Micro Sprinkler Groundnut performance. Micro sprinkler in onion.
Hydro Driven Sprinkler
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Transcript of Hydro Driven Sprinkler
Aaron Murenbeeld
Mohamad Ferdos Alam
Muhammad R. Arif
Hussain Alhelal
Kaveh Arfaei
Ahmad Al Adel
Mechanical Engineering 3E05
Group: MJ04
1
Agenda Introduction
Existing designs
Problems
Improvements
Final Design
Conclusion
Questions
2
Introduction Water flows through the hose
Flow causes the sprinkler arms to rotate
Resulting rotation drives a gearing system which in turn drives the sprinkler
The front wheel provides steering for the system
3
Competitor’s Designs Products by Nielson and John Deere
Cast iron body
Weight
Yellow ~ 9 kgs
Green ~ 7 kgs
Nylon gears
Wheel Designs
Wheelbase
Track length
Nielson (Yellow)
John Deere (Green)
4
Problems Low water pressure
i.e. Residential vs. Agricultural neighbourhood
Derailing Problem in sharp bends
A factor of wheelbase and track length
Angle of ascent
A factor of gear ratio and available system torque
Gear system
Weak nylon gears
5
Design Objectives Optimize the sprinkler system
Redesign of Sprinkler Arms
New Gear box for desired torque
Angle of ascent
Turning Radius: Length of the wheel base
6
Sprinkler Arm Redesign of Sprinkler Arms
Bend Angle (φ angle)
Optimum Bend Angle = 45 o
Water Projection Angle (α)
Optimum Angle = 10 to 16 o
Exit Nozzle Diameter
Optimum Diameter = 3 mm
Arm length
Optimum Length = 223 mm
7
Water Projection Radius, Torque and Flow Rate vs. Angle α
φ =40oφ =45o8
0
2
4
6
8
10
12
14
16
0 10 20 30 40
Ma
gn
itu
de
of
Ra
diu
s, T
orq
ue
, a
nd
Flo
w R
ate
Water Projection Angle, α (Degrees)
0
2
4
6
8
10
12
14
16
0 10 20 30 40
Ra
diu
s, T
orq
ue
, a
nd
Flo
w R
ate
Angle α (Degrees)Water Projection Radius (m)
Torque (Gain 10) (N·m)
Flow Rate (Gain 10) (L/s)
0
2
4
6
8
10
12
14
16
18
20
2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3 3.1 3.2
Ra
diu
s, T
orq
ue
, a
nd
Flo
w R
ate
Nozzel Diameter (mm)
Water Projection Radius, Torque and Flow Rate vs. Nozzel Diameter
Water Projection Radius (m)
Torque (Gain 10) (N·m)
Flow Rate (Gain 10) (L/s)
Nozzle Diameter
φ =45o
9
Arm Length
10
0
2
4
6
8
10
12
190 200 210 220 230 240 250 260
Ra
diu
s, T
orq
ue
, a
nd
Flo
w R
ate
Arm Length (mm)
Water Projection Radius, Torque and Flow Rate vs. Arm Length
Water Projection Radius (m)
Torque (Gain 10) (N·m)
Flow Rate (Gain 10) (L/s)
φ =45o
Design Options Redesign of the Sprinkler Arms
Alternate Designs
4 armed Sprinkler
3 armed Sprinkler
Curved armed Sprinkler
2 armed Sprinkler
11
Determine System Speed Water depth ~= 13 to 26mm Optimum Radius = 9m
12
Relate System Speed to Gear Ratio
0
0.2
0.4
0.6
0.8
1
1.2
400 600 800 1000 1200
Fo
rwa
rd V
elo
city
(m
/min
)
Gear Ratio (1:x)
Sprinkler speed vs gear ratio
Green System
New System
Gear ratio was chosen from desired system velocity
Two gear ratios were chosen that provide the following watering depths
26mm
13mm
13
Gearbox New gearbox for desired torque
Yellow System
Gear Ratio
High Gear 1:488
Low Gear 1:894
Nylon Gears
System failed as indicated
New and Improved
Gear Ratio
High Gear 1:783
Low Gear 1:1102
Nylon MDS14
Gear analysis New and Improved
Gear Ratio
High Gear 1:783
Low Gear 1:1102
Nylon MDS
System will fail at indicated gear
Gear efficiencies
One way gearing ratio
Gear shifting
15
Number of Teeth Width (mm)
Gears Old New Old New
Worm 1 1
A 43 53 6 16
B 16 16 8 14
C 24 22 4 13.5
D 36 43 4 13.5
E 44 44 4 14
F 16 16 8 15
G 44 44 8 15
H 16 16 18 25
I 44 44 15 25
Torque Analysis Torque in new system
is approximately 2 times higher than old system
16
Angle of Ascent Angle of Ascent
Yellow/Green comes to a stop at 22 degrees limited by torque
New Design comes to stop when it slips Limited by coefficient
of friction (ground and wheel)
Important that center of gravity does not sit past the rear axel, when on a slope. Not a problem for the new system, CG well ahead of rear axel.
μAngle of Slippage
1 45o
0.55 28.8o
0.3 16.7o
17
Wheel Design Wheel Design
Front Wheel
Rear Wheel
Spike Design
Parallel paths/Singular paths
Wheels are Nylon MDS
Spike Configuration
Yellow Green
18
Turning Radius Turning Radius: Length of the wheel base Wheel Base
Wheel Base , W = 230 mm (new)
Track length
Track length , L= 195.5 mm
Resultant Turning Radius = 1.17 m
Yellow System Wheel Base
Wheel Base , W = 350 mm
Track length
Track length , L= 205 mm
Resultant Turning Radius = 2.48 m
19
Body Design New Body Design
Lighter
Lower Center of gravity
Maintenance
Materials
Body : Nylon MDS
Block : Cast Iron
20
Body Design Three bodies tried
Yellow body (9kg)
Green body (7kg)
New Body (4.6kg)
Nielson (Yellow)
John Deere (Green)
Light Test Body21
Conclusion Low water pressure New sprinkler arms
Derailing Problem in sharp bends Smaller wheel base
Angle of ascent Torque increased
Gear system New gear ratio
Nylon MDS gears
22
Thank you, Questions?
23
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