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In this paper, an on-line identification scheme is proposed to enhance the residual state error performance in face of disturbances. The proposed scheme is based on an e1-modification adaptive law for the weights to approximate the unknown nonlinearities with bounded error. Besides, an identification model with feedback is introduced to improve the state error performance. The feedback is based on...
A novel design of two-wheeled double inverted pendulum-like vehicle with a movable payload is presented in this paper. The developed design extends the abilities of the vehicle with five degrees of freedom. The increase of degrees of freedom provides the vehicle with more flexibility in maneuvering in narrow spaces and limited travel distances. The dynamic model of the system is derived using Euler-Lagrange...
Riblets have been considered as a passive method for drag reduction. Riblets are structures on a surface that run parallel to one another, which are aligned longitudinally to the flow. It has been shown experimentally that when the shape, spacing and height of the riblets are optimized, the drag coefficient over the surface can be reduced by up to 10%. These results have also been confirmed by direct...
This paper investigates several general friction models and applies different friction models to accurately simulate the propulsion of a capsule driven by an internally oscillating mass. The six published friction models are reviewed and are validated using the simulation studies. The simulation results are verified with a physical prototype in an experimentation test. The most accurate friction model...
This paper studies the key issue of fault tolerance for actively controlled railway wheelsets. It assesses failure modes in such systems, with a focus on actuator failures, and consequence of those hardware failures. It seeks to establish the necessary basis for control reconfiguration to ensure system stability and performance in the event of a faulty, without the need for hardware redundancies....
The goal of this paper is to develop a new approach for the Free Flight concept based on neighbouring Optimal Control (NOC) that can deliver an aircraft to its designated position safely and reliably when faced with conflicts, and to have some form of recovery measure when the pilot is faced with uncertainty that are due to wind and other uncertainties in the FF environment. The benefits of the algorithm...
this research paper will set out to explore the degree to which the practice of ISO 9001:2000 is used in Searle Pakistan limited in developing quality products that meets the customer requirement. The paper focuses on developing the understanding the operation and effectiveness of quality management systems and why companies are also committed to the needs of ISO9001:2000. A survey was conducted on...
In this paper we introduce new class of system, so called singularly impulsive or generalized impulsive dynamical systems with time delay. Dynamics of this system is characterized by the set of differential and difference equations with time delay, and algebraic equations. They represent the class of hybrid systems, where algebraic equations represent constraints that differential and difference equations...
Two-axis pan and tilt systems are widely used in surveillance applications for high accuracy positioning of sensor payloads such as cameras and laser pointers. In order to develop advanced control algorithms to improve the performance of these systems, a model of the system must be developed. This model should include the dynamics of the system to include effects such as compliance and account for...
The complex structure of the shaped surface formed by a kind of bars-converging single-layer reticulated shell joints is analysed, and the characteristic of higher precision in production is considered, the patter decomposing - patter processing - patter assembling -patter casting joint processing flow is put forward. According to the joint design data, the joint spatial axis model is built, the spatial...
With the digital technology and very large scale integrated circuit technology widely used, the structure and function of electronic devices are becoming more and more complex, the defects of contact diagnosis has become increasingly prominent for using the probe or needle bed, it demands people began to in-depth study the diagnostic techniques of PCB non-contact. Based on magnetic image of the PCB...
This paper presents a novel technique for the real time estimation of the contact conditions by using a combination of multi-Kalman filtering and fuzzy logic approach. The proposed solution exploits the variations in the dynamic behaviour of a railway wheelset with the changes in wheel-rail contact condition. The proposed system involves the use of multiple model based estimation of the wheelset dynamics...
This article is concerned with stability analysis of a linear discrete-time dynamic quantizer system with packet loss. First, several modifications are made to the original dynamic quantizer to make it easier to realize. Then communication channel subject to packet loss of Bernoulli distribution from the quantizer to the plant input is considered. Moreover, based on Lyapunov function approach, a sufficient...
This paper focuses on the robust H∞ control problem for a class of nonlinear switched systems containing neutral uncertainties with average dwell time (ADT). Uncertainties are assumed to be nonlinearly dependent on state and state derivative and allowed to appear in channels of state, control input and disturbance input. The robust H∞ control problem of the switched system with stabilizable and unstabilizable...
This paper aims to present an improved adaptive sliding mode control (ASMC) design for rigid spacecraft attitude maneuvers. An adaptive scheme is proposed for the switching gain calculation when the upper bound of the system uncertainty is unknown in advance. Unlike existing ASMC design, which may result in an over-adaptation of the upper bound when the initial system trajectory is located far from...
By analyzing the peer classification, structure, and configuration of juxtapose framework (JXTA), a mixed topology in a campus network environment is designed and implemented for peer-to-peer instant communication. A novel method of transmitting video data on JXTA overlap network is proposed, by which video can be included in JXTA applications. The feasibility is proved, furthermore, the performance...
In China, many traditional industrial processes need to be maintained and upgraded to incorporate new technology development. The paper reports our work in improvement of the traditional dyeing process using advanced network control technology. Based on a dyeing industry, we designed the network system of dyeing equipment using industrial Ethernet & Multi-bus technology. The system takes three-level...
The power management strategy can greatly affect the fuel economy of hybrid power systems. This work presents an optimization based power management strategy of hybrid fuel cell power sources during real-time operation. In this approach, local optimization strategy is adopted because it doesn't need the priori knowledge of the future power demand. Every step, the current power demand is measured and...
Based on total variation minimization (TV) algorithm and the theory of polynomial acceleration, we prompted a modified algorithm, which is called P-TV in this paper. This new algorithm has a better noise immunity and fewer iteration numbers than the traditional TV algorithm. P-TV algorithm can be divided into four steps. Compared to the traditional TV algorithm, the P-TV algorithm applies the theory...
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