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A practical course in the fundamentals of machinery diagnostics for anyone who works with rotating machinery, from operator to manager, from design engineer to machinery diagnostician. This comprehensive book thoroughly explains and demystifies important concepts needed for effective machinery malfunction diagnosis: (A) Vibration fundamentals: vibration, phase, and vibration vectors. (B) Data plots: timebase, average shaft centerline, polar, Bode, APHT, spectrum, trend XY, and the orbit. (C) Rotor dynamics: the rotor model, dynamic stiffness, modes of vibration, anisotropic (asymmetric) stiffness, stability analysis, torsional and axial vibration, and basic balancing. Modern root locus methods (pioneered by Walter R. Evans) are used throughout this book. (D) Malfunctions: unbalance, rotor bow, high radial loads, misalignment, rub and looseness, fluid-induced instability, and shaft cracks. Hundreds of full-color illustrations explain key concepts, and several detailed case studies show how these concepts were used to solve real machinery problems. A comprehensive glossary of diagnostic terms is included.
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The modern presidency has become the central fault line of polarization in America because the president, increasingly, has the power to reshape vast swaths of American life. In The Cult of the Presidency, Gene Healy argues that “We, the People” are to blame. Americans on each side of the red-blue divide demand a president who can create jobs, teach our children well, tend to the “national soul”—and vanquish their culture-war enemies. Our political culture has invested the office with preposterously vast responsibilities, and as a result, the officeholder wields powers that no human being ought to have. In a new preface to the 2024 edition, Healy argues that the rise of partisan ha...