Imagine letting a screen door with a spring and hydraulic piston thingy close under it's own volition. Takes all day if the piston's pushing back too hard. Overdamped. I like to debate structural engineering theory -- a lot. If I …
To design structures that can resist vibrations, you need to find the solutions of the vibration model. The solutions can tell you how the structure responds to different types of dynamic loads ...
Please see FAQ731-376: Eng-Tips Forum Policies for tips on how to make the best use of Eng-Tips. RE: Question on Vibrations hokie66 (Structural) 15 Sep 07 05:53
Read PDF online: 36001356 Design of Structures Foundations for Vibrating Machines. Pages 212, Filesize 7.41M. Download as PDF
This has resulted in excessively high vibrations in the structure which is affecting the screen. The screen sits on its own spring isolation base. One idea I had was adding additional isolation under the screen base. So there would basically be two sets of springs in series. I understand spring constants in series are 1/k=1/k+1/k My questions is
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. ... VIBRATION DESIGN JoshPlumSE (Structural) 5 May 14 12:39. ... Join your peers on the Internet's largest technical engineering professional community. It's easy to join and it's free.
It is important to note that modifying the operating frequency of the screen drastically affects several factors, such as stresses on the screen structures, the screening process itself …
In order to efficiently separate materials of different particle sizes and enhance structural strength and reliability of the vibrating screen itself, this paper optimizes a large three-layer circular …
I have recently started reading "Design of structures and foundations for vibrating machines by Suresh Arya, Michael O'Niell and George Pincus. I wonder if some Foundations - Vibrating Machines - Structural engineering general discussion - Eng-Tips
I am designing a roof top screen wall for a three story building. The wall consists of a screen that spans between posts that cantilever 14 ft above roof and spaced 10 ft on center. There is a 2 ft gap between roof and bottom of the screen. I am using ASCE 7-05 for dermining my design wind pressures.
Under operation the structure performs satisfactory. During shut down you will generally have a longer period of vibration as the structure approaches natural frequency, reaches it, and then ramps down. This can be detrimental to the structure if you have not considered the excessive stresses you will get from the displacements.
I'm doing a vibration analysis for a cantilevered floor system. I'm using software to model the floor in order to get the fundamental natural frequency and usin ... Structural engineering general discussion Forum; Vibration Analysis for cantilevers. 3. thread507-275729. Forum: Search: FAQs: Links: MVPs: Menu ... Here's Why Members Love Eng-Tips ...
Some engineers use the provisions for roof top structures and equipment, others use solid freestanding signs, and some argument could be made for using the parapet …
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Springs allow free movement and help to isolate vibration from their support structure, but they also influence the motion of the screen by …
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Structural engineering general discussion Forum; Existing screening building with vibration issues . thread507-288532. ... I found similar limit (10mm/s) in dynamic textbook as well, but it was related to transient vibration. Vibration screen is more like steady-state vibration, will they have different limit. ... Here's Why Members Love Eng ...
For floor vibration analysis, use the absolute best estimate of the actual mass present during the walking event. That'll be the structural weight, accurate estimate of the SDL, and a very small live load. There is no safe side on which to err. A mass overestimate will drive down the natural frequency but will drive up the effective mass.
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The brackets manufactured for holding LCD screws to walls have screws that are relatively close together. This is fine on a static, non-vibrating structure. On a moving, vibrating structure, you need to analyze for the thing to rock in θ and φ, as well as moving in X, Y, and Z. The vibration modes could be interesting.
When designing a dynamically affected structure, one supporting a vibrating screen / vibrating feeder, should I consider the self weight of the screen / feeder when assessing the seismic loading condition? And if so, should I take of the self-weight.
So I went with composite floor beams and I can't use columns inside the house (Owners request). I found that vibration are too much for a residental building (6 Hz). But I don't have real life experience so I want to check if the value of vibration (6Hz) is somewhat right which can be annoying for a residental building
Hey pals, There is a new highway going in near my and my house is taking some vibration every day as they work. Are there any long term effects I should prepare Vibration from nearby construction - Structural engineering general discussion - Eng-Tips
This isn't actually a project of mine but a colleague was asked to provide some preliminary engineering in hopes of getting the job (if it is within cost limits the project will get the green light). From what I understand it will be (3) stories and in a hurricane prone region.
Since these frequencies make up the wind gust (which acts simultaneously on the building) these responses must be combined to determine the overall response of the structure due to the wind gust. So simply put, yes, for a wind gust or seismic event it will be a combination of all of the modes of the building.
Glasses of water are our enemy when it comes to floor vibrations. They're a great "sensor" to alert the occupants to vibration. Once users are alerted to vibration, they are much more sensitive. I've seen floors that had to get down from about 0.5 %g to 0.2 %g to satisfy occupants who have been alerted. We don't want them thinking about this.
Solving vibration issues in existing buildings (particularly wood framed residential structures with finishes applied directly to the structure) are some of the hardest puzzles we have to solve. And not all structural engineers are as skilled in it as others. I'd like to think I have a decent grasp on the concepts, but I don't consider my expert.
Managing underperforming vibrating screens From Quarry Magazine, December 2018 Go Back The focus of this article is the aspects of vibrational behaviour that affect the life of a screen, rather than the motion relating to its application. It should also be noted that where most screens appear to run poorly, there are a small number of […]
I have been designing a structure to support a 10,000lb. vibrating conveyor that generates approximately 800lb. horizontal load and the frequency of the equipme ... I like to debate structural engineering theory -- a lot. ... I would take the time to verify that the natural frequency of the screen does not match up with your structure. The ...
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. ... Floor Vibration JAE (Structural) 16 Jun 03 14:18. ... Join your peers on the Internet's largest technical engineering professional community. It's easy to join and it's free. Here's Why Members Love Eng-Tips Forums:
Springs allow free movement and help to isolate vibration from their support structure, but they also influence the motion of the screen by magnifying the vibration through "dynamic response". Significant differences in spring heights …
Engineering professional? Join Eng-Tips Forums! Talk With Other Members; Be Notified Of Responses ... maybe if we all scratched a "271828" or whatever screen name onto our nametags... RE: Cantilever Vibration Analysis 271828 ... Any decent vibrations or structural dynamics book will have example problems with single masses subject to various ...
Vibratory Screen Support Structures and associated Chutes, Hoppers and Piping Design Industrial / By Dynamic Engineering Dynamic Engineering can assist our clients to improve plant throughput by designing screen support structures
I am adding a new wood chip screen, and need to design the concrete foundation. I have been given the following from the screen vendor. ... Structural engineering general discussion Forum; Dynamic Load on Foundation from Screen. thread507-283884. Forum: Search: FAQs: Links: ... You need to look at the vibration spectrum as well as the magnitude ...
Davis, D.B. and Murray, T.M. "Slender Monumental Stair Vibration Serviceability," Journal of Architectural Engineering, ASCE, December 2009. RE: Stair Vibration Check paddingtongreen (Structural) 27 Apr 12 07:09