# Dp12

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7

1. ## How to set Temperature as load in Thermal Analysis?

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. ## postprocessing of abaqus result file in hyperview

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. ## rms stress and psd elemental stress

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. ## 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. ## 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. ## FRF analysis

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. ## PSD analysis

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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