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Fuel starvation during PEMFC (proton exchange membrane fuel cell) operations can produce serious irreversible damages. A large over-pressure, i.e., the differential pressure between the anode and cathode, would damage the proton exchange membrane like causing pinholes and reducing the performance of PEMFC. In order to ensure the safe and stable operation of PEM fuel cell, this paper proposes a fuel...
In order to meet modeling accurately and fault simulation required, according to the working principle of Solid Oxide Fuel Cell(SOFC) Generated Elections System, dividing function module, analyzing which fault modes, building fault mathematical model and verifying model. The result shows the SOFC system fault model reflect the relation among the different module clearly and simulate fault mode effective...
This paper presents a novel fractional order sliding mode control strategy for a quadrotor unmanned aerial vehicle attitude and altitude stabilization. A saturated dynamic model is first obtained via Euler-Lagrange mechanics and coordinate translation. By introducing fractional order calculus, the newly presented control law can achieve fast convergence speed. In addition, with the help of bounded...
In this paper, we study an electricity load scheduling problem in a household with PV system according to the relationship of size between the Feed in Tariff(FIT) tariffs and time-of-use(TOU) pricing. Compared with previous works in which PV energy is either fully consumed by customers or fully exported to the main grid due to smaller or larger FIT than electricity price, we consider the PV energy...
Hybrid electric vehicles are one of the most practicable technologies in the automobile industry to conserve resources and to protect the environment. Mode transitions between different modes are critical to improve fuel economy and driving performances. Due to the response delay of the engine and the engagement of the clutch, smooth transitions are sometimes difficult to achieve. Fuzzy sliding mode...
In this paper, we focus on the output regulation problem with dissipative property for a class of switched stochastic delay systems via average dwell time (ADT) approach. Dissipativity reduces the conservatism by considering the energy change of external input. A auxiliary matrix is introduced to weaken the general constraint on dissipativity parameter matrixes. Less conservative conditions are established...
Spacecraft positioning mechanism is widely used in spacecraft general assembly. As the key part of large module docking and disassembling technology, the positioning mechanism carries out the numeric identifying process and controls the module of a spacecraft to aim its base with positioning system and an automatic sling. The mechanism is designed to have the function of centroid capturing and automatic...
Most existing fault diagnosis approaches based on Petri net are applied in transmission network, and usually utilize the action information of relay protection and breaker to form the diagnosis model which is not suitable for radial distribution network. In this paper, a novel Petri net model based on fault information of FTUs is proposed. The rapidity and fault tolerance of distribution network fault...
Reluctance actuators are thought to be a good solution for the nano-precision stage to provide high acceleration as a kind of feedforward actuator in the next generation lithography. However, hysteresis has a significant impact on the accuracy of reluctance actuators. There are many methods to model the hysteresis, among which Prandtl-Ishlinskii (PI) model is the most popular one. To effectively control...
In this paper, consider the effect of the load inertia fluctuation for surface-mounted permanent magnet synchronous motor (SPMSM), the problem of dynamic response of SPMSM is studied. A backstepping control algorithm based on disturbance observer (DO) is proposed. Firstly, according to the equation of motor speed, the minimum-order observer is established to observe the disturbance value of load inertia,...
Aiming at the problem that the fault feature information of the Fan bearing is often overwhelmed by the strong background noise; this paper proposes to use the Improved Mathematical Morphological Undecimated Wavelet to extract fault characteristics. M Mathematical Morphological Undecimated Wavelet has morphological filtering characteristics and wavelet decomposition of multi-resolution characteristics...
For the poor operation reliability and low economic benefit of wind-photovoltaic generation system in microgrid, an optimal capacity configuration method based on gravitational search algorithm (GSA) is proposed in this paper, to increase reliability and economic benefits of combined wind-solar-storage system in microgrid. Based on power output models of different types of renewable power resources,...
As more and more distributed generations are connected to the grid, the features of micro grid, are no longer the same as conventional grids. A micro-grid fault diagnosis method based on redundant Petri net considering temporal constraints is put forward in this paper. Firstly, a tripartite criterion for fault location is proposed on basis of Wide-area information protection method. Secondly, The...
Networked control is now widely used in engineering systems. We have studied networked supervisory control of discrete event systems in several previous papers. In this paper, we investigate the issue of blocking in networked supervisory control. Due to randomness in communication delays, the issue of blocking is much more complex in networked systems. More conditions need to be satisfied in order...
This paper aims to develop a framework for vehicle type classification using convolutional neural network based on vehicle rear view images. Compared with the extraction of the appearance features from vehicle side view and frontal view images, there has been relatively little research on vehicle type classification by using vehicle rear view images' information. The vehicle rear view images are detected...
Lane detection is one important process in the vision-based vehicle assist system. The results of lane edge detection play an important role in feature-based lane detection. The complicated conditions of road make the correct edge detection of lane markings become very challenging. In order to get an ideal edge of lane markings in road image, a method of lane edge detection based on Canny algorithm...
This paper proposes a joint source channel-coding scheme based on a multi-encoder and inertial navigation module to solve the problem of poor wireless channel environment and high bit error rate. The encoder consists of three independent channels from the same source encoding the video imager for different H.264 encoding compression ratio. The propsed scheme aims to improve the system robustness under...
To construction effective simulation meta-models for complex physical simulation system, the “curse of dimension” and the “uncertain and imprecise information” problems have to be addressed firstly. Although simulation meta-models based on neural networks can obtain well performance, the fuzzy inference mechanism of domain expert for practical application problems cannot be simulated. Thus, some prediction...
Although many articles have shown that the control performance of interval type-2 fuzzy logic controllers (IT2 FLCs) is better than type-1 FLCs, the computational cost of it is high, which makes it hard to develop in the real world. Our previous research has recommended six TR approaches for their efficiency, but which one has the best performance is still an unknown problem. In the paper, IT2 FLCs...
This paper addresses the stability results of a Markov jump linear system with parameter uncertainties and time-varying delay. A geometric sequence based method is used for delaypartitioning. Then, a modified geometric sequence division (GSD) dependent augmented Lyapunov-Krasovskii functional (LKF) is constructed with respect to the state variables forming in geometric progression. By employing the...
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