Note: Machine is out of stock and it is not included in the price of electronic kit
* Prices does not include taxes.
Shockabsorber dynamometers are usually powered by 3-phase AC induction electric motors. The motors size and power is limited to its supply voltage. It is strongly recommended to drive the motor with a VFD to be able to perform the automated multi-speed tests. For power values under 4 HP, the VFD can be powered from a single phase grid. But for higher power values, normally 3-phase grid is necessary
Output from the motor is geared down with a reduction box. The maximum output shaft speed should be in the 300 to 500 RPM range.
Note that although most induction motors work at 1450 RPM at 50 Hz, the VFD can easilly increase this speed up to almost twice (100 Hz), which results in a high torque at low RPM (for 300 RPM reduction box), and increased speed to allow testing the shockabsorber at higher speeds with a small reduction in total power
This mechanism consists of a drum (crank), connecting rod, and piston similar to the piston-crank mechanism in an internal combustion engine. The drum has holes drilled to achieve different stroke lengths. The disadvantage of using this mechanism is that it does not produce perfect sinusoidal motion in the piston, but having a longer connecting rod can compensate for this. Although it is not necessary to have sinusoidal motion, it does help reduce vibration. The advantage to this mechanism is its cost effectiveness because there is less high tolerance machining.
The scotch yoke has one advantage over the piston-crank mechanism. It produces perfectly sinusoidal motion. The scotch yoke has two major disadvantages. It is expensive. The fine tolerance that would be required for the slider would increase machining costs. There is also more maintenance required with a slider joint.
Shockanalyzer DAQ uses a 100 mm potentiometer to meassure speed and position, this part is supplied with the kit.
There are ten screewed holes located over spiral shape, connecting rod can be fixed in any hole to select stroke length. The longer the stoke, the greather the power needed on motor to move the shock absorber. At higher stroke, it is possible that the motor couldn't move the shock absorber, thus we recomed to start at position 1 and increase it step by step (this part is not included)
A load cell is a transducer that converts force on it into analog electrical signals. A load cell attached to the crossbeam will measure the force placed on the shock.
Shock temperature is measured using a thermocouple attached to the casing of the shock with a Velcro strap. Shock performance can vary dramatically at different temperatures. With the temperature monitoring system, you can determine how your shock will proform under various temperatures. You can warm the shock directly on dynamemeter (thermocouple is not included in the kit)