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本科生畢業(yè)設計 (論文) 外 文 翻 譯 原 文 標 題 A Novel Linear Folding Mechanism: Configuration and Position Precision Analysis 譯 文 標 題 一種新型線性折疊機構(gòu)：配置和定位機構(gòu)分析 作者所在系別 機電工程學院 作者所在專業(yè) 機械設計制造及其自動化 作者所在班級 B13113 作 者 姓 名 張琳怡 作 者 學 號 20134011302 指導教師姓名 劉衛(wèi) 指導教師職稱 副教授 完 成 時 間 2017 年 3 月 13 北華航天工業(yè)學院教務處制 譯文標題 一種新型線性折疊機構(gòu)：配置和定位機構(gòu)分析 原文標題 A Novel Linear Folding Mechanism: Con?guration and Position Precision Analysis 作 者 LeiyuZhang YangYang 譯 名 張磊宇 楊陽 國 籍 中國 原文出處 Advances in Reconfigurable Mechanisms and RobotsⅡ 一種新型線性折疊機構(gòu)：配置和定位機構(gòu)分析 摘要：線性折疊機構(gòu)用于將末端執(zhí)行器移動到所需位置，可以提高安全性，減少多關節(jié)機器人占用的空間。設計了一種矩形塊作為折疊機構(gòu)的通用元件。以剛性方式連接一系列塊以形成折疊臂。四個相鄰塊之間的連接方法?；谶B接方法,幾個配置的遠距觀測儀的機制提出了。此外,折疊臂的定位精度進行了分析,由折疊距離和其他因素的影響。分析結(jié)果表明,提出的折疊臂配置具有高定位精度和長折疊距離。這種類型的線性折疊機制可以應用到服務機器人與人類合作。 關鍵詞 折疊機制 矩形塊 同步帶 精密分析配置 1 介紹 折疊機制通常連接基礎部分和末端執(zhí)行器,以確保遠程終端執(zhí)行器的運動。有幾種類型的機制用于移動遠程處理設備。剪刀高空作業(yè)平臺是典型的類型的望遠鏡設備,廣泛用于高海拔的運轉(zhuǎn)和維護。Enders等人開發(fā)的折疊機制延伸通過引進流體和縮進排氣液體. Lee等人公開了一種用于橋梁運輸系統(tǒng)的折疊管組，其包括多個圓筒形管和延伸/收縮線。Lee等人。 設計了一種由鋼絲和鋼絲組成的鋼絲驅(qū)動雙向折疊機構(gòu)。然而,在這些類型的折疊機制之上,基礎部分的體積相當大為了達到足夠的剛度。此外，終端執(zhí)行器需要一個相當大的擴展長度的差異,以確保一個適當?shù)囊苿涌臻g。此外，終端執(zhí)行器需要一個相當大的擴展長度的差異,以確保一個適當?shù)囊苿涌臻g。因此，折疊機制上面提到的體積收縮狀態(tài)將會十分笨重。 孔等人已經(jīng)開發(fā)了一個可折疊的樣品罐捕獲機制（TSCCM）為翻滾的樣品容器在軌道上檢索。另一個直線折疊機構(gòu)由川淵等人發(fā)明的。包括多個塊。折疊臂以剛性連接的方式實現(xiàn)。黎平和葉濃描述一個往復推送鏈可擴展在它自身的重力下以直線水平方向。推動鏈通常用于將對象從一個位置到另一個地方。一些作者提出使用折疊機制以緊湊的體積為機械臂的發(fā)展方向。然而,上述研究缺乏足夠的配置和相對精度分析. 線性折疊機制提出了一種新型折疊機制。這種類型的折疊機制可以提高安全通過消除這種風險,不可避免的對于一個典型的機器人手臂肘關節(jié),物體在機器人手臂肘關節(jié)時手臂部分之間被關閉。此外,折疊臂組成的塊可以存儲在一個緊湊的情況下。因此,這種機制可以減少空間來容納傳統(tǒng)的關節(jié)。本文幾個配置這種機制的支持。相對位置精度分析的數(shù)值模擬是通過折疊臂的數(shù)學模型。 2 折疊機構(gòu)的結(jié)構(gòu) 有各種各樣新型折疊機構(gòu)的配置。一般來說，這種折疊機構(gòu)包括多個塊、存儲箱、驅(qū)動單元和終端執(zhí)行器。自由連接的塊被存儲在存儲盒中。驅(qū)動單元驅(qū)動的塊可以在任意方向上伸出，并以剛性方式對齊以形成剛性對準。因此,折疊臂可以由剛性的塊對齊，如圖1所示。端部執(zhí)行器安裝在折疊臂前端。這種折疊機構(gòu)與傳統(tǒng)的多關節(jié)機器人相比，收縮狀態(tài)占用更少的空間。 (a) (b) 圖1折疊機構(gòu)的兩種狀態(tài) a收縮狀態(tài)b擴張狀態(tài) 2.1 折疊機構(gòu)的配置 為了保持擴展塊以剛性的方式,本節(jié)提出了幾種連接方法。第一次連接方法具有最高的鉸鏈連接的可靠性，為 在圖2a所示。在自由連接方式的塊可以在相對于下一塊鉸鏈銷轉(zhuǎn)動。鋼絲繩是另一種連接方法，如圖2b所示，對鋼絲繩的兩端分別固定在頭塊和最后一個，所有的塊都使連接在一起。 第三種連接方式是兩個相鄰的塊由同步帶連接，如圖2所示。同步帶，齒形帶，與上表面網(wǎng)格波紋每一塊結(jié)構(gòu)使塊固定以一個剛性的方式。如圖3a所示，有一個鎖緊機構(gòu)和凹進部分的上表面。當鎖機構(gòu)與相鄰塊的相應凹入部分接合時，相鄰塊連接。因此,可以連續(xù)擴展塊固定的最后方法。 (a) (b) 圖2兩個折疊機制的配置 (a) (b) 圖3 另兩個配置折疊機制 基于結(jié)構(gòu)和連接方法,提出了若干折疊機制的配置。為了確保擴展塊相互固定,所有的上表面和正下方相鄰塊的連接形成一個可折疊的手臂。因此,這個線性折疊手臂可以沿任意方向擴展。有一個終端執(zhí)行器安裝在前端的手臂。折疊臂也能承受在任何方向上施加在末端執(zhí)行器上的力。因為有四個連接方法,創(chuàng)建16個組合。這意味著有十六個折疊臂理論上的配置。根據(jù)加載條件和連接的可靠性,四種典型的配置如圖2和3所示。折疊臂的安排并不局限于上述配置的描述。新組合可一滿足一些特定的目的,如最小空間需求和方便的存儲。此外，此外,自由結(jié)合方式可能存儲在一個螺旋面情況下或其他情況下合適的形狀。 在傳動方式的選擇上，可采用鏈輪傳動和蝸桿傳動，將擋塊推離。鏈輪傳動可實現(xiàn)快速延伸和回縮。每一塊在底槽。然后鏈輪與凹槽接合，如圖3所示。由于多邊形效應和嚙合沖擊，末端執(zhí)行器可能產(chǎn)生劇烈振動。鏈輪驅(qū)動的折疊機構(gòu)適用于高速、低精度場合。 與蝸桿傳動折疊臂可以穩(wěn)步擴展，如圖4所示。此外，延伸和回縮的速度是連續(xù)的和光滑的。帶蝸桿傳動的折疊機構(gòu)可代替穆蒂關節(jié)臂在維修機器人中使用。因此，這種折疊臂應該具有很高的定位精度。在2.2章，對折疊機構(gòu)的位置精度進行了詳細的建模和分析。 O M f ,i Oi?1 O G i G 圖4 直線折疊機構(gòu) 2.2 直線折疊機構(gòu)的設計 本節(jié)重點研究了帶蝸輪傳動的折疊機構(gòu)。同步帶的結(jié)合和鉸鏈采用折疊臂的配置,如圖4所示。它的齒形帶前端與第一塊粘合。它的齒嚙合的上表面波紋結(jié)構(gòu)確保相鄰兩塊面之間的緊密聯(lián)系。與鋼絲繩相比,同步帶通常擁有足夠的強度和剛度。在該機制中,一個中國標準的帶,指標選擇10噸。壓力輥用于壓縮帶緊。然后折疊臂由剛性塊的方式支持兩個支撐輪。折疊距離,延長長度,是擴展塊的長度的總和。折疊臂縮回時，同步帶通過刮刀與波紋結(jié)構(gòu)分離。塊是分開的 從剛性排列到離散排列。然而，離散塊仍以鉸鏈連接，可在任何方向彎曲。因此,離散的可安置在一個合適的形狀。 這種線性折疊機制（圖4）是由蝸輪傳動驅(qū)動的。手臂的移動方向相同的方向轉(zhuǎn)動蝸桿的軸。此外，這種機制包括基架可以旋轉(zhuǎn)中心O改變仰角α的折疊臂相對于水平方向。 3 折疊臂位置精度分析 終端執(zhí)行器的位置精度對實現(xiàn)抓取任務非常重要。在塊的重力與物體，同步帶張緊。然后，將彎曲折疊臂。然后終端執(zhí)行器將偏離目標的位置。為了確定偏差,定位精度的數(shù)學模型。為簡化復雜性,符合降低假設在力學模型的推導過程。 (1)鉸鏈中的間隙被忽略。 (2)每個塊的變形被忽略。 4 模擬結(jié)果和討論 對上述數(shù)學模型的計算方法與MATLAB編程。對于這種線性折疊機構(gòu)，最大折疊距離為1500 mm，折疊臂由O形折疊臂組成30塊。計算程序中使用的主要參數(shù)見表1。 通過數(shù)值模擬，得到了折疊臂末端α= 30°的偏差，如圖5所示。橫向偏差dh上漲增加的擴展長度。與此同時,整個偏差在一定長度的增加上升。dh和dv的分布是相似的。折疊臂無負荷的最大偏差是0.104毫米和0.06毫米在水平和垂直方向i= 30,分別。 那么這兩個偏差達到最大值 i = 30,mt= 2.5公斤。 表1直線折疊機構(gòu)主要參數(shù) 圖5 在α= 30°的偏差 水平偏差dh 垂直偏差dv 圖6顯示了仰角α對偏差的影響某些質(zhì)量（mt = 2.5 kg）。但是，仰角α由于折疊臂的限制和基礎框架只能改變?70°到70°。在一定長度的偏差度達到最大時，仰角α等于零，如圖6a所示的。 兩側(cè)，整個偏差dh為折疊臂繞中心旋轉(zhuǎn)向上或向下逐漸降低從水平位置的。dh幾乎為零的偏差時 角α等于 70° 或 ?70°。然而，垂直偏差dv幾乎是零角度時α等于 70° ，0，?70°如圖6B所示。dv 出現(xiàn)偏差的最大值 在上部和下部的旋轉(zhuǎn)范圍內(nèi)。可以發(fā)現(xiàn)偏差dh和dv 有相對的角α雙邊對稱。這是因為兩個偏差是 主要受Mi 這是對稱的角度α。 由于調(diào)頻的限制力F，我總是要滿足式（4）。然后最大值FN，最大的力FN，我可以計算其中Fn，max = 432.38，根據(jù)T的影響 他α和mt參數(shù)以上，力FN，我通過在α= 0和MT = 2.5公斤的數(shù)值模擬獲得的，如圖7所示。可以看出，折疊機構(gòu)的安全負荷 從2.5公斤的有效折疊長度為1500 mm。 圖6 在mt = 2.5 kg.的偏差 水平偏差dh 垂直偏差dv 圖7 力FN,i 5 結(jié)論 （1）該塊采用的折疊機構(gòu)的主要組成部分。四相鄰兩塊之間的連接方法。根據(jù)各連接方式的優(yōu)點提出了機構(gòu)，提供了四個切實可行的折疊配置。 （2）建立了位置精度的數(shù)學模型，得到了擴展長度、質(zhì)量mt和仰角α。 （3）一個精確的模型進行數(shù)值模擬，利用MATLAB。隨著延伸長度或質(zhì)量太增加DH和DV興起的偏差。 因此，這種體積小巧的折疊機構(gòu)具有優(yōu)良的定位精度和較長的折疊長度。 A Novel Linear Folding Mechanism: Con?guration and Position Precision Analysis Abstract: The linear folding mechanism, which is used to move the end effector to a desired position, can enhance the safety and reduce the space to be occupied by the multi-joint robot. A rectangle shaped block is designed as the general element of the folding mechanism. A series of blocks are connected in a rigid manner to form a folding arm. Four connection methods between the adjacent blocks are presented. Based on the connection methods, several con?gurations of the tele- scopic mechanism are proposed. Besides, the position precision of the folding arm is analyzed which is influenced by the folding distance and other factors. The analysis results show that the folding arm with the proposed con?guration possesses high position precision and a long folding distance. This type of linear folding mechanism can be applied to service robots which cooperate with humans. Keywords folding mechanism Rectangle shaped block Con?guration Precision analysis Synchronous belt 1 Introduction The folding mechanism usually connects the base portion and the end effector to ensure the long-distance movement of the end effector. There are several types of this mechanisms used to move a remote handling equipment. The scissors aerial work platform is a typical type of folding equipment that is widely used for high altitude operation and maintenance . A folding mechanism developed by Enders et al. extends by rapidly introducing a fluid and retracts by venting the fluid . Lee et al. disclosed a folding tube set for a bridge transport system, which includes several cylindrical tubes and extension/retraction lines. Lee et al. designed a wire-driven bidirectional folding mechanism consisting of stages and steel wires. However, in these types of folding mechanisms above, the volume of the base portion is quite large in order to achieve suf?cient stiffness. In addition, the end effector needs a considerable difference in extension lengths so as to ensure an adequate moving space. As a result, the volume of folding mechanisms men- tioned above in the contraction state will be quite bulky. Kong et al. have developed a telescoping sample canister capture mechanism (TSCCM) for retrieval of tumbling sample containers on orbit. Another linear-motion folding mechanism invented by Kawabuchi et al. includes a plurality of blocks. A folding arm is achieved in a manner that blocks are rigidly connected with each other. Liping and Yenong escribe a reciprocating pushing chain which can be extended horizontally in a straight line under its own gravity. The pushing chain is usually used to push objects from one position to another. Several authors have proposed the use of folding mechanisms with the compact volume as the development direction of the robot arm. However, the researches above lack of enough con?gurations and the relative precision analysis. The linear folding mechanism presented in this paper is a novel folding mechanism. This type of folding mechanism can enhance safety by eliminating such a risk, inevitable for a typical robot arm having an elbow joint, that an object around the robot arm gets caught between arm sections when the elbow joint is closed. Besides, the folding arm consisting of blocks can be stored in a compact case. Hence this mechanism can reduce the space to be occupied by the traditional multi-joint robot. In this paper several con?gurations of this mechanism are pro- posed. The relative position precision analysis is achieved through the numerical simulation of the mathematical model of the folding arm. 2 Structure of the Folding Mechanism There are a variety of con?gurations of this novel folding mechanism. Generally, this folding mechanism includes a plurality of blocks, a storage case, drive units and an end effector. The freely-jointed blocks are stored in the storage case. The blocks driven by drive units are possible to be extended out in an arbitrary direction and aligned in a rigid manner to form a rigid alignment. Hence, a folding arm can be composed of the blocks in the rigid alignment, as shown in Fig. 1. The end effector is installed at the front end of the folding arm. This type of folding mechanism in a retraction state occupies less space compared with the traditional multi-joint robot. (a) (b) Fig. 1 Two states of the folding mechanism. a Retraction state, b Extension state 2.1 Con?gurations of the Folding Mechanism In order to keep the extended block in a rigid manner, several connection methods are proposed in this section. The ?rst connection method is the hinge which has the highest connection reliability, as shown in Fig. 2a. The block in the freely jointed manner can rotate around a hinge pin relative to the next block. The wirerope is another connection method, as shown in Fig. 2b. Both ends of the wirerope are ?xed on the head block and the end one, respectively. All the blocks are stringed together. The third connection method is that two adjacent blocks are connected by the synchronous belt, as shown in Fig. 2. The synchronous belt, toothed belt, meshes with the upper-surface corrugated structures of each block to make the blocks ?xed to each other in a rigid manner. As shown in Fig. 3a, there is a latch mechanism and a recessed portion in the upper-surface. When the latch mechanism engages with the corresponding recessed portion of the adjacent block, the adjacent block is connected. Hence, the extended blocks can be serially ?xed by the last method. (a) (b) Fig. 2 Two con?guration of the folding mechanism (a) (b) Fig. 3 The other two con?guration of the folding mechanism Based on the structures and the connection methods, several con?gurations of the folding mechanism are presented. In order to ensure the extended blocks ?xed to each other ?rmly, all the upper-surface and the underface are connected to these of the adjacent block forming a folding arm. Hence, this linear folding arm can be extended along an arbitrary direction. There is a end effector installed at the front end of the arm. The folding arm also can bear the forces imposed on the end-effector in any direction. Since there are four connection methods, sixteen combinations are created. That means that there are sixteen con?gurations of the folding arm theoretically. According to loading conditions and the reliability of connections, four typical con?gurations are illustrated in Figs. 2 and 3. The arrangement of the folding arm is not limited to the description of con?gurations above yet. A new combination can be proposed for some certain purposes, such as minimum space requirements and the convenience of storage. Furthermore, the blocks in free-jointed manner may be stores in a helicoids case or other cases with suitable shape. On the selection of the drive modes, both the sprocket drive and the worm drive can be adopted to push the blocks out of the storage case. The sprocket drive can accomplish the rapid extension and retraction. Each block has a groove in the undersurface. Then the sprocket engages with the groove, as shown in Fig. 3. A drastic vibration of end effector may generate owing to the polygon effect and meshing impact. The folding mechanism driven by the sprocket is suitable for high speed and low precision occasions. The folding arm with the worm drive can be extended steadily, as shown in Fig. 4. Besides, the velocity of the extension and retraction is continuous and smooth. The folding mechanism with the worm drive can be used in the service robots instead of muti-jointed arms. Hence, this type of folding arm should have high position precision. In the Sect. 2.2, the position precision of the folding mechanism is modelled and analyzed in detail. O M f ,i Oi?1 O G i G Fig. 4 The linear folding mechanism 2.2Design of the Linear Folding Mechanism The research focused on the folding mechanism with the worm gear drive is presented in this section. The combination of the synchronous belt and the hinge is adopted as the con?guration of the folding arm, as shown in Fig. 4. The front end of the toothed belt and the ?rst block are bonded. The teeth mesh with the upper-surface corrugated structures to ensure the close contact between the upsides of two adjacent blocks. Compared with wireropes, the synchronous belt generally owns suf?cient strength and rigidity. In this mechanism, a Chinese standard belt, Metric T Pd: T10, is chosen. The pinch rollers are used to compress the belt tightly on the block. Then the folding arm composed of the blocks in rigid manner is supported by two return roller. The folding distance, extended length, is the sum of the lengths of the extended blocks. When the folding arm is retracted, the synchronous belt is separated from the corrugated structures by a scraper. The blocks are separated from the rigid arrangement to the discrete arrangement. However, the discrete blocks are still connected by hinges and can be flexed in any direction. Therefore, the discrete ones can be housed inside a case with suitable shape. This linear folding mechanism (Fig. 4) is driven by the worm gear drive. The moving direction of the arm is the same as the direction of a rotational axis of the worm. Besides, this mechanism including the base frame can rotate around the center O to change the elevation angle α of the folding arm relative to the horizontal direction. 3 Position Precision Analysis of the Folding Arm The position precision of the end effector is very important to achieve the task of grasping. Under the gravity of the blocks and the objects, the synchronous belt is tensioned. Then, the folding arm will be bent. The end effector will deviate from the target location. In order to determine the deviations, the mathematical model of the position precision should be established. For simplifying complexity, the fol- lowing assumptions are made in the derivation of the mechanical model . . (1)The clearances in the hinges are neglected. (2)The deformation of each block is neglected. 4 Simulations and Discussions The calculation algorithm for the mathematical model above is programmed with MATLAB. For this linear folding mechanism, the maximum folding distance is 1500 mm and the folding arm consists of 30 blocks. The main parameters used in the calculation program are listed in Table 1. Through the numerical simulation, the deviations of the end of the folding arm at α = 30° are obtained, as shown in Fig.5. The horizontal deviation dh rises with the increasing of the extended length. Meanwhile, the whole deviations at the certain length rise along with the increasing of mt. The distribution of dh and dv are similar. The maximal deviations of the folding arm with no loads are 0.104 mm. Main parameters Value Main parameters Value Ks/(N/mm) 1 × 106 μ 0.3 h/mm 40 G/N 1.08 l/mm 50 mt/kg 2 N 30 Fm/N 26 rp/mm 5 β/(°) 40 Table 1 Main parameters of the linear folding mechanism Fig. 5 The deviations at α = 30°. a The horizontal deviation dh, b The vertical deviation dv and 0.06 mm in the horizontal and vertical directions at i = 30, respectively. Then the two deviations reach a maximum at i = 30 and mt = 2.5 kg. Figure 6 shows the influences of the elevation angle α on the deviations at the certain mass (mt = 2.5 kg). However, the elevation angle α can only change form ?70° to 70° due to the restrictions of the folding arm and the base frame. The deviations dh at a certain length reach a maximum when the elevation angle α is equal to zero, as shown in Fig. 6a. Besides, the whole deviations dh are reduced gradually as the folding arm is rotated around the center O upwards or down- wards from the horizontal position. The deviations dh are nearly zero when the angle α is equal to 70° or ?70°. However, the vertical deviations dv are nearly to zero when the angle α is equal to —70○, 0 or 70○, as shown in Fig. 6b. The maximum values of the deviations dv appear in the upper area and the lower area of the rotation range. It can be found that the deviations dh and dv have the bilateral symmetry relative to the angle α. That is because the two deviations are mainly affected by the moment Mi which is symmetrical to the angle α. Fig. 6 The deviations at mt = 2.5 kg. a The horizontal deviation dh, b The vertical deviation dv Fig. 7 The forces FN,i 5 Conclusions (1)The blocks are adopted as the major components of the folding mechanism. Four connecting methods between two adjacent blocks are presented. Meanwhile, four feasible con?gurations of the folding mechanism are proposed according to the advantages of each connecting method. (2)The mathematical model of the position precision is established to acquire the influences of the extended length, the mass mt and the elevation angle α. (3)A numerical simulation of the precision model is conducted using MATLAB. The deviations dh and dv rise with the increasing of the extended length or the mass mt. Hence, this type of folding mechanism with the compact volume possesses thethe excellent position precision and the long folding length. 第 45 頁 指 導 教 師 評 語 外文翻譯成績： 指導教師簽字： 年 月 日 注：1. 指導教師對譯文進行評閱時應注意以下幾個方面：①翻譯的外文文獻與畢業(yè)設計（論文）的主題是否高度相關，并作為外文參考文獻列入畢業(yè)設計（論文）的參考文獻；②翻譯的外文文獻字數(shù)是否達到規(guī)定數(shù)量（3 000字以上）；③譯文語言是否準確、通順、具有參考價值。 2. 外文原文應以附件的方式置于譯文之后。 第15頁