This paper presents fault estimation scheme for one-sided Lipschitz and quasi-one-sided Lipschitz systems with disturbance. One-sided Lipschitz and quasi-one-sided Lipschitz systems are much more widely used nonlinear...
详细信息
ISBN:
(纸本)9781479947249
This paper presents fault estimation scheme for one-sided Lipschitz and quasi-one-sided Lipschitz systems with disturbance. One-sided Lipschitz and quasi-one-sided Lipschitz systems are much more widely used nonlinear systems than the well-known Lipschitz systems. An combination between adaptive observer and sliding mode observer is developed, which avoids the restrictions of these two types of observer. The fault can be estimated here by adaptive observer while the sliding mode is utilized to compensate the effects of the disturbance. An example is given to illustrate the effectiveness of this fault construction approach.
The emerging new idea of lane-keeping electronic stability control is investigated. In a critical situation, such as entering a road curve at excessive speed, the optimal behavior may differ from the behavior of tradi...
The emerging new idea of lane-keeping electronic stability control is investigated. In a critical situation, such as entering a road curve at excessive speed, the optimal behavior may differ from the behavior of traditional ESC, for example, by prioritizing braking over steering response. The important question that naturally arises is if this has a significant effect on safety. The main contribution here is to give a method for some first quantitative measures of this. It is based on optimal control, applied to a double-track chassis model with wheel dynamics and high-fidelity tire-force modeling. The severity of accidents grows with the square of the kinetic energy for high velocities, so using kinetic energy as a measure will at least not overestimate the usefulness of the new safety system principle. The main result is that the safety gain is significant compared to traditional approaches based on yaw rotation, for several situations and different road-condition parameters.
The increased traffic flow on both existing highways and city roads leads to the appearance of stop-and-go waves which have many disadvantages, e.g., increased risk of accidents, higher fuel consumption, increased pol...
详细信息
The increased traffic flow on both existing highways and city roads leads to the appearance of stop-and-go waves which have many disadvantages, e.g., increased risk of accidents, higher fuel consumption, increased pollution, increased wear of vehicle mechanical parts, driving stress and passenger discomfort. The platooning of vehicles could be the solution to this problem by enforcing them to follow each other and to maintain a safe distance between them. The advantages brought by this solution depend on ensuring the string stability of the vehicle platoon. In this paper the leader-follower system is employed to illustrate the stop-and-go waves mitigation. Several controllers (P, PI) were designed based on the conditions that have to be met in order to ensure the string stability of the vehicle platoon and comparisons were made with a controller based on the driver behavior.
The increased presence of Electric Vehicles (EVs) within electricity distribution systems introduces new challenges to their reliability, since uncoordinated charging of large numbers of EV can result in overload of d...
详细信息
ISBN:
(纸本)9781467360890
The increased presence of Electric Vehicles (EVs) within electricity distribution systems introduces new challenges to their reliability, since uncoordinated charging of large numbers of EV can result in overload of distribution lines or transformers. In order to manage this difficulty, entities called EV aggregators are introduced whose task is to schedule charging of the EV fleet while ensuring that network constraints are respected. In this paper we propose a solution method for the type of constrained optimization problems such aggregators must solve. Our method is simple to implement and is guaranteed to produce good and feasible solutions, while performing only lightweight centralized computations which do not require the use of additional - and often expensive - constrained optimization solvers. We show that the quality of solutions produced by our method improves as the number of EVs to be controlled is increased. In addition, the computation times remain very short even for large problem instances entailing several thousands EVs.
The study is dedicated to the autonomous feedback with brain entrainment,especially involving a user-friendly interface for the brainwave entrainment by variation in cardiac autonomic *** combination with the generati...
详细信息
The study is dedicated to the autonomous feedback with brain entrainment,especially involving a user-friendly interface for the brainwave entrainment by variation in cardiac autonomic *** combination with the generation of brainwave entrainment,the device has been verified to be capable of delivering relief from the pressure for *** platform includs several key *** example,the device can control a multi-channel oscillators from the variation of cardiac rhythmic to force the brain into a specific entrainment *** addition,the excitatory state of autonomic activity is reflected from the variation of cardiac rhythmic,which includes the overall level of autonomic activity,the potential from sympathetic and parasympathetic *** information on these activities will be used as the biofeedback of body status and is an evidence of interaction for more personalized *** platform can be embedded in beds,chairs,or others to provide an interactive experience.
The profound value of wayside monitoring in helping safeguard the reliability of rolling stock operations is undeniable. Hotbox wayside monitoring systems are used to detect faults in axle bearings with a significant ...
详细信息
The profound value of wayside monitoring in helping safeguard the reliability of rolling stock operations is undeniable. Hotbox wayside monitoring systems are used to detect faults in axle bearings with a significant number of installations throughout the UK railway network. However, hotbox wayside systems are prone to false alarms and faulty axle bearings can only be detected shortly after they have failed and before they seize. In this study a customised acoustic emission system has been used to detect artificially induced faults on actual axle bearings. The operation of the aforementioned system is based on the fact that the acoustic signal arising from the axle bearing fault is embedded in the noise produced by the wheelset. The signal is transmitted in the form of ultrasounds from the bearing to the acoustic emission sensors that are attached on the web using magnetic hold-downs. In this paper, a novel signal processing technique based on correlation is presented as a means of processing the acquired acoustic emission data. The acoustic emission measurements considered were carried out during tests on actual freight wagons with artificially damaged axle bearings in the Long Marston rail track, UK. The results show that the correlation processing technique can improve the overall capability of wayside bearing defect detection.
A unified framework based on discrete-time gradient-based extremum seeking control is proposed to localise an extremum of an unknown scalar field distribution using a group of equipped with sensors. The controller uti...
详细信息
A unified framework based on discrete-time gradient-based extremum seeking control is proposed to localise an extremum of an unknown scalar field distribution using a group of equipped with sensors. The controller utilises estimates of gradients of the field from local dithering sensor measurements collected by the mobile agents. It is assumed that distributed coordination which ensures uniform asymptotic stability with respect to a prescribed formation of the agents is employed. The framework is useful in that a broad range of nonlinear programming algorithms can be combined with a wide class of cooperative control laws to perform extreme source seeking. Semi-global practical asymptotically stable convergence to local extrema is established in the presence of bounded field sampling noise.
This paper describes a localization algorithm based on hybrid sensor system with application to an active shopping cart. For a given experimental environment, the probability localization method is applied to confirm ...
详细信息
ISBN:
(纸本)9781479969357
This paper describes a localization algorithm based on hybrid sensor system with application to an active shopping cart. For a given experimental environment, the probability localization method is applied to confirm the global coordinate of the target customer. And a hybrid sensor system combining the Zigbee and odometry is used to improve the localization performance of the active shopping cart. The shopping cart is equipped with motors for mobility and sensors for tracking person. Through experimental work, we corroborate the feasibility of the proposed localization algorithm.
This paper presents the development of Quadriceps muscle model by using Artificial Neural Network (ANN) and Adaptive Neuro Fuzzy Inference System (ANFIS) based on Functional electrical Stimulation (FES). The impacts o...
详细信息
This paper presents the development of Quadriceps muscle model by using Artificial Neural Network (ANN) and Adaptive Neuro Fuzzy Inference System (ANFIS) based on Functional electrical Stimulation (FES). The impacts of the output torque with different stimulation parameters (frequency, pulse width and sampling time) are investigated. These parameters will be used to develop the paraplegic muscle models. Muscle models developed are validated with the clinical data to evaluate the accuracy of the output torque predicted compare to the actual paraplegic muscle torque. From the study, ANN is found to be the most accurate model compare to ANFIS with the value of mean squared error of 0.3758. Both developed models in this study can be used in a various control strategies to control FES parameters during rehabilitation proses using FES.
Fe3Si/FeSi2 artificial lattices, wherein ferromagnetic (F)/antiferromagnetic (AF) interlayer coupling between the Fe 3Si layers were induced by controlling the thickness of FeSi 2 layers, were prepared on Si(111) subs...
详细信息
暂无评论