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--"agree with greglocock, the natural frequency is not to be confused with the forced response." I fully agree as well.

israelkk and sms, That is true assuming the "springs" are in series. If the load path is such that the various springs are in parallel then the opposite is true, the equivalent K value is dominated by the stiffer components. This is a point which I left out of my last post that goes to support...

sms- All of that is true, I don't disagree at all. I am looking to estimate what the natural frequency is. My initial confusion came down to not knowing what K was, or more specifically that K=0 and therefore, fn=0...if I was relying solely on the K of the spring. Throughout the thread it...

thanks folks, but all i am trying to do is find the Natural Frequency of the system. Just like a tuning fork, the system has a first fundamental frequency which produces the greatest deflections. This is a Modal Analysis to discover the natural frequency of this system. Once it is built I can...

sreid, the holding torque is not a source of vibration here, I am looking to calculate the natural frequency of that spring if it were excited by some outside vibrating source. It is important to know this natural frequency so as to avoid exposing the system to sources which might excite it...

True, but what I am calculating is natural frequency of the system (resonance).

Greg, sorry if I'm confusing matters further. Simply stated, lets say I have a door on a hinge that is allowed to swing from initial position thru 60 degrees at which point there is a hardstop which prevents further swing. A spring is inside that hinge providing torque to swing the door and...

Greg, There is a set of flat negator springs stacked on one another to provide a quoted minimum torque ~6in-lbs. These are integrated into the hinge mechanism directly at the hingeline. Hardstop at full deployment puts the 2 halves of the hinge 180 deg apart. Stowed position in my...

lsraelkk-that is exactly some of the points i have been coming up with. Thanks. I am still curious to know of a better formula than the original one i posted to relate that holding torque to fn. It makes sense to me that the greater the holding torque applied against the hardstop at full...

sms, I guess I did mix terminology in the subject line and body of the post. Krot, rotational spring constant is also refered to as the rotational spring stiffness. May not be technically correct though.

I take that to mean you agree that Krot=zero. I guess the more direct question is what is the relationship between drive torque about the hingeline and the natural frequency of the driven mass? Thanks.

I am trying to estimate, ultimately, the natural frequency of a mass attached to a hinge which is driven by a constant torque spring motor (negator). More specifically this is a deployed solar panel that rotates about the hinge axis with a known, constant applied torque. Normally, if the hinge...