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This paper introduces a DSP-based network monitoring intelligent management system for power supply safety on campus. The system applies Demyer wavelet load current analysis technology. It has automatic control and identification on load level and characteristics. Because frequency of power network fluctuates, the system utilizes phase-locked technology to produce synchronized multiple frequency pulse...
Wheel set wear online measurement is important for the safety running of train vehicle. Measuring principle based on structure light imaging and machine vision was put forward. The main components included structure light source, CCD and wheel detector. Calibration error of CCD and wheel detector will greatly influence the precision of the wear measurement. A calibration system was designed for the...
Traffic conflict studies have been widely used because the data of traffic conflicts can be collected and evaluated in a short period of time. Widespread studies have shown that there is close relationship between traffic accidents and traffic conflicts. Since the data of traffic accidents are usually inadequate and the application of traffic accident analysis often requires long periods of data accumulation,...
Through the theoretically analyzing of the foundation of outburst prediction indexes and the existing prediction data of coal mine, a mathematics model was established with the dimension theories by considering with weights of dominant factors for ascertaining sensitive factors of coal seam. The established model and grey relevancy analysis were successfully verified in four coal mine of Pingdingshan...
According to the statistics, roof and side fall accidents often occur and jeopardize greatly in coal mines. The variation of the strain and stress in the surrounding rocks of the mine roadway can predict the accident. How to obtain the strain and stress is the key point of the prediction. This paper provides a method on the case. Firstly the principle of monitoring stress in surrounding rocks of mine...
Hydraulic power steering systems, which can provide large steering assist force, are widely used for heavy-duty commercial vehicles to enhance the driving comfort. Such systems have great influences on vehicle controllability, steering stability and safety. However, interpolated table from experiment data was used as the assist force to study the vehicle dynamics in many previous works, so the transient...
Traditionally, the vulnerability calculation of aircraft subjected to traditional weapon hits by nonexplosive penetrators or missile fragments include two categories. One is exact solution methods (Markov Chain, Tree Diagram) which usually generate large matrix leading to combinatorial explosion problem when aircraft has large amount of redundant components. The other is approximate solution methods...
Nondestructive damage detection technique is essential to ensure safety, reliability and operational life. But the large amount data and complex information can lead to wrong judgment. A kind of multi-information fusion method was applied in damage detection system based on Dempster-Shafer evidence theory. The constructed integrated parameter performed well in the sensitivity and reliability compared...
Because of wire rope conveyer belt with high load operating and complex conditions of coal mine, it is prone to cause conveyer belt horizontal rupture. It will bring tremendous hazards for coal mine safe production. Defects of wire rope and joints displacement are monitored by weak magnetic detection system. The algorithm of integration with wavelet transform and improved LMS adaptive filtering algorithm...
It's very important to monitor the mechanical condition of portal crane for the device safety management. According to the characters of portal crane, a wireless monitoring system of the mechanical condition has been designed in the paper, including the status of metal structure, slewing bearing and speed reducer. The system has solved the temperature drift, zero point setting and other problems of...
Urban public transport transit system plays an important role in the public transportation system in Shanghai. Based on the interchange station Yishan Road station, where subway line 3, 4 and 9 interchanges, the research on public transportation transit system was initiated. On the basis of characteristics of passenger transfer, the transit model was established using on-board time, transit time,...
With the demonstration application and commercialization of electric vehicles (EVs), the collision safety of EVs increasingly becomes the concern of the community. The power source of EVs is battery pack which consists of decades and even hundreds of batteries through serial connection or parallel connection, so the collision safety of EVs is different from the one of traditional vehicles. This paper...
At present, the rural road traffic safety in our country is still poor and needs improvement. Many countermeasures to improve the rural traffic safety are difficult to be fulfilled because of the shortage of fund, which leads to more traffic safety problems. Under this situation, it is necessary to offer some low-cost, easy-to-operate countermeasures to solve the traffic safety problems. Comparing...
Ship power system continuously expanding its scale makes simulation test to grow its importance for the safety evaluation. This platform integrates object-oriented technology, visualization technology and database technology to build ship power system graphical simulation platform. We establish the simulation model of ship power system component by using object-oriented technology. The user just needs...
Nuclear, acting as the most potential development direction of electricity industry, has advantages such as clear, high efficiency, effective supplement to electricity industry development continuously. The environment protection of nuclear plant differing from thermal power plant is that the cleaning don't means hygiene maintaining simply, on the country, it means the rising of plant's environment...
The insulation level of the motor Winding would be degraded with time and the motor Winding would resumed tide soon after processing, the mechanism of this problem yielding was analyzed, the ultrasonic cleaning method was studies and one ultrasonic cleaning device was designed. Its safety was verified by the destructive experiment. The test show that this device can clear away the depositional dirt...
Based on the problem that the ultrasonic cleaning can destroy the insulating layer of the motor winding and affect the motor safety, the destructive effect mechanism is analyzed, designed a enameled wire-based destructive experiment method, and finally realized the selection of cleaning power and time. It was indicated by the motor experiments that the cleaning parameters selected in this way didn't...
In a hydropower station, the lifting machine is a key device, which is used to lift heavy parts such as turbine rotor and draw-gate. Usually, the machine has a very large scale and is heavy, and its supporting mechanism is made of metal structural section. In addition, the structures are specifically designed according to non-standard method. After using many years, the structures may develop cracks...
Since 2003, the Chinese government has taken a series of targeted policies and measures to suppress road accidents. In the case of the rapid economic development, rapidly growing motor vehicle amount, and changes greatly in road safety environment, China successfully achieved the objectives that road accidents from the peak to be suppressed, until to the decline year-by-year. The situation of road...
In order to take effective dust removal measurement of transfer point of a coal preparation plant, it is necessary to put forward the optimal dust removal scheme. Production workmanship and dust pollution mechanism of the transfer point in a typical coal preparation plant has been analyzed. Based on the analyses, two feasible dust removal schemes of transfer point, namely the guide-chute dust removal...
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