The objectives of this research study were the comparison and evaluation of different techniques that can be used to obtain the numerical solution of equilibrium and eigenvalue problems involving thin plates. The solution of equilibrium problems is discussed first. The various techniques are broken down into two main categories. The first category includes those techniques that require trial functions satisfying the differential equations. The second category includes those techniques requiring ...
A method is proposed for determining the dynamic characteristics of automatic control systems. This method belongs to the class of methods based on termwise integration of differential equations. Results of an experimental check of the method on an MNB-1 analog computer for plants described by first- and second-order differential equations are given. (Author)
This computer study has shown that ground mobility and ride dynamics can be accurately computed by using a digital computer. The study further indicates that the accuracy of the computer analysis is dependent upon the degree of care exercised in describing the vehicle and the hard surface terrain profile to the computer. The most accurate way to describe most hard surface terrain profiles is with a table of field survey ...
This report presents an analysis and a computer program which permits determining the transient deformation of an undamped system which contains both inertial and elastic coupling by a timewise step-by-step computational process. The program is developed for the purpose of Dynamic Analysis of Shells of Revolution (DASHER). The input to the program consists of the stiffness and consistent-mass matrices which are derived from a finite-element representation of the structure. Three ...
Solutions are presented for several linear elastostatic boundary value problems pertaining to infinite bodies which contain holes or inclusions. The first two sections of the report consider planes which are loaded by normal stresses at infinity and contain a single perfectly smooth inclusion of circular or elliptic form. The third section is devoted to determination of stresses in an infinite plate having a doubly periodic rectangular array of holes which ...
Computer analysis, a direct numerical method for analyzing stress wave propagation in solid bodies, is described and applied to a group of dynamic problems. This method incorporates the governing physical laws directly into computer programs to product dynamic changes occurring in a system, thus completely bypassing the differential equations to reach the final results. Propagation schemes and sample programs are presented for problems of elastic and plastic wave propagation in ...
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