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A simulation model has been developed to estimate belt load by replacing the L/O (layout) around the engine synchronous drive belt and cam pulley with a simple vibration model based on the spring-mass system. Different engine specifications were applied to compare belt load estimates made by this model with the load actually measured, and found that the estimates matched the measurement values precisely. This report describes the specifications of our simulation model and the results of verification.

In order to improve adaptability of the laser Doppler anemometer (LDA) to measurement of gas flow velocities in an internal combustion engine, an optical fiber system composed of a couple of single mode, polarization-preserving optical fibers has been developed to transmit the incident beams. The overall light transmission efficiency of the system is 24 % and not so high, but the system enables real-time measurements of gas flow velocity in the combustion chamber of a small two-cycle engine during firing operation. The velocity data measured are processed with cycle by cycle analysis by stationary time-averaged method to obtain bulk velocity Ū, turbulence intensity u′ and integral time scale of turbulence Lt.