Naval Architecture Midterm Exam - AOE 3204 - Prof. Leigh S. Mccue-Weil, Exams of Aerospace Engineering

Download Naval Architecture Midterm Exam - AOE 3204 - Prof. Leigh S. Mccue-Weil and more Exams Aerospace Engineering in PDF only on Docsity! AOE 3204 Naval Architecture Midterm March 4, 2009 Directions: You have 50 minutes to complete this exam. The test is closed book. You may use a calculator. Problem one consists of 3 short concept questions worth a total of 33 points. The remaining 66 points are divided between two longer detail problems. It is in your best interests (partial credit) to show all work. You may write on the exam paper or attach additional sheets as necessary. Budget your time wisely. Name: (1 point) 1 Problem (1): Concept questions (33 points total) (1a) In a few sentences, describe the topic and issues covered in the assigned supplemental reading for this course? (10 points) (1b) Discuss the pros and cons of locating an anti-roll tank above the center of rotation. Include a sketch to convey your point. (15 points) (1c) Given the following data, draw a sketch of GZ and WHA. Using your sketch, estimate the steady wind heel angle. Mark the steady wind heel angle on the sketch and provide a numerical answer. (8 points) φ (deg) GZ (ft) WHA (ft) 0 0 0.50 10 0.70 0.48 20 1.65 0.44 30 2.97 0.38 40 3.98 0.29 50 3.92 0.21 60 2.78 0.13 70 1.59 0.06 80 0.08 0.01 2 Problem (2): Extra workspace 5 Problem (3): Free surface effects (33 points total) (a) Calculate the free surface effect (virtual rise in the ship center of gravity) caused by a free surface in a partially filled rectangular ballast salt water tank 50 ft long and 25 ft wide on a ship that displaces 20,000 long tons of saltwater. (b) Calculate the free surface effect (virtual rise in the ship center of gravity) caused by a free surface in a partially filled rectangular ballast salt water tank 25 ft long and 50 ft wide on a ship that displaces 20,000 long tons of saltwater. (c) Based on the results of parts (a) and (b), comment on how you would design tank space. Consider the practical implications for real ships. Recall: GGv = wggv∆ where ggv = it v . 6 Problem (3) Extra workspace 7