Hydraulic Systems The Basics Basic Principles Liquids:
Have no Shape Are incompressible Transmit force in all Directions, Equally Multiply Force F P A
w o H s e do ? k
r o ti w System Parts Advantages & Disadvantages of Hydraulics Advantages: Flexibility
Multiplication of Force Simplicity Compact Economy Safety Disadvantages: Efficiency Cleanliness
Primary Hydraulic Systems Open-Center Systems: Oil is pumped constantly, excess oil is returned to the reservoir. Closed-Center Systems: Oil is pumped on demand, control valve stops oil flow.
Open-Center Systems Simplistic Inexpensive Ineffective with Multiple Applications Variations of Open-Center Systems:
Open-Center with a Series Connection Open-Center with a Series Parallel Connection Open-Center with a Flow Divider Closed-Center Systems No Relief Valves Needed Application can be tailored by restricting flow Specialized functions have more support
Multiple functions can be used at the same time Variations of Closed-Center Systems: Closed-Center with Fixed Displacement Pump and Accumulator Closed-Center with Variable Displacement Pump Hydraulic Facts Mechanical-Hydraulic-Mechanical Inputs and Outputs
Three types of Hydraulic Energy: Potential, Kinetic, & Heat None are created or destroyed, only converted All energy input is converted into an output, gain (work) or loss (heat) A restricted flowing liquid creates heat This also causes a pressure drop
Hydraulic systems must be sealed to work Hydraulic Facts Oil takes the path of least resistance Oil is pushed into a pump, not drawn A pump does not create pressure, it creates flow. Pressure is caused by resistance to flow. These can produce the same power: High pressure & low flow
Low pressure & high flow Two basic types of hydraulics: Hydrodynamics Hydrostatics
Online bullying affects nearly one in four children aged 8-17. Thirty-seven percent report being bullied online. Online bullying can take the form of children being mean or unfriendly, calling others mean names and making fun of or teasing others.
Kaspersky. Diğerleri. Kaspersky Anti-VirusPersonal, kullanıcı dostu arayüzü, güçlü tarama ve koruma özellikleri, e-posta kontrol özelliği ile bilgisayarınızı özellikle internetten gelen virüslere karşı koruma sağlıyor. Yaklaşık 2 milyondan fazla zararlı ve virüsü tanıma özelliği var. Anti-Vir (Avira) AVG. BitDefender
Integration of "Ole Miss" This event happened at the University of Mississippi. It happened in September of 1962. James Meredith was an air force veteran who wanted to attend the University of Mississippi
Back MD, et al.: Facebook profiles reflect actual personality, not self-idealization. Psychol. Sci ... From Michael Bernstein, professor of Comp. Sci. at Stanford U "Hammering ethical protocols designed for laboratory studies onto internet experimentation is fundamentally misguided" ...
Model bias and VarBC. Change of observing system can be a cause of a jump in a time series. Variational Bias Correction is a superior method to remove such "jumps" but the field converges asymptotically to the model climatologywithout anchoring...
Identify theme and strategies of finding theme within a story. Identify central idea and main idea . What are similarities and differences between the two? What strategy do I want to use to find central/main idea? How are theme, main...
Ready to download the document? Go ahead and hit continue!