ディーゼル機関のねじり振動減衰特性に関する研究 : (第2報: 実機試験の測定結果)

概要

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The engine damping ratios obtained by the experiments for both high-speed and low-speed diesel engines have been analyzed by using the non-dimensional damping functions defined in the previous paper. The obtained results are as follows: 1) For high-speed diesel engines, friction damping is dominant in engine damping and for low-speed diesel engines, it is comparable to hysteresis damping. 2) The non-dimensional function φ1 (cr, D) for high-speed diesel engines is approximately expressed by the following equation. φ1 (cr, D) =0.105R-2.8 (1.5<R<4) where, R ; ratio of inertia moment of flywheel IF to the sum of inertia moments of each cylinder mass IE . The above equation means that the value of φ1 (cr, D) decreases exponentially with increase of natural frequency ωn. 3) The value of φ1 (cr, D) for low-speed diesel engines is very small in comparison with that in high-speed diesel engines, and changes only slightly in accordance with the variation of mass ratio R. 4) The value of ψ2 (n, p) is almost independent of mass ratio R. As the values of damping ratio due to hysteresis damping, which have been obtained by the experiments for both high-speed and low-speed diesel engines, are approximately 0.002, it can be said that damping ratio due to hysteresis damping ζh is nearly constant. This fact confirms the results of the analysis carried out in the previous paper.
社団法人日本マリンエンジニアリング学会の論文