Constant frequency fluid-mechanical oscillator

Claim 1

A SUBSTANTIALLY CONSTANT FREQUENCY FLUID MECHANICAL OSCILLATOR COMPRISING A FLUID AMPLIFIER DEVICE HAVING FIRST MEANS INCLUDING INLET AND OUTLET CONNECTIONS PROVIDING A FLOW OF POWER FLUID THROUGH SAID DEVICE AND SECOND MEANS PROVIDING A FLOW OF CONTROL FLUID OF CONTROLLING THE FLOW OF POWER FLUID, FREQUENCY RESONANT, SLIDING FRICTION-FREE, ALL MECHANICAL OSCILLATING MEANS INCLUDING EXCITING MEANS COMMUNICATING WITH SAID OUTLET CONNECTIONS FOR APPLYING THE THE FLOW OF POWER FLUID AT SAID OUTLET CONNECTIONS TO SAID MECHANICAL OSCILLATING MEANS FOR GENERATING MECHANICAL OSCILLATIONS OF A PREDETERMINED AND SUBSTANTIALLY CONSTANT FREQUENCY, AND PICKUP COUPLING MEANS FOR DERIVING FLUID FREQUENCYCONTROL SIGNALS OF THE PREDETERMINED CONSTANT FREQUENCY FROM SAID MECHANICAL OSCILLATING MEANS, SAID PICKUP COUPLING MEANS COMMUNICATING WITH SAID SECOND MEANS FOR APPLYING SAID FLUID CONSTANT FREQUENCYCONTROL SIGNALS TO SAID SECOND MEANS TO VARY THE FLOW OF CONTROL FLUID IN ACCORDANCE WITH THE FLUID CONSTANT FREQUENCY-CONTROL SIGNALS, THE VARYING FLOW OF CONTROL FLUID CONTROLLING THE FLOW OF POWER FLUID TO PROVIDE AN OSCILLATING FLOW OF POWER FLUID OF THE PREDETERMINED CONSTANT FREQUENCY SUBSTANTIALLY INDEPENDENT OF CHANGES IN FLUID TEMPERATURE AND PRESSURE AT SAID OUTLET CONNECTIONS.