查询词典 force-feeding

In this paper the sands＇ physics-mechanics properties were measured with the sample of northwest desert in our country, taking WTC5380TSM desert vehicle as the object studied the desert trafficability, presented the formulas of tangential tractive force and motion resistance, taking the pothook tractive force and the coefficient of traction as the evaluating indicator of trafficability.

淮阴工学院，江苏淮安223301摘要：以我国西北部沙漠为样地测定了沙土的物理一力学性质，以WTC5380TSM沙漠车为对象进行了沙漠通过性的研究，给出了切线牵引力和行驶阻力的计算公式，以挂钩牵引力和牵引性系数作为通过性的评价指标。研究表明，WTC5380TSM沙漠车在该沙漠中有较好的通过性能，能够满足交通运输作业的要求。

A unit of work equal to the work done by a force of one poundal acting through a distance of one foot in the direction of the force.

尺磅达功的单位，相当于一磅达的力沿力的方向经过一英尺距离所做的功

In response to the relationship between cavitations and wake gradient, this paper puts forward 3 kinds of calculating model of propeller exciting force , then puts the actual exciting force into pattern formula, and then obtains a new formula to predict propeller-induced hull surface pressure fluctuations by analyzing and calculating some actual ships.

在深入研究国内外螺旋桨激振力计算方法以及综合分析影响螺旋桨激振力的各种要素的基础上，根据空泡数和伴流梯度的关系，本文提出三种螺旋桨脉动压力的计算模型，将反推得到的实际激振力分别代入模型公式，应用数学统计方法对几条实船进行计算分析，得到用于预报螺旋桨表面力的新公式。

There are two focus included as the following two topics:The measurement of equilibrium charge of dust particles in the plasmas By studying the forces acting on dust particles at the equilibrium position, where, the electric force and gravity force are importantly considered, the equilibrium charge of dust particles can be presumedly calculated according to the relation of the forces.

文中着重进行了以下两个方面的研究：一、等离子体中尘埃粒子平衡电荷量的测量通过研究尘埃粒子在平衡位置处的受力情况确定尘埃颗粒所带的电荷量。主要考虑两种力的作用即尘埃粒子所受的电场力和重力。根据这两种力的平衡关系就可以粗略得出尘埃粒子在平衡位置处的电荷量。

In this topic, the dynamic analysis methods for piezoelectric vibrator are studied systematically based on the theoretical model, FEM numerical experimentation and FEM governing equation for given compound-mode vibrator, and some valuable conclusions are obtained. The main work accomplished is summarized as follows: 1.Elaborate the main modeling methods for piezoelectric vibrator and the significance and necessity to study the dynamic characteristics of piezoelectric vibrator which emphasize the urgency of this paper. 2.Take the bending deformation induced by piezoelectric ceramic as example, the energy transfer mechanism of electric energy to mechanical energy are analyzed; the motion and force transfer mechanism are analyzed for the longitudinal-bending vibrator. 3.Based on mode assumption and Hamilton principle, the coupling model of piezoelectric vibrator of linear USM is built; moreover, the equivalent circuit model is obtained and a coupling equation represents the relation between electric parameters and mechanical parameters is derived which provides foundation to match the vibrator and driving circuit. 4.Combine the constitutive equation of piezoelectric ceramic with elastic-dynamical equation, geometric equation in force field and the Maxwell equation in electric field and the corresponding boundary condition equation, the FEM control equation for piezoelectric vibrator of USM to solve dynamic electro-mechanical coupling field is established by employing the principle of virtual displacement. The equation lays the foundation to study the non-linear constitutive equation of piezoelectric ceramic driven by high-power. 5.Define the dynamic indexes of characteristic of vibrator and carry out variable parameters simulation by calculating the model parameters and the electric characteristics of vibrator are simulated according to the equivalent circuit model. By numerical experimentation, the working mode of vibration of vibrator and the shock excitation results of the working frequency band which provides the mode frequency to realize bimodal are analyzed. Detailed calculation of the electro-mechanical coupling field parameters is made by programming the FEM control equation.

本课题从理论模型、有限元数值试验、有限元控制模型等方面以复合振动模式振子为例对超声电机压电振子的动力学特性及其分析方法进行了全面系统地研究，得出了许多有价值的结论，主要概括如下： 1、阐述了目前针对超声电机压电振子的主要建模方法，对压电振子动态特性的研究意义和必要性进行了论述，突出了本文研究内容的迫切性； 2、以压电陶瓷诱发弹性体发生弯曲变形为例，分析了压电陶瓷通过诱发应变来实现机电能量转换的机理；对基于纵弯模式的压电振子的运动及动力传递机理进行了分析； 3、基于模态假定，利用分析动力学的Hamilton原理，建立了面向直线超声电机压电振子的机电耦合动力学模型，并据此建立了压电振子的等效电路模型，导出了电参量与动力学特性参量的耦合方程，为压电振子与驱动电路的匹配提供了依据； 4、从压电陶瓷的本构方程出发，综合力场的弹性动力学方程、几何方程、电场的麦克斯韦方程以及相应的边界条件方程，采用虚位移原理，建立了压电振子动态问题机电耦合场求解的有限元控制方程，为研究其大功率驱动下的非线性本构模型奠定了基础； 5、界定压电振子的动力学特性指标，对压电振子的机电耦合动力学模型参数进行计算及变参数仿真；依据等效电路模型，对压电振子的电学特性进行了仿真分析；通过有限元数值实验，对压电振子工作模态附近的模态振型及工作频率附近的频段进行了激振效果分析，找出了实现模态简并的激振频率；利用有限元控制方程，通过编程计算，对压电振子的力电耦合场参数进行了详细计算，得出了一些有价值的结论。

Based on the concept of the non-proportional damping which may be divided into the proportional part for dissipation of energy and the nonproportional part for transformation of energy, a new modal superposition pseudo-force method is presented if the approximate decoupling method is not suitable. In this method the coupled modal equations are solved by iteration in which the coupling terms are treated as pseudo-force and set to the right side of the equations.

在不能进行近似解耦分析时，基于非比例阻尼可分为耗散能量的比例部分和转换能量的非比例部分这种概念，建立了一种拟力实模态叠加法，即把正则化的耦合模态方程中代表非比例阻尼部分的耦合项作为虚力，放到方程的右端，再运用迭代法求解。

Estimate the force constant k of a Z-H bond, assuming that there is a linear proportionality between force constant and bond enthalpy.

键的键合常数，焓的线性比例关系。从这些信息中推测 Z 的原子量。并给出 Z 的元素符号。

Firstly, this dissertation carries out bionic research on the motion of fish body and caudal fin of Thunmiform swimmers in one-dimensional steady swimming for the purpose of establishing kinematic model of underwater propulsor of Thunmiform. This paper also presents the kinematic parameters which describe the motion of fish body and caudal fin, the fundamental approach to getting the propulsion force and the factors related to the propulsion force and efficiency.

首先，从建立仿鲹科加新月形尾鳍推进模式水下推进器运动学模型的目的出发，对采用鲹科加新月形尾鳍推进模式的鱼类在一维稳态游动情况下的身体以及尾鳍的运动进行了仿生学研究，研究了推进运动的基本特征，给出了身体及尾鳍的运动状态、描述其运动的运动学参数、推进力产生的基本途径以及与推进力和推进效率有关的因素，从而为仿鱼水下推进器运动学建模与仿真提供了仿生学基础。

The article thinks, still put in labour force to become the economic condition of commodity below condition of socialist market economy, consequently labour force is commodity.

本文认为，在社会主义市场经济条件下仍然存在劳动力成为商品的经济条件，因而劳动力是商品。

Throughout its history, then, Chinese art conceives nature as animated by an immanent force, and the object of the artists is to put themselves in communion with this force, and then to convey its quality to the spectator.

有史以来，中国艺术便是凭借一种内在的力量来表现有生命的自然，艺术家的目的在于使自己同这种力量融会贯通，然后再将其特征传达给观众。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。