Showing papers in "Journal of Basic Engineering in 1969"
111 citations
TL;DR: In outline, the scheme touches on all the time or frequency domains in life—that is, of the many episodes in man—and may be extended to man’s behavioral complex.
Abstract: A scheme is outlined for a useful way to think about the complex biological organism, man. It is based on physiological findings that the regulating and control functions in the system make use of active processes, exhibiting oscillatory properties [1]. The resulting homeostatic regulation, which was the key concept proposed by Bernard, Sechenov, and Cannon for the living system [2], emerges from mediation of these oscillators. Because of its dynamic character, the scheme is renamed homeokinesis [3]. The concept may be extended to man’s behavioral complex. In outline, it touches on all the time or frequency domains in life—that is, of the many episodes in man.
89 citations
TL;DR: In this article, the authors determined the crack propagation rate in 7075-T6 tension plates for central cracks initially oriented in 45 degrees, 60 degrees, and 90 degrees, to the width direction of the tension plates which were loaded cyclically.
Abstract: : Crack propagation rate in 7075-T6 tension plates was determined for central cracks initially oriented in 45 degrees, 60 degrees, and 90 degrees, to the width direction of the tension plates which were loaded cyclically. Opening and sliding mode of stress intensity factors, K sub 1 and K sub 2, were determined by the method of direct stiffness for curved cracks generated from these initially slanted cracks. Crack propagation rates, Delta a/Delta N, were then plotted against the maximum opening mode of stress intensity factor, K sub 1, in the presence of sliding mode of stress intensity factor, K sub 2. Comparison between the corresponding crack propagation rate in control specimens without K sub 2 showed that the propagation rate is definitely increased in the presence of K sub 2. (Author)
82 citations
TL;DR: Analytical measure of quality of controllability for linear dynamic system and computational procedure for maximizing adjustable structural parameters.
Abstract: Analytical measure of quality of controllability for linear dynamic system and computational procedure for maximizing adjustable structural parameters
75 citations
65 citations
59 citations
56 citations
46 citations
TL;DR: In this article, the authors proposed a solution for low Reynolds number turbulent gas flow based on Reynolds number dependent velocity profile, and solved the thermal entry problem for turbulent gas flows based on the velocity profile.
Abstract: Thermal entry problem solution for low Reynolds number turbulent gas flow based on Reynolds number dependent velocity profile
44 citations
43 citations
TL;DR: In this paper, a solution for a general nonlinear interpolation problem using a least-squares criterion for estimation, along with invariant imbedding techniques, is presented, where the problem is shown to be equivalent to a two-point boundary-value problem.
Abstract: : The study shows how a sequential solution can be obtained for a fairly general nonlinear interpolation problem using a least-squares criterion for estimation, along with invariant imbedding techniques. The equations of the sequential interpolating filter are obtained by first showing the interpolation problem to be equivalent to a two-point boundary-value problem. The two-point boundary-value problem is then converted to an initial-value problem by means of invariant imbedding, and the initial-value problem leads directly to a sequential filter. To avoid unnecessary matrix manipulations, the formulation and solution are given for the scalar case only. Generalization to the vector case is straightforward. (Author)
TL;DR: In this paper, the performance of pressure-exchanger dividers and equalizers using air as the working fluid was investigated. And the effects of varying rotor speed, port geometry, and port pressure ratios were explored.
Abstract: Tests are reported which were carried out to establish the performance of pressure-exchanger dividers and equalizers using air as the working fluid. The effects of varying rotor speed, port geometry, and port pressure ratios were explored. It was concluded that, at low pressure ratios, pressure-exchanger dividers and equalizers are comparable in performance with their turbomachine counterparts.
TL;DR: In this article, a fracture criterion was developed from the Sih-Hartranft bending theory, which, when modified to account for precatastrophic crack extension, agreed well with the experiments in regions where the crack remained open at fracture.
Abstract: Experiments were performed on cracked plates loaded in combined extension and approximately cylindrical bending. A fracture criterion was developed from the Sih-Hartranft bending theory, which, when modified to account for precatastrophic crack extension, agreed well with the experiments in regions where the crack remained open at fracture and appeared to provide a lower bound in the region where crack closure occurred.
TL;DR: In this article, the authors used linear methods with distributed-parameter pipe representation to analyze the dynamics of a rocket engines propellant feed system dynamics using linear methods and linear methods.
Abstract: Rocket engines propellant feed systems dynamics analyzed by model using linear methods with distributed-parameter pipe representation