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Пікірлер
@BasitKhan-te4ls 4 күн бұрын
Can we find the damping ratio of helical spring using harmonic analysis in ansys?
@_LusitaSimbolon 6 күн бұрын
thank you, very good video!
@vincentlemoine3830 Ай бұрын
I'm not sure why KZfaq recommended me this video, but it was great !
@cCaRloSs7 Ай бұрын
Is neccesary to add an hysteresisi filter if the signal will be filtered with the peak valley method? Or there are signals that might need both procceses as the complexity is higher? Can other filters be added instead of the hysteresis filttering?
@HolgerZeinert Ай бұрын
The hysteresis filter is used to remove small cycles. We do it always with at least the size of 1 bin width. So, all cycles that are smaller than 1 bin width are ignored. The peak valley filtering mentioned in the video will remove monotonic parts between turning points. Without the hysteresis filter there would be much more turning points and you would end up with cycles on the main diagonal. These would be cycles with a reference amplitude of zero (after the binning). So, it does not make much sense in keeping them with respect to damage. Other filters can be applied in time domain before doing the Rainflow counting, but they are not embedded in the Rainflow counting algorithm as we have implemented it. But be careful with applying filters that modify the amplitude: this will modify the damage!
@kurniawijayakusuma9193 2 ай бұрын
sir, how to determine the hours of 1 cycle?
@SimcenterTesting 2 ай бұрын
Cyclic fatigue is independent of time. Any stress cycle could be applied slowly or quickly. In the end, the number of complete cycles applied is what matters. If cycles in real life usage are applied quickly, the part will fail faster than if they are applied slowly over time.
@kurniawijayakusuma9193 2 ай бұрын
@@SimcenterTesting so is it means, I need to know the value of time during the stress cycle? If I want to convert the cycles to time?
@Nicho2020 2 ай бұрын
Very informative - thank you!
@bapurautray 2 ай бұрын
Thanks for sharing! Very clearly explained the difference between sound power and pressure 👌
@siddharthparmar3284 2 ай бұрын
Would this still give accurate displacements for impulses in the data? If I drive over multiple small bumps and measure acceleration, would I be able to accurate determine the height of the bump?
@user-vv2yc9vo5k 2 ай бұрын
as shown at 2:24 from where to get the ductility and strength coefficient and exponents of material if we have to add new material?
@user-dr8yw7lf8t 2 ай бұрын
Hello, I'd like to ask about the software. I'm using LMS Testlab now. What is the different between Testlab and Testlab Neo? And Is it possible to calculate psychoacoustic tonality in LMS Testlab? Thank you and look forward to your reply
@SimcenterTesting 2 ай бұрын
Neo has an updated user interface compared to Testlab ""Classic" which is faster to use for many tasks. There is a lot of overlap in functionality between Neo and Testlab, and some newer features in Neo. Here is some more information on Simcenter Testlab Neo: community.sw.siemens.com/s/article/Simcenter-Testlab-Neo-Introduction
@SimcenterTesting 2 ай бұрын
For Tonality - Classic tonality which has a range of 0 (no tones) to 1 (very tonal) is in Testlab. Tonality HMS which goes from 0 to beyond 1 also by considering the loudness level is available in Simcenter Testlab Neo: community.sw.siemens.com/s/article/Tonality
@manjhiman8351 2 ай бұрын
28:34 where have you guys defined the other natural frequencies and whole curve for other systems so, how does this spectrum come without specifying these parameters
@SimcenterTesting 2 ай бұрын
28:37 - it is actually a single slope linear approximation of the Whoeler curve (Basquin law N σ^b=A^b). The natural frequencies are defined by the “frequency axis parameters”. For this analysis and for SRS calculations, there is a subtle but important difference between the two, as pointed out in the articles community.sw.siemens.com/s/article/Fatigue-Damage-Spectrum and community.sw.siemens.com/s/article/shock-response-spectrum-srs
@manjhiman8351 2 ай бұрын
How did you define the no. Of systems and their natural frequencies for an example if DUT is a bicycle then : 1. Is all the bicycle component will be counted as different system where SDOF model will be applied to each and every system (bicycle components) and similarly the natural frequency of all those components as well as there SN curve will be u still see to find the FDS curve Are my above assumptions correct or please suggest the correct assumption
@SimcenterTesting 2 ай бұрын
Do not confuse the SDOF systems with the natural frequencies of the test object. Mission Synthesis goal is to derive the input to a test article whose resonant frequencies are unknown. FDS uses for this scope a generalized resonance model under the assumption that (unknown) resonances ultimately lead to fatigue failure. Frequency spacing limits are often suggested by standards (e.g min xx points per octave), but I find a good practice for defining the frequency spacing to quickly analyze the frequency content of the input events upfront to make sure I am not cutting out input energy. For example, if the input signals show a clear sharp peak at around 4 Hz, a 2 Hz resolution starting at 1 Hz will lead to [1,3,5, …] Hz frequency axis which will result in an interpolated value at the critical 4 Hz frequency. It would be better to start at 1 Hz and define a 1 Hz resolution (or at 2 Hz with a 2 Hz resolution, for the sake of this example).
@DDDelgado 3 ай бұрын
14:00 why pseudo velocity is the one to use
@SimcenterTesting 2 ай бұрын
Suggest reading section 4.5 of this article: community.sw.siemens.com/s/article/shock-response-spectrum-srs
@picypug 3 ай бұрын
Can i use this parameters to compute power (in dB) from a EEG - specific band over time ?
@baghdadiabdellatif1581 3 ай бұрын
The software can do IIR filter? And mathematic codes?
@baghdadiabdellatif1581 3 ай бұрын
Nice. What about 30Hz 90Hz 150Hz amplitude and phase response?
@baghdadiabdellatif1581 3 ай бұрын
The software can read wave files and numpy files?
@stevexiao1488 4 ай бұрын
Very informative. Lady has a beautiful voice. Thank you.
@charantejaramenani8188 4 ай бұрын
How unc. Factor and test factor effect the final PSD.
@Trimmdeuns 4 ай бұрын
very good video. Pls how do we calculate the remaining life of a part if given that different loads were applied and different numbers of cycles generated?
@anilkumar-vh4tp 5 ай бұрын
how did you decided the length of the hystereis gate?
@HolgerZeinert 5 ай бұрын
In our software, the minimum gate is 1 bin width. This will avoid cycles on the main diagonal which would have a reference physical range of 0. This would not add to the damage anyway. You can use larger gates, then this value should relate to the endurance limit of the material you are measuring/testing. So, the gate should only exclude cycles where you are super sure that they will not add to your damage.
@georgevarghese2177 5 ай бұрын
why is the damping ratio different for all peaks. damping ratio for a material should be same .
@SimcenterTesting 5 ай бұрын
In a dynamic mode of a structure, modes that occur at different frequencies can be local to smaller components of the structure. These components can be made of different materials, have different boundary conditions, or the material is not uniform throughout the structure.
@rkramakrishna8566 5 ай бұрын
How can we save report in word file?
@SimcenterTesting 5 ай бұрын
File -> Printing Options -> Default Microsoft Application set to Microsoft Word.
@Chsojdksd 5 ай бұрын
7:08 why?only inner counted?
@HolgerZeinert 5 ай бұрын
Only the inner points build a closed hysteresis loop in the stress/strain path. To close the cycle built by the inner points, you need the outer points. Later, the outer points might become inner points of some larger points. Then they are counted as well.
@sandifaruq 6 ай бұрын
Thank you!
@ef7388 6 ай бұрын
This is why I do not loan my equipment to others!
@ef7388 6 ай бұрын
Excellent presentation !
@user-co6no7td4i 6 ай бұрын
Thank you so much. Is there any code for these theories?
@zameerahmed1775 6 ай бұрын
Are u from Siemens ?
@dgzjdgjz8487 6 ай бұрын
Are Auto power spectrum and cross power spectrum types of Fourier transform representation
@SimcenterTesting 6 ай бұрын
An autopower is based on the fourier transform, but it is squared to remove phase: community.sw.siemens.com/s/article/the-autopower-function-demystified. Both a Fourier Transform and a Autopower are typically calculated based on a single signal. A cross power is frequency function calculated between two separate signals.
@joolee7952 6 ай бұрын
11:30
@user-km2uw4su2n 7 ай бұрын
Hi!! We're doing a modal test using 6061 aluminum shallow plate(15cm x 8cm) . We've attached 12 accelerometers on the plate, and fixed one edge of the plate to the vibration shaker. We're trying to find the 'response characteristics' of three different cases. 1. modal test using only impact hammer 2. random test using only vibration shaker 3. random test using only vibration shaker (condition : the fixed bolts of the vibration shaker is a little bit loosened) can you guess the reason why there are response characteristic differences? plus, do you think there's an algorithm to testify loosened bolts?
@davidegalli1724 7 ай бұрын
grazie bro
@dominiker4601 7 ай бұрын
Really amazing with good humor. Thanks guys
@ogbodocollinsjnr.3412 8 ай бұрын
Great video, really insightful... thank you
@sanskarsharma9494 9 ай бұрын
Great Video 😊
@julieballard7581 9 ай бұрын
Finally! A presentation on torsional vibration that helps me visualize the vibration. It's easy to imagine bending frequencies, but not vibration caused by torsional forces. 👍
@jihopark1020 9 ай бұрын
Thank you so much
@jihopark1020 9 ай бұрын
Thanks
@asairohit1 9 ай бұрын
Thanks, really helped !!
@Oneness100 9 ай бұрын
Something that I have noticed is that for an absorption material, there are different applications which might require a different absorption coeffient curve than another material Example. For critical music/speech listening environment, we have a hearing curve which is not a flat curve, and I've noticed that some materials that have an absorption curve that is closer matched to hearing curves that they sound better than other materials for these types of applications. That's why I stay away from building materials like fiberglass (compressed or non-compressed), or mineral wool. Also, open cell foams have different cell structure and density so there are differences in open cell foams too. Another material that isn't discussed is activated carbon, it's highly porous and very dense material, but it comes in typically pellet forms and there's a wide variety of different types of activated carbon on the market. I did notice one company mfg's their own activated carbon and they use it as a fill material inside a pressure based diaphragmatic absorbing products more for the low frequencies down to 30hz. I read a Salford University study on using Activated Carbon for low frequency absorption.
@user-ps8fi5zq8b 10 ай бұрын
On what basis did you select reference points? Is it possible to somehow do without them?
@surebow7270 10 ай бұрын
Is there a sample time series I can use to test my code with?
@melihcanozdemir7309 10 ай бұрын
Can i do it with composite?
@LujoSey 11 ай бұрын
In real world how do you make sense of these sound pressure levels say to determine if an equipment if acceptable eg a fan. I usually get sound power (LWA) from manufacturer and it really does not make sense to me especially when there's no distance specified from the source eg 45dBA at 1m
@SimcenterTesting 11 ай бұрын
Given a sound power value, the sound pressure/sound intensity can be determined at given distance from the source as explained in section 3.2 of this article: community.sw.siemens.com/s/article/sound-pressure-sound-power-and-sound-intensity-what-s-the-difference. Sound pressure and sound intensity levels are the same if the sound emitting object is in a free field.
@dinhvanduc4539 11 ай бұрын
Excellent! Thank you very much!
@edokorn7919 11 ай бұрын
Excellent explanation of Sound Power applications.
@mohamedeldin2744 Жыл бұрын
thank you very much Raji for the video, very good explanation, I have a question you draw the rainflow diagram with to and from the load what do you mean? normally one plots the rainflow with mean stress vs amplitude stress, and the amplitude stress is always positive
@SimcenterTesting Жыл бұрын
This article has some more explanation: community.sw.siemens.com/s/article/difference-between-range-mean-and-from-to-cycle-counting
@mohamedeldin2744 Жыл бұрын
@@SimcenterTesting thank you very much, it is a good point to know the load direction because I work in Electric machine and I do a lot rainflow analysis, it is nice to know if this load is from Generator to Motor or vice versus (accleration or recurperation)