Self Propelling Boat
Abstract and creative thinking are preferred in working out the best solution. There are about 5 stages to solve a problem: evaluating the problem, managing the problem, decision-making, resolving the problem, examining the results. Requirements, and the detailed information related was provided in the problem definition part. For this group work, with the aid of the professional problem solving steps, heuristic will be presented as follows: 1) Problem definition First of all, the definition of the problem will be explored and discussed in the beginning of this project.
For this part, rephrasing and reversing the problem as well as exposing and challenging assumptions are required. 2) Mind map and Process map It will then come to the part of generating the mind map through the brainstorming with software called Mindset. Members of group would chunk up and down to find multiple perspectives. 3) Descriptions of 4 designed ideas Four ideas about the self-propelling vessel would be generated out after the abundant collection of the relative scientific information. In this case, scientific background, structure, working principle as well as evaluation would be included.
Figures obtained from the Silkworms would be added to support the explanations. 4) Selection for accessing the best solution In this part, the quick elimination and deeper comparison would be included tot verify whether ideas meet all the requirements. As for quick elimination, two out of four ideas would be excluded Judging from the theoretical overview of advantage as well as disadvantages. And the deeper comparison would be 3 based on relative calculations and the extent of requirements fit to determine the best design. ) Implementation of the best design After determining the best design, such design will be reinforced by drawing detailed mechanical graphs, and its main components will be introduced. Then, calculation of the total force experienced by the boat will also be analyzed, and graphs like electric circuit, Silkworms figures would be included as well for a full description and implementation of the best solution. 6) Result testing and Cost Confirmation In this part, experiment would be carried out to test the traveling of the designed vessel.
What worth mention here is that the specific Simulations modeling would be executed in Mutual as well as Silkworms modeling to verify the motion of the vessel. II. Problem Definition In this coursework, students are required to carry out a project in a group of 3 or 4 members, with at least one MESS and one ICE student in each group. What is more, the subject of this coursework is to design a self-propelling vessel which would move on the water with a goal of traveling a distance of 10 meters in order to reach the end of the lane.
The lane is restricted to be 50 CM in width, 50 CM in depth, and 10 meters including any other taxes. In addition, there are some extra requirements including the dimension and the traveling quality. For traveling quality, it is expected to avoid touching or crashing the lane barriers during the whole motion. And as for the dimensions requirements, it is supposed to use a piece of polystyrene to construct a limited base within CACM * CACM * CM, and it should be self-contained and fit within a cube of 0. Mm in all dimensions.
Also, once the vessel starts on more interference or outside control was permitted to be applied on. 4 Students are required to accomplish the task with a displaying of a clear problem loving heuristic and adequate underlying engineering science, also, reasonable assumptions. Totally, 4 ideas should be generated and developed through the group discussion. Certainly, brainstorming skills and the process map to obtain a better supervise of problem solving progress would be applied. Then the best solution should be selected out by specific comparison with calculation, research and experiment.
And further work should be applied on the testing and presenting the best solution with a professional version. Assumptions: 1) There is no wind or strong air flow over the surface of water. It provides a relative peaceful environment which would not physically had strong effects over the motion of vessel. 2) There is no water turbulence. In this case, the water turbulence was assumed to be eliminated, which helped to guarantee the smooth Journey when the vessel starts the traveling. 3) Infinite water depth.
Although the water has certain depth, it is assumed to be infinite because it will simplify the calculation of water resistance subsequently. 4) Smooth & Reflective Lane Surface In the subsequent section, a smooth and reflective lane divider surface will facilitate he working of infrared sensors. 5 Ill. Mind Map 0 Description The mind map has been produced with the help of a software: “Mindset”, which is shown to the left. It has a deep insight into the self-propelling vessel, and divided it into 9 main parts, which are propulsion, how to keep straight, the software used, etc. Each main part categories. Onto various The mind map is capable of generating huge number of ideas and cultivating creativity of group members, which facilitates the generation of problem solutions. Figure 1: Mind Map 6 IV. Process Map The process map has been made with the aid of a software: Diagramming”, which is shown in Figure 2. It represents the steps required to solve the problem in details. It starts from the problem definition until the end of the solution. This process involves several steps and check procedures, which are used to facilitate the generation of reliable and diversified solutions.
Figure 2: Process Map 7 V. Four Designs 0 Rubber Band Driven Boat Front hook bend Figure 3: Rubber band driven Boat (Abernathy, n. D) Rubber Band Propeller 0 Elastic Potential Energy Elastic potential energy is the potential energy stored as a result of deformation of an lactic object such as stretched springs and twisted rubber band. In this case, the elastic potential energy stored in the rubber band is , where is the torsion coefficient and is the angle of twisted from its equilibrium position in radians (Hypersonic, n. D). Internal Structure As is shown in Figure 3, the internal structure of the boat is very simple. It is composed of a hull made by polystyrene with a two-blade propeller. A rubber band is stretched between two ends of the boat. One is connected to a hook in the front, while the other is connected to the propeller. 0 Working Principle Before it is put into the water, the propeller must be wound up by many rounds, until the rubber band is bent into small knots, in which huge elastic potential energy is stored inside the rubber band. Then, it is put into the water, and the propeller will be released.
The rubber band will convert the elastic potential energy into the kinetic energy of the rotating propeller, which is able to push the boat forward. 0 Evaluation pros Cons Simple Equipments Required Limited Elastic Potential Energy Stored 8 Cheaper (Low Material Cost) Hard to Control, Easy to Divert Low Energy Efficiency Clean, No Waste Residue Rubber Band Easy to Break Light No Feedback Control 0 Air Injection Boat Gas Chamber Outlet Port Figure 4: Air Injection Boat 0 Recoil Movement The recoil movement can be explained by the conservation of momentums and Newton’s Second Law.
When the air is injected from the chamber, the force injecting the air is equal and opposite to the force acted upon the boat, which makes the boat moving forward. The conservation of momentums can be expressed mathematically: , where m and v stand for mass and velocity of the air and the boat (Physiological, n. D). 0 Internal Structure As is shown in Figure 4, the boat is made of a polystyrene base with an extra chamber. Such chambers are properly sealed in case of any air leakage, except for a small outlet port, which allows the highly pressurized air to escape from the chamber.
The pressurized air can be generated by chemical reaction. 0 Working Principle The boat’s chamber contains Hydrogen Peroxide ( ) only. Then, some catalysts like Manganese Dioxide can be put into Hydrogen Peroxide to let it decompose to generate a huge amount of Oxygen and heat: 9 approximately 3. ALL of oxygen, and 70. 5] of heat under room temperature (20 co). Thus, the chemical reaction is able to generate high pressure, which pushes the boat forward.
Enough Propulsion Safety Hazard (High Pressure, Explosion) Cheap Uncontrollable (Impossible to Stop the Chemical Reaction) Low Efficiency Extra Chamber Cost Deposit Problems (Chemical Residue) 0 Stream Driven Boat Diaphragm Candle Steam Water Pipe Figure 5: Stream boat (Abernathy, n. D) Water Outlet Figure 6: Diaphragm (Nikolas, 2002) 0 Steam Expansion When liquid water is heated up to 100 co, it will boil first and turn into water vapor lately. According to scientific research, when turned into steam, its volume will increase by over 1,600 times larger than in standard temperature and pressure (Thermometer, 2003).
Its huge expansion contains huge energy, which can push turbines or drive wheels. 10 0 Internal Structure body. The diaphragm is fixed above the candle so as to be heated by the flame, in which is full of water. One end of the water pipe is connected to the diaphragm, and the other is put inside the water. Before it is put into water, the whole diaphragm and pipe are full of water. Then, the candle is lit so as to heat the water, which turns into steam subsequently after absorbing enough thermal energy.