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Navigation of Autonomous Mobile Robots
An integrated navigational system for autonomous mobile robots features a primary navigator, such as an inertial navigation or a dead-reckoning system, and a secondary navigator. The secondary...

Developing Plans for Robotic Excavators
We would like a robot excavator that is able to excavate a volume of soil according to specification. To this end we have developed a general method that can be used to provide prescriptions...

Inertially Favorable Trajectories for Robot Motion in Space
Robot manipulators generally display non-linear coupled dynamic forces which increase with speed. Efficiencies can be achieved by finding trajectories which take advantage of those inertial...

Improving Dynamic Finite Element Models Using Test Data
A structural optimization based method was developed to improve the finite element model to achieve good agreement with the test results. The modal displacements at critical locations...

Dynamic Analysis of a High Speed Transport Model by Using a Piecewise Continuous Timoshenko Beam Model
Conventional treatment of structural dynamic analysis and control is based on the finite element structural model. But such a treatment uses a very large number of elements which is usually...

Braced Double Skinned Structure in Lunar Application
A parametric study is designed to evaluate a proposed Braced Double Skinned roof structure utilizing extrapolated theoretical solutions i.e. Navier's solution and Levy's solution. A Finite...

Comparison of Donnell and Higher Order Nonlinear Models for Dynamically Loaded Composite Plates and Shells
The dynamic buckling behavior of composite cylindrical shells subjected to a transverse point load is considered. The behavior of undamped cylindrical shells of varying radii is analyzed...

Large Deformation Theory Using Truncated Rotations
Today's aerospace industry has advanced to the point of using optimum design techniques in virtually all applications. In structural elements, orthotropic fiber composite materials have...

Analysis of Composite Panels Using Newton's Method
Postbuckling response prediction of composite panels using Newton's method will be discussed. The traditional approach of nonlinear finite element analysis is to use a Newton-Raphson approach...

Allowable Design Loads for Marman Clamp Systems
Marman clamp separation systems have many aerospace applications. One of their most important applications is in the attachment of spacecraft to expendable launch vehicles. Because their...

Inelastic Response of Metal Matrix Composite Tubes
An analytical method which exactly satisfies the equations of the boundary value problem for the inelastic response of laminated metal matrix composite tubes on a point-wise basis is presented....

Late Stage Damage in G30-500/PMR-15 Laminates
Damage progression has been studied experimentally under tension using [0₂/90₆]_s...

Thermal Stresses in Piezoelectric Materials: A Boundary Integral Formulation
With the increasing use of piezoelectric materials in electromechanical devices which are often required to function in thermally hostile environment, thermal stresses and their influence...

Convergence Rates of the Method of Successive Elastic Solutions in Thermoplastic Problems of a Layered Concentric Cylinder
This paper examines convergence rates of the method of successive elastic solutions, proposed by Mendelson, in determining the thermoplastic response of an arbitrarily layered concentric...

Implementation of a Viscoplastic, Kinematic Hardening Constitutive Model for Impact Prediction
This paper reports on a preliminary study to determine the significance of the Bauschinger effect on modeling impact and other large deformation events. Such events have significant implications...

Methodology for Comparing Lunar Settlement Designs
This paper examines a methodology used to compare divergent lunar settlement proposals. It is suggested that the methodology be added to other selection tools for determining which is...

Transferring Construction Technology to the Moon and Back
This paper examines past NASA contributions to the construction industry, analyzes the challenges ahead for space-based construction, cites examples of new technologies currently used...

Lunar Base Construction Using the Reinforce Earth Method with Geotextile
This paper focuses on the construction of layered embankments using regolith and filmy materials (called geotextiles) with a robot machine before setting up of the cylindrical module on...

Space Commercialization: Problems of Law and Policy
This paper focuses on executive and legislative efforts to promote the growth of commercial space industries in the United States. After a discussion of the current, situation and efforts...

Effective Project Planning Techniques
Setting tabular and graphic standards for the presentation, storage and handling of project-related data from the start can make the job of managing, scheduling and documenting a project...

 

 

 

 

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