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  • Users: jds22
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  1. jds22

    Intake Silencing Techniques

    Some things to consider in the intake system. 1. Shell noise from the expansion chamber 2. Inline Helmholtz effect of expansion chamber and dirty side duct (see Mann & Hummel paper SAE 2001-01-1431) 3. Duct lengths - these will amplify noise at resonances 4. Expansion lengths - these will not...
  2. jds22

    Intake Silencing Techniques

    Superfry, What rpm is the generator working at? This gives the dominant frequency of induction noise as it is the induction stroke that creates the pressure pulse. As Rob45 says 1800rpm would have a strong peak at 30Hz, but as it would be a 4 stroke cycle the dominant noise in this case would...
  3. jds22

    Differences between the run up and run down in a rotor

    What is the driving force during acceleration? Is this completely smooth? Or will it be a certain number of pulses per rev? Even an electric motor may not be completely smooth poles etc and therefore there may be impacts from the the driving force during acceleration... If these force...
  4. jds22

    Muffler Design - Turbocharged

    On a 660cc petrol or diesel I should imagine the turbo will be being used more regularly than not. What is the max rpm? How many cylinders does the car have? These will effect the dominant harmonics of the engine firing frequency. 4 cylinder -> 2 pulses per rev therefore second order...
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