A process for determining the volume of the combustion bowl in a piston head has been developed and verified with interesting results.
Data from a Metronic G2 Laser Scanner was used to validate the performance of both the measurement system and the analysis procedure. A piston-like monument with a known volume was used to determine both accuracy and repeatability. After conducting 10 measurement trials against a known volume of 12.306 cm3, an average result of 12.300 cm3 with a standard deviation of 0.008 cm3 was obtained. The bias of 0.006 cm3 is within the standard deviation and both values are less than 0.1% of the measured value. The results of this test demonstrate that the measurement technique is both highly accurate and highly repeatable.
Metronic Systems has statistically demonstrated the accuracy and repeatability of using the G2 Laser Scanning System to measure the combustion bowl volume in a piston-like monument. The accuracy was found to be better than 0.05% of the expected value and repeatability was 0.07% of the average measured value.
These tests show that the combined data acquisition system and analysis technique have accuracy and repeatability well within manufacturing requirements.