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To solve pneumatic pipe leakage of freight train, a base flow detection algorithm is proposed. Firstly principle of pneumatic brake system is analysed, workflow and fault characteristics of pneumatic pipe leakage are researched. Then detection process of pneumatic pipe leakage is designed with maintenance requirement. At last a base flow leakage diagnosis algorithm is discussed and verified. Experiment...
The wireless mesh network (WMN) has recently emerged as a promising technology for distributed wireless networking. In multi-radio multi-channel heterogeneous WMNs, load balancing can avoid congestion thus to improve the overall performance. A cross-layer cognitive routing protocol with load balance which using RACIM, a new metric, to choose qualified routing paths is presented. RACIM can evaluate...
This study was carried out to evaluate the diagnostic value of 226 and 1000 Hz probe-tone tympanometry in infants with effusion in the middle ear.For this study, we recruited 52 infants with ages 42 days to 6 months as clinical subjects in a hearing-ability screening program. After a spiral computerized tomography (CT) scan of the patients, we tested their hearing using tympanometry of 2 probe-tone...
In this paper, the asynchronous brake control technology is proposed for the safety of heavy-haul trains in heavy-haul transportations. And the longitudinal dynamics of heavy-haul trains, which is the basic problem of this technology, was studied. A longitudinal dynamical model was established by analyzing the condition of trails, the equipments of rolling stock, train formations, etc. and verified...
In view of that Sync brake system of combined-train has a complex configuration and distributed control characteristic, an on-line diagnosis system based on multi-agent technique is designed. The diagnosis system is a two-level multi-agent system, in which diagnosis tasks are divided into simple tasks and accomplished by agents with collaboration. Based on the design of the diagnosis system, the key...
Multifunction vehicle bus (MVB) is a standard protocol defined in train communication network criterion, and used for transmitting information among various equipments inside the vehicle. In order to insure compatibility and inter-operability among the MVB equipment, it requires that the data transmitted in the bus need to be collected, and correctness and reliability of data transmission of the MVB...
Speed identification is crucial in speed sensorless induction motor drives. Because the voltage model involves pure integrator, which will cause initial value and drift problems. These problems and resistance varies effect the precision of speed identification. This paper presents an improved method, which uses high-pass filter to avoid these problems and adapt the cut-off frequency on-line to improve...
By analyzing the existence of unstable regions of the present adaptive observer using pole-placement technique in regenerating mode at low speeds, conditions that ensure the adaptive observer stability at full speed regions are got. An improved speed adaptive law and a novel method to choose the gain of the observer are proposed based on observer. By using the Lyapunov stability theory, speed identification...
A T-S model fuzzy modeling method based on satisfying degree function is presented for a class of complex systems. Using the sampling data, the model parameters are initialized by fuzzy clustering and its premise parameters are rectified by learning off-line using back-propagation algorithm. Introducing the conception of character satisfying degree function to rectify online the forgetting factor...
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