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BK50A2200DESIGN METHODOLOGIES AND
APPLICATIONS OF MACHINE ELEMENT DESIGN
Introduction and contents of the course
D.Sc Harri Eskelinen
Briefly about the lecturer…• Harri Eskelinen, GSM +358 40 1979 280, email:harri.eskelinen@lut.fi• Senior Research Scientist at LUT since 1999, before that lecturer and assistant
since 1985. • Since 2011 nominated as an adjunct professor.• Since 2014 Head of the Master Degree Programme in Mechanical Engineering• D.Sc 1999• Main research topics:
– DFMA– MW-mechanics– Green technology in material selection– Distance learning
• Supervising following courses:– Technical Drawing and 3D-modelling– Material Science– Engineering Design and Mechanisms– Machine Element Design– Research Methods and Methodologies
Aim of the course
• To provide understanding of functions and dimensioning of the most important mechanisms and their machine parts, such as:– Springs– Shafts– Bearings– Slides– Gears– Different types of fasteners
Contents of the course
• Basic mechanisms types• Mechanisms analysis and synthesis• Analysis of some selected machine parts• Reliability based machine design and lifetime analysis• Wear phenomena• Fundamentals of systematic design approach• Practical applications from industry
Practical arrangements
• Teaching and teaching material is divided into three main sections:
LecturesSpecial topics ofEngineering design- Systematic Design- Mechanisms analysis and synthesis- Wear phenomena
1
Text Books-Erdman:Fundamentals of mechanisms design-Norton: Design aspects of some important machine elements
2
Exercises andTeamworkPractical applicationsfrom industry
3
BK50A2200
DESIGN METHODOLOGIES AND APPLICATIONS OF MACHINE ELEMENT DESIGN
Glued joints
Distribution analysis
Shaft-hub-joints with conical geometry
Types of lubrication
Wear phenomena
Helical compression springs
Power transmission shafts
Rotational shaft sealing washers
Shaft keys
Worm gears
Spur gears
Rolling bearings
Introduction
Belt drives
Roller chain drives
Stress and deflection analysis
CONTENT
Main criteria dealing with lifetime evaluation
• S-N-curves• fatigue failure•crack propagation • lifetime evaluation equations
Main criteria dealing with reliability
• Distributions - loads - load bearing capacity - dimensions - material properties• Distribution analysis - curve fitting - overlapping distributions• Safety factors• Failure mode matrixes and fault tree analysis
Main criteria dealing with strength
• combined loading cases• dynamic/static loads• impact loading • stress concentrations and peaks • brittle and ductile materials • dynamic contact stresses
Main criteria dealing with wear
• Adhesive wear• Abrasive wear• Tribochemical wear• Surface fatigue• Pitting • Corrosion phenomena • Fretting • Cavitation, Erosion•Peeling
INTRODUCTION
BK50A2200 DESIGN METHODOLOGIES AND APPLICATIONS OF MACHINE ELEMENT DESIGNSchedule / autumn semester 2014 /
1ST PERIOD: LECTURES ON FRIDAYS AT 12.15-14.00 IN ROOM 213 IN STUDENTS’ UNION HOUSE
Week Lectures(Fridays 12.15-14.00, room 213 Students’ Union House)
Homework(Discussed during the lectures)
Project/Team work
37(8.9.- 14.9.2014)
Introduction and guidelines of the university course module BK50A2200
Organization of the project team and working groups
38(15.9.- 21.9.2014)
L1. Fundamentals of the systematic design approach
39(22.9.- 28.9.2014)
L2. Introduction to the textbook:“Norton: Machine Design”
Discussion of the homework results:E1. Comparison of different design approaches and requirement lists
40(29.9.- 5.10.2014)
L3. Reliability based machine design and lifetime analysis Discussion of the homework results::E2. Integration of strength, reliability, lifetime and wear analyses
Tentative project meeting I(arranged by the project manager)
41(6.10.- 12.10.2014)
L4. Wear phenomena
Discussion of the homework results:E3. Reliability based machine design
42(13.10.-19.10.2014)
L5. Machine elements IL6. Machine elements II
Discussion of the homework results:E4. Wear phenomena
L7. Machine elements IIIL8. Machine elements IV
Discussion of the homework results:E5. Shafts, bearings, shaft sealsE6. Gears
Tentative project meeting II(arranged by the project manager)
(43)(20.10.- 26.10.2014)
No lectures nor exercises (Exam week)
2ND PERIOD: PROJECT WORK ON FRIDAYS AT 8.15-10.00 IN ROOM 213 IN STUDENTS’ UNION HOUSE
Meeting number: Theme
44(27.10.- 2.11.2014)
Official project meeting I Requirement list
45(3.11.- 9.11.2014)
Official project meeting II Strength
46(10.11.- 16.11.2014)
Official project meeting III Wear
47(17.11.- 23.11.2014)
Official project meeting IV Reliability
48(24.11.- 30.11.2014)
Official project meeting V Lifetime
49(1.12.- 7.12.2014)
Presentations of the team works
Exercises and teamwork• Teamwork
– Project work, the whole class forms the project team, which consists of smaller groups (4-5 students/group)
– Weekly project meetings, Patricia Nyamekye has been nominated as the project manager and she will invite the meetings
• Brief exercises – Brief exercises will be giving after each lecture and the answers will be
discussed at next week’s lectures– Based on the topic of each lecture– All kind of source material is allowed– 100% requirement for acceptance!
• Presentations of the results of the teamwork (project work)– Week 49– Topics will be decided in details during the project meetings
• No written exam, the grading is based on the results of exercises and team works.
Project work
Team 1Gears
Team 4Shafts andShaft-hub-joints
Team 3Seals
Team 2Bearings
Team 5”Accessories”-belt-drives-chain-drives-clutches-etc.
Project manager
Team leader 1 Team leader 4Team leader 2 Team leader 3 Team leader 5
Team 1Gears
Team 4Shafts andShaft-hub-joints
Team 3Seals
Team 2Bearings
Team 5”Accessories”-belt-drives-chain-drives-clutches-etc.
Project manager
Team leader 1 Team leader 4Team leader 2 Team leader 3 Team leader 5
StrengthWearLifetimeReliability
Power transmission capacityWearLifetimeReliability
StrengthWearLifetimeReliability
StrengthWearLifetimeReliability
StrengthWearLifetimeReliability
StrengthWearLifetimeReliability
Team members 1…4 Team members 1…4 Team members 1…4 Team members 1…4 Team members 1…4
Machine elementMachine element
StrenghtStrenght
WearWear
LifetimeLifetime
RELIABILITY
RELIABILITY
Team leaders’ task is to take care of the overlapping areas
RELIABILITY
RELIABILITY
Power transmission capacityPower transmission capacity
Wear and lifetimeWear and lifetime
Project manager’s task is to take care of the overlapping areas and the summarized reliability aspects
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