SMGT 506 Written Assignment 4 Grading Rubric 50 Points Crite

Smgt 506 Written Assignment 4 Grading Rubric50 Pointscriterialevels Of

Supporting Resources 15 points 14 to 15 points At least 3 relevant, high quality supporting references are accurately cited and listed. 13 points At least 3 references are cited, but 1 or more are not in the desired format and/or not sufficiently relevant. 1 to 12 points Fewer than 3 references are included. 0 points Missing Quality of Information 10 points 10 points Information is accurate and clearly relates to the main topic and subject discipline. It includes relevant supporting details and/or examples. 8 to 9 points Information clearly relates to the main topic. Few or no supporting details and/or examples are given. Some information is inaccurate. 1 to 7 points Information has little or no relation to the main topic or is inaccurate. 0 points Missing Content 10 points 10 points All topics are thoroughly addressed and/or all questions are answered. 8 to 9 points All or most topics are generally, but not comprehensively addressed and all or most questions were answered. 1 to 7 points Topics and/or questions are not addressed satisfactorily. 0 points Missing Structure Advanced Proficient Developing Not present Organization 5 points 5 points Ideas flow well and paragraphs build on each other. 4 points Some paragraphs too long and/or contain more than one, main idea. Flow and transitions between paragraphs can be improved. 1 to 3 points Writing lacks flow and paragraphs are too long and/or don’t build on each other. 0 points Missing Formatting 5 points 5 points Paper is APA formatted. 4 points Paper is generally formatted well with few minor errors. 1 to 3 points More than a few elements of APA formatting are missing. 0 points Missing Grammar & Spelling 5 points 5 points Spelling, grammar, and sentence structure are correct. 4 points There are minor, noticeable, spelling, grammar, or sentence structure errors. 1 to 3 points There are more than a few noticeable spelling, grammar, and/or sentence structure errors. 0 points Missing Proposed Project: MANUAL TRANSMISSION DESIGN BACKGROUND: The basic transmission is connected to an engine shaft. Inside the transmission, this shaft is in turn connected to another shaft (layshaft) via two gears. The layshaft is in turn connected to a differential drive shaft (which is the main shaft that eventually runs the wheels of the car) through a series of another set of gears. The engine power causes the engine shaft to turn at a specified velocity (rpm = revolutions per minute) which in turn causes the other shafts to turn and eventually cause the vehicle to move. Thus, a set of four gears is needed to cause the car to run at a specified velocity and there are five sets of these gears inside the transmission, each one designed to cause the vehicle to move at specified speeds. When a person switches the lever (commonly known as “switching gears”), he/she is actually switching a set of four gears and thus he/she changes the velocity of the vehicle. A full five-speed transmission requires five sets of four gears in addition to an extra set of gears to account for the reverse speed of the vehicle. The design of this basic transmission is time-consuming. There are some issues that an engineer has to resolve: a) The required velocity (rpm) for the differential drive shaft has to be met, b) the engine shaft has to align properly with the differential drive shaft (otherwise the transmission will jam and collapse during high velocities), c) the gears have to be reliable and not interfere with each other, d) the shafts have to be able to withstand the loads imposed upon them and not bend, etc. This basic transmission is designed in four stages. The first stage deals with determining the dimensions of the appropriate set of gears that will meet the needed requirements: a) correct power output (rpm is related to power) at each gear shift, b) maintaining the alignment of the transmission shafts. The second stage deals with determining the material that will be used to make these gears. This includes analyzing the points of possible gear failure and analyzing the gears for possible interference. (Basically, we want to ensure smooth operation, reduce wear and tear, and design a reliable system.) The third stage consists of analyzing only the reverse gear set. This set is different from the other sets and requires its own set of calculations to determine whether the vehicle will operate well while in reverse. (If not properly designed, the vehicle can speed up so fast in reverse that it can crash into something.) The fourth stage consists of analyzing the loads imposed on the shafts. (The shafts should not bend or break during the operation of the transmission.) Part I-GEAR SELECTION FOR DIFFERENT GEAR MODES For this particular transmission, the engine is a 3.50 Hp engine that provides 4000 rpm. Transmission shaft length = 4 feet, differential drive length is 6 feet. Bending Strength =1.2) and check for gear interference. Part II-STRESS ANALYSIS ON GEARS For each gear selected, compute: b) Tangential Force, Radial Force, Normal Force, Torque. c) Check that Face width of gear tooth falls in the 8/Pd