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Drop Tower Test Machine for Cable Impact Testing

The axial impact test is performed to measure the mechanical performance of a conductor when subjected to high dynamic impact load.

The TTDTTC instrumented striker system far exceeds the specification with 1,000,000 points per test over any desired time interval. Further, our design not allows automated control of the traveler drop height setting, but it will be possible to load and pretension the cable from the ground. We did include the requested ladder, but it will not be needed for routine testing.

The impact velocity of 8 m/sec can be achieved in about 3.4 m of free fall. Therefore, the free fall height need only be 4 m. Also, there is no need for an anti-rebound device if the cable is not tested a second time.

  • 4 meter drop-height tower. The tower will be about 5 m in total height. (Note: If higher impact velocities are ever needed in the future, Torontech can supply a launcher that will achieve any desired velocity.)
  • 650 kg falling mass. (adjustable weights, 3 fifty kg and 3 100 kg, will allow various combinations of weight and drop height for different impact energy requirements.)
  • The system will include a 200 kg pre-tensioning capability.
  • Interlocked safety enclosure.
  • The dynamic load cell will be designed for a maximum force of 200 kN. (This can be specified higher at the time of order.)
  • Data acquisition computer and Impact v6.3 software.
  • Consolette with pneumatic two-button safety release.
  • Motorized return with hand-held controller (up/down buttons). The drop height setting is done using the encoder system. The desired drop height is put into the computer and the release cart will automatically move down, latch the falling mass, and proceed to the drop height elevation.
  • Second motorized system for installing the cable to be tested. It will fully operate from the ground.
  • Safety stops will be included to protect the falling mass in case the cable breaks.
  • The anti-rebound option is not included because it is not needed. The Torontech data acquisition system records the entire impact event, including the first peak load, and that is what is desired. The secondary rebounds are much lower load and are not important since the next test will involve a new cable segment.