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friction     
相关语句
  摩擦
     A Study on the Analysis and Compensation for the Control of Servo Systems with Friction
     含摩擦环节伺服系统的分析及控制补偿研究
短句来源
     STUDY ON NONSMOOTH EQUATIONS METHOD FOR THREE DIMENSIONAL CONTACT PROBLEMS WITH FRICTION
     三维摩擦接触问题的非光滑方程组方法研究
短句来源
     Research on the Theory Methods for the Fast Algorithm in the Boundary Element Method for the Elasticity and Elasto-Plas Ticity Contact with Friction
     弹性及弹塑性摩擦接触边界元快速算法的理论与方法研究
短句来源
     Study on Friction and Wear Property and Lubricant Mechanism of Water Lubricated Bearing
     水润滑轴承的摩擦磨损性能及润滑机理的研究
短句来源
     Research on Characteristics and Control Methods of Dry Friction System
     干摩擦抗振系统性能及控制方法的研究
短句来源
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  摩擦力
     Study on Piezoelectric Inertia Mechanism Driven by Changing Friction Force
     摩擦力变化式压电惯性驱动机构的研究
短句来源
     Problems on Negative Friction of Pile Foundation in Collapsible Loess Region
     湿陷性黄土地基桩的负摩擦力问题
短句来源
     Friction and Frictional Force in Contact Zone of Plastic Deformation
     塑性变形接触区中的摩擦与摩擦力
短句来源
     Friction Vibration (Ⅱ) Relation between Dynamic Friction and Sliding Velocity
     摩擦振动(二) (二)动摩擦力与滑动速度的关系
短句来源
     SIMULATION OF GROUND FRICTION OF FLIGHT SIMULATOR
     飞行模拟机地面摩擦力的模拟
短句来源
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  摩阻
     Study of Friction and Torque in Trenchless Guide Drilling
     非开挖导向钻进摩阻和扭矩研究
短句来源
     Study on Flow Structure and Friction Characteristics of Near Bottom Layer in Estuarine and Coastal Waters
     河口海岸近底层水流结构及摩阻特性研究
短句来源
     Test Study on Properties of Negative Skin Friction of Thin-wall Pipe Pile Using Cast-in-situ Concrete
     现浇混凝土薄壁管桩负摩阻力特性试验研究与分析
短句来源
     The Friction Drag Analysis in Checking the Ability of Resisting Frost Heaving Upswell of Foundation Pile
     基桩抗冻拔验算中有关摩阻力的分析计算
短句来源
     ANALYSIS OF RIGID PIER IN CONSIDERATION OF LATERAL FRICTION FORCE
     刚性基础考虑侧向摩阻力的分析
短句来源
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  摩擦系数
     A Study on the Coefficient of Friction in Rolling
     轧制时摩擦系数的研究
短句来源
     INVESTIGATION ON THE MEAN COEFFICIENT OF FRICTION DURING COMPRESSION ON CYLINDERS OF ALUMINIUM AND COPPER
     平塑压铝和铜圆柱体时平均摩擦系数的研究
短句来源
     The Revision of Euler's Formula and It's Application to the Determination of the Coeffcient of Friction in Friction Winders
     欧拉公式的修正及其在摩擦提升摩擦系数测定上的应用
短句来源
     An Investigation on Testing Method for Apron Friction Coefficient
     胶圈摩擦系数测试方法的探讨
短句来源
     Study of a longtitudinal Friction Coefficient (φ) of Road Surfaces
     路面纵向摩擦系数φ值的研究
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      friction
    Many physical systems such as biochemical processes and machines with friction are of nonlinearly parameterized systems with uncertainties.
          
    Experimental Research on Friction of Vehicle Tire Rubber
          
    A newly developed tire rubber friction test machine is introduced.
          
    Test data of tire rubber friction on concrete and icy road surfaces are obtained and analyzed.
          
    The effect of different road surface, ambient temperature, contact pressure, and slip velocity on friction coefficient is apprehended.
          
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    Hair-line cracks or flakes in steel are known to be associated with the presence of hydrogen. A prevailing theory states that the crack formation is due to disruptive hydrogen pressure being built up in defects in steel. However, little was known regarding to the nature of these defects and the detailed mechanism of the hair-line crack formation. An attempt was made in the present research to investigate this problem by means of internal friction measurements. The preliminary experiments show: (1) The...

    Hair-line cracks or flakes in steel are known to be associated with the presence of hydrogen. A prevailing theory states that the crack formation is due to disruptive hydrogen pressure being built up in defects in steel. However, little was known regarding to the nature of these defects and the detailed mechanism of the hair-line crack formation. An attempt was made in the present research to investigate this problem by means of internal friction measurements. The preliminary experiments show: (1) The presence of hydrogen in certain steels may give rise to the appearance of an internal friction peak when internal friction is plotted against the temperature of measurement; (2) a slight amount of cold-work or soaking at a given temperature has a considerable effect on the optimum temperature of the observed internal friction peak, which indicates that the internal friction peak may be connected with the defects or stress condition in steel; (3) the internal friction peak shows an anomalous amplitude effect, i.e., at a given temperature of measurement an internal friction peak is obtained when the internal friction is plotted against the stress amplitude. Such an anomalous behavior is similar to that previously observed by. one of the authors (Ke) in the case of aluminimum containing 0.5% Cu. It is therefore considered that the internal friction peaks observed may be related to the interaction of hydrogen with the dislocations in steel.

    钢的内部发裂已经公认为与钢中的氢气有关。现有的理论认为这是由于氢气聚集于钢中的内部缺陷产生破裂压力所引起,然而关于缺陷的性质和引起内部发裂的详细机构迄今还没有明确的了解。本文尝试用内耗测量的方法来研究这个问题。初步实验的结果指出: (1)氢在钢中可以引起内耗峰(将内耗表示为测量温度的函数时); (2)轻微冷加工或保温对于内耗峰的颠值温度有着显著的影响,这表示所得的内耗峰与钢中的缺陷和应力状态有关系; (3)所得的内耗峰表现有反常的振幅效应,即在一定的观测温度时,如将内耗表示为外加应力的函数,则也得到一个内耗峰。这与本文作者之一以前在铝铜合金中所观测到的反常内耗峰的性质和表现相同,因而所得的内耗峰可能是由于氢与钢中的原子脱节的交互作用所引起来的。

    It is pointed out in this paper that the following apparent discrepancies exist in Coulomb's Theory: (1) In any problem in mechanics, a force to be definite must have all the three factors involved under consideration. In Coulomb's Theory, however, the point of application of the soil reaction on the plane of sliding is somehow neglected, thus enabling the arbitrary designation of the obliquity of the earth pressure on the wall to be equal to the friction angle between the wall surface and soil. As a matter...

    It is pointed out in this paper that the following apparent discrepancies exist in Coulomb's Theory: (1) In any problem in mechanics, a force to be definite must have all the three factors involved under consideration. In Coulomb's Theory, however, the point of application of the soil reaction on the plane of sliding is somehow neglected, thus enabling the arbitrary designation of the obliquity of the earth pressure on the wall to be equal to the friction angle between the wall surface and soil. As a matter of principle, the point of application should never be slighted while the obliquity of the earth pressure could only have a value that is compatible with the conditions for equilibrium. (2) If the point of application of the soil reaction is taken into account in the problem, the sliding wedge would only tend to slide either on the plane of sliding or on the surface of wall but not on both at the same time, thus frustrating the very conceptidn of sliding wedge upon which Coulomb's Theory is founded. (3) The above discrepancies arise from the fact that the shape of the surface of sliding should be curvilinear in order to make the wedge tend to slide as desired, while Coulomb, however, adopted a plane surface instead. (4) Coulomb, in finding the plane of sliding, made use of the maximum earth pressure on the wall (for active pressure), which refers to the different magnitudes of pressure corresponding to different assumed inclinations of the plane of sliding. But from the relation between the yield of wall and amount of pressure, this maximum value is really the minimum pressure on the wall, which it is the purpose of the theory to find. In engineering books, however, this terminology of maximum pressure has caused considerable confusion, with the result that what is really the minimum pressure is carelessly taken as the maximum design load for the wall. How can a minimum load be used in a design?This paper also attempts to clarify some contended points in Rankine's Theory: (1) It is claimed by Prof. Terzaghi that Rankine's Theory is only a fallacy because of the yield of wall and that of the soil mass on its bed. This charge is unjust as it can be compared with Coulomb's Theory in the same respect. (2) Some books declare that Rankine's Theory is good only for walls with vertical back, but it is proved in this paper that this is not so. (3) It is also generally believed that Rankine's Theory is applicable only to wall surfaces with no friction. This is likewise taken by this paper as unfounded and illustration is given whereby, in this regard, Rankine's Theory is even better than Coulomb's, because it contains no contradiction, as does Coulomb's.

    本文從力學觀點對庫隆理論提出下列問題:(1)在解算力學問題時,每個力有三個因素都該同時考慮,但庫隆對土楔滑動面上土反力的施力點竟置之不理,因而才能對擋土墙上土壓力的傾斜角作一硬性假定,使它等於墙和土間的摩阻角,然而施力點是不能不管的,因而土壓力的傾斜角是不能離開平衡條件而被隨意指定的。(2)如果考慮了土反力的施力點,則土楔祇能在滑動面上,或在墙面上,有滑動的趨勢,而不能同時在兩個面上都有滑動的趨勢,因而庫隆的基本概念“滑動土楔”就站不住了。(3)問題關鍵在滑動面的形狀;如要使土楔在滑動面和墙面上同時有滑動趨勢,則滑動面必須是曲形面,然而庫隆採用了平直形的滑動面。(4)庫隆的土楔滑動面是從墙上最大的土壓力求出的(指主動壓力),這裏所謂“最大”是指適應各個滑動面的各個土壓力而言,但對適應墙在側傾時土壓力應有的變化來說,這個最大土壓力却正是墙上極限壓力的最小值。一般工程書籍,以為這土壓力既名為最大,就拿它來用作設計擋土墙的荷載,荷載如何能用最小的極限值呢?本文對朗金理論中的下列問題作了一些解釋:(1)朗金理論在擋土墙的位移問題上所受的限制,是和庫隆理論一樣的,竇薩基教授曾就此問題認為朗金理論是幻想,似乎是無根據的。...

    本文從力學觀點對庫隆理論提出下列問題:(1)在解算力學問題時,每個力有三個因素都該同時考慮,但庫隆對土楔滑動面上土反力的施力點竟置之不理,因而才能對擋土墙上土壓力的傾斜角作一硬性假定,使它等於墙和土間的摩阻角,然而施力點是不能不管的,因而土壓力的傾斜角是不能離開平衡條件而被隨意指定的。(2)如果考慮了土反力的施力點,則土楔祇能在滑動面上,或在墙面上,有滑動的趨勢,而不能同時在兩個面上都有滑動的趨勢,因而庫隆的基本概念“滑動土楔”就站不住了。(3)問題關鍵在滑動面的形狀;如要使土楔在滑動面和墙面上同時有滑動趨勢,則滑動面必須是曲形面,然而庫隆採用了平直形的滑動面。(4)庫隆的土楔滑動面是從墙上最大的土壓力求出的(指主動壓力),這裏所謂“最大”是指適應各個滑動面的各個土壓力而言,但對適應墙在側傾時土壓力應有的變化來說,這個最大土壓力却正是墙上極限壓力的最小值。一般工程書籍,以為這土壓力既名為最大,就拿它來用作設計擋土墙的荷載,荷載如何能用最小的極限值呢?本文對朗金理論中的下列問題作了一些解釋:(1)朗金理論在擋土墙的位移問題上所受的限制,是和庫隆理論一樣的,竇薩基教授曾就此問題認為朗金理論是幻想,似乎是無根據的。(2)有些工程書中認為朗金理論是專為垂直的墙?

    In a previous paper,(1) a method for solving composite beams jointed by bolts by means of equivalent continous beams is suggested. This result is based on the following assumptions: 1. All beams composing the composite beam have the same deflec non at the point where bolt is used. 2. The actions of bolts are considered as concentrated forces applied on the beams at the points where bolts are used. 8. The effect of torsion caused by the external load which is not ap plied at the shear center of the whole cross-section...

    In a previous paper,(1) a method for solving composite beams jointed by bolts by means of equivalent continous beams is suggested. This result is based on the following assumptions: 1. All beams composing the composite beam have the same deflec non at the point where bolt is used. 2. The actions of bolts are considered as concentrated forces applied on the beams at the points where bolts are used. 8. The effect of torsion caused by the external load which is not ap plied at the shear center of the whole cross-section of the composite beam is neglected. 4. The friction between the beams is neglected. 5. The weakening of the cross sections of the beams due to the bolt holes is neglected. In order to examine the correctness of these assumptions the results of a group of tests are given. The results of tests show that all assumptions except the third are well agree with the practical condition. As to the third assumption, the problem will be further studied.

    作者曾在前文(1)中提供一种应用相当连续樑来解决螺栓连结的组合樑的简便方法。 此结果基于下列诸假设(除弯曲基本假设以外)。 1.组成组合樑之各樑在螺栓处有相同之挠曲。 2.螺栓的作用视为施加在各樑上螺栓处之集中力。 3.由于外加载荷未作用在组合樑整个截面之弯曲中心而引起之扭转影响略去不 计。 4.诸樑间之摩擦力略去不计。 5.诸樑由于螺栓孔而引起之截面削弱略去不计。  为了检查这些假设与实际问题符合之情况,作者进行了一系列实验。 实验结果指出除了第三假设外所有假设均与实际情况很好符合,关于第三假设的问题尚待进一步研究。

     
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