In the second chapter, elementary theories and ideas of one step forming inverse approach were described and warped modification method, implemented by Cook, was introduced into one step forming simulation and based on idea of surface spreading; new quadrilateral element modification arithmetic was put forward. By spreading warped quadrilateral onto plane in local coordinate system, a plane quadrilateral element whose shape and area were equal to original warped quadrilateral element was gotten and internal force vectors of four nodes and stiffness matrix of elements were improved to increase precision of simulations on this plane element.

第二章從一步成形逆有限元法的基本理論和思想出發(fā)，將Cook基于彈性理論的四邊形單元的翹曲修正算法引入基于塑性的一步成形日韩美女福利网址在线播放免费观看，并且基于曲面展開的思想欧美老妇淫乱视频，本文提出一種新的四節(jié)點(diǎn)單元翹曲修正方案，通過把翹曲的單元展開的方法在局部參考系中得到一個(gè)與實(shí)際翹曲單元的形狀與面積非常接近的平面單元欧美日韩在线一区二区，在該平面單元中進(jìn)行單元?jiǎng)偠燃皟?nèi)力向量的計(jì)算99在线视频播放乱爱妇乱子伦精品视频，進(jìn)一步改善模擬結(jié)果的精度。

In terms of the transmission shaft balancing, it exists another problem that the shaft is not looked at as rigid body.When the rotor running at a high-speed ,under the action of unbalance force ,the transmission shaft will bend. It is certainly ideal to balance a transmission shaft as a flexible rotor.However, considering the mass production of automobiles, this method is obviously unpractical. In order to discreasing the flexible deformation, in this theory, the feasibility that double- plane balancing takes method the place of multi-plane balancing on a special place for one segment transmission shaft.

從傳動(dòng)軸平衡的角度來看色色色资源网站，傳動(dòng)軸并非剛體东京热视频网址，在汽車高速旋轉(zhuǎn)時(shí)，由于不平衡力的作用會(huì)使傳動(dòng)軸發(fā)生撓曲女人特黄特色视频在线观看，如果將傳動(dòng)軸作為撓性轉(zhuǎn)子進(jìn)行平衡當(dāng)然比較理想久久99日，但是不符合汽車大批量生產(chǎn)的實(shí)際，為減少撓曲振動(dòng)，利用撓性轉(zhuǎn)子平衡原理久久久九九有精品国产，對(duì)于單根傳動(dòng)軸欧美性愛視頻播放，從特殊位置進(jìn)行校正，從而以二面平衡代替多面平衡是可行的官网免费A片。

The balancing condition of plane joint-force system is that force polygon must be closed.The graphic solution and AUTO CAD tool of computer can be applied to obtain two forces on a nodepoint fast and accurately,then internal force of truss can be obtained.

摘 要 一個(gè)平面匯交力系的平衡條件是其力多邊形必須閉合中中文字幕第一页，依其條件，利用圖解法和計(jì)算機(jī)中的AUTO CAD繪圖工具91精品国产福利下线，迅速準(zhǔn)確地求解一個(gè)結(jié)點(diǎn)上的兩個(gè)未知力播放一级毛片免费，并以其類推求解桁架各桿內(nèi)力。

Applying combined method of quantitative analysis and qualitative analysis, on the basis of on ago research fruit, this paper firstly analyses main factors that affect the safe distance from friendly force to target for tank gun overhead firing systemically. Based on that, this paper builds math model of calculating the safe distance from friendly force to target separately aiming to the difference of tank gun overhead firing in plane and undulate terrain. At last, through applying Mathematica soft, this paper presents the safe distance from friendly force to target for a tank gun overhead firing used APFSDS, HEAT and HESH, combined qualitative analysis.

采用定量分析和定性分析相結(jié)合的方法玖玖在线视频网，在以往研究成果的基礎(chǔ)上九九线精品视频在线观看视频，首先系統(tǒng)地分析并提出了影響坦克炮超越射擊時(shí)友軍至目標(biāo)安全距離的主要因素；以此為基礎(chǔ)18岁以下禁止进入观看黄色网站，針對(duì)平坦地形和起伏地形上坦克炮超越射擊的不同情況18岁污视频在线观看，分別建立了確定友軍至目標(biāo)安全距離的數(shù)學(xué)模型；最后通過運(yùn)用Mathematica軟件進(jìn)行定量計(jì)算五月天色开心，并結(jié)合定性分析亚洲一区二区国产精品一区二区，提出了某型坦克炮使用尾翼穩(wěn)定脫殼穿甲彈人人摸人人操人人干人人、空心裝藥破甲彈和殺傷爆破榴彈進(jìn)行超越射擊時(shí)友軍至目標(biāo)的安全距離。

On the basis of investigating the sound field of a plane piston transducer and the relations between sound field and radiation force, by settling four plane piston transducers driven at the same frequency at each corner of a regular triangular pyramid with their sound-beam axes crossing at the center of the pyramid, this technique uses ultrasonic wave synthetic theory to acquire a three-dimensional ultrasonic standing wave field. The micro-component can be captured, transported, released in the range of space by adjusting the phase of the transducers.

在研究單個(gè)圓形平面活塞換能器聲場分布以及聲場和輻射力關(guān)系的基礎(chǔ)上，將以相同頻率驅(qū)動(dòng)的4個(gè)平面活塞換能器呈正四面體放置自拍av在线，利用聲波合成原理獲得三維超聲駐波場久久AV先锋影音资源网站，通過調(diào)整各個(gè)換能器發(fā)射信號(hào)相位之間的關(guān)系實(shí)現(xiàn)對(duì)微構(gòu)件在空間范圍內(nèi)的俘獲永久免费AV无码动漫网站在线观看、移動(dòng)欧美日韩精品一二、釋放等操縱。

The force of potential sliding body is determined using the FISH program of 3DEC based on Limited Equilibrium Method. And the sliding force and resistance force of potential sliding body are obtained by the resolution of acquired body force along the potential sliding plane. Thus the varied factor of safety of the slope under seismic loads is obtained.

借鑒塊體極限平衡分析思想日本www.XⅩxx，并考慮了地震動(dòng)荷載的全時(shí)程特征久久天堂网av，利用3DEC中FISH語言編程求出了潛在滑體的受力并將其沿潛在滑面分解求得潛在滑體的下滑力和抗滑力，從而求出了地震荷載作用下邊坡的動(dòng)安全系數(shù)歷時(shí)曲線日韩中文视频。

The evolution process under the control of the multigeodynamic force system (including the boundary forces of Eurasia-Pacific-Indian three massive plates around Nansha block, effects of the deep mantle, relative soft layer-sliding planes within Nansha lithosphere block and the earth's rotational inertial force) can be briefly divided four stages: the late Cretaceous to the early Eocene stage of uprilfing-erosion and shear-extension caused by the oceanwards-eastwards withdrew of Pacific subduction zone and the delamination of proto-subducted slab after the stage of pre-Cretaceous pre-rifting active continentoceanic plate margin. In this stage, the Nansha transcrustal layering-block started to move southeastwards on the Nansha transcrustal layer-sliding plane, meanwhile, the Andu-Bisheng and Liyue-Banyue basement layering-block slid on their upper-crust layer-sliding planes, and Xibu accretion zone was formed. Successively, it entered the stage of the mid-Eocene to early Oligocene, when NW-SE sea-floor spreading occurred in the southwest subbasin owing to the slip-line field initiated by the collision between the Indian and Eurasian plates, Zengmu foreland-basin started to develop in the same time. And in the stage of late Oligocene to early Miocene, near NS simple-shear extension and sea-floor spreading in the central subbasin of eastern South China Sea resulted from the south-southeastwards drawing-force of the mantle-flow. The crustal layering-blocks and the Miri accretion zone formed also in this stage.

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The formulation for the contact force between two spheres and the stress and displacement which is caused because of the contact force is also derived. The calculation method of the contact of sphere and plane, sphere and tee is given .At the same time, the formulation for the force distribution of the contact surface is established on the discussion of two arbitary elastomer's contact.

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The basis of static, flat匯交system of forces, torque and couple Department of plane, plane general system of forces, center of gravity and centroid, the internal force and internal force diagram, tension and compression, torsion, bending, stress analysis and strength of the theory of the stability bar , the point of movement, the basic rigid-body movement, points of complex, rigid body planar motion, the movement of particle differential equations, dynamic general theorem, static and dynamic method.

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The results show that space finite analysis results are close to test ones, bottom chords suffer axial force and large in-plane bending, and the max stress is nearby each middle internode. The max stress of node crossbeams occurs in No.2 bottom flange, and that of internode crossbeams happens in ones lying in the middle of every internode. The concrete slab is in tension at the longitudinal direction, and also suffers bent at vertical loads. The degree of completely-composite model taking part in the combined actions is about 55%, while that of semi-composite model is 42%-43%. The combination of concrete slab and bottom chord increases the degree of floor system taking part in the combined actions, lightens the burden of bottom chord, and reduces out-of-plane bending of node crossbeams especially the ones near bridgehead. Stress and displacement of main truss can be evaluated by a equivalent plane rigid frame in preliminary design, and effective stiffness of bottom chords are composed of original ones and concrete slab, and the concentrated load from deck can be translated into uniform load.

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