| 摘要 |
A pneumatic cylinder and piston actuator for successively accelerating and decelerating a structure to be tested. It includes a reservoir for gas under pressure, an accelerating cylinder and piston, and a decelerating cylinder and piston, the latter being of smaller diameter but longer stroke than the former. Upon release of a pneumatic pressure hold down, the accelerating piston, actuated by reservoir pressure, accelerates both pistons. Upon termination of the stroke of the accelerating piston the reservoir pressure decelerates the other piston, which is connected to the device to be tested. A non-return device terminates each such cycle, after which the actuator is reset.
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