網(wǎng)狀編織結構力學性能分析
發(fā)布時間：2019-06-14 12:21
【摘要】：大功率無源微波部件以及天線中的電磁波干擾問題,嚴重影響著衛(wèi)星通信系統(tǒng)的設計、實現(xiàn)及正常穩(wěn)定的工作。網(wǎng)狀反射面天線是移動通信、電子偵察、數(shù)據(jù)中繼、微波遙感等衛(wèi)星上的關鍵設備之一,然而,天線上用于反射和接收信號的網(wǎng)狀編織結構──金屬網(wǎng),是產(chǎn)生電磁波干擾的關鍵非線性部件之一。電磁波干擾問題是由網(wǎng)狀反射面固有非線性引起的,非線性主要包括接觸非線性和材料非線性。接觸非線性在金屬網(wǎng)結構中不可避免,是產(chǎn)生干擾的主要根源。研究發(fā)現(xiàn),金屬網(wǎng)接觸結的接觸力直接決定了接觸非線性。因此,對網(wǎng)狀反射面進行力學分析,獲得其接觸力,具有重要研究意義。另外,本文研究的網(wǎng)狀反射面力學分析方法,為網(wǎng)狀反射面的精確建模,以及后期的力學分析奠定了基礎。本文針對網(wǎng)狀天線金屬網(wǎng)編織結構復雜、力學建模困難且存在尺寸非線性效應等問題,研究了金屬網(wǎng)結構的分形力學方法,主要研究內(nèi)容為:1.研究小尺寸金屬網(wǎng)結構的彈性性能。首先,結合圖像測量、樣條插值、截面掃描以及編織單元拼接等方法建立金屬網(wǎng)結構的幾何模型,并獲得其力學模型,進而借助仿真分析探究其力學性能,驗證網(wǎng)狀反射面金屬網(wǎng)結構的正交各向異性性能。然后,采用仿真分析與有限元技術研究具有正交各向異性性質的金屬網(wǎng)結構,探究其力學等效的方法,利用正交各向異性平面應力結構描述金屬網(wǎng)結構的力學性能。最后,建立彈性性能參數(shù)識別的數(shù)學模型,獲得小尺寸金屬網(wǎng)的等效彈性性能參數(shù)。2.研究金屬網(wǎng)結構的分形力學分析方法。以小尺寸金屬網(wǎng)參數(shù)為基礎,研究金屬網(wǎng)結構的分形力學分析,揭示其分形特征。首先,研究金屬網(wǎng)結構小島分維和計盒分維的計算方法,并利用這兩種分維描述金屬網(wǎng)的分形特征。接下來,利用推廣的Sierpinski毯描述金屬網(wǎng)結構的力學性能,推導金屬網(wǎng)結構的剛度矩陣,建立彈性性能參數(shù)與金屬網(wǎng)尺寸間的關系,基于小尺寸金屬網(wǎng)結構參數(shù)預測大尺寸金屬網(wǎng)的力學參數(shù)。最后,通過算例驗證了該方法的可行性。3.研究網(wǎng)狀反射面金屬網(wǎng)接觸力的統(tǒng)計分析。從統(tǒng)計學的角度,研究網(wǎng)狀反射面上指定區(qū)域的接觸力統(tǒng)計分布規(guī)律。以偏饋環(huán)形桁架式網(wǎng)狀可展開天線為例,根據(jù)網(wǎng)狀反射面金屬網(wǎng)力學分析的思路,編制應用性強的界面程序,研制網(wǎng)狀反射面金屬網(wǎng)接觸力分析軟件,通過圖形用戶界面呈現(xiàn)分析結果,給出網(wǎng)狀反射面指定區(qū)域金屬網(wǎng)接觸力均值的分布云圖,以及指定接觸結的接觸力。
[Abstract]:The problem of electromagnetic wave interference in high power passive microwave components and antennas seriously affects the design, realization and normal stability of satellite communication system. Mesh reflector antenna is one of the key equipment on mobile communication, electronic reconnaissance, data relay, microwave remote sensing and other satellites. However, the mesh braided structure used to reflect and receive signals on the antenna is one of the key nonlinear components to produce electromagnetic wave interference. The electromagnetic wave interference problem is caused by the inherent nonlinear of the reticulated reflector, which mainly includes contact nonlinear and material nonlinear. Contact nonlinear is inevitable in metal mesh structure and is the main source of interference. It is found that the contact force of metal mesh contact junction directly determines the contact nonlinear. Therefore, it is of great significance to analyze the mechanics of the reticulated reflector and obtain its contact force. In addition, the mechanical analysis method of reticular reflector studied in this paper lays a foundation for the accurate modeling of reticulated reflector and the later mechanical analysis. In order to solve the problems of complex braided structure, difficult mechanical modeling and size nonlinear effect, the fractal mechanics method of metal mesh structure is studied in this paper. the main research contents are as follows: 1. The elastic properties of small size metal mesh structure are studied. Firstly, the geometric model of metal mesh structure is established by image measurement, Spline interpolation, cross section scanning and braided element splicing, and its mechanical model is obtained, and then its mechanical properties are investigated by simulation analysis, and the orthotropic properties of reticulated reflector metal mesh structure are verified. Then, the metal mesh structure with orthotropic properties is studied by simulation analysis and finite element technique, and the mechanical equivalent method is explored. The orthotropic plane stress structure is used to describe the mechanical properties of the metal mesh structure. Finally, the mathematical model of elastic performance parameter identification is established, and the equivalent elastic performance parameters of small size metal mesh are obtained. 2. The fractal mechanics analysis method of metal mesh structure is studied. Based on the parameters of small size metal mesh, the fractal mechanical analysis of metal mesh structure is studied and its fractal characteristics are revealed. Firstly, the calculation method of fractal dimension of small island and box with metal mesh structure is studied, and the fractal characteristics of metal mesh are described by using these two fractal dimensions. Then, the mechanical properties of the metal mesh structure are described by using the extended Sierpinski blanket, the stiffness matrix of the metal mesh structure is derived, the relationship between the elastic properties parameters and the size of the metal mesh is established, and the mechanical parameters of the large size metal mesh are predicted based on the structural parameters of the small size metal mesh. Finally, an example is given to verify the feasibility of the method. The statistical analysis of contact force of metal mesh on reticulated reflector is studied. From the point of view of statistics, the statistical distribution of contact force in the specified area on the reticulated reflector is studied. Taking the biased feed ring truss mesh expandable antenna as an example, according to the idea of mechanical analysis of the mesh reflector metal mesh, the interface program with strong application is compiled, and the contact force analysis software of the mesh reflector metal mesh is developed. through the graphical user interface, the distribution cloud diagram of the average contact force of the metal mesh in the designated area of the mesh reflector and the contact force of the specified contact junction are given.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN820;TN972
本文編號：2499381
[Abstract]:The problem of electromagnetic wave interference in high power passive microwave components and antennas seriously affects the design, realization and normal stability of satellite communication system. Mesh reflector antenna is one of the key equipment on mobile communication, electronic reconnaissance, data relay, microwave remote sensing and other satellites. However, the mesh braided structure used to reflect and receive signals on the antenna is one of the key nonlinear components to produce electromagnetic wave interference. The electromagnetic wave interference problem is caused by the inherent nonlinear of the reticulated reflector, which mainly includes contact nonlinear and material nonlinear. Contact nonlinear is inevitable in metal mesh structure and is the main source of interference. It is found that the contact force of metal mesh contact junction directly determines the contact nonlinear. Therefore, it is of great significance to analyze the mechanics of the reticulated reflector and obtain its contact force. In addition, the mechanical analysis method of reticular reflector studied in this paper lays a foundation for the accurate modeling of reticulated reflector and the later mechanical analysis. In order to solve the problems of complex braided structure, difficult mechanical modeling and size nonlinear effect, the fractal mechanics method of metal mesh structure is studied in this paper. the main research contents are as follows: 1. The elastic properties of small size metal mesh structure are studied. Firstly, the geometric model of metal mesh structure is established by image measurement, Spline interpolation, cross section scanning and braided element splicing, and its mechanical model is obtained, and then its mechanical properties are investigated by simulation analysis, and the orthotropic properties of reticulated reflector metal mesh structure are verified. Then, the metal mesh structure with orthotropic properties is studied by simulation analysis and finite element technique, and the mechanical equivalent method is explored. The orthotropic plane stress structure is used to describe the mechanical properties of the metal mesh structure. Finally, the mathematical model of elastic performance parameter identification is established, and the equivalent elastic performance parameters of small size metal mesh are obtained. 2. The fractal mechanics analysis method of metal mesh structure is studied. Based on the parameters of small size metal mesh, the fractal mechanical analysis of metal mesh structure is studied and its fractal characteristics are revealed. Firstly, the calculation method of fractal dimension of small island and box with metal mesh structure is studied, and the fractal characteristics of metal mesh are described by using these two fractal dimensions. Then, the mechanical properties of the metal mesh structure are described by using the extended Sierpinski blanket, the stiffness matrix of the metal mesh structure is derived, the relationship between the elastic properties parameters and the size of the metal mesh is established, and the mechanical parameters of the large size metal mesh are predicted based on the structural parameters of the small size metal mesh. Finally, an example is given to verify the feasibility of the method. The statistical analysis of contact force of metal mesh on reticulated reflector is studied. From the point of view of statistics, the statistical distribution of contact force in the specified area on the reticulated reflector is studied. Taking the biased feed ring truss mesh expandable antenna as an example, according to the idea of mechanical analysis of the mesh reflector metal mesh, the interface program with strong application is compiled, and the contact force analysis software of the mesh reflector metal mesh is developed. through the graphical user interface, the distribution cloud diagram of the average contact force of the metal mesh in the designated area of the mesh reflector and the contact force of the specified contact junction are given.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN820;TN972
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，本文編號：2499381
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