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Based on the laminate theory, a laminate weakened by damage is treated as an anisotropic thin plate. Using the complex potential method in the plane theory of elasticity of an anisotropic body, the series solution of finite anisotropic thin plate containing an elliptical inclusion is proposed with the help of Faber series. A hybrid element with an elliptical inclusion for anisotropic materials is obtained by using the hybrid variable principle, and the element efficiency is verified by numerical examples. The state of the damage is modeled by an elliptical soft inclusion, and using the point stress criterion based on characteristic curve and Yamada-Sun etc. criteria, the prediction of the strength of a composite laminate with damage is set up. The effects of various parameters on the stress distribution and the residual strength of a composite laminate weakened by damage are detailedly studied.
首先基于经典层板理论,将复合材料层板的弹性问题化归为均匀各向异性板来求解;采用各向异性体平面弹性理论中的复势方法,以Faber级数为工具,给出了有限大含椭圆核各向异性板弹性问题的级数解形式;利用杂交变分原理,成功导出含椭圆核各向异性板杂交应力有限元,并用算例验证了该单元的可行性和有效性;采用含刚度折减椭圆形弹性核的冲击损伤模型,引入基于特征曲线和Yamada-Sun破坏准则的点应力判据,建立了含损伤复合材料层板剩余强度的分析方法;通过数值计算详细讨论了各种几何参数对损伤层板应力分布、剩余强度的影响,得到了一系列对工程应用具有实用价值的结论。
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The main jobs of this paper are as followed: 1 The reuse of the frame design technology for aircraft assembly fixtures is researched. a frame line part library is built with the templet driven technology, the reuse of the frame line part come true by the tools for instantiation and instance modification. The design resources are effectively used, some repeating work is cut. 2 Two methods to obtain the assembly feature are proposed: the straight way by the Enumeration method and the indirect way by project features to the assembly plane. All of the assembly features of the frame and the adjustable bearings are obtained by these two methods which makes the frame automatic assembly technology for aircraft assembly fixtures come true. 3 The frame automatic assembly technology aircraft assembly fixtures based on assembly features is researched. A binary tree assembly model is used to express the assembly information of the frame for aircraft assembly fixtures, the automatic assembly between the frame, the aircraft and the adjustable bearing is completed within the three steps: distribute, obtain and evaluate assembly feature. Finally, the efficiency of the frame assembly design is proved. 4The frame interpart modeling technology for aircraft assembly fixtures is researched, the intersection methods are concluded and the arithmetic of the single-cut, double-cut and inter-cut intersection is proposed, the interpart fast modeling of the frame design for aircraft assembly fixture come true. 5Based on the researches mentioned before, a sub-system of frame fast design for aircraft assembly fixture is developed on CATIA. The sub-system is used to design the aircraft assembly fixtures in a large aeronautics corporation and make a good- effect.
论文的主要工作如下: 1研究了飞机装配型架骨架设计重用技术,在总结归纳骨架线框结构类型的基础上,应用模板驱动的方法建立了骨架线框库,通过骨架线框零件的实例化和离线编辑实现骨架线框的重用,有效利用设计资源,减少重复劳动; 2提出穷举几何对象的装配特征直接获取方法,遍历零件模型的几何对象,从中捕捉所需装配特征,该方法简捷、高效;提出向装配面投影的装配特征间接获取方法,该方法在现有特征基础上生成装配特征,解决了部分装配特征难以直接获取的问题; 3研究了基于装配特征的飞机装配型架骨架自动装配技术,采用一种二叉树装配模型表达骨架的装配关系,并通过装配特征的分配、获取和赋值三个步骤,实现了骨架分别与飞机产品和可调支承的自动装配,避免了繁琐的人工交互操作,提高了骨架设计的效率和规范化程度; 4研究了飞机装配型架骨架零件间建模技术,在总结归纳骨架元件相贯处理方式的基础上,提出了骨架元件单剪切相贯、双剪切相贯和互剪切相贯的实现算法,简化了骨架相贯处理的过程; 5基于以上研究,在CATIA平台上开发了飞机装配型架骨架快速设计子系统,并应用于某大型航空企业的装配型架设计,提高了设计效率和设计质量。
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The Es formation was divided into seven third order sequences based on the seismic, drilling and logging data, and plans deposition system plane distribution maps of different time were plotted by dominance phase principle. The lower Es4 is flood-overlake facies mainly; the upper Es4 is meandering stream and braided river delta deposition above the shore shallow lake background; in the Es3 period, the south mainly developed braided river, meandering stream delta, the northeast area main developed meandering stream delta, the middle area mainly developed semi-deep lakean d deep lake sediments. From lower Es3 to upper Es3, the delta scale gradually increased and the depositional area gradually moved to the east and the southeast; the Es2 period was dominated by shore-shallow lake sediments and widely developed braided river delta and delta deposits; the Es1 period was dominated by shore-shallow lake shoal deposits, and in the south developed meandering stream and braided river delta deposits.The lothological traps of the Shahejie group are mainly fluxoturbidite and stratum lateral pinch-out, and its formation and the distribution of the lothological trap were controlled mainly by the basin structure characteristic, palaeogeomorphology and tectonic activity and so on. It had a beneficial geological condition to develope sublacustrine slump turbidite fans in Jishan, Jiangjiadian and Wawu.
利用地震、钻井、测井等资料,将古近系沙河街组划分出7个三级层序,通过剖面沉积学分析,以优势相原则绘制不同时期各亚段沉积体系平面分布图:沙四下总体以洪水-漫湖沉积为特征,沙四上沉积时期是在滨浅湖背景之上发育了曲流河三角洲和辫状河三角洲沉积;沙三段沉积时期南部主要发育辫状河、曲流河三角洲,西北部地区发育曲流河三角洲,中部地区主要为深湖—半深湖沉积;由沙三下至沙三上,西北部三角洲规模逐渐增大,沉积范围逐渐向东、东南方向推进;沙二段沉积时期为滨浅湖沉积,在背景之上广泛发育了辫状河三角洲和三角洲沉积;沙一段以滨浅湖滩坝沉积为特征,南部发育了曲流河三角洲和辫状河三角洲沉积;沉积地层中的岩性圈闭以滑塌浊积岩岩性圈闭和地层侧向尖灭型岩性圈闭为主,其形成和分布主要受盆地结构、沉积古地貌和构造活动强度等因素控制,北部基山、南部江家店和瓦屋具有发育滑塌浊积扇的良好地质条件。
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One summer they planned to fly to New York for their holidays.They got to the airport only ten minutes before the plane left.So time was short.But suddenly Mrs.Long said she must tell Linda,their daughter,not to forget to lock the front door when she went to school.As Linda was than at school,they coundn't tell her about it by telrphone.So the couple hurried to the post office.Mrs.Long wrote a short note to Linda while Mr.Long bought a stamp and an envelope.Soon the note was ready.They put the stamp on the envelope in a hurry and put it in the letter box.But suddenly Mrs.Long began to try.The short note was still in her hand.She had put the plane ticket in the envelope.
一个夏天他们计划飞往纽约度假,他们在飞机离开前仅十分钟才到了飞机场,所以时间很短,但是突然Long太太说她必须去告诉他们的女儿Linda,当她上学时不要忘记锁自家的前门,现在女儿正在学校,他们不能用电话告诉女儿,所以这对夫妻很快去了邮局,当Long先生买了一枚邮票和一个信封时,Long太太写了一个小纸条给Linda,很快纸条写好了,他们很快把邮票贴在信封上,之后把它扔进信箱里,但是突然Long太太开始哭,那个小纸条还在他的手上,她已经把机票放在了信箱了!
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The transmission mechanism is a plane six-bar mechanism that is made up of two plane four-bar mechanism. Its natural frequencies and mode shapes are obtained by overlapping and synthesizing the mode of each component.
主传动机构是由2个平面四杆机构串联而成的平面六杆机构,通过对各构件的模态进行模态叠加和模态综合,得到传动机构的固有频率和振型。
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By far the most challenging plane to drill was the sail plane.
到目前为止,最具有挑战性的飞机演练船帆的飞机。
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Based on the nonlinear dynamical model of the rotor-bearing system with rub-impact and pedestal looseness, the system periodic motion and its stability were studied in unbalance-rotating speed plane and rotor/stator clearance- rotating speed plane, and the effect of parameters on the system was analyzed and tested by the experiment.
以含有松动和碰摩耦合故障的转子轴承系统为研究对象,对松动碰摩耦合故障转子的周期运动稳定性及其失稳规律进行了研究,得到了系统在不平衡量-转速、碰摩间隙-转速等参数域内的分岔集,分析了这些参数对系统周期运动稳定性的影响,并用试验加以验证。
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Based on the nonlinear dynamical model of the rotor-bearing system with rub-impact fault, the stability of the periodic motion of the system in unbalance-rotating speed plane and rotor/stator clearance- rotating speed plane were studied by the continuation-shooting algorithm. The system periodic motion and its stability were obtained. An experimental setup was developed to investigate nonlinear vibration characteristics of such rotor bearing system.
根据碰摩转子轴承系统的非线性动力学模型,利用延拓打靶算法,在碰摩转子轴承系统不平衡量-转速和碰摩间隙-转速参数域内,研究系统的周期运动及其分岔失稳等动力学行为,得到了系统周期运动的稳定性及失稳规律;建立了研究转子轴承系统碰摩故障的实验装置,通过实验,研究了转子系统碰摩故障的非线性振动的特征。
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On the Astral plane or any outer plane, the astral body is connected at all times to the material body by a silvery cord.
当你在星界或其他外层位面时,你的星界体与实体间会一直被一条银线所连接。
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By the same token, any light reaching the surface of the object will have a reflection, if the plane is a rugged, light scattering in all directions will be lost; if the plane is smooth, then we can certainly see the direction of the reflected light .
而鞋油中有一些小颗粒,擦鞋的时候这些小颗粒正好可以填入皮鞋表面的凹坑中。如果再用布擦一擦,让鞋油涂得更均匀些,就会使皮鞋的表面变得光滑、平整,反射光线的能力也加强了。
- 推荐网络例句
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Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.
最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势,并设计了一款彩色夜视摄像机。
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Only person height weeds and the fierce looks stone idles were there.
只有半人深的荒草和龇牙咧嘴的神像。
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This dramatic range, steeper than the Himalayas, is the upturned rim of the eastern edge of Tibet, a plateau that has risen to 5 km in response to the slow but un stoppable collision of India with Asia that began about 55 million years ago and which continues unabated today.
这一引人注目的地域范围,比喜马拉雅山更加陡峭,是处于西藏东部边缘的朝上翻的边框地带。响应启始于约5500万年前的、缓慢的但却不可阻挡的印度与亚洲地壳板块碰撞,高原已上升至五千米,这种碰撞持续至今,毫无衰退。