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测边网和边角网平差用力学方法是一种比较新颖的方法。在力学方法中,将测边网比作形状相同的桁架,边长改正数比作桁架杆件的变形。求解杆件变形用最小势能原理,计算边长改正数用最小二乘法原理,两者的数学模型是相同的,因此力学方法平差是一种严格的平差方法。在力学方法中,用了虚功原理,本文叙述虚功原理在测边网和边角网平差中的应用。本方法自成体系,图象清晰、概念明确,计算工作量小、有可靠的校核、能在复杂的条件下使用是本方法的优点。
The mechanics of adjustment of edge-measurement nets and corner nets is a relatively novel method. In mechanical methods, the side mesh is compared to a truss of the same shape, and the side length correction is compared to the deformation of the truss member. The principle of least potential energy is used to solve the deformation of rods. The principle of least squares is used to calculate the length corrections. The mathematical model of the two is the same. Therefore, the adjustment of mechanical methods is a strict adjustment method. In the method of mechanics, the principle of virtual work is used. This paper describes the application of the principle of virtual work in the adjustment of side-edge and side-edge networks. This method is self-contained, with clear images, clear concepts, low computational workload, reliable verification, and ability to use under complex conditions are advantages of this method.