Abstract
An efficient method has been developed to accurately and efficiently predict the sensitivities of an internal combustion engine's steady-state outputs to dimensional tolerances. The alternating frequency/time (AFT) domain technique is used to determine the steady state response (mean crank speed, mean driving torque and Fourier coefficients of temporal variations in crank's speed and driving torque) of an engine, which is governed by a nonlinear differential equation with discontinuous forcing function due to the nature of the pressure-volume (P-V) diagram. The validity of this method has been established by comparison with the results from numerical integration of the differential equation of motion. This technique, by virtue of being computationally efficient, is well suited for the development of an optimal tolerance allocation scheme based on nonlinear programming.
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