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energy-absorbing     
相关语句
  吸能
     As to vehicle parts' crashworthiness, the paper conducts simulation study of designing energy-absorbing steering system and adaptive airbag system.
     在关于车辆部件的碰撞安全性能设计中进行了吸能转向机构和自适应安全气囊的仿真研究,提出了吸能转向机构和自适应安全气囊的仿真研究方法;
短句来源
     The Axial Energy-Absorbing Characteristics Research of the Thin Wall Structure of Aluminum Alloy with Different Section Shape
     不同截面形状铝合金薄壁结构的轴向吸能特性研究
短句来源
     Energy-absorbing capability of structural elements is studied through experiment and simulation. Then,on the basis of element's research fruit,analysis modeling of structure is established,and numerical simulation of structure's crashworthiness could be performed. The method has found application in project practice.
     提出了基于元件的复合材料结构耐撞性分析方法 ,首先将结构细分成多种元件 ,通过试验和数值模拟研究元件的缓冲吸能性能 ,然后在元件研究的基础上建立复合材料结构的分析模型 ,该方法可以有效分析复合材料结构的耐撞性能 ,并已在工程实践中得到应用 .
短句来源
     Study of Energy-absorbing Property for Foamed Molybdenum
     泡沫钼材料的吸能特性研究
短句来源
     The results show that the specific energy-absorbing of aluminum alloy thin wall pipe is 2-3 times of that of the low carbon pipe with have the same section shape;
     结果表明,铝合金薄壁管的比吸能是同类截面形式的低碳钢管的2~3倍;
短句来源
更多       
  能量吸收
     NUMERICAL SIMULATION STUDY ON THE INERTIA-SENSITIVENESS OF ENERGY-ABSORBING STRUCTURES UNDER IMPACT LOADING
     动态冲击下能量吸收结构的惯性敏感性的数值模拟分析
短句来源
     Firstly, based on non-liner FEA, the crash simulation of energy-absorbing device in urban rail vehicle was studied by using MSC software.
     论文首先介绍了耐撞击车辆上的高能量吸收元件,基于非线性有限元技术,运用MSC. PATRAN软件对拟使用于城市轨道车辆上的破裂型吸能防爬器建立了非线性有限元模型,运用MSC.
短句来源
     A 2D non-liner finite element model was built up and an analysis was carried out based on studying its dynamic response and energy absorption, as well as the tearing process of this energy-absorbing device.
     DYTRAN软件进行了碰撞仿真分析,得到了其在高速冲击下的动态响应和能量吸收情况,并较真实地模拟了吸能元件在高速冲击下的破坏撕裂过程。
短句来源
     Moreover, the energy-absorbing characteristics of the guardrail system in the impact process are analyzed. It is found that the impact energy of the loading head mainly translates into the internal energy at each part of the guardrail system and the residual kinetic energy at the loading head, and that the blocks and the W-beams are the main parts absorbing energy.
     分析了撞击过程中护栏系统的能量吸收特性,发现加载头的冲击能量主要转化为护栏系统各部分的内能和加栽头的剩余动能,吸收能量的主要部件是防阻块和波形梁.
短句来源
  吸能特性
     The Axial Energy-Absorbing Characteristics Research of the Thin Wall Structure of Aluminum Alloy with Different Section Shape
     不同截面形状铝合金薄壁结构的轴向吸能特性研究
短句来源
     Study of Energy-absorbing Property for Foamed Molybdenum
     泡沫钼材料的吸能特性研究
短句来源
     The analysis of energy-absorbing features shows that with the increase in the ratio of diameter to thickness of cylindrical shell,the average collapse load and the energy-absorbing volume for a basic deformation unit increase,so do the effective compression distance and the initial length of a basic deformation unit.
     经吸能特性分析 ,随着圆柱壳径厚比的增加 ,平均压垮载荷和一个基本变形单元能量吸收量增加 ,有效压缩距离和一个基本变形单元的初始长度增加 ,但有效压缩距离与基本变形单元长度之比保持不变 ;
短句来源
     On the basic of test validate, the results will be helpful to the design optimization of the car bumper structure, and energy-absorbing bumper system has good energy-absorption ability.
     经过试验验证,分析结果可以作为轿车保险杠结构设计改进的参考依据,设计改进后的缓冲吸能式保险杠具有较好的吸能特性和耐撞性能。
短句来源
     With two methods, nonlinear FEA simulation and experiment, which are used to study the energy-absorbing elements, the crashworthy performances, such as distortion, crush force and energy absorption of the elements are yielded successfully.
     论文对具有强非线性特征的破裂型吸能结构采用仿真与理论分析相结合的方法进行了吸能特性研究。 研究结果表明:在相同长度及壁厚条件下,两种截面构件有效变形行程相近,而四边形截面结构的吸能效果要优于六边形结构。
短句来源
更多       
  吸能式
     Optimization design of hierarchical energy-absorbing car bumper
     分层吸能式保险杠优化设计
短句来源
     Simulation of Energy-absorbing Steering System in Frontal Impact
     吸能式转向系统在正面碰撞中运动响应模拟
短句来源
     Investigation of Low Speed Collision Test and Simulation for Energy-absorbing Car Bumpers
     缓冲吸能式保险杠的低速碰撞试验和仿真
短句来源
     A hierarchical energy-absorbing car bumper which can be installed in the simple bumper is introduced. With a better energy-absorbing ability and a flat broad energy-absorbing curve,the bumper is an ideal energy-absorbing structure.
     介绍了一种能装于简易型保险杠横梁内部的分层吸能式保险杠,该保险杠具有较高的吸能能力,吸能曲线宽而平坦,是一种较理想的吸能结构。
短句来源
     On the basic of test validate, the results will be helpful to the design optimization of the car bumper structure, and energy-absorbing bumper system has good energy-absorption ability.
     经过试验验证,分析结果可以作为轿车保险杠结构设计改进的参考依据,设计改进后的缓冲吸能式保险杠具有较好的吸能特性和耐撞性能。
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      energy-absorbing
    The addition of a small amount of Mg powder to the Al/NaCl compact can enhance the sintering markedly and increase the energy-absorbing capacity of the foam by up to 50 pct.
          
    Mechanical properties such as compressive strength, energy absorption capacity, and efficiency were investigated to evaluate the feasibility of foams as crash-energy-absorbing components.
          
    The tearing of these ligaments by dimple rupture is the dominant energy-absorbing mechanism.
          
    The steps between adjacent flat facets are more energy-absorbing than in a-brass, providing a possible explanation for the importance of dynamic strain.
          
    A test program was carried out to determine the collapse loads and energy-absorbing capabilities of tubes of different sizes.
          
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    The Polymerization of styrene under γ-irradiation at-78℃ in ethyl bro- mide solution at different concentration was investigated. The rate of polyme- rization increases with the decreasing of styrene concentration; at low conce- ntration level, it passes through a maximum, then falls down rapidly. The molecular weight of the polymer obtained varies slightly at monomer concent- ration above 15 mol. %, but it drops rapidly with the decreasing of monomer concentration. The G value of initiation, calculated from...

    The Polymerization of styrene under γ-irradiation at-78℃ in ethyl bro- mide solution at different concentration was investigated. The rate of polyme- rization increases with the decreasing of styrene concentration; at low conce- ntration level, it passes through a maximum, then falls down rapidly. The molecular weight of the polymer obtained varies slightly at monomer concent- ration above 15 mol. %, but it drops rapidly with the decreasing of monomer concentration. The G value of initiation, calculated from the total energy absorbed by solvent and monomer, does not depend upon the monomer conce- ntration. From the experimental results and preliminary kinetic data, one may consider that the polymerization reaction proceeds by an ionic mechanism. The formed from the ethyl bromide by radiolysis anticipates the initiation directly. In the presence of ethyl bromide, hot electron is mainly captured by the and formed into negative ion; the styryl cation is quite unstable, it does not initiate polymerization directly. When the monomer concentration is sufficient high, termination proceeds through monomer transfer reaction, and monomolecular termination is more favourably at low monomer concentration. Good agreement between the proposed schemes and experimentally determined values was observed. The influence of aditives to the conversion further comfirms that polymerization proceeds by ionic mechanism, the free radical mechanism constitutes only a neglectable portion(<1%).

    研究了苯乙烯在不同浓度溴乙烷溶液中,-78℃γ-射线辐射聚合。聚合 速度随苯乙烯浓度减小而上升,在低浓度区通过最大值然后迅速下降。所得聚 合物分子量在单体浓度15%(克分子)以上变化不大,而低浓度范围内,随单 体浓度降低迅速下降。按溶剂及单体获得的总能量计算引发G值随浓度变化不 大。根据实验结果及动力学初步演算可认为,聚合反应是按离子历程进行的。 溴乙烷辐照生成C离子直接参与引发。当溴乙烷存在下,热电子主要被其 俘获形成负离子,而苯乙烯正离子不稳定,不直接引发聚合反应。在单体浓度 较高时终止反应通过单体转移,在低浓度时,为单分子终止。所获结果与实验 事实较好地符合。 添加物对转化率的影响进一步证明了聚合按离子历程进行.自由基聚合部 分极少(小于1%),可忽略不计。

    The radiolysis of air-free CCl_4 has been well investigated.Using D.P.P.H.Br_2or HI as “scavenger”,the G value of the radicals and the “molecular” products havebeen determined.But the mechanism of radiolysis of CCl_4 in the presence of air isstill not clarified.The main difficulty is that the G value of the back reaction CCl_3+Cl_2→CCl_4+Cl during irradiation has not been determined.It is impossible tocompare the yield of chlorine with G_R value obtained by D.P.P.H method,and tocarry out kinetic calculations.In...

    The radiolysis of air-free CCl_4 has been well investigated.Using D.P.P.H.Br_2or HI as “scavenger”,the G value of the radicals and the “molecular” products havebeen determined.But the mechanism of radiolysis of CCl_4 in the presence of air isstill not clarified.The main difficulty is that the G value of the back reaction CCl_3+Cl_2→CCl_4+Cl during irradiation has not been determined.It is impossible tocompare the yield of chlorine with G_R value obtained by D.P.P.H method,and tocarry out kinetic calculations.In order to eliminate the back reaction we havesuccessfully used tagged triphenyl antimony (~(124) Sb) to remove Cl_2 formed duringirradiation according to the following reaction(C_6H_5) _3Sb+Cl_2→(C_6H_5) _3SbCl_2Thus,not only the G value of Cl_2 and CCl_4 can be determined but the kineticcalculation may also be performed.After the irradiation of the system,the radiolytic products were quantitativelyseparated by chromatography on an Al_2O_3 column.Elution with benzene,gave(C_6H_5) _3Sb (m.p 52℃),elution with ethanol gave (C_6H_5) _3Sb(OH)_2 (m.p 218~219℃,containing Sb 31. 5%),which is formed from the hydrolysis of (C_6H_5) _3SbCl_2(C_6H_5) _3SbCl_2(C_6H_5) _3Sb(OH)_2+2HClG_((C_6H_5) _3SbCl_2) ,value (22. 0) obtained from the chromatographic method,is in agreementwith that (22. 3) obtained from the isotope dilution method.Finally,elution with 0. 01N aqueous NaOH gave a fraction which may be(C_6H_5) _3Sb(C_6H_5) _2SbO_2H or (C_6H_5) _2SbOH.This component will be transferredinto the inorganic phase and the peak in NaOH will disappear in the chromatographyif the irradiated carbon tetrachloride is extracted with 12% HCl.We have determined G_(Cl) of CCl_4 in the presence of air,G_(Cl_2) =5. 3±0. 2.The radiolysis of (C_6H_5) _3Sb-air-CCl_4 systems is an oxygen consuming process(see Fig 1 Chinese text).Therefore,when the concentration effect of (C_6H_5) _3Sb is investigated,the absorbed dose should be controlled under 7. 05×10~(18) eV/ml-CCl_4.From the dependence of G_((C_6H_5) SbCl_2) on the conecntrations of (C_6H_5) _3Sb in thesystem of (C_6H_5) aSb-air-CCl_4 (see Fig.2 Chinese text),it can be shown that:(1)G_((C_6H_5) SbCl_2) increases with the increasing concentration of (C_6H_5) _3Sb and eventuallyapproachs a constant value (G_((C_6H_5) SbCl_2) ≈21. 7) .It means that the back reaction,CCl_3+Cl_2→CCl_4+Cl,is inhibited.G_(-Cl) of the back reaction is obtained by thesubtraction of G_(Cl) from G_((C_6H_5) SbCl_2) ,namelyG_(-Cl_2) =G_((C_6H_5) SbCl_2) -G_(Cl_2) =21. 7-5. 3=16. 4(2) The yield of unknown species in NaOH fraction is about 7 and is veryinsensitive to the variation of (C_6H_5) _3Sb concentration.The unknown species may bethe reaction products of (C_6H_5) _3Sb and Cl~*,thus:ororHence,G value (~7) in NaOH fraction probably represents the yield of Cl~* atoms.By using G value of triphenyl antimony dichloride and suggesting the followingmechanism for the production of chlorineCCl_3+O_2→CCl_3O_2CCl_3O_2→COCl_2+ClOClO+CCl_4→COCl_2+Cl_2+ClCl+Cl→Cl_2G_(CCL_) and G_(Cl+Cl~*) could be evaluated.Assuming G_(CCl_) being approximately equal toG_(Cl+Cl~*),then one molecule CCl_4 will form two Cl_2 molecules under gamma irradiation.Let x be the number of OCl_4 molecules changed per 100 eV of energy absorbed,thenxCCl_4→xCC1_3+xClThere are seven Cl~* atoms and x-7 Cl atoms in the x chlorine atoms.Hence,we havethe following relationsG_(Cl_2) =G_((C_6H_5) _3SbCl_2-0. 6=21. 7-0. 6=21. 1where.0. 6 is the G value of the “molecular” product of chlorineand 2x-7/2=21. 1solving for x,we get namely This value agrees well with the result obtained by D.P.P.H method.We have investigated the radiolysis kinetics of (C_6H_5) _3Sb-CCl_4 in the presenceof air with steady state theory.The following nine main reactions were assumed.2CCl_4(CCl_3) _2+Cl_2 (0)CCl_4CCl_3+Cl(Cl+Cl~*) (1)CCl_3+ClCCl_4 (2)CCl_3+Cl_2CCl_4+Cl (3)CCl_3+O_2COCl_2+ClO (4)ClO+CCl_4COCl_2+Cl_2+Cl (5)Cl~*+CCl_4CCl_3+Cl_2 (6)Cl+ClCl_2 (7)(C_6H_5) _3Sb+Cl_2(C_6H_5) _3SbCl_2 (8)The true reaction For Eq.(4) would be written asCCl_3+O_2→CCl_3O_2→COCl_2+ClOIn order to simplify the oomputation,the following conditions were assumed(1) Because the yields of the cemponent in NaOH fraction was unehanged withthe variation of the concentrations of (C_6H_5) _3Sb (G≈7) ,it was assumed that thiscomponent was the reaction products between Cl~* and (C_6H_5) 3_Sb.Therefore,thereaction (6) was neglected in the following calculations.(2) Considering the consistence between the radical yields obtained by beth D.P.P.H method and (C_6H_5) _3Sb method,we oonoluded that the reaction,CCl_3+O_2→CCl_3O_2 was so fast in the presence of air that the recombination of radicals escapedfrom the track (CCl_3-Cl→CCl_4) can be neglected.(3) The yield of the “molecular” products in the spur reaction,is rather low(G_(Cl_2) =0. 47-0. 80,here taking as 0. 60) .The reaction (2CCl_4→(CCl_3) _2+Cl_2) canbe neglected.So we have wherehere,taking G_(-CCl_4) =12. 3,N_0is Avogadro's number.When steady state has been established.Solving Eqs.(1) to (5) ,we haveThe equation (6) represents the relation between Cl_2 and the concentration of(C_6H_5) _3Sb in the irradiated system at steady state.This equation shows that Cl_2concentration in the irradiated system is deereased gradually while the concentrationof (C_6H_5) _3Sb is increased.It means that (C_6H_5) _3Sb effectively inbibits Cl_2 accumulation.Using equations (5) and (6) we get the desired expressionwhereThe solubility of O_2 in CCl_4 is 2×10~(-3) M at 25℃.As the irradiation container wasleft with a sufficient space for air and a controlled dose was used,the comsumed oxygenwas practically negleoted.The O_2 concentration can be approximately taken as aconstant.where N is the oonversion ooeffioient,and M_((C_6H_5) _3Sb) is the molecular weight of (C_6H_5) _3Sb(the concentration of triphenyl antinomy in equation (7) is expressed by mg/ml CCl_4) .From equation (7) we can obtain the maximum of G_((C_6H_5) _3SbCl) being about 21. 0.The difference between it and the experimental value (21. 7) is 0. 7. This smalldifference may be due to the omission of the “molooular” yield,0. 6,in the deductionof equation (7) .If the “molecular” yield is considered,but the correction of theunknown species in the NaOH fraotion is omitted,then the equation will have thefollowing form whereUsing equation (7) and (10) and setting A′=3. 3 and A′=1. 7 correspondingly,thetheoretical curves of the variation of G_((C_4H_5) _3SbCl_) with the concentrations of (C_6H_5) _3Sbare plotted in Fig.2 (Chinese text) Comparing these with the experimental curve (seeFig.2) ,it can be seen that except those points of which concentration in (C_6H_5) _3Sb isless than 16 mg/ml-CCl_4 the experimental curve is in agreement with the theoreticalcurve within an error of 10%.On the basis of the agreement between the ourves obtained by the kineticcalculation and by experiments,it can be concluded that the above-mentioned ninereactions are main reactions in the radiolysis of the system (C_6H_5) _3Sb-air-CCl_4.

    用三苯基锑作为氯气的吸收剂,研究了~(60) Coγ射线对四氯化碳、三苯基锑-空气-四氯化碳体系的辐射效应.用氧化铝柱层析法分离辐解产物,分别求得■(可能为逆反应 CCl_3+Cl_2-→CCl_4+Cl 消耗的氯的 G 值),并根据■值计算出自由基产额 G_R=24. 6,与 D.P.P.H 法测得的 G_R=25基本一致.当三苯基锑浓度大于每毫升24毫克时,三苯基锑能有效地抑制氯气与 CCl_3基之间的逆反应.由实验求得■和三苯基锑浓度间的关系曲线,并与用稳定态理论导出的理论曲线进行比较,发现两者基本一致.

    Kinetics of the radiolysis of the type 732 polystyrene sulfonic acid resin has been investigated.While comparing radical concentration determined by ESR method with amounts of SO42- obtained after irradiation of the 732-resin, we have found that the resin contains two different structures. One form is so-called normal sulfonic acid resin (i. e. o, p-substituted). The other form is tertiary substituted sulfonic acid resin which was reported as m-substituted earlier. The radiolysis of the dry resins obeys first...

    Kinetics of the radiolysis of the type 732 polystyrene sulfonic acid resin has been investigated.While comparing radical concentration determined by ESR method with amounts of SO42- obtained after irradiation of the 732-resin, we have found that the resin contains two different structures. One form is so-called normal sulfonic acid resin (i. e. o, p-substituted). The other form is tertiary substituted sulfonic acid resin which was reported as m-substituted earlier. The radiolysis of the dry resins obeys first order kinetics, and Kd for dry tertiary substituted sulfonic acid resin equals to 1.24×10-7 rad-1. Its content approximately amounts to 0.2%. The Kd of dry normal resin equals to 4×10-11 rad-1, G = 0. 199.The life time of the radicals of the resin is very long. It can be quenched by water or annealing. In comparison with the original resin, the concentration of radicals of the dry resin which has been pre-irradiated and quenched with water markedly increased under y-radiation.when wet resin was irradiated, the yield of SO42- increased. The kinetic equation of radiolytic hydrolysis has been derived. The Gso42- value calculated with the energy absorbed by water is equal to 8.0±0.2, 1GS042- of unstable resin = 5.3±0.2 and 2Gso42- of stable resin =2.66. Possibly Gso42- is equivalent to GH2o*.

    本文研究了732型苯乙烯磺酸树脂辐射分解动力学,研究结果表明,732型苯乙烯磺酸树脂含有两种不同类型的磺酸树脂。一种为正常的(o,p-)磺酸树脂,另一种为对辐射较敏感的特碳原子磺酸树脂,而非通常文献上认为的m-磺酸树脂。其辐射分解服从一级反应动力学公式。用ESR法测得辐照树脂(经予辐射~10~8拉德处理过)的自由基浓度约为未经处理的4倍。该自由基易为水或加热所猝灭。在γ射线照射下,这两种不同结构的树脂与激发水分子的反应,具有显著差别。导出了辐射水解的动力学公式,并根据树脂中水吸收的能量,计算出受水敏化所致硫酸根的G值。

     
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