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An energy-based Stochastic Model for Wireless Sensor Networks

Wireless Sensor Network 2011年第9期3卷 322-328页

作者： Yuhong Zhang Wei Li 不详

We propose an energy-based stochastic model of wireless sensor networks (WSNs) where each sensor node is randomly and alternatively in an active and a sleep mode. We first investigate the sensor model and derive the formula of the steady-state probability when there are a number of data packets in different sensor modes. We then determine important sensor’s performance measures in terms of energy consumptions, average data delay and throughput. The novelty of this paper is in its development of a stochastic model in WSN with active/sleep feature and the explicit results obtained for above mentioned energy consumption and performance characteristics. These results are expected to be useful as the fundamental results in the theoretical analysis and design of various hybrid WSNs with power mode consideration.

关键词： energy Efficiency Wireless Sensor Networks energy-based Stochastic Model

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A work-hardening and softening constitutive model for sand:modified plastic strain energy approach

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Acta Mechanica Sinica 2005年第1期21卷 76-86页

作者： FanglePeng M.S.A.Siddiquee ShaomingLiao DepartmentofGeotechnicalEngineering TongiiUniversityShanghai200092China DepartmentofCivilEngineering TheUniversityofTokyoTokyo1138656Japan DepartmentofGeotechnicalEngineering TongiiUniversityShanghai200092China//DepartmentofCivilEngineeringTheUniversityofTokyoTokyo1138656Japan

The paper describes an energy-based constitutive model for sand, which is modified based on the modified plastic strain energy approach, represented by a unique relationship between the modified plastic strain energy and a stress parameter, independent of stress history. The modified plastic strain energy approach was developed based on results from a series of drained plastic strain compression tests along various stress paths on saturated dense Toyoura sand with accurate stress and strain measurements. The proposed model is coupled with an isotropically work-hardening and softening, non-associtated, elasto-plastic material description. The constitutive model concerns the inherent and stress system-induced cross-anisotropic elastic deformation properties of sand. It is capable of simulating the deformation characteristics of stress history and stress path, the effects of pressure level, anisotropic strength and void ratio, and the strain localization.

关键词： Sand energy-based Hardening and softening Elasto-plastic model Stress-strain relation

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Longitudinal Vibration Analysis of Elastically Coupled Nanorods System with General Boundary Supports

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Sound & Vibration 2019年第2期53卷 16-28页

作者： Deshui Xu Jingtao Du Yuhao Zhao College of Power and energy Engineering Harbin Engineering UniversityHarbinChina

In this paper,an accurate series solution for the longitudinal vibration analysis of elastically coupled nanorods system is established,in which artificial springs are introduced to simulate such general coupling and boundary *** formulation is derived for the description of axial dynamics of multiple coupled nanorods based on Eringen nonlocal *** each nanorod component,its longitudinal vibration displacement function is invariantly assumed as the superposition of Fourier series and boundary smoothed supplementary polynomials,with the aim to make all the spatial differential sufficiently continuous across each *** the unknown coefficients are determined in conjunction with Rayleigh-Ritz procedure to solve a standard eigenvalue *** results are presented for the particular cases of twonanorod and three-nanorod systems to demonstrate the correctness and effectiveness of the proposed *** agreements can be repeatedly observed in comparison with those from other approaches available in *** on the model established,influence of elastic boundary and coupling conditions on the longitudinal modal characteristics of multiple nanorods system is investigated and *** work can provide an efficient energy-based modeling framework for longitudinal vibration analysis of elastically connected nanorod system with complicated boundary conditions.

关键词： Longitudinal vibration nanorods system elastic boundary and coupling energy-based method

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