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Multi-loop model of asynchronous motor contains lots of parameters, which leads to problems such as complex calculations, difficulty in equations solution and so on. In this paper, a simplified asynchronous motor model is set up on the basis of MATLAB®/Simulink environment to imitate health states of stator inter-turn short and broken rotor bars by simulating and studying their asymmetric fault features...
This paper establishes a model that would allow China’s oil and gas enterprises to scientifically evaluate and measure their low-carbon level and status. It considers various characteristics of China’s oil and gas enterprises and the implications of low-carbon development, and is based on an overall analysis of factors that influence the reduction of carbon emissions. In view of low-carbon economic...
One of the major obstacles in developing Health Management System (HMS), by using intelligent technologies for diagnosis, prognosis, maintenance and health management of aerospace, is the correct description of knowledge. The work proposed in this paper suggests a normative knowledge representation frame based on ontology to integrate Knowledge related to Health Management of Aerospace (AHMK). In...
According to the dynamic evaluation of performance reliability of the key components of Propellant Filling System, a model simulating the filling procedure is built with AMESim. According to FMEA for the system, especially the deterioration mechanism of pneumatic ball valves, the degradation states of pneumatic ball valve are simulated, and a number of evaluation models of the degradation degree based...
This work is motivated towards building a static model for average-case power consumption for sorting algorithms. In our experiment, the sorting algorithm is run on Leon3 Processor core, and the power cosumption is measured by Synopsys Primetime tool for a large number of random data. The results of the experiment are used to validate a proposed model to statically estimate the average-case power...
To catch symptoms of machine failure as early as possible, one of the most important strategies is to apply more progressive techniques during signal processing. This paper presents a method based on stochastic resonance (SR) to detect weak fault signal. First, a discrete model of a bistable system that can demonstrate SR is researched, and the stability condition for controlling the selection of...
Propellant filling system is one of the key components of liquid rocket engine test bed and improving its reliability and security is very necessary. However because of the shortage of failure data and high expense and risk of test experiments, modeling and fault simulation are urgently needed. Based on the modular modeling, a new method using the objected-oriented language Modelica in Dymola is proposed...
Turbopump is a high-fault-rate component in Liquid Rocket Engine (LRE). In this paper, the reasons of the typical fault of turbopump rotor blade abruption and abscission are analyzed. And, by the method of dynamic analysis, the vibration features of the fault are studied to select the frequency features diagnosing effectively the fault. Then, the extraction method of the features is researched. By...
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