Date post: | 18-Dec-2015 |
Category: |
Documents |
Upload: | gwendolyn-hart |
View: | 216 times |
Download: | 0 times |
General Information
(14.4 MB) – Matthew Bono
CLF 2900. Work and Power CLF 2912- Uses for Work and Power
California Agriculture Mechanics Pathway Standards
B11.0: Students understand the principles and applications of various engines and machinery used in agriculture B11.4- Know the theory and operation of
mobile hydraulic systems and power take-off systems
Work and Power
What are Work and Power Work
Using force to act on an object over a distance. Pushing a car up a hill
Power The rate at which work is performed
Pushing a car up a hill faster than someone else
Work and Power
In Hydraulics Hydraulic systems are a way to do work
and use power to move or stop objects. The systems can increase, speed, power,
and are maneuverable
Common Examples
Automobile Brakes
Hydraulic FluidPressurized by foot pedal and booster closes piston, slows rotor and wheel
Common Examples Airplanes
Planes use hydraulics to fly, land and steer
Red Lines and Blue Lines control different surfaces using different systems but same control lever
Principle of Transmission of Fluid-Pressure
“Where there is an increase in pressure at any point in a confined fluid, there is an increase at every other point in the container.“
Theory Demonstrated
KeyF1- Force 1 F2- Force 2A1- Area 1 A2- Area 2
Blue area is fluid acting on both pistons in the closed system
Theory ExplainedHydraulic System
typically fluid is pumped into a confined space in order to make something move.
This movement can be to turn a motor or extend or retract a ram or piston.
Moving either piston in the picture would move the other.
F1= Force 1 F2= Force 2A1= Area 1 A2= Area 2
Theory ExplainedIf F1=F2 the System has No Movement
In Real life these systems usually involves movement
The F1=F2 pistons are connected by the same fluid
If the fluid moves equally, piston 1 moves further but with less force due to less surface area
F1= Force 1 F2= Force 2A1= Area 1 A2= Area 2
How It Works
1. Motor Spins Pump2. Pump Moves fluid
a. Out of reservoirb. Through filterc. Through Pumpc. Into valve
3. Valve directs fluid to ram
4. Pressurized side of ram moves
5. Fluid on other side of ram returns to reservoir
How to Power the SystemElbow Grease- like a automotive jackElectric MotorFueled Motors
gasoline, diesel, aviation anything elseSystem Design
Flow RatesPressuresLocationPoint of Action
As motor power goes up the pump has more power to move fluid
This can increase flow rate or pressure
How it worksFlow Rate
Hydraulic systems rely on filling a given area with fluid
The more fluid you pump into the area the faster the implement moves
If your trying to float a rubber boat in a swimming pool what will do it faster a garden hose or a fire hose
How it worksPressure
Hydraulic systems like the jaws of life can create incredible amounts of force
What shoots further, water from a hose spraying a cone or spraying a jet
Advantages
Force Multiplier – Automobile Brakes
Controllable- variable speed and power
High power low weight- Especially air powered
Very Mobile- Harvesting Equipment
Possibilities- Diesel Hydraulic Hybrid Delivery Trucks Roller Coasters
Force Multiplier – Automobile Brakes The force of your foot can stop an
entire car, with help from hydraulics
Controllable-
Large harvesting equipment can do dozens of things at one time all with hydraulic power
Controllable- Cotton Picker Header
Each row of cotton goes through the picking zone
Each spindle moves independently of the others while machine moves through field, blows lint into hopper and discards waste
Very Mobile
The jaws of life in the last slide are used by hundreds of rescue outfits across the US and are readily carried everywhere they go
Possibilities- Diesel Hydraulic Hybrid Delivery Trucks
This truck showed a 60To 70% increase in fuel economy and reduced emmisions by more than 40% and could reduce costs to consumers and companies while reducing the pollution.
Hydraulic systems are in everything from aircraft to theater performances in Las Vegas. Someone had to design, build and maintain all
these systems, why couldn’t it be you?