空間可展開索網(wǎng)天線的機(jī)構(gòu)構(gòu)型綜合與形面設(shè)計方法研究
[Abstract]:Space deployable cable network antenna is one of the key equipment of satellite communication, environment detection, manned space and lunar month engineering. In order to realize the design of large aperture, light quality and high precision, this paper systematically studies the general mechanism degree of freedom analysis and configuration synthesis problem of supporting frame, and puts forward the geometric design, pre-tensioning force design of cable net structure and design method of uncertain cable net. The main work and innovation points are as follows: (1) The degree of freedom of the generalized mechanism is analyzed. the generalized mechanism comprises a traditional rigid component and a moving pair, and also comprises a generalized component such as a flexible component, a spring and a rope, and a generalized motion pair such as a pre-tightening moving pair, a pre-tightening rotating pair and the like. Based on the theory of helix, the constrained space of the motion space and the generalized motion pair of the generalized component is analyzed, and the maximum/ minimum degree of freedom and the maximum/ minimum constraint degree of the generalized motion pair are obtained. Considering the common constraints, redundancy constraints and local degrees of freedom, three formulas for calculating the degree of freedom of the generalized mechanism are established. The results show that the degree of freedom of the generalized mechanism does not necessarily have a unique value, but falls within the interval between the minimum and the maximum degree of freedom, and the specific value of the degree of freedom is related to the structure, the geometry and the magnitude and direction of the external force (moment). (2) The generalized mechanism configuration inverse motion synthesis method is proposed. The motion type of the output member is obtained by combining the description of the generalized component and the generalized motion pair through the spiral, and the kinematics characteristic analysis method of the generalized mechanism is established by combining the motion type of the output member. In turn, the inverse motion synthesis method of generalized mechanism configuration is established by reverse expansion of the kinematic analysis method. according to the specified motion type, performing reciprocal operation on the rotation quantity to obtain a constrained spiral system for outputting motion, further decomposing and reciprocal obtaining the moving spiral system of the branched chain of the generalized mechanism, obtaining the corresponding generalized component and the generalized motion pair set, forming the motion branched chain of the generalized mechanism, finally, a generalized mechanism configuration meeting the specified motion function is obtained through the combination of the chains of the moving branched chains. (3) A method for generating ground lead network of deployable antenna is proposed. Based on the theory of differential geometry geodesy, the measured curvature of the curve on the rotating paraboloid is analyzed, and the general geodynamic differential equation set of arbitrary two points on the curved surface is derived, and the numerical solution method of the equations is formed by combining the relaxation method and the Newton iteration method. In order to make the geosynchronous line on the parabolic curve to generate the geodetic clue net in mathematical sense according to the specified topological connection relation, the optimization model of the boundary node adjustment is established, and the dynamic boundary adjusting method of the geometric design of the ground thread net structure is formed. Compared with other cable net structures, the length of the wire net structure is short and the effective area is large. (4) Plane projection method and isotonic force design method of cable net pre-tensioning force design are studied. In this paper, the plane projection method of the pre-tensioning force design is studied for the parabolic surface cable net structure known by geometric coordinates. firstly, projecting it onto a caliber plane, establishing a pre-tensioning force optimization model of the plane cable net, calculating the plane tension distribution and reversely projecting the plane tension force to the parabolic curved surface to obtain the tension force of the parabolic curved surface cable net structure, and improving the pre-tension calculation efficiency of the cable net. For the cable net structure with unknown geometry and tension force, the isotension design method of cable net structure is put forward. Based on the fixed point theory for solving the nonlinear equations, the cable network tension is set to the same value, the force density is used as the iteration variable, and the iterative mathematical model of equal tensioning force is established according to the coupling relation between the cable net force density, the cable length and the tension force. The results show that the pre-tension force of the wire net structure can be calculated by the planar projection method, which can obtain better force uniformity and higher surface accuracy, while the isotonic force method can realize the full equality of the tension force inside the partial cable net. (5) Considering the uncertainty factors, the pre-tension design of the cable net is studied. By analyzing the influence of uncertain factors such as structure, material and environment on the tension force of cable net, the uncertainty factor is equivalent to the uncertainty of cable net tension. For the cable net structure known by the geometric coordinates, an anti-optimization strategy is introduced, and a tension optimization model of the uncertain cable net structure is established, and a cable net pre-tensioning force with minimal impact on the shape surface accuracy is obtained. For the cable net structure with unknown geometry and tension force, the concept of interval force density is put forward, the expression of the shape surface precision interval of uncertain cable net structure is deduced, and the interval force density optimization model of uncertain cable net structure is established. and the influence of the uncertainty factors on the accuracy of the cable net-shaped surface is effectively reduced.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2016
【分類號】:TN820
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