- #1
m3atwad
- 3
- 0
Hey guys,
I'm working on solving a problem of figuring out what an impact velocity is going to be roughly. The numbers seem very small to me though so I was wondering if you guys could check out my work. This isn't a homework problem, but rather a real problem. I"m trying to build a test device that will generate an impact shock. Basically I'm taking two plates, using bungee cord, and slamming them together. I've modeled this after the classic spring and mass problem (mechanical vibrations, free and undamped) using it's standard second order differential equation. I realize some of the real world problems (friction etc...) that will inhibit my performance, but I'm just trying to get a rough idea here so I'm assume all ideal conditions.
The idea here is that I've got a plate attached to bungee, or a spring, stretched 1 meter past it's equilibrium point and it is locked here with the bungee/spring providing 100,000N of force. The initial position x(0) = 1 meter and the initial velocity x'(0) is zero. I then pull the release pin, it shoots down and impacts the bottom plate.
I'm trying to find the velocity just before impact. I feel like this velocity should be pretty high since my force is extremely large (100kN), but I'm getting just under 7 meters per second. That seems slow. Anyways, I've attached my work so if someone could check it out and let me know if I'm correct or I've messed up and where I'm going wrong. Any general recommendations for building an impact shock table are helpful, but I'm looking mainly for guidance because I'm worried about there being no way for me to possibly create enough force to accelerate a plate to create an impact of 10's of thousands of g's (i'd like 20 or 30kg's) which is the end goal for me.
Here is a link to an example problem that's similar.
http://www.stewartcalculus.com/data/CALCULUS%20Concepts%20and%20Contexts/upfiles/3c3-AppsOf2ndOrders_Stu.pdf
Attached is a pdf of my work and a picture of my system as a spring mass problem. Thanks again for any help I really appreciate it.
Rob
I'm working on solving a problem of figuring out what an impact velocity is going to be roughly. The numbers seem very small to me though so I was wondering if you guys could check out my work. This isn't a homework problem, but rather a real problem. I"m trying to build a test device that will generate an impact shock. Basically I'm taking two plates, using bungee cord, and slamming them together. I've modeled this after the classic spring and mass problem (mechanical vibrations, free and undamped) using it's standard second order differential equation. I realize some of the real world problems (friction etc...) that will inhibit my performance, but I'm just trying to get a rough idea here so I'm assume all ideal conditions.
The idea here is that I've got a plate attached to bungee, or a spring, stretched 1 meter past it's equilibrium point and it is locked here with the bungee/spring providing 100,000N of force. The initial position x(0) = 1 meter and the initial velocity x'(0) is zero. I then pull the release pin, it shoots down and impacts the bottom plate.
I'm trying to find the velocity just before impact. I feel like this velocity should be pretty high since my force is extremely large (100kN), but I'm getting just under 7 meters per second. That seems slow. Anyways, I've attached my work so if someone could check it out and let me know if I'm correct or I've messed up and where I'm going wrong. Any general recommendations for building an impact shock table are helpful, but I'm looking mainly for guidance because I'm worried about there being no way for me to possibly create enough force to accelerate a plate to create an impact of 10's of thousands of g's (i'd like 20 or 30kg's) which is the end goal for me.
Here is a link to an example problem that's similar.
http://www.stewartcalculus.com/data/CALCULUS%20Concepts%20and%20Contexts/upfiles/3c3-AppsOf2ndOrders_Stu.pdf
Attached is a pdf of my work and a picture of my system as a spring mass problem. Thanks again for any help I really appreciate it.
Rob