Volume 4, Number 1, March, 1996 - Noise News International

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LARGE AND RAPID CHANGESIN PRESSURE PRODUCE"CAVITATION" NOISEWhen large pressure drops occur rapidly inliquids, the bubbles produced immediatelyimplode - explode inwards. The result is aroaring noise - and strong vibrations. This socalledcavitation noise is most common inhydraulic systems. Cavitation can be avoided bybringing about the pressure reduction in severalsmall steps.Principlelow pressure40 Noise/News International 1996 March
Application with pumps and valveshydraulicpwnppressurereducinginsertcontrolvalveExampleIn a hydraulic system, the full pump capacityis employed only in exceptional cases.Usually, the pressure is greatly reduced usinga control valve. Cavitation can then arise,producing loud noise from the valve. Thenoise is conducted as solid-borne sound toconnected machines and building structures.pressure reducing insertControl MeasureA pressure-reducing insert is placed in thesame pipe as the control valve. The inserthas removable plates with differentperforations. The plates are selected so thatthe insert will not produce a greater pressuredrop than that required to prevent cavitation.removable plates1996 March NoiselNews International 41
Page 2 and 3: The Metady!!~TMAnechoic Wedge Syste
Page 4 and 5: • •I-Inee InternationalInstitut
Page 6 and 7: President's ColumnThe Need for Cons
Page 8 and 9: Editor's ViewIs Noise Part of the E
Page 10 and 11: FeatureProfessional Societies in th
Page 12 and 13: the United States of America (INCE/
Page 14 and 15: Arranged by the General Committee o
Page 16 and 17: acoustical environment and the prom
Page 18 and 19: elated to noise. These organization
Page 20 and 21: Table 1. Dates and locations of pas
Page 22 and 23: the Member Society meetings. These
Page 24 and 25: The INTER-NOISE 95 Proceedings are
Page 26 and 27: y distinguished acousticians from a
Page 28 and 29: companying persons may also wish to
Page 30 and 31: the prediction of road traffic nois
Page 32 and 33: • The role of mass-spring-mass re
Page 34 and 35: in hospitals in Saudi Arabia: a cas
Page 36 and 37: international airport, Malaysia. Di
Page 38 and 39: Inter-noise 96Name, organisation an
Page 40 and 41: THE INTER-NOISE SERIESThe INTER-NOI
Page 44 and 45: SOUND SOURCES SHOULDNOT BE PLACED N
Page 46 and 47: THICK, POROUS LAYERSABSORB BOTH HIG
Page 48 and 49: PeopleGold Medal KamerlinghOnnes Aw
Page 50 and 51: Asia-Pacific NewsA. Lawrence, Asia-
Page 52 and 53: BooksThe Nature and Technology ofAc
Page 54 and 55: and Isolation Materials, Grommets a
Page 56 and 57: five special sessions on all aspect
Page 58 and 59: I•Do your work faster and moreacc
Page 60 and 61: BIOACOUSTICSANSI S3.7-1995, Coupler
Page 62 and 63: TAGSlFirst ISO/CD 3747-Acoustics-De
Page 64 and 65: International Advertising ContactsB
Page 66 and 67: DIRECTORY OF NOISE CONTROL SERVICES
Page 68: INTUITIVE AND POWERFULACOUSTIC SOLU

Volume 4, Number 1, March, 1996 - Noise News International

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