Free Fall Shock Machine  |  Pneumatic Shock Machine  | Horizontal Shock Machine |  Bump Tester

Free Fall Shock Machine
Specifications

The Free Fall Shock Machine is designed to produce classical shock wave shapes by dropping a table supported on its side by Thompson Rods and Bearings. The table drop height may be set at pre-determined heights for shock pulse repeatability. Acceleration levels are generated by drop height while time duration is a function of the programmer provided; elastomer pads for half-sine, lead pellets for sawtooth and pneumatic cylinders for square wave pulses. Accelerated fall machines using bungee cord are also available from M/RAD. Every machine is supplied with brakes to prevent repeated impacts and incorporate a massive steel reaction mass mounted on springs with dampers to isolate the shock from the floor. The optional Mousetrap Amplifier is avalable for the Free Fall Shock Machine.


Pneumatic Shock Machine
Specifications

Download a movie of the M/RAD Pneumatic Shock Machine in action. (AVI format; 3.7 Mb.)

The pneumatic shock machine is available in three table sizes (9, 16 and 24 inches square). Table extenders may be provided to increase table size. These machines will produce a shock pulse in the vertical direction using compressed air to force the carriage to impact on the shock machine base. Elastomer pads are used between the carriage and the base in the impact area to produce half-sine pulses, lead pellets for sawtooth pulses and pneumatic cylinders for square pulses. The design of the programmers affect the time duration of the pulse while the air pressure and drop height are used to accelerate the carriage to determine the magnitude of the shock pulse. The basic structure of the machine is a heavy steel weldment filled with reinforced concrete which will not deteriorate under repeated shocks. The structure contains sufficient mass so that no additional ballast will be required. The structure is supported on four passive air springs with dampers to isolate the shock from the floor. The test item is mounted to a solid carriage with heavy duty steel inserts in the top surface. The carriage is supported and guided by the lifting and driving piston rod. Friction brakes are used as a rebound brake and as a quick release device. A microprocessor control is available to provide a single point for shock machine set up. The controls for the machine are mounted in a control panel on the front of the machine. All regulators, gauges, signal lights, relays and push buttons are located here. An optional remote control panel is available. The optional Mousetrap Amplifier is can be combined with the Pneumatic Shock Machine.


Horizontal Shock Machine

The M/RAD Pneumatic Shock Machine will produce a pulse in the vertical or horizontal direction using compressed air to force the carriage to impact on the shock machine base. Elastomer pads are used between the carriage and the base to generate half-sine pulses, lead pellets for sawtooth pulses and gas generators for square or trapezoidal pulses. The design of these programmers effect the time duration of the pulse while the air pressure and drop height determine the magnitude (G level) of the shock pulse.


Bump Tester

The M/RAD Bump Tester has been designed to meet the Bump Test requirements of BS 2011, IEC 68-2-27 and IEC 68-2-29.

According to BS 2011, Part 2.1Eb: "The machine is intended to reproduce the effects of repetitive shocks likely to be experienced by components and equipment during transportation or when installed in various classes of vehicles."*

* BS 2011: Part 2.1Eb: 1987
   IEC 68-2-29: 1987