Applied Mechanics and Materials Vols. 373-375

Abstract: Testing and software EPS setting with the emphasis on the cooperation with other related devices represents a complex issue. Each of the EPS testing strives for maximum testing of the system proposed whilst the minimum number of essential tests is used and the maximum reliability and software correctness as well as the requirements of the Regulation No. 726/2002 are met.

Abstract: According to the demand of the present agricultural environment on-line monitoring, a design scheme based on Nx5883 wireless remote control terminal is proposed for agricultural environment monitoring system. The monitoring system consists of background detection server and remote detection terminal; it can real-timely monitor the environment variables such as temperature, humidity and sunlight which can influence crop growth. Firstly the system framework is given, secondly the hardware is designed. Whats more, the function application and work process is given. Because of using the wireless data transmission, the system solved the existent problems in upgrade and expanding. Because the monitoring system has the advantages of low-power, low-cost, agile expanding and so on, it will possess a wildly application foreground.

Abstract: It is unavoidable that the geomagnetic field measurement is interfered by the vehicle magnetic field in geomagnetic navigation. In order to improve the measurement accuracy, the magnetic interference of vehicle must be correctly compensated. Based on the ellipse fitting compensation method, a new 3D magnetic interference compensation method is proposed. The proposed method improves the vehicle magnetic interference compensation method from 2D ellipse fitting to 3D ellipsoid fitting by the least square algorithm of ellipsoid restriction, which relaxes the restriction on 2D motion of vehicles. And a computing method of the compensation parameters is proposed to decrease the load of calculation. Finally, the experiment shows that the compensation method can compensate the vehicle 3D magnetic interference efficiently.

Abstract: In this paper, we propose an intrusion detection method that combines rough set theory and Fuzzy C-Means for network intrusion detection. The first step consists of feature selection which is based on rough set theory. The next phase is clustering by using Fuzzy C-Means. Rough set theory is an efficient tool for further reducing redundancy. Fuzzy C-Means allows objects which are belong to several clusters simultaneously, with different degrees of membership. To evaluate the performance of the introduced approach, we applied them to the international Knowledge Discovery and Data mining intrusion detection dataset. In the experimentations, we compare the performance of the rough set theory based hybrid method for network intrusion detection. Experimental results illustrate that our algorithm is accurate model for handling complex attack patterns in large network. And the method can increase the efficiency and reduce the dataset by looking for overlapping categories.

Abstract: The paper applied the ultrasonic ranging technology into the pipeline obstacle detection system. First, the article uses square waves as driver signal and the threshold detection method to estimate the distance, then replace the square wave with m-sequence because of the unsatisfactorily test results. In order to improve the accuracy of measurement, four coding and three modulation modes are combined. Taking the impulse signal as a carrier wave, construct incentive sequence and detect the obstacles, analyze the results and find out the optimal combination. Finally the reason caused the error is discussed.

Abstract: The variable precision rough set theory is introduced into the fault diagnosis of power transformer. Using the reduction method of the variable precision rough set,the hidden information in power transformer faults data is reduced , and the information which plays a major role in fault classification can be obtained. This approach can overcome the defects of the classical rough set, such as the sensitivity to noise of input information, and accordingly improves the accuracy of fault diagnosis. The example shows that the variable precision rough set used in the power transformer fault diagnosis, enhance the robustness of the data analysis and processing, so, the proposed approach has a more effective diagnostic performance.

Abstract: Targeted at the faults of autopilot in fly-by-wire flight control system, a method based on integration of case and fault tree is proposed to quickly diagnose faults and provide the maintenance of autopilot system. In the process of diagnosis, according to the characteristics of fault information about autopilot system, the Build-in-test data was used to quickly search similar fault in the case base and accurately point out the fault location. For complex fault, the fault tree method is used to traverse to complete the reasoning and diagnosis procedure, and simultaneously add the results to the case base. The simulation results show the method is achieved.

Abstract: In this paper, we proposed to build a temporary testing system with virtual machine (VM) technology for studying the performance issues (e.g., number of sessions, load-sharing mechanism) and the availability of a newly built hybrid SSL-VPN system before rolling out the service. Moreover, we had designed testing cases to help locate the configuration bugs and/or improper settings, and use them as guidelines for re-adjusting the system configuration to meet the design considerations. As shown in the paper, using the VM technology helps make both the deployment and the test of the SSL-VPN service to become more effective (e.g., easier to reconfigure the system, more scalable).

Abstract: A novel integrated angle measurement system is proposed, which is based on CAN bus and can solve the problem that the traditional shaft angle measurement device is sensitive to disturbances and lack of network interface. The hardware circuits are designed based on the digital signal processor (DSP) TMS320F2812 and the resolver-to-digital converter (RDC) AD2S83. In addition, an adjustable frequency circuit based on Direct Digital Synthesizer (DDS) is designed to provide a precise reference signal. The software design is also introduced. The experimental results show that the angle measurement system is reliable, high accuracy, compact and convenient to be used.

Abstract: The dielectric characteristic parameter, such as capacitance value, the dielectric loss tangent and leakage current values will change when insulation degradation occurs in capacitive equipment, thus the insulation on-line monitoring devices were used for the insulation state monitoring. At present, the monitoring mode, functional requirements, stability requirement, reliability requirement, and the access security impact has not been fully unified among different manufacturers. For the purpose of standardization of the design, production, testing and operation management of the device, studies were carried out in field of technical parameters and test methodology. Considering the structure and working principle of this kind device, key technical parameters of functional and technical requirements were put forward, and the measurement error performance testing method, as well as the detection circuit was also given under the laboratory conditions.