x
uploads/elastic deformation.jpg

elastic deformation 【無線電】彈性變形。

elastic side

And then , the error matrixes of location and kinemics of the end point , and the on - line error compensation method are given based on robot ' s dynamics . finally based on puma robot , three simulation examples are given respectively ; the first is about the location error and on - line location error compensation , the second is about the kinetic error and on - line kinetic error compensation , the third is about location and kinetic errors causing by robot ' s dynamics and the on - line error compensations . the simulation results show that : a ) location error of the end point based on elastic deformation of the sensor will be about millimeter ' s degree under the permitting load , b ) the on - line error compensation methods given are available 第三章首先概括了目前機器人連桿慣性參數識別的四種方法,總結這些方法的優、缺點;指出這些方法存在的問題是:或者需將機器人解體,不能在線進行參數識別,或者不能給出機器人連桿獨立的慣性參數值,只能獲得慣性參數的組合值,而這些方法的共同問題是:不能考慮機器人連桿的關節特性;本章提出了一種基于腕力傳感器的機器人末端連桿慣性參數在線識別方法,給出了該方法的理論計算和推導;研究提出了以腕力傳感器輸出為前提的、基于newton - euler動力學的機器人動力學正向、逆向遞推公式;針對機器人負載參數辨識必須在線、實時的特點提出了基于腕力傳感器的負載參數在線識別方法,給出了負載參數識別的步驟。

In order to reduce the losses suffered from collision between passenger trains , a new design method for the car body structure of motor car and trailer is advanced . car body structures are made up of three parts with diffferen tstiffness , by carefully designed . the parts of the front and the end are the wea kstiffness structure to absorb energy through plastic deformation in the collision . the middle part , where only elastic deformation occurs , is an elastic deformati on structure with strong stiffness . as the passenger train runs normally , car body structure measure up to regulation of intensity and stiffness in the standards 為了減輕客運列車碰撞事故造成的損失,實現被動安全保護,對組成列車的動車、客車車體結構提出了新的設計方法,重新分配車體各部分剛度,設計出具有合適吸能結構的耐沖擊車體,車體結構均按前、中、后三種縱向剛度設置,前后兩部分為可以產生塑性變形的弱剛度吸能結構,中間部分為僅產生彈性變形的強剛度彈變結構。

Development of researches on the deformation behavior and mechanism of discontinuous reinforced metal matrix composite was presented , including elastic deformation , micro - plastic deformation , macro - plastic deformation . in fluence factors on the deformation behaviors of the composites were also discussed , and further studies in the field is propected 詳細介紹了非連續增強金屬基復合材料的彈性變形、微塑性變形、宏觀塑性變形行為的研究現狀,論述了復合材料變形行為的影響因素,并指出了進一步研究存在的主要問題。

Based on the numerical simulation and accuracy analysis to previous slab ' s test with the ansys program , the study of composite wall , with various detail design under potential load action respectively or jointly is carried on and the wall ' s atress behavior and failure mode is obtained , also the influence to wall ' s stiffness and bearing capacity by kinds of factors , including wall ' s shear span ratio , member ' s section , bar arrangement , etc . based on the hammer blow test and stiffness test , a 1 / 3 scale ten - bay model ' s modality parameter and elastic deformation characteristic is analyzed 在對密肋復合墻板運用ansys ~ ( ( ? ) )程序進行數值模擬、分析驗證的基礎上,對典型組合墻體在不同連接構造和不同荷載效應組合作用下的受力形態和破壞模式進行研究;計算分析了復合墻體剪跨比、邊框柱截面尺寸、邊框柱配筋大小以及墻板內肋梁肋柱配筋等諸多因素對密肋復合墻體承載力及剛度的影響,得出其變化規律。

At the case of cam - follower system at high speed , the inertia of kinetic components is bound to increase to a leap compared with the system at low speed , the elastic deformation of these components will affect the precision of the driven parts at special position , so the dynamic departure is inevitable 當凸輪機構的運轉速度較高時,系統中運動構件的慣性力劇增,所產生的構件彈性變形的影響將導致工作端運動規律偏離預定的要求,產生不容忽視的動態運動偏差。因此,高速凸輪機構的研究正日益受到廣泛關注。

According to the deformation of the piers on the elastic foundation , which includes the elastic deformations only caused by force and the deformations caused by the rotation and translation of the foundation , the basic oscillation shape function of the piers is put forward , in the same time , the whole seismic vibration equation of continuous beam is derived from the lagrange equation , and the seismic force which involves the integrated parameter y1 , y2 , y3 is calculated with the help of the response spectra method . on the other hand , model indoors is built by the similar theory 本文根據位于彈性地基上的橋墩的變形特點,將橋墩的變形分解為橋墩自身彈性變形、基礎轉動和平動引起的墩身變形三大部分,并以此作為橋墩振型函數,通過拉格朗日方程建立了位于彈性地基基礎上連續梁橋的整體地震振動方程,應用反應譜理論求解包含地基特性綜合參數y _ 1 、 y _ 2 、 y _ 3的地震力。

Abstract : guiding accuracy of casting mould depends on structure and oscillation parameters , such as elastic deformation of guiding leaf - springs , play of bearings between linkages , stroke and frequency of mould oscillation , etc . . in this paper , these factors are studied by means of kinetic and dynamic analysis of oscillating mechanism 文摘:通過對連鑄機結晶器振動機構的運動學和動力學分析,研究了導向板彈簧的彈性變形、連桿軸承間隙等結構參數及振幅、振動頻率等運動參數對結晶器仿弧誤差的影響。

And the theoretical a nalyses done in this paper are listed below : first , the experimental data on the members of varied parameters under torsion demonstrate the general rule of the deformation while the tubular is under torsion . the paper establishes three phases of the deformation of the tubular under torsion , namely , the elastic deformation , the elastic - plastic deformation , and ultimate failure . through regression analysis , a simplified method is proposed for calculating the capabilities of the tubular under elastoplastic torsion , and the formulary for bearing value , is also recommended as a reference in engineering design 本文根據不同參數的構件受扭性能試驗結果,研究了該結構受力變形全過程的基本規律,提出了受鈕全過程的三個工作價段,即彈性變形階段,彈塑性變形階段和極限破壞階段,經分析回歸得到扭轉全過程彈塑性的簡化分析方法及承載力計算公式,可供工程設計參考;同時根據本文的彎扭試驗結果以及對離心鋼管混凝土構件進行的理論分析,推導了彎扭試驗相關承載力的關系。

Abstract : development of researches on the deformation behavior and mechanism of discontinuous reinforced metal matrix composite was presented , including elastic deformation , micro - plastic deformation , macro - plastic deformation . in fluence factors on the deformation behaviors of the composites were also discussed , and further studies in the field is propected 文摘:詳細介紹了非連續增強金屬基復合材料的彈性變形、微塑性變形、宏觀塑性變形行為的研究現狀,論述了復合材料變形行為的影響因素,并指出了進一步研究存在的主要問題。

The establishment of experimental platform and researches on controlled system will provide experimental grounds for the precise realization of any given motion by controlled five - bar mechanism . it also provides basis for adjustment of compensation movement , when further consideration in rod processing errors , elastic deformation and the intervals between kinematics pair 此實驗臺的建立及控制系統的研究為受控五桿機構精確實現給定運動和軌跡提了供實驗依據,也為下一步考慮桿件加工誤差、彈性變形以及運動副之間的間隙時補償運動的調整提供依據。

Numerical viscoelastic modeling for porphyroclast rotation in ductile shear zones is done by a viscoelastic finite element program based on detailed investigation to three ductile shear zones , the taihangshan mountains , north china . in this model porphyroclast garnet is assumed as isotropic elastic material with small elastic deformation , while the matrix quartz , feldspar as viscous fluid maxwell material which has increasing deformation with time . the viscosity of matrix is supposed to be 10 采用粘彈性力學分析程序對太行山阜平地區剪切帶中斑晶旋轉問題進行了有限元數值模擬。在計算模型中假定:石榴石斑晶為彈性材料,在應力作用下只產生很小的彈性變形石英長石質的基質部分為粘彈性材料,它具有隨時間變形不斷增大的特性。

Spray resin soft seal gate valves make use of the compensation effect of the elastic disc , s slender elastic deformation to get a good sealing effect . they have advantages of being turnde on / off easily , sealing dependable , environment protection cffect eviaent and service life long . they are suitable for a wid range of application in on / off and control service and widely used in indutries ranging from running water , sewage treatment , food processing , medicine manufacturing , construction , petroleum , chemical industry , electric power plant , metallurgical industry and light industry 吹塑軟密封閘閥利用彈性閘板產生微量彈性變形的補償作用達到良好的密封效果,該閥具有開關輕巧、密封可靠、環抱性能好及使用壽命長等優點,廣泛應用于自來水、污水、建筑、石油、化工、食品、醫藥、輕紡、電力、冶金等流體管線上作為調節和截流裝置使用。

Whether it or not to improve the lubrication and dynamic performance of gear , at the same time to realize a “ green lubrication “ type of gear transmission of low cost , energy saving and easy maintenance by means of making use of the frication material ' s lubrication performance and meshed medium ' s elastic deformation 能不能研究一種利用摩擦副材料的摩擦潤滑特性和嚙合介質的彈性變形,實現既能改善齒輪的潤滑和動態特性的效果,又能實現低成本、節能、易維護的綠色潤滑齒輪傳動?

Based on an algorithm for solving the time - dependent coefficients nonlinear differential equations numerically , computer software is developed which has an easy - to - use interface . the dynamic response to elastic deformation and stress in key parts and forces acting on the bearings under various parameters and working conditions can be calculated 在研究求解該時變系數非線性微分方程組數值解法的基礎上,開發了具有良好人機界面的仿真軟件,可以計算出多種參數和工況條件下關鍵點的彈性位移、應力和運動副反力的變化規律。

The tower shafts , most of which are hollow and varying in cross section , and altitudinal construction bring trouble to the form work and the stress of strand wire . and the cracks on the crossbeams will be caused by the following - deformation of the bracing structure joints , elastic deformation , uneven settlement and temperature changes . the additional stress of the base slab and the foundation is caused by the deviation of cable bent tower construction 但大跨度橋梁混凝土索塔施工設備進場及現場管理都比較困難;塔柱多為空心變截面,且為高空作業,給模板工程及預應力張拉帶來一定困難;支撐系統連接的間隙變形、彈性變形、不均勻沉降以及環境溫差可導致橫梁裂縫;索塔施工偏位會引起的承臺和基礎的附加應力,對加勁梁的架設影響大;懸吊結構未完體系(架設時)施工階段的風致振動往往影響到施工的安全和質量;實心塔柱部分體積較大,易產生溫度裂縫。

This paper demonstrates ultimate stress increment of unbonded tendons can be composed of approximate elastic deformation along the elements and local plastic deformation by nonlinear analysis on the unbonded partially prestressed concrete continuous structures . referring to the rule of ultimate stress increment of unbonded tendons at every load case , a regression formula of ultimate stress increment of unbonded tendons based on elastic - perfectly plastic model has been presented for engineers to calculate ultimate stresses of unbonded tendons in prestressed concrete multi - span continuous structures 考慮在各種荷載工況作用下無粘結筋極限應力增量的變化規律,并與理想的彈塑性模型相比較,最終得出以理想彈塑性模型計算各種荷載工況作用下無粘結筋極限應力增量的回歸公式,從而為預應力混凝土多跨連續結構的無粘結筋應力設計計算提供有益的參考。

The equations of motion governing the axisymmetric elastic deformation of finite orthotropic cylindrical shells , involving the effect of transverse shear and rotational inertia , are derived . by applying the reverberation method , the displacement and the resultant forces of the shell in the phase space are expressed . then the transient waves in the finite orthotropic cylindrical shell subjected to the axisymmetric impact are obtained by using inverse laplace transforms . furthermore , the transient solutions are decomposed to the generalized ray integrals and computed numerically 分析了計及剪切變形和轉動慣性的有限長正交異性圓柱殼中彈性瞬態波的傳播問題,采用回傳矩陣法,在相空間中給出了位移和內力的表達式。再利用laplace逆變換,得到正交異性圓柱殼受軸對稱沖擊作用時彈性瞬態波解,然后將其分解為若干廣義射線積分之和,并用數值方法求解之。

Depending on how the ground surface is denuded , the feature of the current crustal stress field and rock stress environment can be calculated analyzing the result in this paper : by analyzing the recovering feature of the elastic deformation of the rockmass in unload - stage under various pressures , it has been found there is close relationship between the recovering degree of the elastic deformation of the rockmass and the unloading degree of the pressure the direction of the major principal stress in the crustal stress field is not consistent with the direction of the crushing stress regional tectonics borne during the last tectonic movement . the evolving degree of the regional geomorphology evidently affects the current crustal stress field , which changes from the self - weight stress field to the horizontal stress field , with the changing of the eroding degree of the regional geomorphology ranging from valley area to hilly country to flat country . in valley area , where there is two stress belts , the bankslope s tress belt and the self - weight stress belt within the mountain . the direction of the major principal stress is nearly parallel to the ground surface and inclines towards the valley in the bankslope stress belt . it is nearly vertical in the self - weight stress belt 通過本文的研究成果,根據區域性地貌的演化特征,我們可以大致地對現今地應力場進行判斷:在分級卸荷條件下,巖體中彈性變形的恢復具有明顯的規律性,這種規律對于研究地應力場的演變是有幫助的;地應力場中最大主應力方向與區域構造形跡在最近的構造運動中所受區域性擠壓應力的方向無明顯的對應性;區域性地貌形態的演化程度對現今地應力場的特征具明顯的影響,隨著區域性地貌侵蝕程度由峽谷區、丘陵區、平原區的變化,現今地應力場特征由自重應力場、水平應力場為主含少量自重應力場特征向水平應力場的規律變化;在峽谷區,山體中具有兩個應力帶:自重應力帶和卸荷應力帶,最大主應力方向在卸荷應力帶中近平行于坡面并傾向于河谷、在自重應力帶中近于直立;根據原始地面遭剝蝕的程度,可以大致地估算最大主應力和中間主應力的量值和方向;在丘陵區和平原區,最大主應力的方向近于水平,并與附近區域性侵蝕盆地和河流的展布方向基本平行,根據原始地面遭剝蝕的程度,可以大致估算其最大主應力的量值;根據區域性地貌形態的特征來分析工程區的現今地應力場特征,并進而大致了解巖石的應力環境,這種分析方法得出的結論與許多實際的地應力測試成果基本一致,對于大型水電工程地下廠房和壓力隧洞的設計是有所幫助的。

In chapter 2 , author points out firstly that the elastic deformation of elastic units of a robot ' s wrist force sensor will be enlarged by the end - effector , the instruments and the work pieces , so the elastic deformation of the sensor will influence the location accuracy or kinetic accuracy of end point of a robot , under the condition of that the robot technology facing the developing of heavy load , light mass and high accuracy . it is discussed respectively that the relationship between the differential kinemics in the sensor ' s coordinate and the location accuracy or kinetic accuracy of the end point . error matrixes of location and kinemics of the end point are presented respectively based on the differential kinemics in the sensor ' s coordinate , and the on - line error compensation methods are introduced subsequently 第二章首先指出機器人腕力傳感器彈性體的彈性變形經過機器人末端連桿、工具、工件等的放大后,會對機器人末端精確定位和運動產生的影響;然后分別研究了傳感器坐標系內的微分運動與機器人末端工件精確定位、運動的關系;在此基礎上,研究了基于腕力傳感器彈性體微分運動的機器人末端定位、運動誤差的誤差矩陣及其在線誤差補償方法;基于機器人動力學的機器人末端定位、運動誤差的誤差矩陣及其在線誤差補償方法;最后,以puma型機器人為對象,給出了基于腕力傳感器內微分運動的機器人末端定位、運動誤差及其在線補償方法的仿真實例:給出了基于機器人動力學的機器人末端定位、運動誤差及其在線補償方法的仿真實例;仿真結果表明, 1 )基于腕力傳感器的機器人末端定位誤差在腕力傳感器允許的載荷下可達十分之幾毫米級。