本文關(guān)鍵詞：鉆井液振動篩篩網(wǎng)動力學(xué)特性研究　出處：《西南石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 鉆井液振動篩篩網(wǎng) 安裝方法 自由振動 強迫振動 剛?cè)狁詈蟿恿W(xué)

【摘要】：篩網(wǎng)是鉆井液振動篩上重要的組成部件,也是鉆井工程中的一種易耗品,在振動篩工作過程中篩網(wǎng)始終與鉆井液直接接觸并相互作用,篩網(wǎng)的實際振動軌跡特點、靜態(tài)及動態(tài)特征等因素最終決定著巖屑在篩網(wǎng)上的分離粒度、運動速度、排屑量和液體處理量等參數(shù)。隨著技術(shù)進步,篩網(wǎng)的制造工藝水平逐漸提高,結(jié)構(gòu)設(shè)計更加豐富,安裝方法更加便捷可靠,但近年來對于新型篩網(wǎng)、新型安裝方式的研究并不完善,甚至是缺失的。因此,為提高篩網(wǎng)使用壽命,為振動篩、篩網(wǎng)及其安裝裝置的設(shè)計和改進提供依據(jù),需要對不同安裝方式下,不同類型篩網(wǎng)的動力學(xué)特性進行更加深入的研究。 本文從以下五個方面對篩網(wǎng)進行了相關(guān)研究。 1.通過查閱國內(nèi)外文獻資料,對有關(guān)篩網(wǎng)研究的發(fā)展與現(xiàn)狀、市場中被廣泛應(yīng)用的篩網(wǎng)的編織方式以及國內(nèi)外現(xiàn)行的篩網(wǎng)標準規(guī)格進行了總結(jié),對不同種類篩網(wǎng)的結(jié)構(gòu)特征、應(yīng)用范圍和安裝方法進行了分析。 2.推導(dǎo)了普通單層篩網(wǎng)的自由振動方程,得到了篩網(wǎng)兩胯間的固有頻率的計算公式；提出將螺栓繃緊方法安裝的平板式篩網(wǎng)模型簡化為彈性支承多跨單向連續(xù)矩形薄板模型,利用傳遞矩陣方法推導(dǎo)出了整張篩網(wǎng)的傳遞方程,得到篩網(wǎng)自由振動的頻率方程,對某型號篩網(wǎng)的自由振動特征方程進行數(shù)值求解,得到不同螺栓預(yù)緊力、不同橡膠支撐條數(shù)目及剛度下篩網(wǎng)的固有頻率,分析表明這三種參數(shù)均與篩網(wǎng)的固有頻率呈正相關(guān)性,并且互相之間有一定影響；對框架式篩網(wǎng)進行模態(tài)仿真分析,得到了兩種不同框架式篩網(wǎng)的前十階固有頻率及振型云圖,對振型進行了分析。 3.建立了雙電機直線振動篩、三電機橢圓振動篩的運動方程,求解得到了其穩(wěn)態(tài)解；對剛?cè)狁詈隙囿w動力學(xué)發(fā)展的四個階段進行了總結(jié),簡要介紹了動力學(xué)仿真軟件—RecurDyn,并對模態(tài)柔性體建模方法(RFlex)、有限元柔性體建模(FFlex)方法進行對比分析,總結(jié)得到兩種方法的建模流程。 4.為了研究篩網(wǎng)在電機激振作用下的強迫振動響應(yīng),建立了三電機雙軌跡振動篩剛體仿真樣機,對樣機進行了測試,使用有限元多柔體動力學(xué)(MFBD)技術(shù),建立了三種安裝方式下篩箱-篩網(wǎng)的剛?cè)狁詈蠘訖C,仿真分析后,通過對不同樣機、不同網(wǎng)面位置以及不同螺栓預(yù)緊力大小、壓緊程度、方管梁布置方式、振型、支撐條數(shù)目、激振力大小下的振動和應(yīng)力響應(yīng)進行對比分析,得到了每種安裝方法下篩網(wǎng)的性能特點,從動力學(xué)角度總結(jié)了各自的優(yōu)缺點,該種仿真方法能夠為篩網(wǎng)的結(jié)構(gòu)設(shè)計、安裝方法以及疲勞損傷的評估等提供數(shù)據(jù)參考。除此之外,為了驗證仿真結(jié)果,對雙電機直線振動篩的篩箱和螺栓繃緊式安裝的平板篩網(wǎng)的振動加速度進行了實驗測試,在證明仿真樣機的同時,研究了螺栓預(yù)緊力對篩網(wǎng)拋擲指數(shù)的影響。 5.提出一種新型篩網(wǎng)安裝方法,并對裝置進行了初步設(shè)計,對裝置中主軸進行了模態(tài)仿真分析,認為其可以安裝在篩箱上隨振動篩一起工作。對該裝置安裝下的篩網(wǎng)進行了強迫振動仿真分析,研究結(jié)果顯示,該種安裝方法可以保證篩網(wǎng)具有較高的使用壽命的同時擁有理想的拋擲指數(shù)。
[Abstract]:The screen is on the drilling fluid shaker is an important component of a consumable is in drilling engineering, in the process of vibrating screen in screen work has always been in direct contact with the drilling fluid and interaction, the actual trajectory characteristics of vibration screen, static and dynamic characteristics and other factors that ultimately determines the separation size, on the screen of the cuttings movement speed, chip volume and liquid handling parameters. With the development of technology, manufacturing technology level of screen gradually increased, structure design is more abundant, more convenient and reliable installation method, but in recent years for the research of new novel screen, installation is not perfect, or even missing. Therefore, in order to improve the service life of the screen. For the vibrating screen, and provide a basis for improved design of screen and its mounting device, the need for different installation methods, a more in-depth study of dynamic characteristics of different types of screen.
This article has carried on the related research to the screen net from the following five aspects.
1. through the domestic and foreign literature, the development and the status quo on screen research, weaving mesh is widely used in the market at home and abroad as well as the current screen specifications are summarized, the structure characteristics of the different kinds of screen, the scope of application and installation methods are analyzed.
2. the formula of the free vibration equation of single screen, the formula of natural frequency between the screen two hips; the elastic support for multi span continuous unidirectional rectangular thin plate flat screen model simplified model installation method using bolt taut, deduced the transfer equation of the whole mesh transfer matrix method, the frequency equation mesh free vibration, numerical solution of characteristic equation of free vibration of a certain type of screen, get different bolt preload, different rubber support number and stiffness under the screen natural frequency analysis showed that these three parameters were positively correlated with the natural frequency of the screen, and has a certain influence each other; modal simulation analysis of the frame type screen, to obtain the first ten natural frequencies and vibration modes of two different frame type screen images, the vibration modes are analyzed.
3. to establish a dual motor linear vibrating screen, the equations of motion of the three motor elliptical vibrating screen, obtained the steady solution; four stages of multibody dynamics development are summarized and briefly introduced the dynamics simulation software RecurDyn, and the mode of flexible body modeling method (RFlex), flexible finite element body modeling (FFlex) method for comparative analysis, summarize the modeling process by the two methods.
4. in order to study the forced vibration sieve in motor excitation response, a rigid body simulation prototype of three motor double track vibration sieve, the prototype was tested using finite element multi-body dynamics (MFBD) technology, rigid flexible coupling prototype is established under three kinds of installation method of screen box - screen, simulation analysis later, according to the different prototype, different mesh position and different bolt preload, compression degree, square beam arrangement mode, supporting the number of vibration of the vibrating force and the stress response were analyzed, obtained the performance characteristics of each installation method under the screen, from the point of view of dynamics summarizes the advantages and disadvantages, the simulation method can screen for structure design, installation method and fatigue damage assessment to provide reference data. In addition, in order to verify the simulation results, the screen box machine electric double linear vibrating screen The vibration acceleration of the flat plate screen with bolt tightening is tested. The influence of the bolt preload on the throwing index of the screen is proved.
The 5. method is proposed to install a new device on the screen, and has carried on the preliminary design of the device, the spindle modal simulation analysis, it can be installed in the sieve box with vibration sieve to work together. The device is installed on the screen was analyzed under forced vibration simulation, results show that the method can be installed ensure the screen has longer service life and have the ideal throwing index.

【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TE92

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