tij1o-hydraulicBridge

include component="page" wikiName="jmcintyre" page="course_tabs_header" =Hydraulic/Pneumatic Bridge Competition=

Overview
Hydraulics and pneumatics form the foundation for many mechanical systems we use today. Drawbridges have been using hydraulics and pneumatics to open/close for generations. For the student just starting to understand design principles and how technology plays in our lives there is no better place to start than by studying hydraulics and pneumatics along with basic structural design.

The Challenge
You will design and build a bridge able to span a distance of 20cm and support a dead load, at its end, of 20 grams. The bridge must be able to open/close and carry the 20g weight with it. The bridge movement must be controlled by hydraulics/pneumatics and the equipment provided.

Specification
1. You will be given 6 m of “scaled 2x6’s” (scaled: 6 mm, 12 mm) soft wood. 2. Only wood glue may be used. 3. If a wood joint fails, the competition is over for you. 4. You will be evaluated in both your construction as well as how the bridge performs. 5. You will also be evaluated in how many full open and close events can occur in 60s. 6. An open/close even is said to occur if the bridge has sufficient movement to reach an open/close start and final position (it depends on the design of the individual bridges)

Note: Construction can only take place in the classroom.

Materials
- 6m of scaled “structural 2x6” (6mm x 12mm) - PVA glue - 2 syringes and connective tubing

New Terminology
1) Research the following words and give definitions for each in the research component of your plan
 * Actuator
 * Amplification power
 * Bernoulli's principle
 * Boyle's Law
 * Cavitation
 * Charles' Law
 * Compressibility
 * Fluid Controller
 * Cylinder (for hydraulics/pneumatics)
 * Efficiency
 * Flow
 * Fluid
 * Hydraulic motor
 * Manifold
 * O-ring
 * Pascal's Law
 * Piston & Piston-rod
 * Servovalve
 * Solenoid
 * Vacuum


 * Things to turn in and/or have evaluated:**
 * **Component** || **Value** ||
 * 1 - Sketches || 4 ||
 * 2- CAD drawing || 10 ||
 * 3 - Truss construction || 10 ||
 * 4 - Practicality of design || 10 ||
 * 5 - Testing || 10 ||
 * 6 - Peer review || 4 ||
 * 7 -Technical Report || 10 ||


 * **CATEGORY ** || **4 ** || **3 ** || **2 ** || **1 ** ||
 * **Sketches ** || Drawings are flawless - pullouts (notes) include relevant design details || Drawings are good, pullouts are included. Mostly all details are addressed. || Generally the drawing conveys design plans. There are several design elements missing. || Many design elements are missing from the drawing, but overall the design can be understood. ||
 * **Truss construction ** || Construction of the product is superior. All joints and cuts are careful and deliberate. Product is stylistically superior. || Construction is sound. Cuts and joints may not all be perfect. Product is generally pleasant to look at. || Generally the construction is solid. Cuts and joints as well as style all leave something to be desired. || The construction is weak. Joints and or cuts are mismatched which results in a stylistically inferior product. ||
 * **Truss**
 * practical design** || Construction is elegant, yet simple and uncomplicated. Labour costs would be low as a result which increases profit. || Design is well planned, but perhaps more complicated than it should be. || Because the design is more complicated than it should be, labour costs are likely higher than they should be. Design could, and should, be easier || Design is not well thought through, no matter how sturdy. ||
 * Competition results || Bridge moved the most number of times in 60s of time || --> || --> || Bridge moved the least number of times in 60s ||
 * Technical Report || All aspects of the report are present and exemplary || <span style="font-family: Arial,sans-serif; font-size: 12px;">All aspects of the report are present, though may require some work || <span style="font-family: Arial,sans-serif; font-size: 12px;">There are aspects missing and work is required || <span style="font-family: Arial,sans-serif; font-size: 12px;">There are many flaws in the report ||
 * **<span style="font-family: Arial,sans-serif; font-size: 12px;">Use of Time ** || <span style="font-family: Arial,sans-serif; font-size: 12px;">Used time well during each class period (as shown by observation by teacher, and documentation of progress in journal) with no reminders. || <span style="font-family: Arial,sans-serif; font-size: 12px;">Used time well during most class periods (as shown by observation by teacher, and documentation of progress in journal) with no reminders. || <span style="font-family: Arial,sans-serif; font-size: 12px;">Used time well (as shown by observation by teacher and documentation of progress in journal), but required reminders on one or more occasions to do so. || <span style="font-family: Arial,sans-serif; font-size: 12px;">Used time poorly (as shown by observation by teacher and/or documentation of progress in journal) in spite of several reminders to do so. ||