本文選題：液浮陀螺儀 + 應(yīng)力狀態(tài)�。� 參考：《北京理工大學(xué)》2014年博士論文

【摘要】：作為慣性導(dǎo)航系統(tǒng)中的關(guān)鍵儀表之一，液浮陀螺儀在我國(guó)國(guó)防領(lǐng)域起著至關(guān)重要的作用。目前在我國(guó)液浮陀螺儀等一類精密機(jī)械系統(tǒng)的裝配過程中，常常會(huì)出現(xiàn)所有的零件加工精度都滿足設(shè)計(jì)要求，但裝配后精度與穩(wěn)定性卻不高的現(xiàn)象。究其原因主要是零件的制造特性與系統(tǒng)精度之間的關(guān)系尚無有效的定量分析方法。而系統(tǒng)的精度與穩(wěn)定性很大程度上受到了零組件裝配之后的應(yīng)力狀態(tài)的影響。因此，本文以某型液浮陀螺儀為研究對(duì)象，從零件表面形狀誤差建模入手，研究表面形狀誤差等制造特性對(duì)液浮陀螺儀零組件應(yīng)力狀態(tài)的影響機(jī)理，探索建立液浮陀螺儀零組件制造特性與系統(tǒng)工作精度關(guān)系的定量分析方法。 本文首先論述了開展液浮陀螺儀零組件制造特性與應(yīng)力狀態(tài)影響研究的目的與意義，然后就國(guó)內(nèi)外相關(guān)領(lǐng)域的研究現(xiàn)狀與方法進(jìn)行了綜述與總結(jié)。針對(duì)目前液浮陀螺儀等一類精密機(jī)械系統(tǒng)精度及穩(wěn)定性研究中存在的問題，開展了如下研究： （1）以平面形狀誤差為研究對(duì)象，開展了表面形狀誤差建模研究。根據(jù)表面形狀誤差測(cè)量數(shù)據(jù)，利用離散余弦變換構(gòu)建基形狀向量，建立了基于基函數(shù)線性相加的表面形狀誤差模型。然后利用該方法對(duì)二維、三維配合實(shí)例進(jìn)行了形狀誤差建模，驗(yàn)證了模型的正確性。在形狀誤差建模之前先對(duì)測(cè)量數(shù)據(jù)進(jìn)行樣條插值處理，能夠極大提高形狀誤差的建模精度。 （2）在考慮表面形狀誤差的基礎(chǔ)上，提出了分析帶有表面形狀誤差的平面配合面接觸狀態(tài)的改進(jìn)差表面法，通過理論分析與實(shí)驗(yàn)研究了裝配時(shí)配合面的形狀誤差對(duì)零件接觸狀態(tài)的影響情況。依據(jù)逆向工程思想，根據(jù)零件幾何形狀誤差的測(cè)量數(shù)據(jù)建立帶有誤差的三維幾何模型，通過數(shù)值仿真和實(shí)驗(yàn)研究驗(yàn)證了所提方法的有效性。 （3）研究了液浮陀螺儀中浮子的制造特性對(duì)其應(yīng)力狀態(tài)的影響�；诹黧w力學(xué)、流固耦合動(dòng)力學(xué)有關(guān)理論建立了液浮陀螺儀中流體的運(yùn)動(dòng)方程，并由此推導(dǎo)得到浮子表面的受力情況。再基于計(jì)算流體動(dòng)力學(xué)通過有限體積法對(duì)流體運(yùn)動(dòng)以及浮子受力進(jìn)行了仿真分析，設(shè)計(jì)并開展了不同粗糙度條件下浮子表面受力與液浮陀螺儀零位信號(hào)實(shí)驗(yàn)研究。 （4）在考慮液浮陀螺儀零組件的制造特性的前提下，開展了溫度場(chǎng)變化對(duì)液浮陀螺儀組件應(yīng)力狀態(tài)及變形的影響研究。基于傳熱學(xué)以及熱-結(jié)構(gòu)耦合基本理論，通過數(shù)值仿真方法分析了液浮陀螺儀在溫度變化時(shí)溫度場(chǎng)分布及其引起的熱應(yīng)力情況。在考慮液浮陀螺儀零組件的制造特性的前提下，分析了溫度場(chǎng)作用對(duì)液浮陀螺儀關(guān)鍵零組件應(yīng)力狀態(tài)與變形的影響。 （5）研究了不同制造特性對(duì)液浮陀螺儀裝配時(shí)應(yīng)力狀態(tài)影響情況。針對(duì)五套液浮陀螺儀，，通過有限元法從形狀誤差、相對(duì)位置、預(yù)緊力三個(gè)方面研究液浮陀螺儀零組件制造特性對(duì)其應(yīng)力狀態(tài)與變形的影響情況，并依據(jù)單因素法對(duì)應(yīng)力狀態(tài)和變形靈敏度進(jìn)行了定性分析，獲得不同制造特性對(duì)液浮陀螺儀應(yīng)力狀態(tài)的影響情況。
[Abstract]:As one of the key instruments in inertial navigation system , the liquid - float gyroscope plays an important role in the defense field of our country . At present , in the assembly process of a kind of precision machinery system , such as liquid - float gyroscope in China , all parts processing precision can meet the design requirements . However , the accuracy and stability of the system are largely influenced by the stress state after the assembly of the components . Therefore , the paper studies the influence mechanism of the manufacturing characteristics of the surface shape error on the zero component stress state of the liquid - floating gyro , and explores the quantitative analysis method of the relationship between the manufacturing characteristics of the zero component of the liquid - floating gyro and the system working accuracy .

In this paper , the purpose and significance of the research on the influence of the manufacturing characteristics and the stress state of the zero component of the liquid - float gyroscope are discussed firstly , and then the present situation and method of the research on the relevant field of the liquid - floating gyroscope are summarized and summarized . The problems existing in the research of precision and stability of the precision machinery system such as the liquid - floating gyroscope are studied as follows :

( 1 ) Based on the surface shape error measurement data , a surface shape error model based on the linear addition of the basis function is established by using the discrete cosine transform to construct the base shape vector . Then the shape error model is modeled by using the method to model the shape error of the two - dimensional and three - dimensional matching example .

( 2 ) On the basis of considering the surface shape error , the paper presents an improved differential surface method for analyzing the contact state of the plane with the surface shape error . Based on the theory analysis and experiment , the influence of the shape error of the mating surface on the contact state of the part is studied . According to the reverse engineering idea , a three - dimensional geometric model with error is established according to the measurement data of the geometric shape error of the part , and the validity of the proposed method is verified by numerical simulation and experimental study .

( 3 ) The influence of the manufacturing characteristics of the float in the liquid - float gyroscope on its stress state is studied . Based on the theory of fluid mechanics and fluid - solid coupling dynamics , the motion equation of the fluid in the liquid - float gyroscope is established , and the stress of the surface of the float is deduced . Based on the computational fluid dynamics , the fluid motion and the force of the float are simulated and analyzed by the finite volume method , and the zero - position signal experiment of the float surface under different roughness conditions is designed and carried out .

( 4 ) The influence of temperature field change on the stress state and deformation of the liquid - float gyroscope component is studied under the precondition of considering the manufacturing characteristics of the zero component of the liquid - float gyroscope . Based on the theory of heat transfer and thermal - structural coupling , the temperature field distribution and the thermal stress caused by the liquid - float gyroscope are analyzed by numerical simulation method .

( 5 ) The influence of different manufacturing characteristics on the stress state of the liquid - floating gyroscope is studied . The influence of the manufacturing characteristics of the zero component of the liquid - float gyroscope on the stress state and deformation is studied by finite element method from three aspects of shape error , relative position and pre - tightening force , and the influence of different manufacturing characteristics on the stress state of the liquid - floating gyroscope is obtained .
【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN96

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