كتاب Gear Noise and Vibration

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Gear Noise and Vibration
J Derek Smith

ويتناول الموضوعات الأتية :

Gearbox internal responses
External responses
Overall path to noise
TE-noise relationship
References
Harris Mapping for Spur Gears
Elastic deflections of gears
Reasons for tip relief
Unloaded TE for spur gears
Effect of load on TE
Long, short or intermediate relief
References
Theoretical Helical Effects
Elastic averaging of TE
Loading along contact line
Axial forces
Position variation
"Friction reversal" and "contact shock" effects
No-load condition
References
Prediction of Static TE
Possibilities and problems
Thin slice assumptions
Tooth shape assumptions
Method of approach
Program with results
Accuracy of estimates and assumptions
Design options for low noise
References
Contents
Prediction of Dynamic Effects
Modelling of gears in -D
Time marching approach
Starting conditions
Dynamic program
Stability and step length
Accuracy of assumptions
Sound predictions
References
Measurements
What to measure
Practical measurements
Calibrations
Measurement of internal resonances
Measurement of external resonances
Isolator transmission
Once per revolution marker
References
Transmission Error Measurement
Original approach
Batching approach
Velocity approach
High speed approach
Tangential accelerometers
Effect of dynamics
Choice of encoders
Accuracy of measurement
Worms and wheels and spiral bevels
Practical problems
Comparisons
References
Recording and Storage
Is recording required?
Digital v analog
Current PC limits
Form of results
Aliasing and filters
Information compression
Archive information
References
Contents xi
Analysis Techniques
Types of noise and irritation
Problem identification
Frequency analysis techniques
Window effects and bandwidth
Time averaging and jitter
Average or difference
Band and line filtering and re-synthesis
Modulation
Pitch effects
Phantoms
References
Improvements
Economics
Improving the structure
Improving the isolation
Reducing the TE
Permissible TE levels
Frequency changing
Damping
Production control options
References
Lightly Loaded Gears
Measurement problems
Effects and identification
Simple predictions
Possible changes
Anti-backlash gears
Modelling rattle
Reference
Planetary and Split Drives
Design philosophies
Advantages and disadvantages
Excitation phasing
Excitation frequencies
TE testing
Unexpected frequencies
Reference
xii Contents
High Contact Ratio Gears
Reasons for interest
Design with Harris maps
stage relief
Comparisons
Measurement of TE
References
Low Contact Ratio Gears
Advantages
Disadvantages
Curvature problems
Frequency gains
Condition Monitoring
The problem
Not frequency analysis
Averaging or not
Damage criteria
Line elimination
Scuffing - Smith Shocks
Bearing signals
References
Vibration Testing
Objectives
Hydraulic vibrators
Hammer measurements
Reciprocal theorem
Sweep, impulse, noise or chirp
Combining results
Coherence
Couplings
Advantages
Problems
Vibration generation
Contents xiii
Failures
Connection with vibration
Pitting
Micropitting
Cracking
Scuffing
Bearings
Debris detection
Couplings
Loadings
Overheating
References
Strength v Noise
The connection between strength and noise
Design for low noise helicals
Design sensitivity
Buying problems
Units
Index

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كتاب Gear Noise and Vibration 3622959917