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动升力
相关语句
  hydrodynamic lift
     Mathematical model on longitudinal motion of high speed craft in heading sea considering effect of hydrodynamic lift
     一种能考虑动升力影响的高速艇迎浪纵向运动的数学模型
短句来源
     Hydrodynamic Lift of Craft With Two Wedges
     双折板艇的流体动升力
短句来源
     In this paper, the hydrodynamic lift calculation by means of high-liftarea method, which has a remarkable effect on the transitional stage of fast craft, is discussed and the relations of hydrodynamic lift with trim, wetted area and resistance are attemped to find out.
     本文探讨对过渡阶段快艇效果较显著的高升力面法的流体动升力计算,并试图寻求流体动升力与纵倾、湿面积、阻力的关系。
短句来源
  相似匹配句对
     Hydrodynamic Lift of Craft With Two Wedges
     双折板艇的流体升力
短句来源
     The Research for Lift-feedback Fin Stabilizer System and the Alteration of Its Servo System
     升力反馈减摇鳍系统的研究及随系统的改造
短句来源
     Analysis on dynamic filtration
     失水分析
短句来源
     DYNAMIC LOADING OF DRIVING TRAIN ON BRIDGES
     列车
短句来源
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  hydrodynamic lift
In contrast hydrodynamic lift is considered more important in smaller white sharks.
      
It is now known that this is not generally the case, in part because the distribution of particles in the annulus is influenced by hydrodynamic lift, which is discussed in the paper.
      
The wave effects on the hull maneuvring coefficients were estimated, together with the hydrodynamic lift due to wave fluid velocity, and the change in added mass due to relative wave elevations.
      
The otpimization problem consists in finding the shape of the hydrofoil having minimal drag, while satisfying certain constraints on the volume and hydrodynamic lift.
      
During water lubrication, quasicrystals act similar to ceramics where surface smoothing and hydrodynamic lift control the friction and wear properties.
      
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  dynamic lift
A significant increase in the dynamic lift force and nose-down pitching moment was observed.
      
The qualitative changes of dynamic lift and friction forces caused by small-amplitude harmonic vibrations superimposed on flows in a plane slider bearing are considered for simple viscous and viscoelastic lubricating fluids.
      
The flow around the sphere is asymmetrical thus producing a dynamic lift during the motion.
      
As a result, predominant spectrum peak, the Strouhal number of which is about 0.24, is found in the power spectral density of dynamic lift force on the arm.
      
The flow visualization confirmed that the dynamic lift with the spectral peak originates from the alternating vortex shedding from the trailing edge of the arm.
      
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  dynamic forces
As a result, the dynamic forces ρ[(v ?)v]θ, which are equal in magnitude to the pressure gradient ?θP on the sonic surface, become significant in vertical balance.
      
Effective dynamic forces and heat transfer coefficients were measured for several tube bank configurations, and it was found that the average forces are smaller than for a single tube.
      
The results provide useful guidelines for optimizing the configuration of tube banks to achieve high heat transfer coefficients while reducing tube erosion due to dynamic forces.
      
Responding to such need, a needle force measurement device that is capable of measuring dynamic forces experienced by medical needles during needle penetration through protective articles was developed and described in part I.
      
Calculations are carried out of the dynamic forces and viscous heating when a layer of Newtonian liquid at the bottom of a rigid container is extruded through a matrix in the form of a circular opening or a narrow slit.
      
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In this paper, the hydrodynamic lift calculation by means of high-liftarea method, which has a remarkable effect on the transitional stage of fast craft, is discussed and the relations of hydrodynamic lift with trim, wetted area and resistance are attemped to find out. Non-dimensional exponential expressions and nondimensional isograms of varing rate of elements are preliminarily obtained. Satisfactory results were obtained from model test and craft sea trial.

本文探讨对过渡阶段快艇效果较显著的高升力面法的流体动升力计算,并试图寻求流体动升力与纵倾、湿面积、阻力的关系。初步求得指数关系的无因次表达法和诸元变化率的无因次等值线图表。船模试验和实艇试验均得到满意的结果。

A new analytical model is developed to analyze rotor dynamic loads. A dynamic inflow model, verified by the experiment of rotor static loads, is included to take unsteady inflow into account. In this analytical model, separation of variables is used to analyze structural response. The flapping displacement of the blade is determined by the flapping generalized displacement and normalized mode shape. Blade bending moment is calculated by force integration method. On the basis of the comprehensive dynamic calibration...

A new analytical model is developed to analyze rotor dynamic loads. A dynamic inflow model, verified by the experiment of rotor static loads, is included to take unsteady inflow into account. In this analytical model, separation of variables is used to analyze structural response. The flapping displacement of the blade is determined by the flapping generalized displacement and normalized mode shape. Blade bending moment is calculated by force integration method. On the basis of the comprehensive dynamic calibration of a test system, rotor model test stand/rotor balance, rotor dynamic thrust due to collective pitch oscillation is experimentally investigated in hover. During the sine oscillation of collective pitch, signals from the rotor balance are acquired. The dynamic thrust is obtained from the analysis of both the signals and the frequency response function of the test system. Correlation between the prediction of analytical model and the test data is good. From the comparison of calculation with dynamic inflow and quasi steady model, it is discovered that the influence of dynamic inflow on both magnitude and phase of dynamic thrust is significant in low oscillation frequency and low collective pitch.

建立了计入动力入流的旋翼动载荷分析模型,在旋翼模型试验台上进行了悬停状态总距激振的铰接式旋翼动态升力实验研究,理论计算与试验吻合很好。分析表明,激振频率越小,动力入流对悬停状态旋翼动升力影响越大;静态总距越小,动力入流的影响也越大。

According to the characteristics of motion of high speed craft in still water and waves, the fundamental hypotheses of longitudinal motion of the high speed craft in heading sea are presented; the longitudinal motion equation of the planning craft in heading sea is established, which includes the effects of the hydrodynamic lift and the hydrodynamic moment of the planning craft; a new theoretical method on longitudinal motion of the high speed craft in waves, i.e. planning method, is presented; and the theoretical...

According to the characteristics of motion of high speed craft in still water and waves, the fundamental hypotheses of longitudinal motion of the high speed craft in heading sea are presented; the longitudinal motion equation of the planning craft in heading sea is established, which includes the effects of the hydrodynamic lift and the hydrodynamic moment of the planning craft; a new theoretical method on longitudinal motion of the high speed craft in waves, i.e. planning method, is presented; and the theoretical prediction program is set up. The model experiments in waves are carried out. The calculated values of heave, pitch in different speeds, are compared with experimental values. The result shows that the planning method is suitable for the prediction of longitudinal motion of high speed craft in heading sea at the middle or high speed.

根据高速艇在静水及波浪中运动的特点,提出了高速艇迎浪纵向运动的基本假设,建立了能考虑动升力影响的高速艇迎浪纵向运动基本方程,并提出了高速艇迎浪纵向运动预报的一种新方法(滑航法),编制了理论预报程序,进行了模型试验验证研究.结果表明,中高航速时,滑航法可用于高速艇迎浪纵向运动的预报.

 
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