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Estimating blade stiffness through sound recording |
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simone
Beginner Joined: 02/03/2018 Location: Rome Status: Offline Points: 14 |
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These works do not threat the subject in the sameway, most of them have a different approach Edited by stiltt - 03/20/2021 at 1:07pm |
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simone
Beginner Joined: 02/03/2018 Location: Rome Status: Offline Points: 14 |
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stiltt
Assistant Admin Joined: 07/15/2007 Location: Location Status: Offline Points: 984 |
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Maybe it's an instance of convergence thinking?
or convergent evolution: if you give them enough time, table tennis players will knock their bare blade's handle on their skull holding the blade's head on the opposite edges with the thumb and middle finger.
Edited by stiltt - 03/20/2021 at 1:15pm |
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simone
Beginner Joined: 02/03/2018 Location: Rome Status: Offline Points: 14 |
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I am talking about this topic, in the explanation of the procedure i read the same words I wrote in the manuscript
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stiltt
Assistant Admin Joined: 07/15/2007 Location: Location Status: Offline Points: 984 |
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Too bad wayback saved the thread only once between 2010 and 2017.
What are the words you are referring to?
Edited by stiltt - 03/20/2021 at 2:02pm |
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simone
Beginner Joined: 02/03/2018 Location: Rome Status: Offline Points: 14 |
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I opened a thread with the same subject in an italian forum years ago ok is in italian, but... same questions, same answers... same numbers.... what a coincidence.. |
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thejnal
Beginner Joined: 05/31/2021 Location: czech republic Status: Offline Points: 10 |
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Im am physics teacher. The measuring makes no sence. The frequency depends eg on where you hold the bat or where you hit it. The stiffness has nothing to do with frequency. Sorry. |
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arg0
Platinum Member Joined: 07/22/2009 Location: Germany Status: Offline Points: 2023 |
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Have you actually tried? You would be surprised: the dependency you talk about is minimal for the main frequency. Just keep your grip loose.
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Hipnotic
Silver Member Joined: 09/30/2019 Location: Portugal Status: Offline Points: 771 |
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I'm no teacher, but one thing I know is that when we are conducting an experiment, a set of ground rules must be established, in order to control the variables and produce results that can be comparable with each other. There were so many arguments you could've made, but managing where and how you hit the blade are the easiest ones to control, so they aren't gonna be the reason to invalidate this test. By the way, have you tried to measure this variation yourself? Because I can tell you it won't be much.
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Zwill
Super Member Joined: 11/10/2017 Location: Hungary Status: Offline Points: 174 |
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It's quite scary how similar blades measure almost identical. I have a TBS black tag, Yinhe V14pro and a Yinhe D715 which is all very similar blade and they all measure around 1425-1450hz, their manufacturing year, weight handle are different but they measure the same.
But I wouldn't give too much thought to the test either, it's good for a general idea I think. Like above mentioned blades measure 1425hz+, but my Joola Trinity only measures "only" 1400hz. However the Trinity is significantly stiffer and faster in actual play. An 1300hz Fang Bo carbon doesn't feel only 7-8% slower, it's much much slower and flexier.
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arg0
Platinum Member Joined: 07/22/2009 Location: Germany Status: Offline Points: 2023 |
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Besides, I had given for granted that you were questioning the blade being hold by hand and the variable contact point. As to the overall approach, there are several scientific publications on the subject, where the blade is clamped. The latest I am aware of are by Manin et al in Proc. Conf. International Sports Engineering Association (ISEA), but I have not kept up to date.
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cole_ely
Premier Member Joined: 03/16/2005 Location: United States Status: Offline Points: 6895 |
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from a statistical standpoint, I would think you might want to get a good number of bounces recorded for analysis. A good algorithm would have you it remove your hand and re grab the blade, then bounce it a few times and repeat the process; then take averages or whatever. Seems like it would be more realistic than trying to find a standard clamp. You will be holding the blade in your hand with a lot of variation as you play
Edited by cole_ely - 06/15/2021 at 9:21pm |
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Wavestone St with Illumina 1.9r, defender1.7b
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simone
Beginner Joined: 02/03/2018 Location: Rome Status: Offline Points: 14 |
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I am an egineer trust me ... try it, try to repeat the test few times and compare the outcome (should be about the same), and with the feeling when using that blade. should not hit the ball on the edge of the blade, (as when when you play). Obviously it is not a laboratory test, but reliable for the purpose. just for curiosity, give a look at the video and I found the test easy to make and useful Edited by simone - 09/18/2021 at 5:11am |
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