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Dynamics of a ring of three coupled relaxation oscillators
Coupled oscillators Nonlinear vibrations Bifurcations Perturbations
2015/8/27
he dynamics of a ring of three identical relaxation oscillators is shown to exhibit a variety of periodic motions, including clockwise and counter-clockwise wave-like modes, and a synchronous mode in ...
Using delay to quench undesirable vibrations
Differential-delay equations Hopf bifurcation Perturbation methods
2015/8/27
A van der Pol type system with delayed feedback is explored by employing the two vari-able expansion perturbation method. The perturbation scheme is based on choosinga criticalvalue for the de-lay cor...
Evolutionary dynamics of a system with periodic coefficients
Replicator equation Parametric excitation Evolutionary dynamics
2015/8/27
We investigate a problem in evolutionary game theory based on replicator equations with periodic coefficients. This approach toevolution combines classical game theory withdiffer-ential equations. The...
A pair of van der Pol oscillators coupled by fractional derivatives
Fractional calculus Fractional derivative Coupled oscillators Perturbation methods
2015/8/27
Weconsiderthestabilityofthein-phaseand out-of-phase modes of a pair of fractionally-coupled van der Pol oscillators:x ?? −? ? 1−x 2 ? x ? +x = ?γ D α (y −x) (1)y ?? −? ? 1ͨ...
On the dynamics of a thin elastica
Elastica Non-local modes DPM Method of direct partition of motion
2015/8/27
We revisit the two degrees of freedom model of the thin elastica presented by Cusumano and Moon(1995) [3]. We observe that for the corresponding experimental system (Cusumano and Moon, 1995[3]), the r...
模糊资源约束的飞机消耗件联合补充研究
消耗件 联合补充问题 模糊资源约束 自适应遗传算法
2016/10/12
针对不确定环境下飞机消耗件联合补充的问题，建立模糊资源约束的消耗件联合补充模型。以最小化费 用为目标，运用模糊数学规划，将模糊约束模型转换为确定约束模型。为提高模型的求解速度和效果，提出综合考 虑种群特征、个体特征和种群进化阶段特征的改进自适应遗传算法，并通过仿真实例，对比分析模糊约束模型和确 定约束模型的结果，以及一般遗传算法和改进自适应遗传算法的性能。结果表明：改进自适应遗传算法能保持种群 多...
Shape Optimization of a Blunt Body Vibro-wind Galloping Oscillator
Vibro-wind Galloping instability Energy harvesting
2015/8/26
The nonlinear dynamics of a transverse galloping blunt body oscillator is analyzed with respect to its geometric shape and size. The oscillator's equation of motion is studied using an approximation f...
Coupled Parametrically Driven Modes in Synchrotron Dynamics
Parametric Coupled Oscillators Mathieu Synchrotron
2015/8/26
This work concerns the dynamics of a type of particle accelerator called a synchrotron, in which particles are made to move in nearly circular orbits of large radius. The stability of the transverse m...
Disappearance of Resonance Tongues
Resonance Parametric excitation Tongue of instability 2:1 subharmonic
2015/8/26
We investigate a phenomenon observed in systems of the form dx/dt = a 1 (t)x+a 2 (t)y,dy/dt = a 3 (t)x+a 4 (t)y,where a i (t) = P i + ε Q i cos2t, where P i ,Q i and ε are given constants,and where it...
Hopf Bifurcations in Two-Strategy Delayed Replicator Dynamics
Replicator Delay Hopf bifurcation Limit cycle Lindstedt
2015/8/26
We investigate the dynamics of two-strategy replicator equations in which the fitness of each strategy is a function of the population frequencies delayed by a time interval T. We analyze two models: ...
为科学评估炮兵精确打击能力，从武器系统性能比较的角度出发，构建评估指标体系，运用模糊聚类分 析方法建立炮兵精确打击作战效能的数学模型，用外军的 4 种常见的精确制导武器作为实例进行评估。结果表明： 该方法所得结果与已存在的文献相符，可为研制新式精确制导武器提供科学的理论依据。
基于双概率相似关系的不完备决策系统数据补齐算法
双概率相似关系 不完备决策系统 决策规则 数据补齐算法
2016/10/12
针对某型导弹故障测试数据的部分缺失问题，提出一种基于双概率相似关系的不完备决策系统数据补齐 算法。在ROUSTIDA 算法的基础上，根据决策属性值将不完备决策系统划分为各个决策子系统，考虑不同决策子系 统中相似对象对决策规则的影响，选择同一决策子系统内最相似的对象来填补条件属性缺失值，并通过实例进行验 证分析。结果表明：该算法在一定程度上能降低计算的复杂性、提高填补率，并能有效解决ROUSTIDA...
基于云理论和组合赋权方法的反潜巡逻机搜潜效能评估技术研究
反潜巡逻机 效能评估 云理论 组合赋权
2016/7/22
针对传统效能评估方法的局限和不足，提出了一种基于云理论和组合赋权方法的反潜巡逻机搜潜效能评估方法；对于因素指标的权重分配问题，将层次分析法和熵权法相结合，依据方差最大化原理提出了一种主客观结合的组合赋权方法；应用云理论进行效能评估，介绍了云的数字特征，引入云权重参与评估，并通过云计算得到最终评估结果。通过实例计算及Matlab仿真，直观明确地体现了各搜潜方案搜潜效能的优劣。
载人航天器在轨维修性设计体系
载人航天器 维修性 设计体系
2017/12/21
开展了对载人航天器维修性设计体系的研究,明确了载人航天器维修性设计体系构成,包括维修性设计、维修性验证、维修性评价和维修性管理。维修性设计包括维修原则确定、维修需求分析、维修任务规划、维修模式设计等;维修性验证包括维修试验规划、分析仿真验证、实物试验验证和在轨飞行验证;维修性评价包括飞行工程师评价和航天员评价;维修性管理将维修性设计、验证、评价工作进行有机衔接并在工程上实施。本文可以作为载人航天器...