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A Method for Measuring the Excitation Forces Inside Engines

Article of Honda R&D Technical Review Vol.13 No.1


This paper presents a method for directly measuring the excitation forces exerted on the main bearing journal from the crankshaft. A method was developed for obtaining the amplitude and direction of the constantly changing excitation forces, which had not previously been accomplished. The excitation force direction and absolute value are obtained when the relative error between the strain during actual operation obtained from multiple strain gauges affixed to the inner surface of the main bearing journal and the strain estimated from calibration curves is at a minimum.


(1) C. Yasuda, P.J. Riehle, D. L. Brown, R.J. Allenmang: An Estimation Method for Rotational Degrees of Freedom Using a Mass Additive Technique. 2nd IMAC, p. 877–886 (1984)
(2) Conway Jones J.M., Jones G.J.: Crankshaft bearings: Advances in Predictive Techniques and Measurements in Engines, ASME Paper 84-DGP-4, p.12 (1984)
(3) B. Hillary, D.J. Ewins: The Use of Strain Ggauges in Force Determination and Frequency Response Function Measurements 2nd. IMAC, p. 627–634 (1985)
(4) A. Matsuda, Y. Hayashi, J. Hasegawa: Vibration Analysis of a Diesel Engine at Cranking and Idling Modes and Its Mounting System, SAE Paper 870964.
(5) Paranjpe R.S.,: A Study of Dynamically Loaded Engine Bearings Using a Transient Thermohydrodynamic Analysis Tribol. Trans., Vol.39, No.3, p. 636–644 (1996).

Author (organization or company)

Toshifumi SUZUKI(Tochigi R&D Center)、Naoki KAMIMURA(Tochigi R&D Center)、Yukitaka TAKAHASHI(Tochigi R&D Center)

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