Hello

I not familiar with SolidWorks nar simulation.

Now I'm try to run nar dynamic simulation on a gantry structure.

Even the acting forces are fixed it shows variation on displacement graft.

How to done this simulation correctly.

01. the structure which irun the simulation.

02. How i have apply the force to middle of structure.

03. Result.

In my input there is no variation of force til 5 seconds. But the graft show vibration.

Relevant file attached with this.

Thank you.

Udaya.

As implied by Erik it would be a good idea to study up on 1DOF system behavior. You could try here: (Vibration - Wikipedia ). A few things to understand might be: a zero height impact has a deflection of 2x the static deflection. Imagine an elastic band with a weight on it. and your are holding the weight at the relaxed length of the elastic and then you let the weight drop. the peak deflection will 2x the static deflection once the oscillations stop. Damping sucks energy out of the system and typically generates some heat for material damping or causes the air around the structure to move and dissipate energy for viscous damping. Coulomb friction shows up in joints and does pretty much the same thing. So the general procedure is to get familiar will your structure by doing a frequency response to know what modes are going to be excited by your vibratory inputs. You generally want to have the mass participation factors in all 3 directions to be above 80% but this is not always possible, depending on the problem. The highest of the frequencies will determine your temporal resolution say 1/10 of the shortest period might be a good number in a dynamic analysis. the duration would be governed by the longest period and how much time you want to capture. If you have no non-linearities a good choice is linear dynamics. IF you have no clue on damping (as is often the case) a few percent for a logarithmic decrement is not a bad choice. Damping is usually determine in test or by experience (doing many similar problems and testing the response to develop a feel for your class of problems). The purpose of a dynamic analysis is to try and capture the dynamic amplifications due to the proximity of the excitation to a natural mode of vibration, attenuated by the damping. If no damping or insufficient damping is present and the vibratory input is on going then the structure will gain energy until catastrophic failure occurs. For a single event load input a dynamic analysis may not be necessary. A static analysis with some logic maybe sufficient to bound the response. Alternatively a short dynamic analysis that captures the peak of the initial response maybe sufficient (lowest order mode of interest). It really helps to understand the behavior of a single mass damper systems vibratory response to gain some insight into how structural dynamics behaves. It is much easier to help when some understanding of what you are into is conveyed in a question. If you have some understanding of the phenomena involved then running the program is much easier.