The effect of cochannel interference on the performance digital mobile radio systems in a Nakagami (1960) fading channel is studied. maximal ratio combining (MRC) diversity analyzed presence multiple equal-power interferers and additive white Gaussian noise. Closed-form expressions are derived for average probability error as well outage both coherent noncoherent (differentially coherent) binary frequency-shift keying phase-shift schemes an environment with results expressed terms confluent...

The low energy conversion efficiency of electromagnetic acoustic transducers (EMATs) is a critical issue in nondestructive testing applications. To overcome this shortcoming, butterfly coil EMAT was developed and optimized by numerical simulation based on 2-D finite element model. First, the effect structural parameters investigated orthogonal test theory. Then, modified designed that consists three-square permanent magnets with opposite polarity (TSPM-OP) to enhance signal amplitude....

Wire breakage is a major factor in the failure of prestressed concrete cylinder pipes (PCCP). In presented work, an automatic monitoring approach broken wires PCCP using fiber-optic distributed acoustic sensors (DAS) investigated. The study designs 1:1 prototype wire break experiment DN4000 mm buried underground simulated test environment. combines collected signals with previously noise operating pipe and transforms them into spectrogram as signal dataset. A deep learning-based target...

The effect of correlated lognormal shadowing on the average probability error performance narrow-band mobile communication systems with micro- and macrodiversity reception in a Rician fading channel is studied by considering constant correlation model for shadowed signals at base stations. degradation due to illustrated both coherent differentially binary phase-shift keying schemes. Numerical results presented show that when stations cellular system are very closely spaced, cannot be ignored.

Free vibration of a magnetoelectroelastic plate resting on Pasternak foundation is investigated based Mindlin theory. The in-plane electric and magnetic fields can be ignored for plates. According to the Maxwell equation magnetoelectric boundary condition, variation potentials along thickness direction determined. Using Hamilton’s principle, governing equations motion are derived. Numerical results reveal effects potentials, spring shear coefficients frequency. These may useful in analysis...

The effect of cochannel interference on the performance digital mobile radio systems in a Nakagami-fading channel is studied. Closed-form expressions are derived for average probability error both coherent and noncoherent (differentially coherent) binary frequency shift keying phase-shift schemes an interference-limited system. analysis assumes arbitrary number independent identically distributed Nakagami interferers. maximal ratio combining diversity also examined.

This paper demonstrates an active vibration control system of flexible structures by using piezoelectric sensors and actuators. A set equations, sensing equations actuating are derived through the modal theory for structures, then model is converted into state space form. With recent developments in sensors/actuators technologies, many researchers have concentrated on methods suppressing smart materials such as transducers (PZT). In this paper, two patches collocated both sides same position...

The study of the applications piezoelectric materials in active vibration control flexible structures has been ongoing for more than a decade. Based on Linear Quadratic Gauss (LQG) optimal method, paper introduces an effective procedure to suppress with sensors/actuators are symmetrically collocated both sides same position host structure. model intelligent cantilever beam is built by application ANSYS software, and through modal analysis, first 4 ranks frequencies shapes extracted....

Considerable attentions have been devoted recently to active vibration control using intelligent materials as sensors/actuators. This paper presents results on schemes for suppression of flexible cantilever beam with bonded piezoelectric sensors and actuators. State equations which the generalized modal coordinates variables are built.With elements surface-bonded near same position fixed end beam, two methods such Linear Quadratic Gauss (LQG) optimal robust H∞ investigated. Finally,...

According to analyzing the principle and limitations of RED its improved algorithms, an adaptive congestion control mechanism is proposed in this paper, which imposes nonlinear smooth for packet loss rate function algorithm by using membership ascend demi-cauchy fuzzy distribution. The speed growth relatively slow near minimum threshold, while maximum threshold faster. ThePmax will be dynamically adjusted length average queue target adapting changing network environment. NS simulation shows...

This article presents a tracking control approach with obstacle avoidance for mobile robot. The law is composed of two parts. first discrete-time model predictive method-based trajectory that derived using an optimal quadratic algorithm. second part the strategies switch according to different designed regions. controllability analyzed. simulation results validate effectiveness proposed considering both and avoidance.

In this paper, we study the limit behavior of smooth solution for a reduced vectorial quantum Zakharov system which describes interaction between Langmuir waves and ion-acoustic in plasmas. We first give local existence uniqueness to system. Then derive uniform bounds with appropriate initial data, prove that converges nonlinear Schrödinger

In this work, we generalize the idea of Ginzburg-Landauapproximation to study existence and asymptotic behaviors ofglobal weak solutions one dimensional periodical fractionalLandau-Lifshitz equation modeling soft micromagnetic materials.We apply Galerkin method get an approximate solution and, toget convergence nonlinear terms introduce thecommutator structure take advantage special structures theequation.

Based on fuzzy control theory, a new method for 3- Degree-of-freedom (DOF) parallel robot is presented in this paper. Take example DELTA robot; input the established physical model Pro/E into simulation software ADAMS to establish its mechanical system by seamless interface MECH/Pro, where can do kinematics and dynamics simulation. Build controller use of MATLAB software. Realize co-simulation accordance with given target trajectory ADAMS/MATLAB The results analysis shows that has solved...

The energy conversion of electromagnetic acoustic transducers (EMATs) is typically lower, which seriously restricts the application EMATs in field non-destructive testing and evaluation. In this work, parameters surface wave EMATs, including structural electrical parameters, are investigated using orthogonal test method to improve transducer's efficiency. Based on established finite element 2-D model amplitude displacement components at observation point a plate optimization objective be...

Abstract This paper considers a single-layer fourth order quasi-geostrophic equation in two-dimensional case. We prove the existence and uniqueness of global smooth solution to Cauchy problem this by using energy estimate. also establish new estimate for nonlinear term obtain decay estimates $$L^{2}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>L</mml:mi> <mml:mn>2</mml:mn> </mml:msup> </mml:math> .

Stochastic non-Newtonian fluids with multiplicative noise are studied under the case of shear thinning and thickening existence martingale solutions stationary is achieved for first time.

The average bit error rate (BER) performance of an adaptive antenna array system with the optimum combining scheme that maximizes output signal-to-interference-plus-noise ratio (SINR) is analyzed. BER expressions are easy to evaluate numerically derived for a generalized fading environment co-channel interference and Gaussian noise. Specifically, we assume such channel may be characterized by spherically invariant random process (SIRP), received signal envelope following Nakagami-m (1960)...