Topic
Critical speed
About: Critical speed is a research topic. Over the lifetime, 2764 publications have been published within this topic receiving 31365 citations.
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17 citations
01 Jan 1984
TL;DR: In this paper, the design analysis of a very thin, highly swept, propeller blade to be used in the Large-Scale Advanced Prop-Fan (LAP) test program is described.
Abstract: This report covers the design analysis of a very thin, highly swept, propeller blade to be used in the Large-Scale Advanced Prop-Fan (LAP) test program. The report includes: design requirements and goals, a description of the blade configuration which meets requirements, a description of the analytical methods utilized/developed to demonstrate compliance with the requirements, and the results of these analyses. The methods described include: finite element modeling, predicted aerodynamic loads and their application to the blade, steady state and vibratory response analyses, blade resonant frequencies and mode shapes, bird impact analysis, and predictions of stalled and unstalled flutter phenomena. Summarized results include deflections, retention loads, stress/strength comparisons, foreign object damage resistance, resonant frequencies and critical speed margins, resonant vibratory mode shapes, calculated boundaries of stalled and unstalled flutter, and aerodynamic and acoustic performance calculations.
17 citations
11 Jun 1958
TL;DR: In this paper, it was shown that for a given mode of whirling, triple valued solutions are obtained for speeds of rotation above the linear critical speed for that mode, and that two of these solutions are stable while the third is unstable.
Abstract: Approximate solutions are obtained for the non-linear problem of the forced whirling of a heavy chain. It is shown that for a given mode of whirling, triple valued solutions are obtained for speeds of rotation above the linear critical speed for that mode. It is also shown that two of these solutions are stable while the third is unstable.
17 citations
TL;DR: In this article, the conditions of correct increment extraction from a falling stream of particulate material are investigated and the results of the analysis and interpretation of the test results are provided. But the results are limited to the case where the sample must be unbiased and the sample size must be smaller than or equal to the critical width.
17 citations
TL;DR: In this article, a discussion of the problems associated with balancing bent, flexible shafts is presented, and the results of a series of very successful balancing tests are presented for a long flexible shaft which demonstrate the effects of initial bend at speeds up to and beyond the fourth critical speed.
Abstract: The synchronous whirl of a rotating, flexible shaft induced by an initial bend is similar, though slightly different, than that induced by a pure mass unbalance. The differences are due to differences in the forcing effects produced by these phenomena. A discussion of the problems associated with balancing bent, flexible shafts is presented. Experimental results are reported for a long, flexible shaft which demonstrate the effects of initial bend at speeds up to and beyond the fourth critical speed. Included are the results of a series of very successful balancing tests.
17 citations