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Everything posted by Dp12

  1. Hi Rahul, what is TREF in MAT1 card. I am simulating exhaust manifold and having temperature distribution over all nodes. I have run the linear static analysis but stresses are very very high >500MPa. When I am useing Tref =400 deg C, then stresses are low. My average temp over exhaust manifold nodes is 500deg C. Please comment. Thanks in advance. Regards, Dheeraj
  2. Hi, I have gone thru the hyperview post processing document where corner data & averaging method is explained for shell and solid element. Those explanations are bit confusing. Please clarify if I have done static analysis of Floor assembly in Abaqus & have .odb result file and want to do post processing in Hyperview. Then in Abaqus CAE, I am quoting the stress as Simple average (75%). To correlate same result,which option is best tin Hyperview- 1) Corner data should be on or off? 2)Averaging method should be simple,NONE or Advanced? 3) which combination of corner data & averaging method. I tried with all options and I got 20% deviation in hyperview. Thanks in Advance. Regards Dheeraj Pandey
  3. Hi, what will be the unit & calculation method of PSD stress . If I quote von mises stress under PSD stress then what result I can interpret Thanks in advance.
  4. Dp12

    FRF analysis

    Thanks for sharing the paper. But that was done with defined load as excitation. My query is different. What excitation (g value) should I use in CAE for FRF analysis of an overhang part - Example If I found acceleration peak of 2 G at 1500 RPM in engine sweep up data ( acceleration vs RPM -idle to full throttle). My engine is 4 cyl - 4 stroke then engine resonance freq is (1500/60)*2 = 50Hz then when I again run the engine at 1500RPM (50 Hz), and get FFT data - Acceleration vs Frequencies. So, at 1500 RPM, there are various acceleration peaks at 50 Hz and its harmonic. But its acceleration values are 0.7 G or 0.5 G. So, for FRF analysis in CAE, which G value I should take - 2 G or 0.7 G?? Thanks in advance
  5. Dp12

    PSD analysis

    Thanks for the information. At the time of postprocessing, which output is more useful to determine the life cycle. PSD or RMS??
  6. Hi, I am performing FRF analysis of an overhang part mounted on engine. From testing, I requested following vibration data at mounting and at tip- 1) G vs RPM (sweep up) - from this I got to know at which RPM, G value is maximum due to resonance. 2)FFT data (G vs Freq) at that single RPM where G was maximum while sweep up. Now, my query is ...from FFt data, my maximum G value at particular frequency is less than 1G . But from sweep up data (G vs RPM), if I check G value at that RPM , then it is more than 3G. So, Now For FRF analysis in CAE, which G value I should take for excitation input (from FFT or from sweep up). How to correlate max. displacement and acceleration plotted at tip in CAE with testing. Thanks in advance.
  7. Hi, I am currently performing random vibrartion analysis, where I have sweep up PSD data for muffler. I have some query mention below: 1)From testing, I got PSD data (G^2/Hz vs Freq) . Do I have to change it into { (mm/sec2)^2 vs freq}. 2)when I am giving the input in (G^2/Hz vs Freq) and FRF excitation as 1 , then PSD stress is very very less e-7. 3)Plz suggest the appropriate methodology step by step for providing - input (in which form) and post-processing method to interpret results (which stress is useful). Thanks in Advance
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