BS ISO 10767-3:1999

1   Scope This part of ISO 10767 specifies a procedure for the determination of a rating of the source flow ripple , source impedance and pressure ripple levels generated by positive-displacement hydraulic motors, including bi-directional motors. Ratings are obtained as the following:

       a)  the  source flow ripple  amplitude, in cubic metres per second, over ten individual  harmonics  of  motoring frequency ; 
   
   
     
       b)  the  source impedance  amplitude, in newton seconds per metre to the power of five [(N·s)/m 5 ], and phase, in degrees, over ten individual  harmonics  of  motoring frequency ; 
   
   
     
       c)  the  anechoic pressure ripple  amplitude, in pascals, over ten  harmonics  of  motoring frequency ; 
   
   
     
       d)  the overall root mean square (r.m.s.)  anechoic pressure ripple , in pascals; 
   
   
     
       e)  the  blocked acoustic pressure ripple  amplitude, in pascals, over ten  harmonics  of  motoring frequency ; 
   
   
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