Unit 5003 Assignment Brief
| Qualification | Pearson BTEC Higher Nationals in Engineering |
| Unit Number | 5003 |
| Unit Title | Advanced Mechanical Principles |
| Unit Code | K/651/0810 |
| Unit Level | 5 |
| Credits | 15 |
Introduction
A mechanical engineer is required to have an advanced knowledge of most of the machinery used within the engineering industry, and should understand the physical laws that influence their operation.
The aim of this unit is to continue covering the topics discussed in Unit 4008: Mechanical Principles and other higher-level topics such as:
Poisson’s Ratio and typical values of common materials; the relationship between the elastic constants such as Bulk Modulus, Modulus of Elasticity, Modulus of Rigidity; the relationship between bending moment, slope, and deflection in beams; calculating the slope and deflection for loaded beams using Macaulay’s method; analysing the stresses in thin-walled pressure vessels; and stresses in thick-walled cylinders, flat and v-section belt drive theory.
On successful completion of this unit students will be able to have more advanced knowledge of mechanical principles including behavioural characteristics of materials subjected to complex loading, the strength of loaded beams and pressurised vessels, specifications of power transmission system elements, and operational constraints of dynamic systems.
Essential Content
LO1 Determine the behavioural characteristics of materials subjected to complex loading
Characteristics of materials:
Definition of Poisson’s Ratio and typical values of metals, plastics and composite materials
The relationship between the elastic constants such as Bulk Modulus,
Modulus of Elasticity, Modulus of Rigidity and Poisson’s Ratio
Characteristics of two-dimensional and three-dimensional loading
Calculation of volumetric strain and volume changes
Concept of principal stress and strain
Failure criteria for ductile and brittle materials
Use of problem-solving tools within the context such as Root Cause Analysis (RCA) Process Failure Modes Effects Analysis (PFMEA), Fishbone, and Practical Problem Solving (PPS) and Advanced Product Quality Planning (APQP).
LO2 Assess the strength of loaded beams and pressurised vessels
Strength:
The relationship between bending moment, slope and deflection in beams
Calculating the slope and deflection for loaded beams using Macaulay’s method
Analysing the stresses in thin-walled pressure vessels and stresses in thick-walled cylinders
Use of computer simulations to model the behaviour of beams.
LO3 Analyse the specifications of power transmission system elements
Specifications:
Flat and v-section belt drive theory
Operation of friction clutches with uniform pressure and uniform wear theories
Bending and contact stress in geared systems
Principles of both epicyclic and differential gearing, and the torque required to accelerate these systems
Areas of failure when transmitting power mechanically.
LO4 Examine operational constraints of dynamic systems
Operational constraints:
Design of mechanical components to meet operating specifications, displacement and velocity
Operating principles of flywheels to store mechanical energy
Balancing of rotating mass systems
Single degree of freedom (DOF) free and damped vibration.
Learning Outcomes and Assessment Criteria
| Pass | Merit | Distinction |
| LO1 Determine the behavioural characteristics of materials subjected to complex loading |
D1 Critique the behavioural characteristics of materials subjected to complex loading. |
|
| P1 Discuss the relationship between the elastic constants.
P2 Illustrate the effects of two-dimensional and threedimensional loading on the dimensions of a given material. P3 Determine the volumetric strain and change in volume due to three-dimensional loading. |
M1 Assess the effects of volumetric thermal expansion and contraction on isotropic materials. | |
| LO2 Assess the strength of loaded beams and pressurised vessels |
D2 Justify the choice of a suitably sized universal beam, using appropriate computer software to model the application by explaining any assumptions that could affect the selection. |
|
| P4 Evaluate the variation of slope and deflection along a simply supported beam.
P5 Assess the principal stresses that occur in a thin-walled cylindrical pressure vessel and a pressurised thick-walled cylinder. |
M2 Refine the selection of a suitable size universal beam from appropriate data tables which conforms to given design specifications for slope and deflection. | |
| Pass | Merit | Distinction |
| LO3 Analyse the specifications of power transmission system elements |
D3 Evaluate the conditions needed for an epicyclic gear train to become a differential, showing how a differential works in this application. |
|
| P6 Discuss the initial tension requirements for the operation of a v-belt drive.
P7 Analyse the force requirements to engage a friction clutch in a mechanical system. P8 Analyse the holding torque and power transmitted through epicyclic gear trains. |
M3 Critically analyse both the uniform wear and uniform pressure theories of friction clutches for their effectiveness in theoretical calculations. | |
| LO4 Examine operational constraints of dynamic systems |
D4 Critically evaluate different choices of mechanical systems that induce specified motion, including the advantages and disadvantages of each application. |
|
| P9 Examine the profiles of both radial plate and cylindrical cams that will achieve a specified motion.
P10 Determine the mass of a flywheel needed to keep a machine speed within specified limits. P11 Investigate the balancing masses required to obtain dynamic equilibrium in a system. |
M4 Evaluate the effects of misalignment of shafts and the use of problemsolving tools to prevent problems from occurring. | |
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