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