Are you referring to the frequency of barrels of different stiffness? Please explain.brians356 said:PS
It occurs to me that larger amplitude will not necessarily be accompanied by lower frequency.
Are you referring to the frequency of barrels of different stiffness? Please explain.brians356 said:PS
It occurs to me that larger amplitude will not necessarily be accompanied by lower frequency.
gunsandgunsmithing said:Are you referring to the frequency of barrels of different stiffness?brians356 said:PS
It occurs to me that larger amplitude will not necessarily be accompanied by lower frequency.
gunsandgunsmithing said:Please explain.
brians356 said:gunsandgunsmithing said:Are you referring to the frequency of barrels of different stiffness?brians356 said:PS
It occurs to me that larger amplitude will not necessarily be accompanied by lower frequency.
Not necessarily.
gunsandgunsmithing said:Please explain.
No, thanks. Feel free to expound at length, I'll read with considerable interest.
gunsandgunsmithing said:brians356 said:gunsandgunsmithing said:Are you referring to the frequency of barrels of different stiffness?brians356 said:PS
It occurs to me that larger amplitude will not necessarily be accompanied by lower frequency.
Not necessarily.
gunsandgunsmithing said:Please explain.
No, thanks. Feel free to expound at length, I'll read with considerable interest.
I'll just say that I have been of the belief that a cantilevered beam of a given stiffness will have it's own natural frequency that stays constant..generally. So, I wish you'd either explain how I'm wrong or not make such posts. There's far too much misinformation in regard to this subject, already. Now I'm listening and am eager to learn something new on this subject, as long as it's relative.
I'll try to find a link, but much like a tuning fork, it is my understanding that it will ring at the same frequency(not amplitude) regardless how hard it is struck.zfastmalibu said:Mike, how did you get to the opinion that barrels have a natural frequency that is constant? Not disagreeing, just wanting to learn. Seems to me that frequency would be greatly affected by the pressures in the barrel as well as bullet weight.
gunsandgunsmithing said:I'll try to find a link, but much like a tuning fork, it is my understanding that it will ring at the same frequency(not amplitude) regardless how hard it is struck.zfastmalibu said:Mike, how did you get to the opinion that barrels have a natural frequency that is constant? Not disagreeing, just wanting to learn. Seems to me that frequency would be greatly affected by the pressures in the barrel as well as bullet weight.
My apologies if I misunderstood what you were saying. Perhaps your use of the term..."[SIZE=x-small]will not necessarily be accompanied by lower frequency was used similarly to my use of "generally". [/SIZE]brians356 said:gunsandgunsmithing said:brians356 said:gunsandgunsmithing said:Are you referring to the frequency of barrels of different stiffness?brians356 said:PS
It occurs to me that larger amplitude will not necessarily be accompanied by lower frequency.
Not necessarily.
gunsandgunsmithing said:Please explain.
No, thanks. Feel free to expound at length, I'll read with considerable interest.
I'll just say that I have been of the belief that a cantilevered beam of a given stiffness will have it's own natural frequency that stays constant..generally. So, I wish you'd either explain how I'm wrong or not make such posts. There's far too much misinformation in regard to this subject, already. Now I'm listening and am eager to learn something new on this subject, as long as it's relative.
You're rather demanding, considering this is an open and informal forum, and that I did not purposefully or directly challenge anything you may have previously asserted, but I'll humor you anyway:
What I wrote:
"It occurs to me that larger amplitude will not necessarily be accompanied by lower frequency."
... does not in the least contradict your statement:
"a cantilevered beam of a given stiffness will have it's own natural frequency that stays constant..generally".
(And I'll note your qualifier "generally" with mild amusement, and let it go at that.)
Anticipating your objection to my new assertion, I'll preemptively point out that another way of putting what I wrote might be: "Given a barrel of a certain stiffness, it can be vibrated with varying amplitude at it's natural frequency."
I agree, Alex. This is and can still be a positive thread. Please don't let my misunderstanding of Brian's post to take it off track.zfastmalibu said:Mike, I'll give you a opposing idea for you to argue. The barrel is deflected down ward from gravity. The pressure in the barrel as well as the natural effect of the rifle rotating around its center of gravity start the barrel moving in its upward motion. The amount of pressure and recoil effect the amount the barrel is propelled upward. The less it is propelled the less amplitude it will have.
Alex
seymour fish said:Length and diameter play into stiffness. Stiffness and composition of material play into notion of a natural excitation frequency. Energy applied might be seen to affect amplitude of sine wave, not frequency.
I will "generally" refer to barrels by their respective stiffness moreso than size OR length.JRS said:Mike:
The frequency will change as the OD of the barrel changes, along with the diameter of the bore. The length isn't going to make a difference. For instance, if you strike a piano key for C2 (65.4 HZ) you will indeed hear 65.4 HZ. If you strike a C2 chime, you will not hear 65.4 HZ. In fact, you will not even hear 180 HZ.
seymour fish said:Mike, you are correct. Brians356, you are also correct, with the caveat that the width of the node found in a wide amplitude system can be quite acceptably wide for a given purpose, whereas the width of the node for a postulated system of near-zero amplitude and ultra-high frequency could likely not be resolved, as would appear infinite excepting vertical dispersion at long range due to variation in MV. See above post for couple real-world extreme examples. Seymour
Absolutely! Barrel stiffness is a more fitting description than other nomenclature, IMO. Stiffness increases greatly with shortening.seymour fish said:JRS, You have lost me, as when I strike a pipe, then cut it in half and strike it again, it rings at higher frequency. Seymour