Vibrodynamic parameters of radial piston engines with Pencake mechanism

Abstract

Introduction (problem statement and relevance). The development of calculation methods at the design stage of the balance and vibration activity of multipurpose converting mechanisms of engines differing in the classical crank mechanism is actual.The purpose of the work was to substantiate such a technique for a FSUE “NAMI” three-cylinder radial engine with a Pencake conversion mechanism designed to drive electric generators.Methodology and research methods. To solve the problem, both classical methods of piston engine dynamics and modern methods based on solid modeling and simulation of forced motion were used. Scientific novelty and results. It was found that in the investigated engines a complete balance of the inertial forces of the first-order translational masses and centrifugal forces could be achieved with the help of two counterweights on the crankshaft. The vibration levels of three-cylinder radial and in-line engines assembled from the same links have been compared and the noticeable advantages of the radial star-shaped engine were marked both in terms of the root-mean-square values of vibration velocity and in its spectral vibration.Practical significance. The results of the work can be used in practical development.