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“Super Stirling Engine” is a Stirling engine assisted by saturated low pressure steam or compressed air of 0.2 ∼ 0.8 Mpa pressure range, which is injected into the cold side of the displacer cylinder at the top dead center of the power piston, and the steam or air expands into power cylinder at constant high temperature after passing regenerator and heater. Near the bottom dead center of the power piston, the steam or air is ejected to outside in low temperature after passing the regenerator again as same as Stirling engine. So, this engine works in the combination of Stirling cycle and steam Rankine cycle when steam is used.

In the first half of this paper, dynamic characteristics of conventional decoupler equipped hydraulic mounts are discussed and the demerits of this type of mounts are clarified particularly in case of superimposed inputs and inputs in a high frequency range, say, 300 Hz or more. It is mentioned that decouplers with weak non-linear structures are more effective against superimposed inputs. Concerning inputs in a high frequency range, our newly developed hydraulic mounts which can achieve low dynamic stiffness up to 800 Hz by utilizing liquid-column-resonance against rubber surging of main elastic bodies are explained in details. In the latter half of this paper, the possibility of semi-actively controlled mounts incorporating electro-rheological (ER) fluids into hydraulic mounts are discussed from the theoretical point of view based upon the experimental results taking a simple one-degree-of-freedom vibrational system for example.