本文關(guān)鍵詞：重載并聯(lián)穩(wěn)定平臺構(gòu)型綜合與軌跡規(guī)劃研究　出處：《燕山大學(xué)》2015年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 并聯(lián)穩(wěn)定平臺 重載 力傳遞性 多輸入 非慣性系 躍度映射 軌跡規(guī)劃

【摘要】：火箭在海洋運輸過程中,受到海浪擾動的影響,會產(chǎn)生較大的傾斜和振動。穩(wěn)定平臺可以隔離船體搖蕩對箭體的作用,保證箭體及箭載設(shè)備的運輸安全。本文針對現(xiàn)有穩(wěn)定平臺產(chǎn)品載荷小,難以用于火箭運輸?shù)膯栴}開展研究,主要內(nèi)容如下:對并聯(lián)機構(gòu)的力傳遞性和承載能力進行了分析。給出并聯(lián)機構(gòu)力傳遞性的概念,定義了力傳遞性評價指標,提出一種計算標準化模型所能承受最大外力極值的方法。根據(jù)運動形式的不同,將并聯(lián)機構(gòu)的承載能力分為靜態(tài)承載能力和動態(tài)承載能力,并給出計算方法。力傳遞性和承載能力相結(jié)合,可為重載并聯(lián)機構(gòu)的設(shè)計和評價提供指導(dǎo)。對適用于重載的并聯(lián)機構(gòu)多輸入驅(qū)動方式進行了研究。首先根據(jù)冗余驅(qū)動力性質(zhì)和對動平臺作用效果的不同,提出兩種冗余驅(qū)動的分類方法�；诓煌愋偷娜哂囹�(qū)動,綜合出動平臺靜載平衡伴隨冗余驅(qū)動、關(guān)節(jié)靜載平衡伴隨冗余驅(qū)動、重力平衡主動冗余驅(qū)動三種適用于重載的冗余驅(qū)動方式。提出一種多輸入非冗余驅(qū)動方式,綜合出多輸入非冗余驅(qū)動單元和驅(qū)動分支。以上述驅(qū)動方式為基礎(chǔ)構(gòu)造了六種并聯(lián)機構(gòu),對于其中分支自由度大于6的3(2UPS-R)/PU機構(gòu)進行了詳細分析�；谛坷碚撻_展非慣性系下并聯(lián)機構(gòu)躍度的研究。定義了剛體的空間躍度、物體躍度和耦合物體躍度,并證明空間躍度和耦合物體躍度是旋量,而物體躍度不是旋量。推導(dǎo)出多剛體系統(tǒng)的躍度伴隨變換和伴隨映射表達式,得到了穩(wěn)定平臺系統(tǒng)各剛體間的躍度變換關(guān)系。建立了并聯(lián)機構(gòu)躍度映射模型,得到表征這種映射的三階影響系數(shù)矩陣。結(jié)合穩(wěn)定平臺系統(tǒng)剛體之間躍度變換和并聯(lián)機構(gòu)躍度映射,得到了非慣性系下并聯(lián)機構(gòu)的躍度映射模型。根據(jù)剛體角速度與歐拉角時間導(dǎo)數(shù)的關(guān)系,建立了剛體角躍度與歐拉角三階時間導(dǎo)數(shù)的映射。研究了非慣性系下穩(wěn)定平臺的軌跡規(guī)劃方法。利用準均勻分布B樣條曲線的特點,建立了動平臺運動參數(shù)的線性約束,以動平臺躍度與穩(wěn)定平臺主動關(guān)節(jié)躍度的加權(quán)平方和最小為目標求解樣條曲線的控制頂點,進而得到運輸過程中動平臺相對慣性系的運動規(guī)律。介紹了穩(wěn)定平臺地面試驗系統(tǒng)的電氣和軟件控制系統(tǒng)。參與研制了地面試驗系統(tǒng),在此基礎(chǔ)上開展實驗研究,驗證了增加配重可以有效的提高機構(gòu)的承載能力。將穩(wěn)定平臺動平臺在慣性系中的等效運動在地面試驗系統(tǒng)上實現(xiàn),驗證了所得運動軌跡的可行性。
[Abstract]:In the process of ocean transportation, the rocket will be inclined and vibrated by the wave disturbance, and the stable platform can isolate the effect of the ship rocking on the arrow body. In order to ensure the transportation safety of arrows and arrow-borne equipment, this paper aims at the problem that the product of the existing stable platform has small load and is difficult to be used in rocket transportation. The main contents are as follows: the force transfer and bearing capacity of parallel mechanism are analyzed, the concept of force transfer of parallel mechanism is given, and the evaluation index of force transfer is defined. A method for calculating the maximum external force extremum of the standardized model is proposed. According to the different motion forms, the bearing capacity of the parallel mechanism is divided into static bearing capacity and dynamic bearing capacity. The calculation method, the combination of force transitivity and bearing capacity are also given. It can provide guidance for the design and evaluation of heavy-load parallel mechanism. The multi-input drive mode suitable for heavy load parallel mechanism is studied. Firstly, according to the nature of redundant driving force and the different effect on moving platform. Two kinds of redundant driving classification methods are proposed. Based on different types of redundant drivers, combined platform static load balance accompanied by redundant drive, joint static load balance accompanied with redundant drive. There are three redundant driving modes for heavy-duty gravity balancing active redundancy drive. A multi-input non-redundant drive mode is proposed. The multi-input non-redundant drive units and driving branches are synthesized and six kinds of parallel mechanisms are constructed based on the above driving modes. Based on spinor theory, the jump degree of parallel mechanism under non-inertial frame is studied in detail. The spatial hopping of rigid body is defined. It is proved that the spatial hops and coupled hops are spinor, but the hops are not spinor. The expressions of the adjoint transformation and adjoint mapping for multi-rigid body systems are derived. The hops transformation relationship among the rigid bodies of the stable platform system is obtained, and the jump mapping model of the parallel mechanism is established. The third-order influence coefficient matrix representing this mapping is obtained, which combines the hop transformation between rigid bodies of stable platform system and the hop mapping of parallel mechanism. Based on the relationship between angular velocity of rigid body and time derivative of Euler angle, the jump mapping model of parallel mechanism under non-inertial system is obtained. The mapping between angular hops of rigid body and the third order time derivative of Euler angle is established. The trajectory planning method of stable platform under non-inertial frame is studied. The characteristic of quasi-uniform distribution B-spline curve is used. The linear constraint of the moving platform motion parameters is established, and the control points of the spline curve are solved with the minimum of the weighted square sum of the moving platform jump and the stable platform active joint jump. Then the motion law of the moving platform relative to the inertial system is obtained. The electrical and software control system of the ground test system of the stabilized platform is introduced and the ground test system is developed. On this basis, the experimental research is carried out, which proves that increasing the counterweight can effectively improve the bearing capacity of the mechanism. The equivalent motion of the stable platform in the inertial system is realized on the ground test system. The feasibility of the motion trajectory is verified.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TB535;V553.19

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