7 Replies Latest reply on Feb 13, 2015 2:49 PM by Jared Conway

Sine Vibration Analysis $$$

AJAY SELVAM Jan 28, 2015 1:12 AM

Dear Guys,

Which do you feel is better method (among MTH, HA, RV & RSA) to perform Sine Vibration for 2.5 Hrs and Frequency Range: 8Hz to 440Hz.... !!!

Considering Acceleration...,

MTH/ TA : Time Vs g

HA : Hz Vs g

RV : PSD Vs Hz

RSA : Hz Vs g

Input is applied by 15min logarithmic sweep in (8-440)Hz band...!!!

Cheers guyz...

Ajay

Re: Sine Vibration Analysis $$$

Jared Conway Jan 29, 2015 3:13 AM (in response to AJAY SELVAM)

assuming you only care about max response and that 2.5hrs is basically steady state operation at each frequency, the right choice is harmonic analysis
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- Re: Sine Vibration Analysis $$$
  
  AJAY SELVAM Jan 29, 2015 4:09 AM (in response to Jared Conway)
  
  Hi Jared,
  
  How can we input 2.5hrs in Harmonic analysis... ?
  
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  - Re: Sine Vibration Analysis $$$
    
    Jared Conway Jan 30, 2015 7:43 PM (in response to AJAY SELVAM)
    
    you can't, harmonic assumes steady state, what are you trying to take into account happening after 2.5hrs?
    
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    - Re: Sine Vibration Analysis $$$
      
      AJAY SELVAM Feb 5, 2015 11:13 PM (in response to Jared Conway)
      
      Jared,
      I would like to analyze Sine Vibration for 2.5 hrs to determine how the enclosing withstands....
      If not Harmonic in which can we include these inputs of (g Vs Hz)....
      Cheers
      
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      - Re: Sine Vibration Analysis $$$
        
        Jared Conway Feb 6, 2015 7:31 PM (in response to AJAY SELVAM)
        
        what do you think will happen if you run it for 2.5hrs vs 1 hr?
        
        the only study that takes TIME into effect is a time history analysis or nonlinear dynamic
        
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    - Re: Sine Vibration Analysis $$$
      
      AJAY SELVAM Feb 8, 2015 11:39 PM (in response to Jared Conway)
      
      followed by Sine vibration is the Thermal cycling...!!
      
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      - Re: Sine Vibration Analysis $$$
        
        Jared Conway Feb 13, 2015 2:49 PM (in response to AJAY SELVAM)
        
        still not sure what you're trying to take into account here.
        
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