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An experimental measurement method used to build the two-port model of the silencer based on the least square method (LSM) was developed here. The quantitative relationship between the parameters of the transfer matrix of the silencer and the sound pressure measured at the certain position in an experimental duct system was researched. A silencer and a measurement duct system are designed and established...
Now, 2-D DCT is applied widely in the field of signal processing. But the transform is operated by twice 1-D DCT successively, which limits the operation efficiency to improve farther. To overcome such drawbacks, a new method based on parallel computing is proposed in the paper. First, a sort of new matrix operation algorithm and a new transform matrix are defined in the interest of convenient parallel...
In this study, we have numerically examined the effect of applied bias on the transmission across Dimer Fibonacci Height Barrier Superlattices (DFHBSL) by using the exact airy function formalism and the transfer matrix technique. We have observed the formation of miniband structure and disappearance of the singularly localised states in the Structure of Dimer Fibonacci in height barrier superlattices...
Performance of planned shipboard distribution/generation systems can be affected by power fluctuations and inappropriate control strategies. A measure of observability of such systems will allow one to quantify their operational performance. This paper attempts to account for observability of these systems through the incorporation of nonlinear dynamics of converters and electromechanical behavior...
Active control of a flexible beam is investigated using time-delayed piezoelectric actuator. A minimization problem is formulated that consists of finding the control voltage applied to a piezoelectric patch actuator which suppresses the dynamic responses of the beam at a specified terminal time with least control effort. The solution method is based on a combination of modal expansion and direct...
Without any additional element, noncontinuous deformation of body can be simulated efficiently by interface element. The element stiffness matrix and interface stress are derived, which is based on the principle of virtual work. The steps given in the theoretical development were implemented in the computer program. A homogeneous cantilever beam and a composite structure were taken for examples to...
Aiming at the fuzzy and correlation among technical evaluation indexes in the water resources project design scheme, the paper studied the decision-making problem of system design scheme. Based on the preferred subjection degree and grey incidence, the method of improving grey incidence fuzzy decision-making was proposed. It aimed to seek the optimal design scheme of complex systems from the whole...
In this paper, we analyze a discrete time queueing system with geometrical arrivals of both positive and negative customers in which the server works at a lower rate during working vacation. Using embedded Markov chain and the matrix analysis solution method, we derive the probability generating function (PGF) of the number of customers waiting in the system and stationary queue length. From the process...
The convergence evaluation of the discrete linear quadratic regulator (DLQR) to map the Z-stable plane, is the main target of this research that is oriented to the development of tuning method for multivariable systems. The tuning procedures is based on strategies to select the weighting matrices and dynamic programming. The solutions of DLQR are presented, since Bellman formulations until Riccati...
The technique of curvilinear boundary-fitted coordinate system is used for the mathematical model of pressure underground seepage flow and the boundary conditions and the method of solving the transformed equations have been presented. The computing example shows that the computed hydraulic parameters conform to the physical laws. Compared with the finite element method, the presented method need...
Based on Newton dynamics mechanics theory make a study of two-wheeled self-balancing robot, a detailed mathematical model of the modeling process is provided, and then, using the reasonable method, a linear state-space equations is built up. After that, the LQR controller and state-feedback controller based on pole placement theory are both designed. After a number of simulation experiments, we get...
The solution of large sparse network equations is a recurrent problem in almost every algorithm of power system simulation, which is widely used in offline analysis, online stability assessment and control. Nowadays, processor architectures are moving toward the integration of more cores on one chip, whilst traditional serial and parallel software can not fully exploit the performance of multi-core...
Time delay estimation (TDE) is one of the traditional methods in source location. TDE is used to derive the time difference of signal propagation from the source to the spatially separated sensors. Based on TDE a location algorithm of four-element array is express by matrix under the condition of low altitude and far field moving target. The best structure of four-element arbitrarily acoustic array...
Fault simulation is one of the main components of dynamic electric power system simulation programs. In this work, a fault-branch based admittance matrix was used to simulate a variety of multiple symmetrical or asymmetrical faults in unified dynamic power system simulation software. Admittance matrix contraction was employed to process multiple faults and random faults. An important feature of this...
In this work, a transformation to a square matrix named sweep operator is proposed to obtain multiple and partial coherence estimates. This operator does not require the inversion of the spectral matrices commonly involved in coherence estimation and hence may be useful in applications such as in embedded systems, where memory use is a critical issue. The technique was evaluated in electroencephalographic...
A new calibration algorithm for multi-camera systems using a small 3D reference rig is proposed. Extrinsic and intrinsic parameters of the cameras are recovered only by capturing the reference rig placed at different locations. Thus the proposed method yields a simple calibration means for multi-camera systems while not using large reference rig, which should occupy the image capture volume as full...
We consider the problem of latency-optimizing file splitting for transmission over a large multi-hop network. We utilize recent results from random matrix theory to analytically express the latency distribution as a function of the relevant network parameters and the file size. The resulting minimax problem can be solved using standard nonlinear programming techniques for a variety of latency metrics...
In order to increase the efficient spectrum usage and to mitigate the current spectrum scarcity, dynamic spectrum access is considered to be an emerging technique. In this paper, based on the concept of dynamic spectrum access, we propose a Markov process that models the two-way interaction process between a primary and a cognitive radio user for dynamic spectrum usage. Several probabilities and matrices...
Dolecek et al. introduced the cycle consistency condition, which is a necessary condition for cycles - and thus the absorbing sets that contain them - to be present in separable circulant-based (SCB) LDPC codes. This paper introduces a cycle consistency matrix (CCM) for each possible absorbing set in an SCB LDPC code. The CCM efficiently enforces the cycle consistency condition for all cycles in a...
The construction of time-periodic stabilizing matrices by the monodromy matrix approach is presented, the time-periodic stabilizing matrices are a special case of time-varying stabilizing matrices formulated in the Brockett problem, a open problem in control theory; a practical example about construction of time-periodic stabilizing matrix for the vertical stabilization of the pendulum with oscillating...
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