“高密三宝”民间美术色彩研究

高密剪纸、扑灰年画、泥塑在产生与发展的过程中,它们的艺术特色随着不断的发展变化形成各自的艺术特点。     

SolidWorks在扑翼微型飞行器设计制造中的应用

扑翼微型飞行器是一种模仿鸟类或昆虫飞行的新概念飞行器。介绍SolidWorks设计软件在驱动机构运动仿真、翅翼频率分析和参数化设计中的应用。结果表明,SolidWorks应用于扑翼微型飞行器设计制造可以简化设计流程,提高设计效率。     

仿生扑翼机构设计及仿真分析

提出一种新型仿生扑翼机构,用于模仿鹰翅翼的运动。通过UG实体建模和运动学仿真验证了该机构的可行性。通过ADAMS建立扑翼机构的虚拟样机,并进行了动力学仿真分析和优化设计,得到满足设计目标的最佳扑翼机构,分析结果为扑翼机构的实物快速制作及扑翼飞行器的研制提供参考。     

部分柔顺翅翼机构及其动力学分析

提出将包含"固定-铰接"的柔顺片段的部分柔顺机构作为微扑翼飞行器的翅翼机构。在简要介绍刚性、含弹簧和部分柔顺三种翅翼机构的结构和特点之后,利用伪刚体法对部分柔顺翅翼机构进行了动态静力分析,并将结果与相同条件下刚性及含弹簧的翅翼机构进行了比较。研究表明部分柔顺和含弹簧的翅翼机构都能明显地减小刚性翅翼机构的运动副反力和平衡力矩的峰值,而在一周期内部分柔顺翅翼机构运动副反力和平衡力矩的平均值比含弹簧翅翼机构的平均值的要小。通过验证,这些结论在不同的曲柄转速下是相同的。     

路由抖动的研究

路由抖动是Internet不稳定的主要因素,频繁的路由抖动不仅加重了路由器的CPU处理负担,增加了网络的带宽消耗,严重情况下还会导致网络的瘫痪。对可以减轻路由抖动对网络的影响的两种方法：路由抑制和路由聚合进行了分析和比较,探讨了路由抑制的实现策略;同时结合开发万林克路由产品中实现BGP的实践,针对市场主流路由器在实现路由聚合和路由抑制时存在的缺陷,提出并实现了一种较为完备的解决方案。     

鸽形扑翼机构设计及翅翼周围流场分析北大核心

为研究扑翼飞行器运动机构扑动原理和翅翼周围流场变化规律,设计鸽形扑翼飞行器扑翼机构并分析翅翼周围流场。运用四杆机构图解法计算出符合扑翼运动要求的曲柄摇杆机构参数,并对相关参数进行优化。基于计算流体力学对扑翼飞行的流场进行数值模拟计算;利用Fluent软件分析得到翅翼周围流场速度云图、湍动能云图以及升力、推力特性曲线。结果表明:鸽形扑翼飞行会引起翅翼流场流动速度发生变化,进而导致空气流动状态由层流变为湍流,湍流动能为扑翼飞行提供气动力。     

Nonsinusoidal motion effects on energy extraction performance of a flapping foil

To seek better energy extraction performance of a flapping hydrofoil, various nonsinusoidal motion profiles are employed instead of conventional sinusoidal flapping motions. The effects of nonsinusoidal motions are investigated for four kinds of nonsinusoidal flapping motions, i.e. varying effective angle of attack profile, nonsinusoidal pitching motion combined with sinusoidal plunging, nonsinusoidal plunging motion combined with sinusoidal pitching, and combined nonsinusoidal pitching and nonsinusoidal plunging motion. An adjustable parameters K is used to realize various nonsinusoidal profile varying from a sawtooth wave to a square wave profile. Numerical results show that by imposing a square-like effective angle of attack profile, extraction power and efficiency can be significantly increased compared with sinusoidal flapping motion. By accelerating the formation time and development of leading edge vortex (LEV), the square-like effective angle of attack profile leads to a better synchronization between the vertical force and plunging velocity. Similar effect on the flapping foil energy extraction performance is also found by imposing nonsinusoidal pitching profile. While the output power enhancement is quite limited by using the nonsinusoidal plunging profile. Moreover, the energy extraction performance can be significantly improved with an appropriate combination of nonsinusoidal pitching and nonsinusoidal plunging motion. Of all the nonsinusoidal motions studied, a toothed-like plunging profile together with square-like pitching profile should be selected for the best energy extraction performance.     

Ability to forecast unsteady aerodynamic forces of flapping airfoils by artificial neural network

The ability of artificial neural networks (ANN) to model the unsteady aerodynamic force coefficients of flapping motion kinematics has been studied. A neural networks model was developed based on multi-layer perception (MLP) networks and the Levenberg–Marquardt optimization algorithm. The flapping kinematics data were divided into two groups for the training and the prediction test of the ANN model. The training phase led to a very satisfactory calibration of the ANN model. The attempt to predict aerodynamic forces both the lift coefficient and drag coefficient showed that the ANN model is able to simulate the unsteady flapping motion kinematics and its corresponding aerodynamic forces. The shape of the simulated force coefficients was found to be similar to that of the numerical results. These encouraging results make it possible to consider interesting and new prospects for the modelling of flapping motion systems, which are highly non-linear systems.     

Simulation of power extraction from tidal currents by flapping foil hydrokinetic turbines in tandem formation

In the present study the power extraction possibility by a number of flapping hydrofoils in tandem formation is investigated. A code is developed to predict power extraction capacity for the various number of flapping hydrofoils based on the kinematic and hydrodynamic models. The selected hydrodynamic model follows two dimensional quasi-steady hydrodynamic instability formulation. It is shown that the power extraction is also possible from water stream with the low Reynolds number. As a result of power extraction at low speed flows, the predicted maximum power efficiency is also in lower flapping frequencies. Furthermore, it is found that there are limited number of required flapping hydrofoils in tandem formation, in which the power influence rate drops notably after the second flapping hydrofoil. The flapping hydrofoils at downstream also experience higher hydrodynamic forces, while the flapping hydrofoil kinematics is the key parameter to harness extracted power. As a result of this investigation, the introduced model and code can be used as one of initial tools to predict power capacity for obtaining vast concept regarding tidal sites with the flapping foil hydrokinetic turbines.