Basic Hydraulic

A link showing the preview of a book on Hydraulics!

http://books.google.com.ph/books?id=VCNmKQI6GiEC&printsec=frontcover&hl=en&source=gbs_summary_r&cad=0

Just read and learn:

Hydrodynamics versus Hydrostatics

Two ways of trasmitting fluid energy
1. Hydrodynamic: the kinetic or the impact of the moving fluid is converted to
mechanical energy.
2. Hydrostatic: energy is transferred through a confined fluid by the pressure that is
created by the application of a force to that confined fluid.

Pascal’s Law

Pressure exerted on a confined liquid at rest is transmitted equally in all directions, is the
same at any point in the liquid, and acts at right angles to the surfaces of the container
1. Pascal’s law is valid irrespective of the shape of the vessel
2. Any change in the exerted pressure is seen almost instantly throughout the liquid.
3. Fluid in a system can be as rigid as steel for the transmission of power.

Advantages of Hydraulic Power Systems

1. Provide high levels of readily regulated torque and force
2. Offer infinitely variable linear or rotary speed over a wide range
3. Instantly reversible
4. Can be stalled without damage
5. High power output is possible
6. High accuracy and extreme stiffness
7. Possible to be automated without electronics
8. Fully adaptable to electrical or electronic controls
9. Provide cushioning to reduce the effects of impact or shoch loads
10. The fluid itself provides lubrication

Disadvantages of Hydraulic Power Systems

1. Hazards exist due to high-pressure
2. Fluids are flammable
3. Leakage is possible
4. Adequate filtration is necessary
Hydraulics are ideal for applications requiring high forces for heavy loads, long stroke
linear motion, rigidity and accuracy with heavy loads, high-stall torque, etc.

Press–Force–Area Relationship

Pressure is defined as
Pressure = Force/Area
or
p = F/A
Several conversion factors for pressure
• 1 psi = 6895 Pa = 6.895 kPa
• 1 bar = 14.5 psi = 100 kPa

More:

http://www.cnu.ac.kr/~mnoh/pdf/fp/concepts.pdf
http://www.baumhydraulics.com/files/infobuild/basic_hydraulic.pdf

OJT's Narrative Report

OJT's Narrative Report

It was on April 16,2008 when Phillip Caingles and I started our On-The-Job training at PhilCom. On that day, we were assigned in Network Management Center (NMC) Department. The supervisor and engineers welcomed us nicely. They oriented and taught us about the job that we were about to do on that day. After the orientation, Engr. Earl Clemen brought us to the Main Distribution Frame (MDF) where we met our co-ojt’s in NMC, Mark Gregor Buot and Beverlyn Ranis, doing Pot Splitter Jumpering. They taught us on how to do it and so we tried to do the jumpering. It’s not that hard as long as you know about the horizontal and vertical connections in the MDF. Pot Splitter Jumpering is done whenever there is a new PhilCom subscriber. We do also Pot Splitter Removal to minimize the unnecessary connections that are not anymore active. We also do call thru for telephone line activation.
On the following days, we used to go outside whenever there are subscriber’s line problem or trouble tickets that will be sent to our department. We did the troubleshooting together with the engineer usually at the Remote Line Units (RLU) or at Extended Line Units (ELU) depending on the location of the line problem. We did our troubleshooting in different approach. We will ask first for the subscriber’s telephone number, if it is the correct number that we will troubleshoot then that’s the time we will do the proper troubleshooting of the line. Usually, we received complains about lost of the dial tone at subscriber’s end.
On our last day, we did the troubleshooting by our own. Fortunately, we were able to fix the problem. We were so satisfied in our task done.
We were so happy, grateful and fortunate that we were able to experience and learn a lot of things that are related in the field of communications. It’s the best On-The-Job training here at PhilCom especially in NMC with the guidance of our supervisor Engr. Antonio Bontilao and supportive engineers- Engr.Earl, Engr.Jorge, Engr.Oliver, Engr. Abe, Engr. Theresa and Engr. Judith.

Acknowledgement

Praises and adoration be to our heavenly Father, who, above all deserves our honor. To Him be all the glory for my accomplishment in my training.
We would like to extend our utmost gratitude to the people who played important role in the completion of our training For the warm welcome, with due respect, I am appreciative to Engr. Jodem Gatus. Thank you for your accommodation.
For the patience in guiding and teaching trainees like me, I am very much gratified to Engr. Antonio Bontilao, Engr. Abemael Dupa, Engr. Earl Anthony Clemen, Engr. Oliver Corsanes, Engr. Jorge Balaba, Engr. Maria Theresa Galeon and Engr. Judith Estillore. These learning I gained from you would be of great relevance to my studies. Thank you for all your efforts.
For the accompaniment and services, many credit to all of PhilCom employees.
For the fun and laughter, many thanks to my fellow trainees in PhilCom, you made my on-the-job training worthwhile. Our friendship means a lot. You will forever be cherished and treasured.
For all the add on knowledge beyond my learning in PhilCom, in sharing their learning and experiences in their trainings in other respective companies, thanks to my classmates. You are one of the many reasons why I reached this year level. May our last year in college nourish our knowledge and friendship more.
For all these memorable experiences, thank you to PhilCom- NMC family and to all the people who made my training possible in all aspects. May God bless us all.