apparatus is introduced in this article. And the method of 3D virtual design in the hydrogen storage alloy PCT measuring apparatus based on SolidWorks software is described. The conceptual design of the system is conducted by Visio software. And the design, assembly, commissioning and optimization of parts is conducted by SolidWorks and the valve, gas piping, sample room, measuring apparatus are improved. Eventually it is found that the reliability and development efficiency of the measuring system can be effectively improved.

Abstract: The vehicle terminal is part of the vehicle monitoring system, this article introduces ARM 9 and Bei Dou navigation and communication system which consisting of vehicle terminal system, which offers a method not only could combines Bei Dou communication, GPRS communication, Ethernet communication but also provides the multi-channel data acquisition, this method could ensure that the information transmission in the abnormal situations, and also could give full play to a variety of channels, use of resources, improve efficiency, reduce communication costs, and has great application prospects.

Abstract: In order to solve the hub workpiece recogni tion, location and precision grabbing problem before fine processing, a method of hub workpiece recognition and lo cation based on design-template is proposed. In this method, create design-template according to the design size and external shape of the hub workpiece, extract some invariants as features, obtain similar ity according to the corresponding features rec ognized and extracted from target image, adjust and align the image in small range based on the smallest similarity criter ia, then achieve target location. Experiments show that this method can precisely locate the key pa rts of the hub workpiece an d the recognition accuracy is greater than 98%, error accuracy of the position and angle, resp ectively, are within 2 pixels and 0.08 degrees, moreover it has less amount of calculation. It could satisfy the actual need of production line.

Abstract: Under the influence of ice coating and other natural factors, Power tower cross arm will deform, damage and even fracture with the increasing stress. On the power tower of Yanjin converting station, four fiber Bragg grating strain sensors were installed. By changing the internal force that main material of the cross arm suffered, deflection change of each main material occurred, resulting in fiber Bragg grating wavelength of the fiber Bragg grating strain sensors which on the surface of the cross arm shifting. During the 479 days monitoring, the # 2 sensor daily mean strain range is the largest with the value of 1700.98, while the 3 # sensors have the smallest value of 1122.91. On the July 20th 2011, daily mean strain of the 2# strain sensor located in the insulation cross arm reached the maximum value 382.01, while on the February 19th 2011, that of the 4# sensor achieved the minimum value -1477.75.On the February 19th 2011, both local wind direction and speed had the biggest changes through the testing process, which indicates that the cable sweeping wind is the mainly reason to cause the power tower cross arm deformation.

Abstract: In order to determine the metrological performance of the whole vehicle mass analysis system (VMAS), in this research, we designed a set of metrological standard device which could estimate the global error of VMAS. The VMAS metrological standard device which was composed of three parts: operating console, gas sources and control unit of reference gas would calculate the theoretical total emission and compare with the measured value. The results indicate that this standard device will well satisfy the verification requirement of VMAS and evaluate the whole metrological performance of VMAS.

Abstract: The sensing finger pressure does not meet the requirements can cause isolation switch overheating, even lead to accident in the operation of high voltage isolate switch. According to the structure of isolating switch, FBG pressure sensor and FBG displacement sensor are installed on isolate switch, which constitute the sensing finger pressure detection system. The sensing finger pressure detection experiments indicate that, when the moving contact’s closing position of isolate switch changes from 0.267mm to 29.040mm, the sensing finger pressure ranges from 30.378N to 32.970N.However, when spring pressure changes from 42.776N to163.827N, the sensing finger pressure ranges from 29.033N to 111.193N.The sensing finger pressure measuring system can realize real-time and online monitoring of the sensing finger pressure.

Abstract: Created in ADAMS/View virtual environment, it combines the complementary advantages of the ADAMS secondary development programming technology APDL and VC++6.0 to build a rigidity and flexibility coupled parameterized dynamic simulation model of the PUMA560 robot, while through the self defining function of constraints and loads, it realizes the model drive loading . After multiple dynamic simulations, normal solutions and inverse solutions of the PUMA560 robot are obtained, and this can provide a foundation for the research on the operability and space locus of the PUMA560 robot. Meanwhile, this new method is also true for other similar kind of rigidity and flexibility coupled mechanics dynamic simulation and a reliable pathway for the analysis of mechanic random errors effect on its motion as well. The excellent feature of this new method is that it will considerate sufficiently the effects of key part’s elastic deformation on the entire mechanic motion, while it needs not to create complex analogue to solve the mechanic, rapidly, conveniently and with high accuracy, which has good theoretical meaning and application value.

Abstract: LGLT2 grease is a newly developed lithium based grease used widely in small rolling bearing of instrument and control equipment at high speed.In this paper the curves of the traction coefficient against slide-to-roll ratio of LGLT2 film are measured on a high-speed ball-disc traction force tester under the conditions of the varying rolling speed from 20m/s to 40m/s and the varying load from 20N to 40N.The experimental results show that the grease LGLT2 performs well under above conditions,demonsrating lower traction coefficients with the increasing rolling speed. Both T-J model and an exponential model are employed to fit the experimental data. The results show that there are high consistencies between the experimental data and calculation values obtained from both models.

Abstract: A novel double-loop control approach for reducing excess torque of the servo loading system based on disturbance observer is proposed.The mathematical model of the loading system is established by mechanism theory and the reasons causing the excess torque are analyzed, the nominal model and disturbance weighting function are determined based on an approximate method. Dis-turbance observer based the inner loop controller is designed by H ∞ mixed sensitivity method and the external-loop controller is designed as the classical PID contro ller. Both the simulation and experi-ments results show that disturbance observer is feasible and effectiv e to eliminate the excess torque, accuracy of the loading system is improved.

Abstract: In micro-EDM, the debris generated in machining process is difficult to be moved from the discharging gap, the discharge state is instability, and the material removal rate is low. A new method of PZT incentive synchronous compression discharge channel micro-EDM is presented based on the inverse piezoelectric effect of PZT piezoelectric ceramics, using a spark discharge and PZT sync pulse power. In this paper, the system composition and machining principles are described in detail, and its machining mechanism is analyzed in terms of the experiments. By the experiments, it is certificated that on the process of PZT sync compressing discharge channel machining, the state of discharge gap, the machining efficiency and quality can be improved, the throw out of debris makes easier, and then the stability of micro-EDM process is raised, which indicated that this new technology has wide application prospect in the field of micro manufacturing.