UNIT 3 7 FLUID TECHNOLOGY Mr Brooks Foundations

UNIT 3 -7 FLUID TECHNOLOGY Mr. Brooks Foundations of Technology

Standard 5. 7 � Examine and analyze open and closed fluid systems in terms of common components and basic design.

Clear Target � You will be able to: � Differentiate between hydraulic and pneumatic systems and provide examples of each.

Technology System � A group of resources (subsystems) working together to solve problems or extend our human capabilities.

Two types of Fluid Systems � � Hydraulic system: a system that uses the properties of liquids (usually an oil-based product) to generate, transmit, and control power. Pneumatic system: a system that uses compressed gas to generate, transmit, and control power.

Hydraulic Systems � Examples include: � Vehicle lift � Construction equipment � Vehicle cooling system

Typical Hydraulic System Reservoir : Holds the hydraulic fluid � Valve : Controls the fluid flow � Pump: Supplies fluid under pressure to the system � Cylinder: Uses pressurized fluid to do work � Piston: The rod inside of a cylinder that moves back and forth �

Pneumatic Systems � Examples Include: � Bicycle pump � Medical and dental tools � Mechanic tools

Typical Pneumatic System Compressor: Supplies pressurized air to the system. � Reservoir tank: maintains a supply of air for the tools to use. � Regulator: Controls the amount of air pressure in the system. �

Open and Closed Systems Open system: a system that is not pressurized and relies on gravity as the force that moves the fluid. Example: aqueduct or a water wheel � Closed system: a system that is pressurized and does not rely on gravity. �

Pascal’s Law P= F / A Since the pressure in the system is the same throughout, the pressure in cylinder 1 = the pressure in cylinder 2. � Therefore: F 1/A 1 =F 2/A 2

Practice # 1 �

Example # 2 You are working a log splitter. The input cylinder has an area of 3. 14 inches squared and you exert 20 pounds of force into the machine. If the output cylinder has a radius of 2 inches, how much force is being exerted on the output cylinder? � �

Assignment � In your groups, you will go to www. grc. nasa. gov � Once there, search for Pascal’s Law in the search box. Open Pascal’s Principles and Hydraulics. Read and do problems 1 -4 � �