This document provides an overview of teaching gear theory concepts to students for FIRST Lego League and FIRST robotics competitions. It discusses various gear types like spur gears, bevel gears, worm gears and differentials. Key concepts covered include gear terminology, identification, properties, geometry, ratios and analysis. Examples of proper and improper gear meshing are also presented.
gear theory which can help to a engineering student to understand the mechanism of gear manufacturing ,working ,and many more /how a gear changes by pressuring on a badle it is also explain in it the workability of a gear is also described
gear theory which can help to a engineering student to understand the mechanism of gear manufacturing ,working ,and many more /how a gear changes by pressuring on a badle it is also explain in it the workability of a gear is also described
Discussion Map
Gears are toothed, cylindrical wheels used for transmitting motion and power from one rotating shaft to another.
Most gear drives cause a change in the speed of the output gear relative to the input gear.
Some of the most common types of gears are spur gears, helical gears, bevel gears, and worm/worm gear sets.
this project is design of bevel gear box
A Gearbox is a device that used for transmitting power from the Power source to
the output shaft. A gearbox has a set of gears that are enclosed in a casing. The gears are
mounted on shafts which rotate freely about their axis
The project presents a two speed transmission. Design requirements for the transmission state that it must have two forward gears and two reverse gears, be compact, be quiet, and have a collinear design. Also, the design must last for 1600 hours at each gear for a combined life of 6400 hours between 750 and 1250 rotations per minute (RPM) with a power input of 32 horsepower. The output shaft must rotate at 85% (±1%) and 65% (±1%) of the input speed in the input direction, and 60% (±1%) and 50% (±1%) of the input speed in the opposing direction. The design chosen consists of an input shaft, counter shaft, idler shaft, and an output shaft assemblies which were all designed using helical gears, tapered roller bearings, and radial ball bearings. Validation of the gears, bearings, and shafts were done using RomaxDesigner software. Analysis of the duty cycle summary for the final design shows design failure shortly after the required combined life of 6400 hours.
Discussion Map
Gears are toothed, cylindrical wheels used for transmitting motion and power from one rotating shaft to another.
Most gear drives cause a change in the speed of the output gear relative to the input gear.
Some of the most common types of gears are spur gears, helical gears, bevel gears, and worm/worm gear sets.
this project is design of bevel gear box
A Gearbox is a device that used for transmitting power from the Power source to
the output shaft. A gearbox has a set of gears that are enclosed in a casing. The gears are
mounted on shafts which rotate freely about their axis
The project presents a two speed transmission. Design requirements for the transmission state that it must have two forward gears and two reverse gears, be compact, be quiet, and have a collinear design. Also, the design must last for 1600 hours at each gear for a combined life of 6400 hours between 750 and 1250 rotations per minute (RPM) with a power input of 32 horsepower. The output shaft must rotate at 85% (±1%) and 65% (±1%) of the input speed in the input direction, and 60% (±1%) and 50% (±1%) of the input speed in the opposing direction. The design chosen consists of an input shaft, counter shaft, idler shaft, and an output shaft assemblies which were all designed using helical gears, tapered roller bearings, and radial ball bearings. Validation of the gears, bearings, and shafts were done using RomaxDesigner software. Analysis of the duty cycle summary for the final design shows design failure shortly after the required combined life of 6400 hours.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
NUMERICAL SIMULATIONS OF HEAT AND MASS TRANSFER IN CONDENSING HEAT EXCHANGERS...ssuser7dcef0
Power plants release a large amount of water vapor into the
atmosphere through the stack. The flue gas can be a potential
source for obtaining much needed cooling water for a power
plant. If a power plant could recover and reuse a portion of this
moisture, it could reduce its total cooling water intake
requirement. One of the most practical way to recover water
from flue gas is to use a condensing heat exchanger. The power
plant could also recover latent heat due to condensation as well
as sensible heat due to lowering the flue gas exit temperature.
Additionally, harmful acids released from the stack can be
reduced in a condensing heat exchanger by acid condensation. reduced in a condensing heat exchanger by acid condensation.
Condensation of vapors in flue gas is a complicated
phenomenon since heat and mass transfer of water vapor and
various acids simultaneously occur in the presence of noncondensable
gases such as nitrogen and oxygen. Design of a
condenser depends on the knowledge and understanding of the
heat and mass transfer processes. A computer program for
numerical simulations of water (H2O) and sulfuric acid (H2SO4)
condensation in a flue gas condensing heat exchanger was
developed using MATLAB. Governing equations based on
mass and energy balances for the system were derived to
predict variables such as flue gas exit temperature, cooling
water outlet temperature, mole fraction and condensation rates
of water and sulfuric acid vapors. The equations were solved
using an iterative solution technique with calculations of heat
and mass transfer coefficients and physical properties.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
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Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
2. What We Will Talk About
Discussion of gears especially for FLL
Will have parallel topic for FIRST
For LEGO® gears, will use LDraw names
Will have a demo area here on the gears
3. Main Lessons to Teach in Gears
Terminology in Gears
Identification of Gears (Types)
Basic Properties of Gears
Gear Geometry
Gear Analysis (Gear Ratios)
4. Basic Gear Types in LEGO® - 1
In the Robotic Invention System 2.0 (t=tooth)
– Spur gears (8t, 16t, 24t, 40t)
– Crown/hybrid gears (24t)
– Bevel gear (12t)
– White Clutch gear (24t)
– Differential gear (16t & 24t on casing/shell)
– Worm gear (1t)
– Rack gear
8. Essential Terminology
Driver – gear with applied force
Follower – gear doing useful work
Idler – gear turned by driver & turns follower
Gear Train – many gears in a row
Geared Up – large driver, small follower to speed
gear train up.
Geared Down – small driver, large follower to
increase torque (turning force)
Compound gears – combination of gears and axles
where one axle has 2 gears often of different sizes.
9. Basic Gear Properties
When 2 gears mesh, driver makes follower turn in
opposite direction
Need odd number of idler gears to make driver and
follower turn in same direction.
Need 0 or even number of idlers to make driver and
follower turn in opposite direction
When large driver turns small follower, its called
gearing up and speeds up gear train
When small driver turns large follower, its called
gearing down and increases torque (turning force).
10. Basic Brick Geometry
1.2 studs high
One plate is 1.2
/3 = 0.4 studs high
So each 5 plates will be 2 studs high (0.4 x 5)
12. Gears (Spur) Meshing Horizontally
1 2 3
4 5
Possible to mesh
at stud lengths of
1 through 5
13. Gears (Spur) Meshing Vertically
2
4
Using 24 tooth and 8 tooth
at distance of 2 stud lengths
Using 24 tooth and 40 tooth
at distance of 4 stud lengths
Mesh at even stud lengths for best results
14. What happens with improper mesh?
When 2 gears are meshed, there is a certain
amount of built in “play” between them called
backlash.
When 2 gears are not meshed properly i.e.
within specification you get too much
backlash called slop OR too little backlash
and they are jammed together and this
creates friction.
15. Gears (Spur) Meshing Diagonally
Slop or friction typically
occurs when you make
gears mesh diagonally
Some Schools of Thought
1. Don’t do it as it makes gears out of specification and
something may go wrong e.g. gear teeth skipping
2. Do it as it gives you more creativity in meshing gears
in different configurations.
3. Do it but within some tolerance e.g. under 1%
17. What is the best type of gear teeth?
Gears need to have teeth that mesh properly
otherwise they will not work.
Best is a curve on the teeth that provides for
constant velocity when gear turning
Involute curves modeled on the teeth
provides this advantage and is the basis for
most modern gears.
18. Gear Tooth Geometry -2
The involute curve can be generated by wrapping a
string around a circle.
Gear Tooth
Shape
19. Gear Ratio
In order to determine what a gear will do for
us, we must quantify it.
Best measure is the gear ratio.
Gear Ratio = number of teeth in follower
number of teeth in driver
G.R. = Ft / Dt e.g. ⅓ or 1:3 (read as 1 to 3)
Interpret above as one turn of driver will turn
the follower 3 times.
20. Gear Analysis
To analyze any gear train you need to:
1. Locate the driver gear (see force applied)
2. Locate the follower gear (see where useful
work done)
3. Figure out if it is geared up or geared down
(big circle turning small circle – geared up)
4. Calculate the Gear Ratio using Ft/Dt. Use
the following 3 rules for gear ratio
calculation.
21. Rule 1 – Pair up gears
In the case of 2 gears, it is easy. The driver
is the one driven by the motor or applied
force. The follower is the one doing work.
Gear Ratio = 8
/24
= 1
/3
One turn of the
24 tooth will
turn the 8 tooth
3 times.
Driver
Follower
22. Rule 2 - Long Gear Trains
For many gears on different axles, driver is
one connected to applied force, follower is the
last one in the gear train. All others idlers.
Driver
Idlers
Follower Gear Ratio = 24
/40
= 3
/5
3 turns of the 40
tooth will turn
the 24 tooth 5
times.
23. Rule 3 – Compound Gears
Pair up as many drivers and followers and label them D1, F1,
D2, F2, etc. as needed. Note every time you follow an axle and
it has a second gear attached, start a new driver. Multiply the
gear ratios of all pairs of driver-follower.
D1
F1
D2 F2
Gear Ratio
= 24
/40 X 24
/40
= 3
/5 X 3
/5
= 9
/25
24. Possible Gear Configuration Pairs
other than 1:1 gear ratios
24t & 40t spur (or 12t & 20t dbl bevel) gives
3:5 or 5:3
24t & 8t spur gives 1:3 or 3:1
Worm & 8t spur gives 9:1
Worm & 24t spur gives 24:1
Worm & 40t spur gives 40:1
20t & 36t dbl bevel at 90° gives 5:9 or 9:5
25. Anecdotes to Spice Up Lessons
South Pointing Chariot – differential gear
Antikythera Mechanism – 32 gears in box
that can predict movement of planetary
objects like sun, moon, earth, zodiac, etc.