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tec-science
Germany
Приєднався 16 гру 2021
I am an engineer by profession and teach mechanical engineering and physics at a vocational school. In my free time I like to create 3D animations, even though I'm not a professional at it. This UA-cam channel is the logical result of combining my profession and my hobby. Have fun with it.
On my channel you will find all kinds of stuff about mechanical engineering and physics for study, school and work.
The images and animations shown in the videos are almost exclusively generated with the 3D-software Blender. Therefore, the images and animations do not claim correctness of the illustrated contents.
Feel free to share the videos, but do not upload them to other platforms without first asking for consent.
Disclaimer: www.tec-science.com/disclaimer
On my channel you will find all kinds of stuff about mechanical engineering and physics for study, school and work.
The images and animations shown in the videos are almost exclusively generated with the 3D-software Blender. Therefore, the images and animations do not claim correctness of the illustrated contents.
Feel free to share the videos, but do not upload them to other platforms without first asking for consent.
Disclaimer: www.tec-science.com/disclaimer
Why do crowned pulleys keep a flat belt on track?
In this video, we answer the question of why a convex curvature of the pulley keeps the belt on track. At first glance, this may seem paradoxical, as one would intuitively assume that such a convexity would cause the belt to run off the pulley. In fact, the opposite is true - the belt centers itself on the pulley and is kept on track.
If the belt is not centered on the pulley, the two sides are tensioned differently. The side of the belt that is closer to the center of the pulley is tensioned more than the opposite side. This difference in tension results in the two sides of the belt no longer running in a straight line, but curving towards the more tensioned side.
In this way, the belt curves itself upwards towards the center of the pulley. Thus, due to its curvature, the belt gradually pulls itself up towards the center of the pulley as it runs around the pulley.
As long as the belt is not centred symmetrically in the middle of the pulley, the more tensioned side will continue to bend upwards and thus pull further and further upwards. This effect only disappears when the belt is positioned symmetrically in the middle of the pulley and both sides of the belt are equally tensioned. In this case, there is no curvature and the belt does not pull in any direction. This leads to the self-centring effect of the crowned pulleys and prevents the belt from running off the pulley.
00:00 Why are pulleys curved (crowned pulleys)?
01:04 Illustration with a rubber band
01:24 Self-centering effect
If the belt is not centered on the pulley, the two sides are tensioned differently. The side of the belt that is closer to the center of the pulley is tensioned more than the opposite side. This difference in tension results in the two sides of the belt no longer running in a straight line, but curving towards the more tensioned side.
In this way, the belt curves itself upwards towards the center of the pulley. Thus, due to its curvature, the belt gradually pulls itself up towards the center of the pulley as it runs around the pulley.
As long as the belt is not centred symmetrically in the middle of the pulley, the more tensioned side will continue to bend upwards and thus pull further and further upwards. This effect only disappears when the belt is positioned symmetrically in the middle of the pulley and both sides of the belt are equally tensioned. In this case, there is no curvature and the belt does not pull in any direction. This leads to the self-centring effect of the crowned pulleys and prevents the belt from running off the pulley.
00:00 Why are pulleys curved (crowned pulleys)?
01:04 Illustration with a rubber band
01:24 Self-centering effect
Переглядів: 863
Відео
Warum halten gekrümmte Riemenscheiben einen Flachriemen in der Spur?
Переглядів 1,1 тис.3 місяці тому
In diesem Video gehen wir der Frage nach, warum eine konvexe Wölbung der Riemenscheibe den Riemen in der Spur hält. Dies mag auf den ersten Blick paradox erscheinen, da man intuitiv annehmen würde, dass eine nach außen abfallende Wölbung den Riemen von der Scheibe ablaufen lässt. Tatsächlich ist aber genau das Gegenteil der Fall, der Riemen zentriert sich auf diese Weise selbst auf der Riemensc...
Calculation of the belt length and bearing force | Derivation of the formulas
Переглядів 8974 місяці тому
In this video, we derive the formula for calculating the belt length and the bearing force for belt drives. When designing belt drives, it is necessary to determine the required belt length for a given pulley diameter and pulley distance. The basis for calculating the belt length is the mounted state of the belt on the pulleys. We also derive the formula for calculating the bearing force. The f...
Berechnung der Riemenlänge und der Lagerkraft | Herleitung der Formeln
Переглядів 5774 місяці тому
In diesem Video leiten wir die Formel zur Berechnung der Riemenlänge und der Lagerkraft für Riemenantriebe her. Für die Auslegung von Riementrieben ist es notwendig, die erforderliche Riemenlänge bei gegebenen Scheibendurchmessern und Scheibenabständen zu bestimmen. Grundlage für die Berechnung der Riemenlänge ist der aufgezogene Zustand des Riemens auf den Scheiben. Ebenfalls leiten wir die Fo...
Types of belts | Flat belts | V-belts | Advantages & disadvantages
Переглядів 9224 місяці тому
This video takes a closer look at the different belt types and their application, as well as their respective advantages and disadvantages. Flat belts are characterized by very high belt speeds of up to 100 meters per second. However, the power that can be transmitted is not very high. The transmission ratio is in the range of maximum 15. A major disadvantage of flat belts is the very high slip...
Arten von Riemen | Flachriemen | Keilriemen | Vor- & Nachteile
Переглядів 8674 місяці тому
In diesem Video werden die verschiedenen Riementypen und ihre Anwendung sowie die jeweiligen Vor- und Nachteile näher betrachtet. Flachriemen zeichnen sich durch höchste Riemengeschwindigkeiten von bis zu 100 Meter pro Sekunde aus. Die übertragbare Leistung ist jedoch nicht sehr hoch. Das Übersetzungsverhältnis liegt im Bereich von maximal 15. Ein wesentlicher Nachteil von Flachriemen ist jedoc...
How does a cycloidal gearbox work? | Structure and function simply explained | parametric equation
Переглядів 4,2 тис.4 місяці тому
In this video, we will look at the structure and working principle of a cycloidal gear. A cycloidal gear is generally used for precise control of moving parts of robots. In this type of transmission, the cycloidal disc is driven by an eccentric shaft. Fixed roller pins are arranged in a circle around the eccentric shaft into which the cycloidal disc engages. As the eccentric shaft rotates, the ...
Wie funktioniert ein Zykloidgetriebe? | Aufbau und Funktionsweise einfach erklärt
Переглядів 2 тис.4 місяці тому
In diesem Video beschäftigen wir uns mit dem Aufbau und dem Funktionsprinzip eines Zykloidgetriebes. Ein Zykloidgetriebe wird in der Regel zur präzisen Steuerung beweglicher Teile von Robotern eingesetzt. Das Herzstück des Zykloidgetriebes ist die Kurvenscheibe (Zykloidenscheibe). Diese wird von einer Exzenterwelle angetrieben. Um die Exzenterwelle sind ringförmig feststehende Bolzen angeordnet...
Calculation of the elastic slip for belt drives
Переглядів 5864 місяці тому
In this video we take a closer look at the slip of a belt in belt drives. We will determine the slip as a function of the transmitted circumferential force and the elasticity of the belt material. Slip is caused by the stretching of the belt as it runs around the pulleys and is therefore referred to as elastic slip. It should be noted that the elastic slip does not occur over the entire wrap an...
Berechnung des Schlupfs bei Riementrieben (Dehnschlupf von Riemen)
Переглядів 5104 місяці тому
In diesem Video wird der Schlupf eines Riemens in Riementrieben näher betrachtet und in Abhängigkeit von der übertragenen Umfangskraft und der Elastizität des Riemenwerkstoffs bestimmt. Der Schlupf entsteht durch Dehnungsvorgänge des Riemens beim Umlauf um die Riemenscheibe und wird daher auch als Dehnschlupf bezeichnet. Dabei ist zu beachten, dass der Dehnschlupf nicht über den gesamten Umschl...
Optimum belt speed of a belt drive | Transmission of maximum power
Переглядів 5674 місяці тому
In this video, we take a closer look at the stresses that occur in the belt of a belt drive and the resulting consequences for the optimum belt speed. Increasing the belt speed will reduce the maximum transmittable circumferential force, as otherwise the centrifugal force would place an unacceptably high load on the belt! The transmittable power will therefore decrease at very high belt speeds!...
Optimale Riemengeschwindigkeit eines Riementriebs | Übertragung maximaler Leistung
Переглядів 3874 місяці тому
In diesem Video betrachten wir die im Riemen eines Riementriebs auftretenden Spannungen und die sich daraus ergebenden Konsequenzen für die optimale Riemengeschwindigkeit näher. Steigende Riemengeschwindigkeiten führen zu einer Verringerung der maximal übertragbaren Umfangskraft, da sonst die Fliehkraft den Riemen unzulässig stark belastet! Die übertragbare Leistung sinkt also bei sehr hohen Ri...
Centrifugal forces on the belt of a belt drive | derivation of the centrifugal belt forces
Переглядів 5064 місяці тому
At high belt speeds, significant centrifugal forces act on the belt sections rotating around the pulley. These centrifugal forces pull the belt outward and try to lift it off the pulley. As a result, the contact force and thus the frictional force between the belt and the pulley decreases. In the case of high centrifugal forces, the frictional force may not be sufficient to transmit the require...
Fliehkräfte am Riemen eines Riementriebs | Herleitung der Riemenfliehkraft
Переглядів 2424 місяці тому
Bei hohen Riemengeschwindigkeiten wirken erhebliche Fliehkräfte auf die um die Riemenscheibe laufenden Riemenabschnitte. Diese Fliehkräfte ziehen den Riemen nach außen und versuchen ihn sozusagen von der Scheibe abzuheben. Dadurch verringert sich die Anpresskraft und somit die Reibungskraft zwischen Riemen und Riemenscheibe. Bei hohen Fliehkräften kann dies dann dazu führen, dass die Reibungskr...
Power transmission in belt drives: Basics and calculations | Elastic & sliding slip
Переглядів 9064 місяці тому
In this video, you will learn everything you need to know about power transmission in belt drives. We explain the theoretical basics and guide you through the most important calculations and concepts that are necessary for the understanding and practical application of belt drives. 00:00 Static equilibrium 01:56 Dynamic equilibrium 03:37 Increasing the circumferential force 05:05 Yield factor 0...
Kraftübertragung am Riementrieb: Grundlagen und Berechnungen | Gleit- und Dehnschlupf
Переглядів 7284 місяці тому
Kraftübertragung am Riementrieb: Grundlagen und Berechnungen | Gleit- und Dehnschlupf
How does an RV speed reducer work? | Structure and function simply explained | Transmission ratio
Переглядів 8105 місяців тому
How does an RV speed reducer work? | Structure and function simply explained | Transmission ratio
Wie funktioniert ein RV-Getriebe? | Aufbau und Funktion einfach erklärt | Übersetzungsverhältnis
Переглядів 6785 місяців тому
Wie funktioniert ein RV-Getriebe? | Aufbau und Funktion einfach erklärt | Übersetzungsverhältnis
Belt friction equation | derivation of the Euler-Eytelwein formula | problems & solutions
Переглядів 7315 місяців тому
Belt friction equation | derivation of the Euler-Eytelwein formula | problems & solutions
Seilreibungsgleichung | Herleitung der Euler-Eytelwein-Formel | Aufgaben & Lösungen
Переглядів 4575 місяців тому
Seilreibungsgleichung | Herleitung der Euler-Eytelwein-Formel | Aufgaben & Lösungen
Wie funktioniert ein Riementrieb? (Gleitschlupf | Dehnschlupf | Zugtrum (Lasttrum) | Leertrum)
Переглядів 2 тис.6 місяців тому
Wie funktioniert ein Riementrieb? (Gleitschlupf | Dehnschlupf | Zugtrum (Lasttrum) | Leertrum)
How does a belt drive work? (sliding & elastic slip easily explained | slack side | tight side)
Переглядів 3 тис.6 місяців тому
How does a belt drive work? (sliding & elastic slip easily explained | slack side | tight side)
What is a rotary lobe pump and how does it work? (Roots-type supercharger simply explained)
Переглядів 7996 місяців тому
What is a rotary lobe pump and how does it work? (Roots-type supercharger simply explained)
Wie funktioniert ein Drehkolbenverdichter? (Drehkolbenkompressor, Drehkolbenpumpe, Kreiskolbenpumpe)
Переглядів 8356 місяців тому
Wie funktioniert ein Drehkolbenverdichter? (Drehkolbenkompressor, Drehkolbenpumpe, Kreiskolbenpumpe)
Triebstockverzahnung als Spezialfall einer Zykloidenverzahnung
Переглядів 6226 місяців тому
Triebstockverzahnung als Spezialfall einer Zykloidenverzahnung
Lantern pinion as a special case of cycloidal gear
Переглядів 8026 місяців тому
Lantern pinion as a special case of cycloidal gear
Zykloidenverzahnung (Konstruktion einer Epizykloide & Hypozykloide, Vorteile, Nachteile)
Переглядів 1,3 тис.6 місяців тому
Zykloidenverzahnung (Konstruktion einer Epizykloide & Hypozykloide, Vorteile, Nachteile)
Cycloidal gears (construction of an epicycloid & hypocycloid, advantages, disadvantages)
Переглядів 3 тис.6 місяців тому
Cycloidal gears (construction of an epicycloid & hypocycloid, advantages, disadvantages)
Calculation of involute gears (center distance, profile shift, pressure angle, etc.)
Переглядів 2,5 тис.6 місяців тому
Calculation of involute gears (center distance, profile shift, pressure angle, etc.)
Berechnung von Zahnrädern (Evolventenverzahnung, Achsabstand, Profilverschiebung, Eingriffswinkel)
Переглядів 1,6 тис.6 місяців тому
Berechnung von Zahnrädern (Evolventenverzahnung, Achsabstand, Profilverschiebung, Eingriffswinkel)
THANKS
why N=mgaz/m
8:26 to 11:08 Can you explain whether the perceived brightness of an object changes as you move the detector along the hemisphere? As you stated, the projected area of the small emitting plate changes when you move along the hemisphere, but how does that translate to a decrease in brightness when the spectral flux is constant for each point on the hemisphere? Surely the brightness should be independent of the angle at which you are viewing the flat emitting plate from if the spectral flux is constant along the hemisphere?
Danke
Arrow comes in contact with circle 3 times, not 4.
As already mentioned in the video, this only applies to a co-rotating reference system. For an outside (stationary) observer, it is 4 revolutions. This is known as the coin rotation paradox. There are countless videos that solve this comprehension problem.
@@BardKI That's a bogus answer.
Very nice graphical illustration! Thank you so much.
Thank you!
U PUT SO MUCH EFFORT IN UR VIDEOS AND THEY PAY OFF ASWELL THANKS FOR UR EFFORTS
I appreciate that!
You have changed the way of teaching. So detailed and very clear to understand
Thank you!
Ein wirklich sehr schönes und lehrreiches Video👍
Vielen Dank!
😍😍😍😍😍
Super dargestellt und Erklärt. Jetzt hab ich’s auch!
As an engineer working at mechanical engineering faculty I give all the kudos I can for beautiful presentation and explanation! Keep up the great work. P.s just gave lessons in Euler-Eytelweil formula this week and from now on will recommend this video to all of my students!
Super
Eure videos sind einfach perfekt. Danke
Is there a book for this specific topic?
Nice video....needed to refresh my memory from materials science class because now I need a hardness tester at work
Dieses Video ist Lehrmaterial der TLS Gießen
Excellent video, thank you for sharing such knowledge rich content. God bless you.
sehr aufschlussreiches Video!
Toll
Top Videos, gerne auch mehr zu Schrauben/Lagerberechnung
Zum allgemeinen Thema der Lagerberechnung habe ich bereits auf meinen anderen Kanal (von dem aus ich gerade schreibe) etwas dazu hochgeladen. Dort werde ich dann wahrscheinlich auch demnächst etwas zu den Lagerarten/Lagerarten (also Wälzlager) machen. Am besten auch diesen Kanal abonnieren, dann bleibst du auf dem Laufenden.
@ Sehr cool, gut zu wissen :)
Das Video ist ja mal sowas von klasse
Ihr seid die besten
Danke, freut mich zu hören. Ich gebe mein bestes.
Nice video 🥰🔥🔥
Really interesting
Honestly needs more views! very good explanation and comparison!
Tolles Video, aber was ist mit den Freiheitsgraden in Flüssigkeiten?
Great video. Thanks!
Also die ganze Playlist ist super animiert, gut aufgebaut sowie sachlich und anschaulich erklärt. War anfangs etwas abgeschreckt von der computergenerierten Stimme but boy was i wrong.. ❤ Das macht die Vorlesungen so viel verständlicher.
Vielen Dank. Ja das Problem mit der Stimme ist mir bekannt. Wenn ich Zeit habe werde ich die ganzen Videos mal neu vertonen.
Ya hice un resumen que me encargaron en la uni, estaría bien que estuviera en español ya que i don't speak inglish
Amazing explanation in details ....Great, may I request you to make a detailed lecture on Iron Silicon phase diagram please and also detailed information about non oriented electrical steels and grain oriented electrical steels....Thank you so much in advanvce
What an amazing video, best wishes
I'm very lucky to have found this channel, thank you for your generousity to share valuable knowledge. I have a question and wonder if someone could enlight me. Considering a gear train system, for ex. 3 gears. If the first two gears are design with profile shift, making an operating pressure angle, say 30deg, differed from the standard pressure angle--20deg(from gear cutter). Is it required that the rest of the gears in the system, for ex. the 3rd gear, be designed with the same operating pressure angle? or the rest of the gears can be designed with any arbitary working pressure angles as long as the base pitch is the same with all gears for them to mesh. Thank you!
The 3rd gear in your example does not need to share the same operating pressure angle as the first two, provided that you use the same gear cutter with the same standard pressure angle of 20° while manufacturing! You will find more information in the linked video: ua-cam.com/video/RgMSsQApYIk/v-deo.html
@@tec-science Thank you. I now understand that the gears with the same maunufacturing pressure angle can be meshed at different center distances, resulting in different operating pressure angles.
mega video, ich habe sehr vermisst, dass sie am ende noch das gefüge bei gusseisen graphisch darstellen
Of course, none of this is true for the non-greenhouse gases, N2 and O2, which make up 99 % of the atmosphere. They do not absorb or emit IR, thermal radiation.
“Simply explained” 😂😂😂
Danke für die gute und anschauliche Erklärung! :)
Sehr gerne!
Sehr gutes Video, danke
Best explanation ❤❤
top!
Is the cycloidal stage gear ratio correct? What you say and what the formula shows is different?
What time in the video are you talking about?
@@tec-science 4:28 I'm just confused about the gear ratio as a whole because it's not aligning with what I've built. For the pins to make 1 full revolution, you say that the crank shaft needs to make 20 revolutions, but with that setup (making the pins as the output), the cycloidal formula should be n/(N-n) for the overall gear ratio to be correct. If the pins are stationary, the overall formula is correct, but the rotations of the crank shaft become 19 to 1 revolution of the planetary gears around the input shaft. I guess in summary, I'm unsure where the formula changes depending on which you make the output (planet carrier or pins) because the gear ratios are different according to my experimental setup.
@@tec-science Nice video by the way. It's hard to find information about these kinds of things that's easily digestable. First came across this kind of transmission from a video by Michael Rechtin.
You may find some answers in this link:: www.diva-portal.org/smash/get/diva2:532489/FULLTEXT01.pdf
Great video overall, but its was a bit hard to keep track of the names for the components, maybe you could indicate what component you are talking about by marking it in the video?
I totally agree. I've been thinking about doing a new version. I will keep your words mind.
this video very helpful thanks for upload plz upload in English
This video is already uploaded in english. Search for geometry of involute gears on my channel.
Today I learned that the arithmetic mean speed is greater than the root mean square speed, which is greater than the most probably speed!
From 9th C hitec
At 3:52 I think it should be Center of Mass instead of Center of Gravity
JETZT habe ich es begriffen! Vielen Dank ;)
Hervoragend , bitte noch mehr. Danke
the use of the word ''density'' just confuses me, making me think it says the same amount of water magicaly gains more matter/weight. should it better be called ''compactness''?
I can understand the confusion, but density is the correct technical term and is always used in this context. Compactness would certainly not be wrong in everyday language either.
Great video