Patent ID: 7866147

Claim:
A method of damping pulsations associated with operation of a two-stroke stationary gas compression engine having a scavenging phase, the engine having exhaust runners that carry exhaust from cylinders to an exhaust manifold, the exhaust manifold being generally cylindrical and having two ends and side walls such that the runners deliver exhaust into side walls, comprising: determining a resonant pulsation frequency associated with the engine during the scavenging phase, by measuring exhaust back pressure in at least one runner as a function of crank angle; using the resonant pulsation frequency to determine the volume depth for a side branch absorber to dampen pulsations and to be attached to one end of the manifold, the volume being generally cylindrical and having a diameter generally the same as the diameter of the manifold; using the resonant pulsation frequency to determine the choke tube dimensions for the side branch absorber; and attaching the side branch absorber to the one end of the manifold, such that the choke tube provides the only fluid communication between the manifold and the volume.