This torsional excitation for a gas or diesel engine is entered in this tab. If a cylinder is misfired, then the gas torque is removed from that cylinder and only the inertia torque is retained. Although the inertia torque in general is very small compared with the gas torque. However, if the cylinder rotor station is negative or zero, which indicates that this particular cylinder is not contributing to any torsional excitation. That is this particular cylinder is removed from the system totally.
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