PT1.1 - Engineering Goals

1.1 Engineering Goals, Identification of Problem and Specific Requirements

Engineering Goals : To design and make a model motor bridge which displays high structural efficiency i.e. high strength-to-weight ratio.

Problem Statements (10) :

Statement form: 
Stability of the bridge is important as it will allow the tension to be held at a larger area of the bridge. In order to maximise the chances of the bridge holding more weight will allow the efficiency of the bridge to be higher.By using lesser sticks will allow the bridge to weigh lesser, hence increasing the efficiency.Arrangements of the sticks is also important as it may allows more friction to be acting between the sticks, preventing it to break apart easily.The more stick used, the more tension is spread across, but at the same time cause the weight of the bridge to be more.The most important thing to note is to be able to spread the tension across as many area of the bridge as possible, as this will make the strength of the bridge to be highest as each sticks contributes to the strength of the bridge and not just one stick.

Question form:
1. How do we ensure that the bridge is stable?
2. How do we maximise the chances of the bridge holding more weight?
3. How do we ensure that we use the least number of ice-cream sticks but are able to make a strong and stable bridge?
4. How do the different arrangement of ice-cream sticks affect the bridge's stability?
5. How do the number of ice-cream sticks used affect the bridge's stability?
6. How do we structure the bridge such that the sides are strong enough to hold the weight?
7. How does the shape of the bridge affect its strength?
8. How do we evenly distribute the weight of the bridge so that the tension applied is equal everywhere?
9. Do having side supports affect the bridge and how much weight it can hold? 

Specific Requirements :

1. The model bridge may be constructed from standard sized ice-cream sticks only. No other material is allowed. The dimensions of the standard sized ice-cream sticks are estimated as follow: Length : 113 mm Width : 10 mm Thickness : 2 mm

2. The ice-cream sticks may be cut or joined in any fashion. Joining may be done with any commonly available adhesive / glue only. No other material, i.e. string, tape, wire, nails etc, is allowed.

3. The bridge may be stained, painted or coated in any fashion.

4. The bridge must have a length between 550 mm and 650 mm, a maximum width of 120mm, a maximum height of 200 mm and a maximum weight of 500g. There will be penalty for non-compliance.

5. The load will be applied downward using a loading bar placed across the centre of the deck and masses will be supported on a suspended vertical loading rod. 

6. To simulate a real-life bridge, the model bridge must have a deck for motor vehicles to travel on.

7. The bridge must be constructed to allow for the loading bar to be placed across the centre of the deck.

8. Loading will stop once bridge failure occurs. Bridge failure is defined as the inability of the bridge to carry additional load with any member of the bridge breaking, or total collapse whichever occurs first.

9. The structural efficiency, E, of the bridge will then be calculated.

E = Load supported in grams / Mass of bridge in grams

10. All construction and material requirements will be checked prior to testing by the judges. Bridges that fail to meet these specifications will be disqualified.

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