Sách Engine noise

Contents
20.1 Introduction
20.2 Theory and definitions
20.2.1 Amplitude
20.2.2 Effect of distance on sound pressure level
20.2.3 Frequency and wavelength
20.2.4 Sound power level
20.2.5 Addition and subtraction of sound sources
20.2.6 Averaging decibel levels
20.2.7 Calculating relative levels
20.2.8 Weighting curves
20.2.9 Noise dose level
20.3 Legislation
20.3.1 On-highway vehicles
20.3.2 Off-highway machines
20.4 Measurement and analysis of noise
20.4.1 Measurement environments
20.4.2 Equipment
20.4.3 Frequency analysis
20.4.4 Tracking analysis
20.4.5 Sound quality analysis
20.5 Noise characteristics of diesel engines
20.5.1 Engine overall noise levels
20.5.2 Assessment of combustion noise
20.5.3 Assessment of mechanical noise
20.5.4 Engine radiated noise
20.5.5 Vehicle and machine noise assessment
20.6 Methods for control of diesel engine noise
20.6.1 Combustion noise
20.6.2 Mechanical noise
20.6.3 Predictive analysis
20.6.4 Palliative treatments and enclosures
20.6.5 Vehicle and machine refinement



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