coneboy
Geotechnical
- Oct 20, 2001
- 79
I am a Geotech Engineer and have become invloved in the design of a hammer impact unit.
We need to build a mechnanical device that will push a rod horizonatlly and hit a
plate horizontally. The striker rod will be activated by a switch and upon activation it will shoot out and strike an anvil. We are hoping the impact rod will achieve at least a velocity of 4 m/sec. We need the rod to strike the anvil with at least 50 Juoules of energy. After impact we will measure the waves this device causes in the earth. The device then needs to be able to repeat the striking procedure for 1000's of hits. Approx 30 seconds between strikes is the time frame we are hoping for, or less. We are going to enclose this device inside a sealed chamber.
My question: What kind of device would use to create the desired impact?
The two items impacting need to be steel, and the impact needs to be steel on steel.
(Similar to gently swinging a 8 kg sledge against a steel block)
As far as I can see hydraulic power would be to slow to push a striker rod out at 5 m/s.
Also hydraulic power supply issues eliminates this possibility. Would an air actuated pneumatic cylinder work? Do pneumatic cylinders stand up to repeated impacts?
What do you think about linear thrust actuators? I did not see any that achieved the desired speed. Would you recommend the use of simple tension or compression springs for propelling the striker against the anvil for a design?
Any ideas or simple solutions that you have are greatly appreciated. Feel free to shoot down any of my comments as un-acceptable or expand on them as you see fit.
Coneboy
Geotech Pro Eng
We need to build a mechnanical device that will push a rod horizonatlly and hit a
plate horizontally. The striker rod will be activated by a switch and upon activation it will shoot out and strike an anvil. We are hoping the impact rod will achieve at least a velocity of 4 m/sec. We need the rod to strike the anvil with at least 50 Juoules of energy. After impact we will measure the waves this device causes in the earth. The device then needs to be able to repeat the striking procedure for 1000's of hits. Approx 30 seconds between strikes is the time frame we are hoping for, or less. We are going to enclose this device inside a sealed chamber.
My question: What kind of device would use to create the desired impact?
The two items impacting need to be steel, and the impact needs to be steel on steel.
(Similar to gently swinging a 8 kg sledge against a steel block)
As far as I can see hydraulic power would be to slow to push a striker rod out at 5 m/s.
Also hydraulic power supply issues eliminates this possibility. Would an air actuated pneumatic cylinder work? Do pneumatic cylinders stand up to repeated impacts?
What do you think about linear thrust actuators? I did not see any that achieved the desired speed. Would you recommend the use of simple tension or compression springs for propelling the striker against the anvil for a design?
Any ideas or simple solutions that you have are greatly appreciated. Feel free to shoot down any of my comments as un-acceptable or expand on them as you see fit.
Coneboy
Geotech Pro Eng