Assessment Brief 2 Student Name/ID Number Course BTEC HNC in Mechanical/General/Manufacturing and Electrical and Electronic Engineering Unit Number and Title 3: Engineering Science Academic Year...

how much and how quick could you do this?


Assessment Brief 2 Student Name/ID Number Course BTEC HNC in Mechanical/General/Manufacturing and Electrical and Electronic Engineering Unit Number and Title 3: Engineering Science Academic Year 2019/2020 Unit Tutor Dr Jay Swope Assignment Title Mechanical Engineering Systems Issue Date 26 February 2020 Submission Date 25 March 2020 IV Name & Date Allocation of time to complete assignment Assignment will be completed outside of class. Estimated time for completion of the assignment is 15 hours. Submission Format This is a problem and practical based assessment. To evidence that you have met the criteria: · Must show working out · Use the correct units of measurement · And use formulas right through. Remember, answers are only part of the solution. You must show how you got there and be able to document and communicate your problem solving technique. Each criteria has a subset of questions. The distinction criteria is meant to cement your knowledge. Some higher criteria questions will draw on you to interpret, compare and draw conclusions of worked solutions. Formats: Part 1: Calculations and descriptions to answer questions in written format. Calculations may be done by hand. Part 2: A formal laboratory report of around 500 words with appropriate use of structure and referencing. Part 3: A formal report of around 500 words with appropriate use of structure and referencing. Part 4: Calculations and descriptions to answer questions in written format. Calculations may be done by hand. Part 5: A formal report of around 500 words with appropriate use of structure and referencing. Where references are used, follow Harvard Referencing System including in-text citations. Unit Learning Outcomes LO2 Determine parameters within mechanical engineering systems Assignment Brief and Guidance Scenario You work as a mechanical engineer and you have been tasked to solve several problems that draw from your ability to make fundamental mechanical calculations. Your company has a diverse range of products and you are developing techniques and procedures to follow in several areas including loading and reactions in beams, principles of upthrust in fluid applications, thermal expansion, dynamic balance, and heat transfer. Your work will show your ability to tackle problems in each of these areas. Task Part 1: Determine the support reactions of a beam carrying a concentrated load and a uniformly distributed load. A. Supporting theory and practical applications 1. Describe the principles involved in determining the support reactions in beams. Include in your description the conditions for static equilibrium. 2. Make a sketch of one of the following practical applications. Show on your sketch the forces involved. Give a description of how reaction forces can be found in your chosen application. a. A pair of lifting jacks on either side of a load. b. Distributed loads on a machine mounted on a table. c. The load on the prongs of a forklift. d. Loading on the wheels of a trailer. B. Problems involving support reactions for beams. 1. Find the reactions at the supports of the beam below under the loading depicted. RA RB 8 kN 12 kN 5 kN 11.3 m 1.5 m 3.3 m 1.7 m 2. Find the reactions at the supports of the beam below under the loading depicted. 10.1 m 4.1 m 1.2 kN/m 18 kN 7 kN RA RB 22 m Part 2: Use Archimedes’ principle in contextual engineering applications. These tasks have a practical component as well as explanation and calculation components. A. In this application you will model the buoyancy forces acting on a ship/submarine design. 1. First, explore Archimedes’ principle using a capped plastic bottle and a range of filler material. Make observations of the depth that the bottle submerges with varying amounts and types of filler. 2. Back up the results that you obtain experimentally with calculations involving Archimedes’ principle. 3. Summarise your modelling results. B. In this application you will utilise Archimedes’ principle to verify a method for finding the relative density of fluids using a hydrometer. 1. Make a sketch of a hydrometer suitable for use in determining the relative density of a fluid. 2. Write an experimental method for collecting data using the hydrometer to find relative density of a fluid. 3. Using Archimedes’ principle and free body diagrams, show the calculation method to find relative density of a fluid based on data collected using the hydrometer. Part 3: Determine through practical examples the change within a solid material when exposed to temperature variations. A. Practical examples using a bimetallic strip made from brass and iron. 1. Explain how a bimetallic strip made from brass and iron will bend. Include in your explanation a diagram and reference to the relative thermal expansion properties of each metal. 2. Construct a diagram to show how a bimetallic strip will make or break a contact for one of the following applications. Give an explanation of how it works. a. Thermostat b. Electric iron B. Practical examples of thermal expansion that must be considered in industry. 1. Choose one of the industrial practical examples below a. Lags in telephone wires b. Loops in pipes carrying hot liquids c. Wedge joints between sections of rail in railroads. 2. Construct a diagram and explain how the industry approaches thermal expansion in your choice. 3. By way of calculation, show how much change in length must be accommodated in your choice. Part 4: Determine unknown forces by applying d'Alembert's principle to a free body diagram. A. The pulley system in the diagram below is being used to hoist a 200 kg load. The friction in the pulley system is 180 N. The tension in the cable is not to exceed 2500 N. Draw a free body diagram for the load. Apply d’Alembert’s principle to the free body diagram and then determine the maximum lifting acceleration. B. Considering the pulley system above, find the maximum allowable acceleration when lowering the load without losing tension in the cable. Construct a new free body diagram and apply d’Alembert’s principle. Compare the scenario with lowering the load with one of raising the load. Discuss why the two scenarios give different results and contrast the limiting conditions for each. C. A conveyor belt similar to one shown below is designed to move containers between stations in a start and stop operation. The containers travel 6 m between stations and accelerate over a distance of 0.5 m to a travel speed of 3 m·s-1 and deaccelerate over a distance of 0.4 m to a stop. Construct a free body diagram for an item on the belt and apply d’Alembert’s principle. Determine the minimum traction force required to keep the containers from sliding. Part 5: Critically compare how changes in the thermal efficiency of a heat transfer process can affect the behavioural characteristics of a mechanical systems. Investigate the operation of an automotive air conditioning system using internet and real examples. Use this knowledge as the basis for study of thermal efficiency of a heat transfer process in a mechanical system. Explore what components or subsystems contribute to changes in thermal efficiency. Write a technical report that critically compares how changes can affect the behavioural characteristics of the automotive air conditioning. Include in your technical report the following concepts: · Continuity of volume and mass flow for an incompressible fluid · Effects of sensible/latent heat of fluid · Heat transfer due to temperature change and the thermodynamic process equations Resources Textbooks BIRD, J. (2012) Science for Engineering. 4th Ed. London: Routledge. BOLTON, W. (2006) Engineering Science. 5th Ed. London: Routledge. TOOLEY, M. and DINGLE, L. (2012) Engineering Science: For Foundation Degree and Higher National. London: Routledge. Journals International Journal of Engineering Science. International Journal of Engineering Science and Innovative Technology. Websites https://www.khanacademy.org/ Khan Academy Physics (Tutorials) Learning Outcomes and Assessment Criteria Pass Merit Distinction LO2 Determine parameters within mechanical engineering systems. D2 Critically compare how changes in the thermal efficiency of a heat transfer process can affect the behavioural characteristics of a mechanical systems. P3 Determine the support reactions of a beam carrying a concentrated load and a uniformly distributed load. P4 Use Archimedes’ principle in contextual engineering applications. P5 Determine through practical examples the change within a solid material when exposed to temperature variations. M2 Determine unknown forces by applying d'Alembert's principle to a free body diagram. 9 HNC/HND Engineering/Nuclear Engineering/Aeronautical Engineering