Applied Mechanics and Materials Vols. 347-350

Abstract: The small variations of components parameters often lead to severe performance degradation in Filtered Analog Circuits (FAC). Most of the researches on soft fault diagnosis in analog circuit are focused on the variations beyond 30% of the nominal parameter in recent years, which is usually unacceptable in FAC. To diagnose the soft fault of small deviation as earlier as possible, the Hidden Markov Model (HMM) was introduced to monitor the FAC. Different from the existing diagnosis approaches based on HMM, in which the variations of components parameters were considered to be random, the continuous variations of the fault component parameter are discretized and modeled by the hidden states of the proposed HMM method. The experiment demonstrates that the proposed HMM approach can model the FAC effectively and recognize the incipient fault earlier.

Abstract: A 10 kA HTS cable for the most transmission current in the world has been successfully demonstration developed on Sep. 26, 2012 in Gongyi, Henan Province of China. The 10 kV HTS cable is 360 meters long. This paper described the temperature measuring for the 10 kA HTS cable and the calibrated error is 0.1 K. The temperature signals of the 10 kA HTS cable conclude the high-voltage temperature signals and the low-voltage temperature signals which use the different high-precision digital voltmeters to test. Software is developed by using GENESIS 64 program.

Abstract: It describes the types,the existing problems and three improved methods on the condensation air blower of roof-mounted automobile air-conditioning. It details a specific method, a practical circuit and the experimental results of the sensorless BLDC motor for condensing blower based on dsPIC30F4011 control,. According to the need of the current States on automatically climate air conditioning system (ACC system) , and the features of the roof-mounted automobile air-conditioning, we think it is more reasonable,the dsPIC30F4011 and the sensorless BLDC motor can be used for the the condensation air blower of automobile air conditioning.

Abstract: In this paper, research on measurement methods of hole during the parts online detection has been made. Both diameter and position of the hole are going to be detected in the same measurement system. In order to obtain higher accuracy and efficiency, a comparative analysis test of using the contact probes, the inductive sensor, the laser sensor, the forward and back lighting CCD imaging have been achieved. Results show that the contact measurement using inductive sensor is more suitable for the system, for the reason that it has higher reliability and efficiency.

Abstract: Multi-dimension force platform (MFP) is commonly used in human balance function assessment to measure the ground reaction force and the center of pressure (COP). For improving the precision of measurement and simplification the calibration process, this paper devised a generalized load calibration device which can calibrate six axis force simultaneously. Based on the load shift principle, the true loads in every axis were determined when a generalized load was applied on the platform. After experimental verification on force plate devised by our laboratory, the calibration matrix C was calculated based on least-squares approach. The result showed that the crosstalk was kept below the thresholds of most common, commercial force platform.

Abstract: A special designed dual-spindle tool was assembled on the end of a Cartesian robot for purpose of cleaning up mounting holes of carbon anodes used in aluminum electrolytic production. Spiral grooves distributed around inner wall of the mounting holes lead to force compliance issues during cleaning process. Decomposing the task space into force and position control directions, the compliance movement of the scraping tools was accomplished based on hybrid force-position method. Fuzzy strategy combining with conventional PI controller was utilized to perform torque control of scraping blades of the cleaning tool while the environment stiffness is uncertain. The control algorithm was realized in a programmable logic controller based on look-up table of fuzzy rules. Cleaning tests in actual production line were also performed that indicated the validity of the force compliance controller.

Abstract: A static test system of photoelectric parameters for a smart ammunition is introduced, which provides a new solution for the detection of smart ammunitions. The system uses the technology of virtual instruments, PXI buses and intelligent connectors, constructs its hardware platform by the method of PXI modules, develops the test software in the circumstance of LabWindows/CVI and accomplishes the test of related parameters by the control of relevant modules. Experiments show that, the system designs reasonably, compared with traditional testing instruments, it is more accurate, reliable, and has favorable extending. It can also finish many other kinds of smart ammunitions by add or reduce relevant hardware modules and software modules.

Abstract: Construct the fuzzy comprehensive evaluation model on geological exploration project supervision index system, and be able to provide reference for geological and mineral exploration relating departments to make decisions. The comprehensive evaluation model is proven to be effective by analyzing some index selection solutions. Apply fuzzy comprehensive evaluation (FCE) method to the selection of geological exploration project supervision indexes, analyze the weights of the various factors which affect the indexes first, then perform fuzzy comprehensive evaluating on the indexes to be determined, and finally classify the evaluated objects and select corresponding indexes according to evaluation results. The method resolves the issues of strong subjectivity and results lacking of quantization which are caused by selecting indexes by simple analogy, and has higher scientificity and practical values.

Abstract: Firstly, considering the actual status and the characteristics of equipment management, the typical EOQ model was studied. Secondly, taking the ordering model with random demand as the research object, the inventory model under the condition with definite demand was established, and the optimal solution was given out. Finally, the simulation and calculation were carried out for a numerical example. The result shows the reasonable and applicable of the model.

Abstract: In order to obtain the characteristic parameters reflecting fault state of high-speed automaton (HSA), the fault feature extraction method based on motion morphology decomposition and wavelet packet transform (WPT) was presented. According to the movement law of the automaton, the vibration signal generated in three bursts of fire was decomposed into three separate signals, then the response signal in each shooting is a separate signal. Then using WPT to respectively extract wavelet packet energy from three separate signals as the fault characteristic parameters of HSA. By the example, the results show that the extracted fault features can well reflect the working conditions of automaton. Thus the proposed method could be used to extract the fault feature of automaton for monitoring the condition and diagnosing the fault of automaton.