查询词典 aerodynamic force

Then, the impact of aerodynamic side force on stability was discussed.

本章最后推测了超车时气动侧向力对车辆行驶稳定性的影响。

This force is made up of tire,aerodynamic,and gravitational force components.

该作用力由轮胎，空气动力以及重力构成。

As an important component of it,Aerodynamic property is the primary bases of ballistic curve calculation, load calculation,controlling parameter choice, the pushing force of engine choice and material choice,therefore, it is very important to researching the aerodynamic property .

气动特性作为其研究过程中的主要组成部分，它是进行弹道计算、载荷计算和控制参数选择、发动机推力选择、材料选择的原始依据。

In order to create structural optimization model with aeroelastic constraints, dual lattice method is used to evaluate the unsteady aerodynamic force and V-g method is used to estimate the critical flutter speed.

作者采用子结构技术进行了结构的静动力分析，推导出基于"静载模态"概念的子结构响应的灵敏度计算方法，使得子结构响应分析和灵敏度计算在程序上融为一体。

This text proceed with the theory of the vibration, utilize typical elastic hinge law analyze structure dynamics characteristic when the blade is quivered to instability, and then use relevant knowledge of blade vibration to simplify the model and the aerodynamic force of the vibration. Through the simplification, we can get the equation of the blade, which is dispersed to its instability. Then VISUAL BASIC procedure is utilized to work out thecharacteristic value of vibration and the vibration frequency. At last comparing the result which is calculated by the above-mentioned theory formulae with the result which is calculated by internationally agreed procedure ANSYS to verify the accuracy of the formula of reduction.

本文从振动理论入手，利用最为典型的弹性铰链法分析叶片发生颤振失稳时的结构动力学特性，然后对振动模型及振动时所受的气动力进行简化，利用简化方程得到叶片发生发散失稳时的振动方程，利用编制的VISUAL BASIC程序解出振动的特征值并得到振动频率，最后分别通过上述的理论公式和国际通用的有限元程序ANSYS对风力机叶片模型进行发散失稳时的频率计算，验证简化公式的准确性。

In order to improve the running stability of passenger train in strong crosswind ,its running condition on embankment while suffering from strong crosswind was simulated by using 3-D unsteady N-S equations and dynamic mesh technique,the relationships between aerodynamic force and train speed,crosswind speed and embankment tallness,and simulation result was compared with tunnel test result.

为了提高强横风作用下客运列车运行的稳定性，基于三维非定常方程，采用动网格技术，对强横风作用下的青藏线客运列车在路堤上运行情况进行了模拟，分析车速、风速及路堤高度与气动力之间的关系，并将计算结果与风洞实验结果进行对比。

At the same time, the self—exciting force with indicial function formulae put forward by R. H. Scanlan is extended to the three— dimension analysis and separated into the quasi—steady part and the part related to the past history of the structure. The former is interpreted by the aerodynamic damping and aerodynamic stiffness, the later, by the load. Then, the self—exciting force related to the structure motions can be easily introduced.

然后，将Scanlan提出的自激力的阶跃函数表达方法推广运用于三维分析，并将自激力分为似定常部分和与过去响应历程有关的部分，进而分别用气动阻尼、气动刚度和外荷载的形式来描述，从而实现了引入与结构运动相关的自激力。

It is concluded that all of the tested bionic wings can generate lift force, however the flexible wing has best kinetic and aerodynamic performance among them, as well as flapping frequency and amplitude are the main factor of effecting on lift force generation.

实验结果表明，研制的翅型都能产生一定的升力，其中柔性翅具有较好的运动性能和气动性能，并且拍动频率和拍动幅度对升力有较大影响。

In addition, it's computed that how the aerodynamic force of flexible flapping-wing changes with flap parameters, such as flap angle, flap frequency, and so on. The computed results explained why bird wing have different flap motions in different phases of flight, and provide theory for future design work of flapping-wing MAV.

此外，本文还模拟计算了时柔性扑翼气动力随扑动角、扑动倾角等参数变化的情况，从而从气动的角度解释了飞鸟在不同飞行阶段的扑翼规律，并为柔性扑翼飞行器的设计提供了理论依据。

The theoretical and experimental investigations of discus flight indicate the following useful conclusions:the optimum combination of throw angle and discus inclination angle is 35°/26°at zero wind,while 45°is not the best release angle due to the aerodynamic force;different combinations of throw angle and inclination angl...

由于气动力的作用，45°并非铁饼的最佳投掷角度，实验和理论研究表明：无风时35°/26°的投掷角/倾角组合最佳；顺风和逆风投掷必须采用不同的投掷角/倾角组合才能获得当地条件下的最好成绩；铁饼出手时25r/s的自转速度已经可以满足稳定性的要求。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。