Sakharov

pp. 119-142

pp. 438-452

In this paper the authors present a comparison of various modern solvers of stiff systems of ordinary differentsial equations with C-solvers from SADEL library developed by the authors. A set of test caseswas  prepared by the authors; is consists of 6 stiff ODE systems with known analytical or asymptotic solutions. The test results are given in the article. The authors also present the basic theoretical information about the methods used in the testing of the numerical integration of systems of ordinary differential equations and considered various options of problem statement.

This article deals with BMSTU collection of centrifugal governors collected at the end of the 19th century.  It gives a brief description of governors, their distinctive features and working principles; article also provides information on the history of their creation and production.  Main problems of the governors and solutions, suggested in publications of Maxwell, Vyshnegradsky and Chebyshev, were analyzed. Wrong directions in the development of governor design were identified. These mistakes have led to the creation of invalid mechanisms, which can be found in the collection of BMSTU. The experimental determination of governor’s characteristic is described; also 3D models of several governors, created by authors, are shown.