تعداد پست ها:6 • صفحه 1 از 1
Several graphic methods for both analyzing and designing centrifugal governors were developed during the last two decades of the 19th century. The best known and most effective approach  was published in 1895 by the German professor Max Ch. Tolle (1864–1945). From construction details of the governor, he calculated two components of the centrifugal force: Cg and Cq.Cg results solely from the mass M of the flyballs; Cq results from Q; that is from the weight of all other masses in the system and from the force of a spring (if there is one) (see Fig. 6). Tolle plotted both these components and their sum as functions of the flyball's distance from the axis of rotation and called this graph C-curves. Thus, the shape of these curves characterized the behavior of the governor. At a certain rotating speed, the centrifugal force C of the flyballs, which is proportional to the distance x, must balance the C-curve (Cg+Cq). Thus, it became obvious whether or not a governor was stable, static, or nonstatic. Rather complicated graphs based on such curves enabled the user to investigate and influence the dynamics of the governor. Remarkably, inertia, friction, and damping effects could be taken into account, and even time series graphs could be constructed. The approach was also published in Tolle's book ( and two subsequent editions), which was one of the first textbooks on speed control of driving engines with emphasis on hydro turbines. In this book, Tolle applied his method to a great number of governors and, based on the results, compared them critically. Tolle's method was used for 20 years or more.
نام: محمّد جوانشیری
محل اقامت: تهران
عضویت : پنجشنبه ۱۳۹۰/۹/۲۴ - ۱۱:۴۹