Gears and Their Vibration 2nd Edition by Derek Smith ISBN 9781040077368 1040077366

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Product details:
ISBN 10: 1040077366
ISBN 13: 9781040077368
Author: Derek Smith

Gears and Their Vibration 2nd Edition Table of contents:

1. Causes of Noise

1.1 Possible causes of gear noise

1.2 The basic idea of transmission error

1.3 Gearbox internal responses

1.4 External responses

1.5 Overall path to noise

1.6 T.E.-noise relationship

References

2. Harris Mapping for Spur Gears

2.1 Elastic deflections of gears

2.2 Reasons for tip relief

2.3 Unloaded T.E. for spur gears

2.4 Effect of load on T.E.

2.5 Long, short, or intermediate relief

References

3. Theoretical Helical Effects

3.1 Elastic averaging of T. E.

3.2 Loading along contact line

3.3 Axial forces

3.4 Position variation

3.5 “Friction reversal” and “contact shock” effects

3.6 Noload condition

References

4. Prediction of Static T.E.

4.1 Possibilities and problems

4.2 Thin slice assumptions

4.3 Tooth shape assumptions

4.4 Method of approach

4.5 Program with results

4.6 Accuracy of estimates and assumptions

4.7 Design options for low noise

References

5. Prediction of Dynamic Effects

5.1. Modelling of gears in 2-D

5.2 Time marching approach

5.3 Starting conditions

5.4 Dynamic program

5.5 Stability and step length

5.6 Accuracy of assumptions

5.7 Sound predictions

References

6. Measurements

6.1 What to measure

6.2 Practical measurements

6.3 Calibrations

6.4 Measurement of internal resonances

6.5 Measurement of external resonances

6.6 Isolator transmission

6.7 Once per revolution marker

References

7. Transmission Error Measurement

7.1 Original approach

7.2 Batching approach

7.3 Velocity approach

7.4 High speed approach

7.5 Tangential accelerometers

7.6 Effects of dynamics

7.7 Choice of encoders

7.8 Accuracy of measurement

7.9 Worms and wheels and spiral bevels

7.10 Practical problems

7.11 Comparisons

References

8. Recording and Storage

8.1 Is recording required?

8.2 Digital versus analog

8.3 Current PC limits

8.4 Form of results

8.5 Aliasing and filters

8.6 Information compression

8.7 Archive information

References

9. Analysis Techniques

9.1 Types of noise and irritation

9.2 Problem identification

9.3 Frequency analysis techniques

9.4 Window effects and bandwidth

9.5 Time averaging and jitter

9.6 Average or difference

9.7 Band and line filtering and resynthesis

9.8 Modulation

9.9 Pitch effects

9.10 Phantoms

References

10. Improvements

10.1 Economics

10.2 Improving the structure

10.3 Improving the isolation

10.4 Reducing the T.E.

10.5 Permissible T.E. levels

10.6 Frequency changing

10.7 Damping

10.8 Production control options

References

11. Lightly Loaded Gears

11.1 Measurement problems

11.2 Effects and identification

11.3 Simple predictions

11.4 Possible changes

11.5 Anti-backlash gears

11.6 Modelling rattle

Motion

Tooth forces

Combined

Reference

12. Planetary and Split Drives

12.1 Design philosophies

12.2 Advantages and disadvantages

12.3 Excitation phasing

12.4 Excitation frequencies

12.5 T.E. testing

12.6 Unexpected frequencies

Reference

13. High Contact Ratio Gears

13.1 Reasons for interest

13.2 Design with Harris maps

13.3 Two-stage relief

13.4 Comparisons

13.5 Measurement of T.E.

References

14. Low Contact Ratio Gears

14.1 Advantages

14.2 Disadvantages

14.3 Curvature Problems

14.4 Frequency gains

15. Condition Monitoring

15.1 The problem

15.2 Not frequency analysis

15.3 Averaging or not

15.4 Damage criteria

15.5 Line elimination

15.5 Scuffing: Smith shocks

15.6 Bearing signals

References

16. Vibration Testing

16.1 Objectives

16.2 Hydraulic vibrators

16.3 Hammer measurements

16.4 Reciprocal theorem

16.5 Sweep, impulse, noise or chirp

16.6 Combining results

16.7 Coherence

17. Couplings

17.1 Advantages

17.2 Problems

17.3 Vibration generation

18. Failures

18.1 Introduction

18.2 Pitting

18.3 Micropitting

18.4 Cracking

18.5 Scuffing

18.6 Bearings

18.7 Debris detection

18.8 Couplings

18.9 Loadings

18.10 Overheating

References

19. Strength versus Noise

19.1 The connection between strength and noise

19.2 Design for low noise helicals

19.3 Design sensitivity

19.4 Buying problems

Units

Index

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