1828 University of Central Lancashire UCLan Academic Year: 2023-24 Assessment Introduction: Courses: BEng/Meng Energy Engineering BEng/MEng Manufacturing Engineering BEng/MEng Mechanical Engineering DA Manufacturing Engineering DA Mechanical Engineering Title of the Brief: Engine Dynamic Balancing by Design Module Code: MP2784 Module Title: Mechanics, Kinematics and Materials Type of assessment: Report & Practical Work This Assessment Pack consists of a detailed assignment brief, guidance on what you need to prepare, and information on how class sessions support your ability to complete successfully. You'll also find information on this page to guide you on how, where, and when to submit. If you need additional support, please make a note of the services detailed in this document. Disclaimer: The information provided in this assessment brief is correct at time of publication. In the unlikely event that any changes are deemed necessary, they will be communicated clearly via e-mail and a new version of this assessment brief will be circulated. 1828 University of Central Lancashire UCLan Preparing for your assignment: To prepare for this assessment, please follow the lectures, attempt the questions of homework, and attend tutorials of Semester 1 within the module. Assessment Pack Contents: 1. Introduction The assignment is set to achieve the following two learning outcomes in MP2784 through practice, understand mechanics fundamentals, and investigate dynamic balancing in design of internal combustion engines. Analyse the relationships between material, shape and internal/external loads in one dimension and two dimensions. 1828 University of Central Lancashire UCLan Show the relationships between material, shape and internal and external loads for one-dimensional and two-dimensional applications. 3. Detailed assignment brief An internal combustion engine combusts fuel and generates power and rotational motion to drive a mechanical system. Due to accelerations of machine members – reciprocating or rotating parts, the inertia forces and moments are inevitably produced. Because the severity of the inertia loading increases as a square of the rotational velocity, for high- speed machinery the effects can be very objectionable, often resulting in vibrations, noise emission and premature failure of a fatigue nature. The majority of a reciprocating engine consist of multiple cylinders with pistons linked to the same crankshaft and lines of stroke that are parallel. These are called in-line engines. If the strokes are not all in the same direction, the configuration will result in either a V- engine or radial engine. In the market, the 5-cylinder in-line engine has been adopted into many car makes, for example, Ford Focus RS, Volvo 850R, Audi TT RS and RS3, Alfa Romeo 159 and Acura Vigor with around 2.5 litre turbocharged. Figure 1 illustrates one of commercial products with a 5-cylinder in-line engine. Fig 1. A 5-cylinder in-line engine from Audi In this assignment, you are supposed to investigate the effect of different firing orders and strokes, and achieve the best performance of dynamic balancing for a 2.5 litre 5- cylinder in-line petrol engine. Design parameters of the engine are provided for you to consider in your analysis. Five in-line cylinders are spaced 128 mm apart. The stroke is to be 68 mm and each connecting rod 150 mm. The reciprocating parts for each cylinder are 3.0 kg The crankshaft runs up to 3000 rev/min. 1828 University of Central Lancashire UCLan Task 1: Since you need to analyse many cases, in each of which firing order and stroke are different from the others, a generic calculator shall be made as a tool to avoid repeats in calculation and improve efficiency/accuracy for quantitative analysis. Using MS Excel is instructed for such a calculator. Or if you have had skills of coding in C, C++, Python, Matlab, or any other, you may programme into a calculator. In this calculator, just enter a firing order and the number of strokes, then 4 resultants can be produced automatically. Task 2: Explain your approach in investigating possible combinations of firing order and strokes. 5 different firing orders and 2 different strokes are recommended. Task 3: Use your calculator to calculate and present the resultants of primary forces, secondary forces, primary moments and secondary moments in each case. Compare them and present the case with the best performance in dynamic balancing. 4. Teaching into assessment Lectures in Semester 1 include examples related to assignment. 5. Sample of successful assignment Available in lectures, homework questions and tutorials in the teaching weeks 8 to 11. 1828 University of Central Lancashire UCLan 6. Assessment and marking criteria This assignment forms the basis of the assessment using the learning outcomes. It contributes 50% to the overall grade in this module. Anonymous marking applies. The criteria are shown as follows. ASSESSED ELEMENTS MARK ALLOCATION ENGINE DYNAMIC BALANCE BY OPTIMISED DESIGN Complete a written report providing all logic findings from your investigation. As a guidance, it should be written in approximately 2,000 words and be processed in Arial font at size 12 on the A4 sized paper. 1. Cover page and report structure Populate the provided coversheet as the cover page of your report. 100 marks (In total) 5 A table of contents is needed with page numbers. 2. Investigating procedure 10 Employ an analytical approach to study dynamic balancing and show a clear procedure with steps. 3. Functioned calculator 50 Insert your calculator in the report. If necessary, provide a user manual in the calculator. If you calculator is in Excel, use the sheet and present the calculation and results for each case. If your calculation is coded in certain language, make sure it can be run. 4. Analysis of dynamic balancing for all the design cases you identify 20 For your first case, present the calculate manually if forces and moments are in equilibrium, and find any unbalanced force or moment correctly. For the rest cases, present the inputs and results from your calculator. Include drawings, calculation and clearly textual explanations if necessary. 5. Design evaluation Based on your analysis, compare all the cases and provide an argument or judgement on the case with the best performance in terms of dynamic balancing. 15