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主动控制起落架建模与仿真

系统仿真学报 2008年第22期20卷 6261-6264,6272页

作者：王海涛 w.g.price 李为吉万小朋西北工业大学航空学院陕西西安710072 School of Engineering Sciences University of Southampton School of Engineering Sciences University of Southampton

建立了主动控制起落架系统的非线性模型和控制方程,对系统进行了稳定性分析,应用simulink对起落架主动控制系统进行了仿真,结果表明通过应用主动控制起落架系统,减小了飞机重心的垂直位移和起落架传递给机身的载荷,对提高飞机的滑行品... 详细信息

建立了主动控制起落架系统的非线性模型和控制方程,对系统进行了稳定性分析,应用simulink对起落架主动控制系统进行了仿真,结果表明通过应用主动控制起落架系统,减小了飞机重心的垂直位移和起落架传递给机身的载荷,对提高飞机的滑行品质、提高乘客的舒适性、改善民用飞机在低等级机场上以及军用飞机在修复类或损坏类跑道上的使用等有着重要的意义。

关键词：主动控制起落架振动冲击缓冲器

A PROgRESSIVE METHOD OF POwER FLOw ANALYSIS FOR COMPLEX COUPLED DYNAMIC SYSTEMS

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A PROGRESSIVE METHOD OF POWER FLOW ANALYSIS FOR COMPLEX COUP...

第四届海内外青年设计与制造科学会议

作者： J.T.Xing w.g.price Institute of Engineering Mechanics Shandong University of Technology Post Code 250061 Jinan China School of Engineering Sciences Ship Science University of Southampton SO17 1BJ UK Southampton UK

＜正＞generalized Equivalent Mobility is proposed to characterize the dynamic coupling behavior between substructures and subsystems consisting of several substructures in the overall *** this based,a power flow progressive approach is developed to predict the transmitted power flows between any interfaces of the assembly system and into the substructure of *** developed method can greatly reduce the complexity of the power flow analysis for complex dynamic coupled *** is applicable to a very large class of dynamical coupling systems with elastic and / or rigid substructures subject to multiple excitations in *** demonstrate the applications of the method,a complicated coupling vibration isolation system with stiffened plate-like foundation subject to multiple excitations is *** power flow transmission behaviors of this coupled system are obtained and discussed.

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随机干扰对非线性耦合系统联立共振的影响

固体力学学报 1988年第2期 121-132页

作者：戴德成 w.g.price 南京工学院 Brunel University England

本文研究随机干扰对非线性耦合系统联立共振的影响。首先使用随机平均法,给出非线性系统特性的近似概率分布。其次使用Monte Carlo数值模拟方法研究了上述系统。两者结论相当一致。结果证明随机平均法是分析随机干扰和确定性干扰联合作... 详细信息

本文研究随机干扰对非线性耦合系统联立共振的影响。首先使用随机平均法,给出非线性系统特性的近似概率分布。其次使用Monte Carlo数值模拟方法研究了上述系统。两者结论相当一致。结果证明随机平均法是分析随机干扰和确定性干扰联合作用下非线性系统响应的有力工具之一。在研究随机干扰作用的影响以前,首先研究了确定性非线性耦合系统联立共振的存在问题。

关键词：随机干扰 FP 戴德方程慢变量确定性干扰非线性耦合系统

A NUMERICAL METHOD FOR SIMULATINg NONLINEAR FLUID-RIgID STRUCTURE INTERACTION PROBLEMS

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Acta Mechanica Solida Sinica 2005年第2期18卷 95-109页

作者： price w.g. The School of Engineering Sciences Ship ScienceUniversity of SouthamptonSouthampton SO17 1BJEngland

A numerical method for simulating nonlinear fluid-rigid structure interaction problems is developed. The structure is assumed to undergo large rigid body motions and the fluid flow is governed by nonlinear, viscous or non-viscous, field equations with nonlinear boundary conditions applied to the free surface and fluid-solid interaction interfaces. An Arbitrary-LagrangianEulerian (ALE) mesh system is used to construct the numerical model. A multi-block numerical scheme of study is adopted allowing for the relative motion between moving overset grids, which are independent of one another. This provides a convenient method to overcome the difficulties in matching fluid meshes with large solid motions. Nonlinear numerical equations describing nonlinear fluid-solid interaction dynamics are derived through a numerical discretization scheme of study. A coupling iteration process is used to solve these numerical equations. Numerical examples are presented to demonstrate applications of the model developed.

关键词： fluid-structure interaction nonlinear numerical analysis ALE description overset grids flow around bluff-body

Dissipative free-surface solver for potential flow around hydrofoil distributed with doublets

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Applied Mathematics and Mechanics(English Edition) 2012年第11期33卷 1467-1480页

作者：陈志敏 w. g. price Ship Science University of Southampton

A doublet integral equation is formulated for the two-dimensional dissipative potential flow around a hydrofoil submerged below a free-water surface. The free-water surface is assumed to involve energy dissipation, and thus it is the source of damping. A doublet panel method is developed from incorporation of the dissipative green function approach and the doublet distributions on the hydrofoil surface. Numerical computations are implemented, and the derived numerical results are in good agreement with analytic solutions and experimental measurements.

关键词： panel method potential flow free-surface wave energy dissipation hydro-foil

An SPH Framework for Earthquake-Induced Liquefaction Hazard Assessment of geotechnical Structures

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 251-277页

作者： Sourabh Mhaski g.V.Ramana Department of Civil Engineering Indian Institute of Technology DelhiNew Delhi110016India

Earthquake-induced soil liquefaction poses significant risks to the stability of geotechnical structures *** understanding of the liquefaction triggering,and the post-failure large deformation behaviour is essential for designing resilient *** present study develops a Smoothed Particle Hydrodynamics(SPH)framework for earthquake-induced liquefaction hazard assessment of geotechnical *** coupled flowdeformation behaviour of soils subjected to cyclic loading is described using the PM4Sand model implemented in a three-phase,single-layer SPH framework.A staggered discretisation scheme based on the stress particle SPH approach is adopted to minimise numerical inaccuracies caused by zero-energy modes and tensile ***,non-reflecting boundary conditions for seismic analysis of semi-infinite soil domains using the SPH method are *** numerical framework is employed for the analysis of cyclic direct simple shear test,seismic analysis of a level ground site,and liquefaction-induced failure of the Lower San Fernando *** agreement for liquefaction triggering and post-failure behaviour demonstrates that the SPH framework can be utilised to assess the effect of seismic loading on field-scale geotechnical *** present study also serves as the basis for future advancements of the SPH method for applications related to earthquake geotechnical engineering.

关键词： Earthquake seismic liquefaction stress particle PM4Sand smoothed particle hydrodynamics(SPH)

A novel method for clustering cellular data to improve classification

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Neural Regeneration Research 2025年第9期20卷 2697-2705页

作者： Diek w.wheeler giorgio A.Ascoli Center for Neural Informatics Structures&PlasticityKrasnow Institute for Advanced Study Bioengineering Department Volgenau School of Engineering george Mason University FairfaxVAUSA

Many fields,such as neuroscience,are experiencing the vast prolife ration of cellular data,underscoring the need fo r organizing and interpreting large datasets.A popular approach partitions data into manageable subsets via hierarchical clustering,but objective methods to determine the appropriate classification granularity are *** recently introduced a technique to systematically identify when to stop subdividing clusters based on the fundamental principle that cells must differ more between than within *** we present the corresponding protocol to classify cellular datasets by combining datadriven unsupervised hierarchical clustering with statistical *** general-purpose functions are applicable to any cellular dataset that can be organized as two-dimensional matrices of numerical values,including molecula r,physiological,and anatomical *** demonstrate the protocol using cellular data from the Janelia MouseLight project to chara cterize morphological aspects of neurons.

关键词： cellular data clustering dendrogram data classification Levene's one-tailed statistical test unsupervised hierarchical clustering

genistein:a possible solution for the treatment of Alzheimer’s disease

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Neural Regeneration Research 2025年第10期20卷 2903-2905页

作者： Karolina Pierzynowska Bartosz Karaszewski grzegorz węgrzyn Department of Molecular Biology University of GdanskGdanskPoland gdansk Polandand Department of Adult NeurologyFaculty of MedicineMedical University of GdanskGdanskPoland

Neurodegenerative diseases are defined as disorders resulting from the slow and progressive loss of function and eventual death of neural cells that result from the primary pathology of nervous *** can lead to severe nervous system dysfunction,eventually affecting multiple organs and *** hundred neurodegenerative diseases have been described,and owing to their prevalence,severity.

关键词： organs Alzheimer death

Stepping up after spinal cord injury:negotiating an obstacle during walking

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Neural Regeneration Research 2025年第7期20卷 1919-1929页

作者： Alain Frigon Charly g.Lecomte Department of Pharmacology-Physiology Faculty of Medicine and Health SciencesUniversitéde SherbrookeCentre de recherche du Centre Hospitalier Universitaire de SherbrookeSherbrookeQCCanada

Every day walking consists of frequent voluntary modifications in the gait pattern to negotiate *** spinal cord injury,stepping over an obstacle becomes *** over an obstacle requires sensorimotor transformations in several structures of the brain,including the parietal cortex,premotor cortex,and motor *** information and planning are transformed into motor commands,which are sent from the motor cortex to spinal neuronal circuits to alter limb trajectory,coordinate the limbs,and maintain *** spinal cord injury,bidirectional communication between the brain and spinal cord is disrupted and animals,including humans,fail to voluntarily modify limb trajectory to step over an ***,in this review,we discuss the neuromechanical control of stepping over an obstacle,why it fails after spinal cord injury,and how it recovers to a certain extent.

关键词： biomechanics locomotion neurophysiology obstacle negotiation spinal cord injury