Fault Detection of Inline Reciprocating Diesel Engine: A Mass and Gas-Torque Approach

Table 2

Natural frequency of whole system = 1148 vpm.

	Mass no.	Moment of inertia; 𝐽	Torque per unit deflection; 𝐽𝜔^2	Deflection in plane of mass; 𝜃	Torque in plane of mass; 𝐽𝜔^2𝜃	Total torque; Σ𝐽𝜔^2𝜃	Shaft stiffness; 𝐶	Change in deflection; Δ𝜃
		Kg m^2	MN m	±rad	MN m	MN m	MN m/rad	rad
Pulley	1	0.094	0.1238829	1	0.123882976	0.123882976	0.391	0.31683626
Cyl.1	2	0.075	0.0988428	0.683163744	0.067525817	0.191408793	1.952	0.09805778
Cyl.2	3	0.075	0.0988428	0.585105961	0.057833511	0.249242305	1.952	0.12768561
Cyl.3	4	0.075	0.0988428	0.457420354	0.045212709	0.294455013	1.952	0.15084786
Cyl.4	5	0.075	0.0988428	0.306572499	0.030302484	0.324757498	1.952	0.16637167
Cyl.5	6	0.075	0.0988428	0.14020083	0.013857843	0.33861534	1.952	0.17347097
Cyl.6	7	0.075	0.0988428	−0.03327014	−0.00328851	0.335326826	3.52	0.0952633
Flywheel	8	1.97	2.5962708	−0.12853344	−0.33370764	0.001619182
	𝐹=1148 vpm (vibration per min.)