Dimensionless relationships that estimate the maximum bearing load of two symmetric in-line engines have been developed. These relationships were empirically determined by averaging the maximum bearing loads of several engine configurations with various geometric and operating parameters. It has been found that the maximum bearing load initially decreases with engine speed, reaches a minimum, and then increases quickly with engine speed. This minimum reflects a transition speed at which the contribution of the inertia force overcomes the contribution of the maximum pressure force to the maximum bearing load. The transition speed increases with an increase of counterweight mass and is a function of the geometric parameters and operating conditions of the engine. Rapid estimation of the main bearing loads is made possible by the use of the dimensionless relationships developed in the paper.
A Characteristic Parameter to Estimate the Optimum Counterweight Mass of Symmetric In-Line Engines
Contributed by the Internal Combustion Engine Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received by the ICE Division, May 2001; final revision received by the ASME Headquarters, March 2002. Editor: D. N. Assanis.
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Stanley, R., and Taraza, D. (August 11, 2004). "A Characteristic Parameter to Estimate the Optimum Counterweight Mass of Symmetric In-Line Engines ." ASME. J. Eng. Gas Turbines Power. July 2004; 126(3): 645–655. https://doi.org/10.1115/1.1559902
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