Showing papers by "J. N. Reddy published in 1973"
TL;DR: An approximate method for computing consistent stresses in finite elements is presented, based on the idea of consistent stress approximations and it approximates such stresses using the notion of a domain of influence of the stress intensity at a nodal point.
Abstract: SUMMARY A technique is described wherein improved stresses can be computed in finite clement models based on displace- ment approximations. The method is based on the idea of consistent stress approximations and it approximates such stresses using the notion of a domain of influence of the stress intensity at a nodal point. Considerable improvement in accuracy of the stresses is obtained with little difficulty. The calculation of so-called 'consistent' or 'conjugate' approximations of stresses in displacement finite element formulations involves, in addition to the usual computations, the solution of an auxiliary system of linear equations, the order of which is comparable to that of the stiffness matrix itselp-
50 citations
01 Jan 1973
TL;DR: In this paper, convergence and general properties of mixed finite element models of a general class of boundary-value problems of the type Au + ku + f = 0, u belongs to R, and B(u - g) = 0 on boundary (R sup 1), B*(Tu - s) = 1 on boundary(R sup 2) are considered.
Abstract: : Convergence and general properties of mixed finite element models of a general class of boundary-value problems of the type Au + ku + f = 0, u belongs to R, and B(u - g) = 0 on boundary (R sup 1), B*(Tu - s) = 0 on boundary (R sup 2) are considered here where u = u(x) is a function defined on a bounded region R of (E sup n), boundary R is the smooth boundary of R, x is a point in R, A is a linear factorable operator, k is a positive constant, and B and B* are operators describing mixed boundary conditions on boundary R. (Author)
14 citations
Patent•
26 Sep 1973TL;DR: An electronic fuel control system of the type providing metered quantities of fuel to a power producing engine in response to accurately timed electrical pulses includes circuit means for overcoming oscillations in the pulses due to a reduction in system supply voltage occurring, for example, during engine cranking as mentioned in this paper.
Abstract: An electronic fuel control system of the type providing metered quantities of fuel to a power producing engine in response to accurately timed electrical pulses includes circuit means for overcoming oscillations in the pulses due to a reduction in system supply voltage occurring, for example, during engine cranking. The circuit means senses when the supply voltage is below a predetermined level and thereupon is operative to eliminate the oscillations without interfering with normal system operation.
5 citations