A new phase-shifting error compensating algorithm for phase-measuring profilometry is proposed. In this error detecting algorithm, it is supposed that sinusoidal fringe is projected to the plate, thus the phase differ...
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A new phase-shifting error compensating algorithm for phase-measuring profilometry is proposed. In this error detecting algorithm, it is supposed that sinusoidal fringe is projected to the plate, thus the phase differences between adjacent pixels are equal. Three adjacent phase points are taken as the research object. Combining the principle of phase compensation measurement, each phase of the point is presented as an equation containing the phase-shifting error. According to the characteristics that the phase differences between adjacent pixels are equal, an equation to calculate the phase-shifting error is constructed. Then the phase shifting error is taken into account in the original algorithm for error compensation. Simulation results show the inhibitory effect of the error compensation by using the novel algorithm. The proposed algorithm is also used for three-dimensional reconstruction. The final result shows that the new compensation algorithm is better than the original one obviously. This error compensating algorithm can effectively improve the accuracy of three-dimensional measurement.
For nonlinear differential-algebraic equations subsystems satisfying linear growth conditions, the problem of output feedback stabilization control is considered in this paper. The design of the state observer and tha...
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For nonlinear differential-algebraic equations subsystems satisfying linear growth conditions, the problem of output feedback stabilization control is considered in this paper. The design of the state observer and that of the controller are coupled. The proposed observer is non-initialized and linear which robustify the observer. Based on Backstepping approach, a linear dynamic output compensator is constructed, through which the whole closed-loop systems are asymptotically stable. The simulation results demonstrate the effectiveness of the proposed control scheme.
In real-life, many practical applications involve agents that are nonlinear and nonholonomic. This paper investigates output synchronization of multiple mobile agents in a plane. The output synchronization of mobile a...
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ISBN:
(纸本)9781424464500;9781424464531
In real-life, many practical applications involve agents that are nonlinear and nonholonomic. This paper investigates output synchronization of multiple mobile agents in a plane. The output synchronization of mobile agent's aims are two aspects: making the speed of each agent synchronized and tracking desired trajectories in a group. First, each agent dynamics is described by an affine control system and the communication topology among the agents is represented by a digraph. Using adjacent information and incidence matrix, a decentralized control law is acquired, which is composed of alignment control and cohesion control. Second, the stability of the group is proved by the decentralized control law and the synchronization control objective is realized. Finally, ten mobile agents are simulated to show the effectiveness of the present control law.
In the real world,every nonlinear system is inevitably affected by *** an example,a logistic map driven by white noise is *** previous studies which focused on the behavior under local parameters to find analytical re...
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In the real world,every nonlinear system is inevitably affected by *** an example,a logistic map driven by white noise is *** previous studies which focused on the behavior under local parameters to find analytical results,we investigate the whole driven logistic *** a white noise driven logistic map,its nondivergent interval decreases with increasing white *** white noise does not change the equilibrium point and two-cycle intervals in statistics,if the driven logistic map is kept *** particular,chaos can be excited by white noise only after the four-cycle bifurcation *** latest result is a necessary condition which has not been given in the literature[*** 18 (2008) 509],and it can be deduced from Sharkovsky's *** simulations prove these analytical results.
The memory state feedback control problem for a class of discrete-time systems with input delay and unknown state delay is addressed based on LMIs and Lyapunov-Krasovskii functional method. Under the action of our des...
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The memory state feedback control problem for a class of discrete-time systems with input delay and unknown state delay is addressed based on LMIs and Lyapunov-Krasovskii functional method. Under the action of our designed adaptive control law, the unknown time-delay parameter is included in memory state feedback controller. Using LMI technique, delay-dependent sufficient conditions for the existence of the feedback controller are obtained. Finally, the effectiveness of the proposed design method is demonstrated by a numerical example.
This paper addresses the control problem of a class of complex dynamical networks with each node being a Lur'e system whose nonlinearity satisfies a sector condition, by applying local feedback injections to a small ...
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This paper addresses the control problem of a class of complex dynamical networks with each node being a Lur'e system whose nonlinearity satisfies a sector condition, by applying local feedback injections to a small fraction of the nodes. The pinning control problem is reformulated in the framework of the absolute stability theory. It is shown that the global stability of the controlled network can be reduced to the test of a set of linear matrix inequalities, which in turn guarantee the absolute stability of the corresponding Lur'e systems whose dimensions are the same as that of a single node. A circle-type criterion in the frequency domain is further presented for checking the stability of the controlled network graphically. Finally, a network of Chua's oscillators is provided as a simulation example to illustrate the effectiveness of the theoretical results.
In order to improve the face recognition performance using Gabor wavelet, a multi-channel dimension reduction scheme (MDRS) employing PCA algorithm is proposed. In addition, the selection of scales and orientations in...
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Mass flow rate is an important parameter of oil/gas/water three‐phase flow, most multi‐phase flow meters are based on the measurement of total mass flow rate and phase fraction. As the Reynolds number of three‐phas...
Mass flow rate is an important parameter of oil/gas/water three‐phase flow, most multi‐phase flow meters are based on the measurement of total mass flow rate and phase fraction. As the Reynolds number of three‐phase flow grows to a certain number, the oil and water phase are considered as a homogenous mixture with a mixed density. In this case, oil/gas/water three‐phase flow could be measured as gas/liquid two‐phase flow. A V‐cone flow meter with beta ratio of 0.65 is used to make the mass flow rate measurement, the calibration experiment is carried out with oil/water flow, the effect of oil proportion and the mixture Reynolds number on the discharge coefficient of V‐cone flow meter is discussed. Comparison of four typical differential pressure correlations is put forward under experiment condition. Lin correlation best behaved in the experiment and error analysis is done based on it. The experiment result shows the mass flow rate of oil/gas/water flow could be measured by V‐cone flow meter efficiently and the experiment error is acceptable.
A conductance probe which can be used to measure parameters of gas-liquid two phase flow is designed and constructed in this paper. The proposed conductance probe consists of ring electrode pairs placed on the interna...
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Gas-water two-phase flow is of significance in industrial process and scientific research field. Its flow regime determines the flow parameters and the method of flow measurement. Precise identification of flow regime...
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