How to improve Natural frequency of a System(assembly of more than 20 Parts interconnected)
How to improve Natural frequency of a System(assembly of more than 20 Parts interconnected)
(OP)
How to improve Natural frequency of a System(assembly of more than 20 Parts interconnected)
My Problem definition is as below..
a system of 20 parts which are interconnected are given..
Run a Modal analysis...
Identify Some major modes (Bending and Torsion importantly)
Then i have to improve the system frequency..
for this I need to know following things:
1) Which part is major contributor to a particular mode, say BENDING? This i can see the mode shape and identify which components are having displacement..
2) Now i want to know in which part of the component i need to work to improve the natural frequency? Is there any procedure to identify the zone which i should concentrate?
ANY reference link also would be helpful, Where i can see How i can arrive at the critical zones of a component in a system based on natural frequency..
Thanks in advance..
Damodharan B
My Problem definition is as below..
a system of 20 parts which are interconnected are given..
Run a Modal analysis...
Identify Some major modes (Bending and Torsion importantly)
Then i have to improve the system frequency..
for this I need to know following things:
1) Which part is major contributor to a particular mode, say BENDING? This i can see the mode shape and identify which components are having displacement..
2) Now i want to know in which part of the component i need to work to improve the natural frequency? Is there any procedure to identify the zone which i should concentrate?
ANY reference link also would be helpful, Where i can see How i can arrive at the critical zones of a component in a system based on natural frequency..
Thanks in advance..
Damodharan B





RE: How to improve Natural frequency of a System(assembly of more than 20 Parts interconnected)
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: How to improve Natural frequency of a System(assembly of more than 20 Parts interconnected)
I am just looking for an step by step procedure on How to arrive at my critical location for natural frequency improvement..
Some kind of Algorithm based steps..
Let see if someone can help me from here
RE: How to improve Natural frequency of a System(assembly of more than 20 Parts interconnected)
Rob Stupplebeen
www.optimaldevice.com
RE: How to improve Natural frequency of a System(assembly of more than 20 Parts interconnected)
RE: How to improve Natural frequency of a System(assembly of more than 20 Parts interconnected)
TTFN

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RE: How to improve Natural frequency of a System(assembly of more than 20 Parts interconnected)
RE: How to improve Natural frequency of a System(assembly of more than 20 Parts interconnected)
RE: How to improve Natural frequency of a System(assembly of more than 20 Parts interconnected)
TTFN

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Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
RE: How to improve Natural frequency of a System(assembly of more than 20 Parts interconnected)
Decrease the weights
Increase the stiffness of the assembly
Lowering the center of gravity
Add more fixation points
RE: How to improve Natural frequency of a System(assembly of more than 20 Parts interconnected)
Frequently we are faced with the decision of modifying your structure in order to meet stringent design criteria. In most instances, your objective is to maximize the benefits with minimal changes. The element strain energy output result is an excellent tool for identifying areas of modification that will reap the most benefits for design changes, I used a lot when performing an eigenvalue analysis using FEMAP & NX NASTRAN. The element strain energy is basically the elastic energy stored in the structural element.
For example, a value of 48.8 for the strain energy output for one element means that it contains 48.8% of the total strain energy of the whole FE model. In other words, this element is the MOST effective element to modify if you wish to increase the stiffness of the structure for the same amount of weight increase.
As you can see, the element strain energy output is an extremely useful tool in helping you to identify the most efficient locations for modification.
Best regards,
Blas.
~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director
IBERISA
48004 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog de FEMAP & NX Nastran: http://iberisa.wordpress.com/
RE: How to improve Natural frequency of a System(assembly of more than 20 Parts interconnected)