| 摘要 |
A piston position drift control (110) for a free-piston device (112). The control includes a passage connecting internal volumes of the device, the passage (122) being substantially shorter than an acoustic wavelength of the device; and a check valve (124) in the passage for controlling fluid communication between the internal volumes, the check valve having an openin g pressure not less than approximately 20% of a maximum pressure differential of the device at a maximum stroke. The control is passive, requires no active control once in service, provides low susceptibility to damage or fouling, a nd is amenable to adjustment or repair if needed. In addition, the control is small and inexpensive, and functions across the entire operational range of a free-piston device it supports. A related free-piston device including the piston position drift control is also provided.
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