Abstract
This chapter presents the first example of the combination of two actuators
of different volumes with which the principle of adding an expansion work can be
realized. The two semi-rotary actuators are mechanically coupled and describe an
oscillatory motion. Then the oscillatory motion is transmitted to an electric generator
through a so-called motion rectifier. The structure of the new system is presented with
the control valves and control circuitry. The different variables of the system as
pressure, torques, and mechanical work are calculated by simulation. The efficiency of
the new system is calculated and compared with the efficiency of a single actuator
without expansion. The principle of adding an expansion work with semi-rotary
actuators is then presented but with one actuator only where the expansion occurs in
the same and unique chamber. Efficiency, torque waveform and produced mechanical
work are presented, as well the control circuits.
The power reversibility of a system using semi-rotary actuators is addressed, and a
solution with a crankshaft is studied.