Advanced Materials Research Vols. 433-440

Abstract: According to the anti-vibration performance test requirements to the UHF RFID passive tag in the application of civil aviation luggage transport, the paper designs a vibration measurement instrument for UHF RFID passive tag. A vibration test scheme is designed based on non-resonance single-axis inertial vibration principle, which builds the mathematical model and vibration equation. Thereafter, a software ADAMS is applied to simulate the vibration performance, and the effects of motor speed, eccentric quality and spring stiffness coefficient are analyzed to provide the basis for the further manufacturing. Finally, a prototype is realized, and a vibration performance test based on piezoelectric accelerometer is proposed to obtain the performance parameters. The test shows that the parameters including vibration frequency and the maximum peak to peak vibration displacement satisfy the design requirements.

Abstract: A novel ferrofluid-based microvalve adopting an electromagnetic actuation is presented. In the device, ferrofluid controlled by magnetic force is used as a microactuator. The deflection of the diaphragm caused by the ferrofluid-based actuator opens or closes the fluid flow in the microchannel. A detailed description of the design and working principle of the microvalve is presented. The driving force generated by the ferrofluid under applied magnetic field has been measured by a microforce sensor. And the deflection of the diaphragm has been simulated by ANSYS software.

Abstract: In the case that the accuracy of standard kalman filter (SKF) declines when the noise statistical characteristics are unknown or changing, a measurement-based adaptive kalman filtering algorithm (MAKF) is presented. Based on the contrastive analysis of measurement characteristics of different measurement systems, MAKF is put forward to estimate adaptively the measurement noise variance R by co-difference measurement sequences. Simulation is performed by applying this algorithm to the GPS/INS integrated navigation system, the results show that MAKF can track the GPS measurement noise in real time on condition that the GPS measurement noise is unknown or changing, and the filtering accuracy and robustness are superior to those of SKF and an improved Sage-Husa adaptive kalman filtering algorithm.

Abstract: This paper introduces a method for interactive direct manipulation of motion capture animation, which allows a user to alter positional properties of a motion and preserves the motions’ quality. The algorithm contains three stages: motion analysis, motion path editing, and constraint reconstruction. Our experiments show that by using the algorithm human motion can be transformed successfully from the old path to the new path.

Abstract: In this paper, the simulation of ±800kV UHVDC transmission line in which fault lightning stroke and non-fault lightning stroke, line short circuit occur shows: because there is fault current lumped parameter access to earth during the fault lightning stroke or ground fault, the voltage waveform decrease suddenly and cross repeatedly the zero line in 5ms time window；There is no fault current accessing to earth during non-fault lighting stroke, the disturbance caused by lightning is too less than value of the pole voltage. The voltage waveform comes from the protect position change up and down around the direct voltage line and decays to the pole voltage line in the 5ms time window at last. In the case of the fault lightning or ground fault non-lightning, the correlation degree of transient component and pole voltage line in the time window is little. On the contrary, it is large during the non-fault lighting. Above this, the correlation degree is calculated using 5ms samples. This kind of algorithm can resist random noise effectively,calculating speed is very fast. Many PSCAD simulations show that the algorithm can identify lighting disturbance correctly.

Abstract: For the sake of overcoming the shortcoming of the manual sorting fruit such as inefficiency, inconformity and labor intensity, the weighing fruit grader is designed. The machine is composed of mechanism, computer, data acquisition card, DC PWM system, and pressure sensor. In the system, automatic fruit grading is realized according to the weight measured by pressure sensor. Based on the virtual instrument technology, a humanized human-computer interface is designed by means of Labwindows/CVI. Experiments explain that the precision of the fruits sorting is 96% when the velocity of the transport system is 0.5m/s. The system owns high real-time performance and dependability and it has a good application prospect.

Abstract: Aiming at the image compression algorithms with the used BP neural network ,they have inherent defects of poor universality and long training time, a model of the dynamic adjusting hidden layer nodes of BP neural network is designed. According to the training image, using the correlation coefficient and dispersion degree of the same hidden layer’s nodes, we cut and delete some no nodes, this algorithm not only can improve learning speed effectively but also has certain generalization ability, and can complete the task of no- training images compression through experiments.

Abstract: There are a great deal and various types of resource in grid, it is important for ensuring share of grid resource and cooperative working to discovery resource efficiently. After two kinds agorithm of resource discovery adopted in grid are analysed, multi-layers resource discovery agorithm is brought up in this text. Time complication and space complication are compared among the three alorithm in theory, and it test the performance of the three agorithm at last.

Abstract: With the rapid growth of the national economy, the demand for electricity is increasing rapidly. In order to ensure electric power system operates safely and stably, much attention has been paid to insulation condition and lightning proof abilities of HV transmission lines. Nowadays the study of lightning protection of transmission line, which takes districts as the research object, has certain limitations. To provide a more rational basis for insulation design of the new transmission lines as well as insulation improvement in the old, this paper brings in a new analysis method based on ArcGIS. It is also taking the environmental factors, such as landscape along the transmission lines, into consideration. This method first filters and statistically analyzes lightning location data, and establishes assessment model of lightning proof abilities of transmission lines, which can serve as reference for finding the segment struck by lightning. In order to verify the feasibility of the model, this paper took a 220kV transmission line of a region in the Pearl River Delta as an example, and analyzed the distribution of parameters of lightning activities for the past decade. The result shows that the segments where flashover trip occurred have great relevance with the results of the data analysis. It is true that the model can be provided as a reference to the improvement of the insulation level of lines.

Abstract: In this paper, strong Moire-fringe density and direction are studied in noisy phase maps using a preprocessing method of automatic Moire–fringe analysis. This information can be used to improve the performance of 2-D phase unwrapping methods, to construct phase-jump-preserving filtering strategies, and also to perform robust segmentation of phase data. The method is highly insensitive to noise, is model based and perforros the studies in the Fourier domain.