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Articles 61 - 66 of 66
Full-Text Articles in Mechanical Engineering
Analytical Guidance Laws And Integrated Guidance/Autopilot For Homing Missiles, S. N. Balakrishnan, Donald T. Stansbery, J. H. Evers, J. R. Cloutier
Analytical Guidance Laws And Integrated Guidance/Autopilot For Homing Missiles, S. N. Balakrishnan, Donald T. Stansbery, J. H. Evers, J. R. Cloutier
Mechanical and Aerospace Engineering Faculty Research & Creative Works
An approach to integrated guidance/autopilot design is considered in this study. It consists of two parts: 1) recognizing the importance of polar coordinates to describe the end game in terms of problem description and measurement acquisition, the terminal guidance problem is formulated in terms of polar coordinates; 2a) through the use of the state transition matrix of the intercept dynamics, a closed form solution for the transverse command acceleration is obtained; and 2b) through a commonly used approximation on time-to-go and a coordinate transformation, a family of proportional navigation optimal guidance laws is obtained in a closed form. A typical …
Computer Simulation Of Three-Dimensional Mechanical Assemblies: Part Ii - Computer Simulation, T. C. Chou, Frank W. Liou
Computer Simulation Of Three-Dimensional Mechanical Assemblies: Part Ii - Computer Simulation, T. C. Chou, Frank W. Liou
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Computer simulation of the kinematic and dynamic behaviors of mechanical assemblies has become a very important tool in design and manufacturing, because the designer can foresee how a product is going to perform before the product is actually fabricated. However, up to now, the most current simulation modules are based on analysis from another kinematic or dynamic module by specifying the mating conditions between components, and then displaying the motion on the screen. This computer simulation actually performs similarly to a movie and can only provide visual checking. The drawback of this simulation approach is that designers are forced to …
On The Use Of Levy's Method For Symmetrically Laminated Composite Plates, Serge Abrate
On The Use Of Levy's Method For Symmetrically Laminated Composite Plates, Serge Abrate
Mechanical and Aerospace Engineering Faculty Research & Creative Works
For rectangular plates with two opposite edges simply supported and no bending twisting coupling, Levy's method can yield exact solutions for static deflections, free vibrations and buckling loads. However, three distinct solutions are obtained, depending on the relative magnitude of the plate rigidities, which in turn are functions of material properties, laminate thickness and lay-up. In this communication a stiffness invariant formulation is used to identify those laminates which fall under the three cases defined. © 1993.
Second Law Analysis Of Active Magnetic Regenerative Hydrogen Liquefiers, L. Zhang, S. A. Sherif, T. N. Veziroglu, John W. Sheffield
Second Law Analysis Of Active Magnetic Regenerative Hydrogen Liquefiers, L. Zhang, S. A. Sherif, T. N. Veziroglu, John W. Sheffield
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Recent published work in the area of magnetic refrigeration reports on its potential for greater efficiency and high reliability. This paper presents an exergy analysis of a three-stage active magnetic regenerative (AMR) hydrogen liquefier which cools a hydrogen gas stream at 77 K and 1 atm to hydrogen liquid at 20 K. Ortho - para conversion of hydrogen is accomplished in a heat exchanger employing a 10 atm helium fluid that cycles in the refrigerator. The performance of the system is described in terms of the cooling capacity and exergy losses as functions of the magnetic material type, magnetic bed …
Observations On Higher-Order Beam Theory, A. Bhimaraddi, K. Chandrashekhara
Observations On Higher-Order Beam Theory, A. Bhimaraddi, K. Chandrashekhara
Mechanical and Aerospace Engineering Faculty Research & Creative Works
A parabolic shear-deformation beam theory assuming a higher-order variation for axial displacement has been recently presented. In this theory, the axial displacement variation can be selected so that it results in a suitable admissible transverse shear-strain variation across the depth of the beam. This paper examines several transverse shear-strain variations that can go with the aforementioned higher-order theory. Apart from the usual simple parabolic variation, six other shear-strain variations are considered: the sinusoidal variation, cubic, quartic, quintic, and sixth-order polynomials. All these variations for transverse shear-strain satisfy the requirement that the shear strain be zero at the extreme fibers (z …
Procase: A Prototype Of Intelligent Case-Based Process Planning System With Simulation Environment, Hao Yang, Wen F. Lu
Procase: A Prototype Of Intelligent Case-Based Process Planning System With Simulation Environment, Hao Yang, Wen F. Lu
Mechanical and Aerospace Engineering Faculty Research & Creative Works
An intelligent case-based process planning system with interactive graphic simulation environment, PROCASE, is developed lo demonstrate an integrated methodology of case-based process planning system. In PROCASE, both the mechanical part features and the machining operations are represented with a frame-based scheme. PROCASE contains a retriever, a modifier, a simulator and a repairer. It distinguishes itself from traditional rule-based process planning systems by representing the process planning knowledge through previous process planning cases instead of production rules. It therefore can overcome some problems in the traditional rule-based expert systems. PROCASE currently resides in IRIS Indigo workstation. With a user-friendly graphic environment, …