Applied Mechanics and Materials Vols. 716-717

Abstract: The adjacent vehicle coordination monitoring system on the expressway is to calculate the relative position and display it. So the driver can observe the behavior of adjacent vehicles more easily and then to predict their next behavior. The technology of this system is based on the energy-efficient equipment-DSP which is used to control the peripheral devices. GPS is used to locate. ZigBee will send the latitude and longitude value to each vehicle in the queue. The system will use the latitude and longitude value to calculate the relative location between the vehicle and the vehicle, and display the value on the LCD screen. So the driver can observe each other and avoid these situations such as overspeed or emergency stop. After the test of each node's hardware and software design the main functions have been proved through the experiments.

Abstract: With the development of mechanics and micro-electronic technology,sensor technology has a great improvement during the 50 years.At the same time,biologic technology is on the march.Biologist put forward more strict demand for biologic sensor,which in same degree boost progress of biologic sensor.This passage try to present basic theory of sensor and some advance biologic sensor.

Abstract: The analysis model of ANSYS finite element for annular piezoelectric resonator is built in this paper, and experiments are carried out for verifying the validity of the finite element model. The influence of the piezoelectric resonator's sizes on the natural frequencies is discussed; and the optimization for the piezoelectric resonator's sizes by using ANSYS is carried out, in the optimization procedure, the piezoelectric ceramic volume is made minimal while its first order natural frequency is kept in a range. These researches provide a theoretical basis and effective way for piezoelectric resonator design and optimization.

Abstract: It is very important that radar clutters are distinguished from others exactly when radar working in a complex environment. A new method named square convergence was proposed to classify radar clutter noises. The performance of conventional spectrum estimate algorithms based on second order statistic (SOS) degenerate in stable distribution environment, auto-covariation and auto-covariance methods based on fractional lower order statistics (FLOS) were proposed in this paper. The simulation results showed that the proposed FLOS methods were robust.

Abstract: A force acquisition system for digital impact tester was investigated, in which structural design of bar-shaped elastic element, circuit design as well as static analysis were involved. Based on analysis of international requirements on the detection precision of digital impact tester, information concerning the precision of sensor parameters, sensors and adhesive was collected, and adhesion sites were settled through finite element analysis and optimization. Circuit design involved zero setting, temperature compensation, amplifying circuit, filter circuit and circuits to connect host computer. Loading calibration test was performed on sensors under static working condition. According to partial authoritative examination, the linearity was 0.06%, the repetitiveness was 0.01%, the retardation was 0.08%, and the sensitivity was 1.112. According to the examination conducted in some metrology institute, the total work error of impact in a digital impact tester adopting the above force acquisition system was 2% of the impact value of a standard specimen, which has already reached the precision level and met the design requirement..

Abstract: NIR spectrum is established as an independent analysis technology and applied in more fields. The demand of portable and fast analysis is impeding. Using JDSU’s MicroNIR1700 NIR spectrum engine as the hardware platform, we contrived the NIR spectrum acquisition and analysis system. The spectrum data is output from the engine through USB port. We develop the software on computer by C# language. The software has the function of spectrum acquisition, pretreatment, modeling and prediction, the result is displayed by graphs and tables. This system is tested successfully by using flour sample which lays the foundation for promoting the portable NIR acquisition and analysis system.

Abstract: Chromium contaminated soil restoration has been an important environmental restoration research. Changes of microbial diversity repair, repair tools can reflect the interaction with microbial interaction effect. The experiment uses a different repair methods chromium contaminated soil restoration for the study, using PCR-RFLP study the relationship between chromium contaminated soil remediation technology and changes in bacterial communities.

Abstract: In order to improve the detection performance with the limited radar resources in the given defense zone, it is necessary to make reasonable and effective deployment of radar network. According to the principles of radar network deployment, its mathematical model is established at the beginning. And then, on the base of the shuffled frog leaping algorithm (SFLA) principle, a new method-improved shuffled frog leaping algorithm (ISFLA) is introduced through the technique of algorithm hybrid. By integrating updated strategy and chaotic optimization into SFLA, it greatly enhances the local searching efficiency and global searching performance. Moreover, the frogs are divided into two types and perform different operations to co-evolve. Finally, by analyzing an example and comparing the results with those algorithms, it comes to a conclusion that several network schemes can be obtained much more quickly by this way with better operability.

Abstract: Circular Trace Scanning SAR is a new strip map mode SAR imaging in recent years, its imaging speed is fast with larger scene. This paper first establishes the imaging geometry right, by the four order approximation of the oblique distance model, combined with the series inversion method, and the removal of the coupling terms in the spectrum in the range Doppler domain, finally complete the azimuth compression. The simulation results prove the validity and feasibility of the imaging.

Abstract: Optimal design of sensitive structure in gas pendulum tilt sensor was discussed. Using ANSYS software, fluid fields produced by heat source of the sensor in center were simulated. According simulated temperature field which is the key sensitive factor of the tilt sensor, optimal design of sensitive structure was discussed further. The results show that sensitivity of sensor is better when the distance between sensor wire and heat source is 0.2 R or 0.3R (R is radius of chamber). In respect to vertical place, experiment and theory show sensor has better sensitivity and linearity when installing angle is 60 ̊ while the horizontal distance between sensor wire and heat source is 0.3R.