Author Topic: Weird conclusion of technical paper  (Read 1762 times)

0 Members and 1 Guest are viewing this topic.

Offline CirclotronTopic starter

  • Super Contributor
  • ***
  • Posts: 3362
  • Country: au
Weird conclusion of technical paper
« on: February 22, 2022, 02:31:13 am »
Was reading a paper regarding the effect of failure of the semiconductor switching devices of a 3-phase inverter driving a permanent magnet synchronous motor.
Quote
This paper presents a study of the effects on the power supply quality due to the occurrence of faults in a permanent magnet synchronous motor drive.
https://www.icrepq.com/icrepq-08/288-estima.pdf

The conclusion the authors come to sounds like they totally miss the point from a real world point of view.
Quote
The results obtained and presented in this work show that the occurrence of an open-circuit fault in a transistor of the power converter of a PMSM drive will have a negative impact on the power supply quality. Under these operating conditions, interharmonics will be injected into the supply network which may lead to the need of installing power filters in order to reduce or eliminate them.
I would have thought the best approach would have been to repair the busted drive, not install some sort of filter to bandaid the problem!
 

Offline Someone

  • Super Contributor
  • ***
  • Posts: 5155
  • Country: au
    • send complaints here
Re: Weird conclusion of technical paper
« Reply #1 on: February 22, 2022, 02:41:20 am »
Poorly ranked journal publishes junk content:
https://www.scopus.com/sourceid/21100916460
Just because something is peer reviewed and published doesn't make it good.
 
The following users thanked this post: hans, amyk

Offline amyk

  • Super Contributor
  • ***
  • Posts: 8526
Re: Weird conclusion of technical paper
« Reply #2 on: February 22, 2022, 02:56:07 am »
I've become suspicous of any journal whose name starts with "IC" - seems to be a common name-prefix for all the low quality ones.
 

Offline tooki

  • Super Contributor
  • ***
  • Posts: 13157
  • Country: ch
Re: Weird conclusion of technical paper
« Reply #3 on: February 22, 2022, 07:35:25 am »
I've become suspicous of any journal whose name starts with "IC" - seems to be a common name-prefix for all the low quality ones.
IC means “international conference”, and conference proceedings aren’t peer-reviewed journal articles.

The name of the journal is RE&PQJ.
 

Offline tooki

  • Super Contributor
  • ***
  • Posts: 13157
  • Country: ch
Re: Weird conclusion of technical paper
« Reply #4 on: February 22, 2022, 07:40:49 am »
Poorly ranked journal publishes junk content:
https://www.scopus.com/sourceid/21100916460
Just because something is peer reviewed and published doesn't make it good.
I am SHOCKED that a journal with this website isn’t 100% serious and rigorous!  :-DD

(Not visible in the screenshot: the animation!)
 

Offline Ice-Tea

  • Super Contributor
  • ***
  • Posts: 3229
  • Country: be
    • Freelance Hardware Engineer
Re: Weird conclusion of technical paper
« Reply #5 on: February 22, 2022, 07:42:11 am »
*shrugs*

Might have some value for FMEA.
 

Offline Sal Ammoniac

  • Super Contributor
  • ***
  • Posts: 1764
  • Country: us
Re: Weird conclusion of technical paper
« Reply #6 on: February 22, 2022, 07:51:36 am »
Was reading a paper regarding the effect of failure of the semiconductor switching devices of a 3-phase inverter driving a permanent magnet synchronous motor.
Quote
This paper presents a study of the effects on the power supply quality due to the occurrence of faults in a permanent magnet synchronous motor drive.
https://www.icrepq.com/icrepq-08/288-estima.pdf

The conclusion the authors come to sounds like they totally miss the point from a real world point of view.
Quote
The results obtained and presented in this work show that the occurrence of an open-circuit fault in a transistor of the power converter of a PMSM drive will have a negative impact on the power supply quality. Under these operating conditions, interharmonics will be injected into the supply network which may lead to the need of installing power filters in order to reduce or eliminate them.
I would have thought the best approach would have been to repair the busted drive, not install some sort of filter to bandaid the problem!

Agreed. Their conclusion does sound somewhat ridiculous, but I can attest that the failure of one transistor in a half-bridge of a 3-phase motor inverter won’t prevent the motor from running. This happened to me when the connection to the gate of one of the MOSFETs in my circuit came loose, and much to my surprise the motor kept running, albeit roughly.

Their paper does sound more like an academic exercise than a real-world scenario, however.
"That's not even wrong" -- Wolfgang Pauli
 

Offline amyk

  • Super Contributor
  • ***
  • Posts: 8526
Re: Weird conclusion of technical paper
« Reply #7 on: February 22, 2022, 02:41:28 pm »
Poorly ranked journal publishes junk content:
https://www.scopus.com/sourceid/21100916460
Just because something is peer reviewed and published doesn't make it good.
I am SHOCKED that a journal with this website isn’t 100% serious and rigorous!  :-DD

(Not visible in the screenshot: the animation!)
That looks like typical Indian style.
 

Offline rsjsouza

  • Super Contributor
  • ***
  • Posts: 6106
  • Country: us
  • Eternally curious
    • Vbe - vídeo blog eletrônico
Re: Weird conclusion of technical paper
« Reply #8 on: February 22, 2022, 04:12:44 pm »
Indeed the conclusion is very weird. Given the premise, I would have concluded simply that the analysis indeed showed distortions/harmonics and a possible useful development would be to perhaps detect a fault condition by measuring/logging the behaviour of the sinked current in a real world scenario. 

Since the paper also has some other errors, I don't think it was thoroughly reviewed as well. It may make sense that it could have been presented in a conference or as a simple panel - the latter tends to be even less scrutinized.
Vbe - vídeo blog eletrônico http://videos.vbeletronico.com

Oh, the "whys" of the datasheets... The information is there not to be an axiomatic truth, but instead each speck of data must be slowly inhaled while carefully performing a deep search inside oneself to find the true metaphysical sense...
 

Online Siwastaja

  • Super Contributor
  • ***
  • Posts: 9333
  • Country: fi
Re: Weird conclusion of technical paper
« Reply #9 on: February 22, 2022, 05:26:51 pm »
Typical low-quality junk science. There is a lot of this BS. Need funding -> need to satisfy number of papers requirement -> brainstorm something in the coffee room -> write a paper quickly. The problem isn't (only) in the individuals, it's in the system.

The reason this paper exists is, "Department of Electrical and Computer Engineering" of "University of Coimbra" got some funding (possibly from taxpayers), and J. O. Estima and A. J. Marques Cardoso got paid; not much, but better than being unemployed. Heck, Cardoso has even paid for the IEEE membership, thinking it makes him look more serious!
 

Online hans

  • Super Contributor
  • ***
  • Posts: 1698
  • Country: nl
Re: Weird conclusion of technical paper
« Reply #10 on: February 22, 2022, 06:38:21 pm »
I've become suspicous of any journal whose name starts with "IC" - seems to be a common name-prefix for all the low quality ones.
IC means “international conference”, and conference proceedings aren’t peer-reviewed journal articles.

The name of the journal is RE&PQJ.
Yep. Although most reputable conferences still apply peer review on their proceedings, and some may have an acceptance ratio of only 15%. Some professors even say that being able to publish in those 1-out-of-6-chance conferences is 'worth' more than a journal paper.

Some conferences also have absurdly long papers. I have had to read papers up to 20 pages (each) for my literature study, which in the condensed two-column IEEE format is roughly equal to a masters thesis. The motivation for that goes beyond me, because the density of new information is sometimes really low (e.g. when authors recite basic formulas or show not really relevant figures/tables).

Likewise, this paper follows same tracks as adding a lot of irrelevant details but still not getting to the point IMO.  I've read the introduction of this paper 2 to 3 times to find the reason why it is relevant to research this. I still have no clue.
A lot of the other formulas etc. also seem quite basic, so maybe it was a student project that got transformed into a paper? Some universities also challenge students to write the best paper in class, so they can present it at a national conference. The 2nd author seems to be part of organizing committee of that conference.

It sounds like it is researching what the effects are on throttle response and power output when a 4cyl petrol engine is only running on 3 cylinders. Hypothesis: it will probably start to shake a lot, pick up very badly and have reduced peak output (if it hasn't blown itself up before that).
So.. maybe shut it off and fix it? :-//
« Last Edit: February 22, 2022, 06:44:02 pm by hans »
 

Offline coppercone2

  • Super Contributor
  • ***
  • Posts: 11336
  • Country: us
  • $
Re: Weird conclusion of technical paper
« Reply #11 on: February 25, 2022, 06:45:10 am »
I mean its a good way to keep the power grid running while waiting for replacements..
 
The following users thanked this post: RJSV


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf