The Simulation and Experiment Research on the Influence of Crankshaft Flexible Torsion to Diesel Instantaneous Speed

Abstract:

The flexible crankshaft may influence diesel’s instantaneous speed when diesel runs at high speed and load. In this paper the nine-degree crankshaft dynamic model is set up aim at 6-135 type diesels, and studies the instantaneous speed fluctuating rules at different position of crankshaft. The Simulating outcome shows that the obvious difference and rules are exist in instantaneous speed of all degrees: The instantaneous speed waveform corresponding to each cylinder accomplishes a change of several small wave crests to one beg crest gradually from freedom end to flywheel end. At last the simulating outcome are compared to experimental measured instantaneous speed of freedom end and flywheel end, they are in agreement at both wave shape and frequency spectrum sides, then the model’s effect is proved.

• Periodical: Applied Mechanics and Materials (Volumes 651-653)
• Pages: 924-927
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.651-653.924
• Online since: September 2014
• Authors: Yun Ling Sun*, Hong Xiang Tian, Lin Li
• Keywords: Diesel, Instantaneous Speed, Multi-Degrees, Simulation Model

References

[1] Wang Y, Chu F. Real time misfire detection via sliding mode observer. Mechanical Systems and Signal Processing, Vol. 19 (2005): 9002912.

DOI: 10.1016/j.ymssp.2004.07.004

[2] MA Jin, JIANG Zhi-nong, GAO Jin-ji. Diesel engine fault diagnosis method based on instantaneous angular speed fluctuation ratio. Journal of vibration and shock, Vol. 31 (2012), p.119.

[3] Li Lin, Zhang Yong-xiang. Indicated torque estimation based on instantaneous speed and armax model[J]. Journal of vibration and shock, (2012), p.95.

[4] William J. Swanson. Determination of Diesel Engine Cylinder Gas Torques from Speed Fluctuations with a High-Fidelity Crankshaft Tensional Model. Master's degree dissertation paper of United States Navy B.S., California Institute of Technology (1998).

[5] Sun Yun-ling, Piao Jia-zhe, Zhang Yong-xiang. Investigation on interpolation method in transient speed measurement for internal combustion engines. Transactions of CSICE, (2002), p.335.