Pneumatic Shock Machines

VST Pneumatic Shock Machines are available in multiple configurations including Vertical and Horizontal options. The Mouse Trap Amplifier option produces very high G levels and can replicate "live fire" shock events that occur in firearms.

PSM series machines use compressed air to accelerate the carriage toward the impact surface. Elastomer pads between the carriage and impact surface are used to produce half-sine pulses. Pneumatic cylinders and lead pellets are used for trapezoidal and terminal sawtooth pulses respectively. The design of the half-sine programmer essentially determines the duration or Delta T while air pressure and drop height provide the energy for the magnitude or G level of the pulse.

The core structure of the machine is a heavy steel weldment filled with reinforced concrete. This structure forms the reaction mass and is supported by passive air springs to isolate any shock load from the floor. Viscous dampers arrest the air spring oscillations just like the shock absorbers in a car.

Heavy duty threaded inserts installed on the working surface of the solid aluminum carriage provide the hole pattern used to hold items or fixtures for test. The carriage is supported and guided by the main cylinder. Hydraulically actuated friction brakes hold the carriage in the drop position while air pressure builds in the main cylinder. Each PSM series machine is equipped with an air amplifier to produce charge pressures well above the supply pressure. The brakes are released once the desired charge pressure is attained and the carriage accelerates towards the impact surface. Following the impact event, the brakes activate during the rebound to arrest the carriage and prevent a double hit.

The whole process is controlled by VST ShockTool software. ShockTool provides machine control and data aquisition/analysis in one package and is included with each machine.

Pneumatic Shock Machine
Table Options Working Surface in Inches X Inches

Power Requirements

Payload LBS
0909 1616 1818 2424 3030 4040 6060 Control Power Min Air Requirement**
100 X X*

110-220 VAC 90W 90 PSI @ 5CFM


110-220 VAC 90W 90 PSI @ 10CFM

X X X X*
110-220 VAC 90W 90 PSI @ 10CFM

X X* 110-220 VAC 90W 90 PSI @ 30CFM
0404MTA Bolt On Bolt On Bolt On Bolt On Bolt On Bolt On Bolt On 0.2ms-1.5ms up to 5000g Half-sine
0909MTA Built In
Built In
Bolt On Bolt On Bolt On Bolt On Bolt On 0.5ms-3.0ms up to 2000g Half-sine
VH Vertical Horizontal


Machine can be used in either mode
SW Square Wave

X X X X X Not Available on PSM100
TSP Terminal Sawtooth Pulse X X X X X X X Achieved by impacting lead pellets

* Working Surface is achieved via Head Plate / Head Expander **The cycling rate increases with more CFM**

All Contents 2012 VST, Inc.