Applied Mechanics and Materials Vols. 602-605

Abstract: Aircraft noise is the chief source of the airport and its peripheral areas. CCAR imposes restriction on specific categories of aircraft and requires more strict measurements of the noise. More scientific measurement method is required to meet the progressively tighter certification standards. Test noise procedures for transport category and turbojet airplanes are analyzed in this paper. The main aspects involved are: test sit requirements, aircraft flight path guidance, aircraft position determination, take off tests, lateral tests and approach tests.

Abstract: In the modern battlefield, Radar is one of the most important equipment in the field of information access and precision-guided, battlefield targets face increasing radar threat, the application of radar stealth technology can improve the survivability of the target to some extent. But the development of radar stealth technology with tank for typical ground weapon is slow, especially to the existing ground weapon. This paper analyzes the distribution of radar scattering characteristics of the existing tank, and the deformable member for shape stealth for existing tank is designed, the results prove that the RCS of tank can be preferably reduced with the deformable members.

Abstract: In the process of water-into-ice, the capacitance will be changed, the ice thickness can be obtained indirectly through the detection of capacitance. This paper introduced an ice thickness measurement method based on PCap01 high precision micro capacitance measurement chip. The system designed with this method takes low power micro-controller MSP430F149 as the core, Labview as PC. The communication between PCap01 and MSP430F149 through the SPI bus, then the PC realizes the real-time data display and storage. Experimental results show that, the system has the advantages of simple structure, high precision, strong practicability, low power consumption, it is very suitable for the measurement.

Abstract: In the artificial rumen device constant temperature water bath temperature control for model and parameter uncertainty is proposed that 89S51 microcontroller as the control core, using fuzzy control algorithm, realized thermostatically control of water bath temperature. This paper presents the overall system architecture and design philosophy of fuzzy control unit and associated circuits. Systematic simulation and test operation showed that: the good dynamic responses of the system, high precision control, strong robustness, achieve better control of the water bath temperature.

Abstract: ADS-B (Automatic Dependent Surveillance - Broadcast) and MLAT (Multilateration) are the main surveillance techniques for ATC (Air Traffic Control), and will play an important role in the future's tracking system. The fusion between ADS-B and MLAT is able to achieve more accurate tracking. In views of the data characters of these two techniques, this paper designs a concrete fusion framework with multi-levels based on federal Kalman filters to fuse ADS-B and MLAT in approach. Under this framework, both ADS-B and MLAT data are processed intensively to achieve high accuracy. Experimental results based on simulation and practical data illustrate the algorithm can achieve high precision.

Abstract: In traffic accident scene investigation, the traditional measuring and positioning methods cannot meet current requirement for efficiency and effectiveness. Which means the Investigators need use tape to measure the distance between accident factors and reference points, and then mark the corresponding elements -- dots, straight lines, curves, closed curves and so on - on the diagram for traffic accident scene investigation. A new radio location system integrated with RFID and WSN has been established to solve the problem. The function of RFID is to clearly mark the ID, attribute and affiliation; WSN to acquire locations of factors from the sensors; ZIGBEE to transmit the combined data (RFID and WSN data) to computers through networks. Using special software to automatically processing the received data for a visualized location map, including the following processes of A) locating survey marks with the geometric algorithm. B) Defining the types of survey marks, such as isolated points, line end points, curve end points, intermediate points etc. C) Classifying the survey marks, such as front wheels, rear wheels, skid marks, body locations, position of fallout etc.

Abstract: When applying the standard particle swarm algorithm to image registering, it has a problem of convergence and the speed of the convergence. Aiming at this, we proposed a modified particle swarm optimization; a simple error correction mechanism is introduced into the update process of the particle, so that the particle’s error evolution can be corrected in time. To test the novel algorithm, we used a typical function to identify it. It can be seen from the simulation results that the convergence ability and the convergence speed of the new algorithm was increased effectively. Then applying the PSO algorithm to image registering, the experiment result is good.

Abstract: Based on the Internet of things, this paper brings forwards the general design framework of the system construction and analyzes its functions. We make the construction figure with the media of RFID, sensor and two-dimensional bar code, propose four aspects to construct intelligent campus mobile service applications and make functional planning to mobile educational administration, mobile library, mobile office, mobile admissions and five mobile service centers.

Abstract: At present, traditional navigation method could not provide long-time stability attitude information for the high spinning projectile because of drift errors of micro-inertial sensors. Meanwhile, the projectile attitude measuring method with respect to the earth's magnetic field is still auxiliary. The principle of characteristic ratio algorithm and compensation model of the background magnetic field for the spinning projectile are been introduced. To realize the high accuracy attitude measuring of the projectile, a new correcting method is proposed. The detail correcting steps are derived with the linear interpolation theory and iterative algorithm. On this basis, numerical simulation is conducted combining with projectile's flight rules. The results show that the corrected attitude angles errors are within, and attitude update rate increased obviously. The calculating results could better describe the whole real roll motion. The proposed correcting method is significantly effective.

Abstract: Pulse chasing is an important means to achieve foundation-bistatic radar space synchronization. The principle and working process of achieving space synchronization by using pulse chasing is described which is based on a motion platform in bistatic radar; and the requirements on the receiving beam width is derived. How to cause the error of space synchronization with pulse chasing and its factors are analysed in detail, then the simulation on error of receiving beam width and beam pointing has been realized.