Showing papers by "Velagapudi Ramakrishna Siddhartha Engineering College published in 1989"
TL;DR: In this article, a singular perturbation method is developed to obtain approximate solutions composed of an outer series, two initial correction series and two final correction series to recover the lost boundary conditions in the process of degeneration.
Abstract: The open-loop optimal control of a linear, shift-invariant, singularly perturbed system with two small parameters is considered. The two small parameters are interrelated and approach zero simultaneously. The resulting two-point boundary value problem is put in the singularly perturbed form. A singular perturbation method is developed to obtain approximate solutions composed of an outer series, two initial correction series and two final correction series to recover the lost boundary conditions in the process of degeneration. An example is provided to illustrate the proposed method.
9 citations
22 May 1989
TL;DR: In this article, the authors present a method for the analytical evaluation of the radiation patterns of a TACAN (tactical air navigation) antenna, based on image theory, using a single lobe caused by the inner parasitic and nine lobes arising due to the outer parasitics together effectively enable coarse and fine bearing measurements.
Abstract: The authors present a method for the analytical evaluation of the radiation patterns of a TACAN (tactical air navigation) antenna, based on image theory. The discone antenna utilized in TACAN gives an omni pattern in the horizontal plane. A single lobe caused by the inner parasitic and nine lobes arising due to the outer parasitics together effectively enable coarse and fine bearing measurements. Since the inner and outer parasitics are both rotated at 15 rev/s, the nine-lobed pattern rotates in space at a 15-Hz rate. >
5 citations
TL;DR: In this article, the quality of motion transmission of a chain is measured by the flow value of a single-degree and multi-degree-of-freedom mechanism, and it is shown that flow value can be used as a measure of the flow quality.
Abstract: The prediction of dimensional behaviour of a chain in the sense of structural error has been reported [22-23], Once the selection of a chain is made it remains to see which of the links should be grounded and which of the links should be selected for input and output for the specified task e.g., path generation, function generation. Criteria to judge the quality of motion transmission are proposed. All the distinct inversions of a chain can be examined for the specified task so that the best combination can be chosen. The same is explained with examples of single-degree and multi degree-of-freedom mechanisms, and it is shown that the flow value of a mechanism can be used as a measure of the quality of motion transmission.
4 citations