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Experimental Investigation on the Flow-induced Noise under Variable Conditions for Centrifugal Pumps

Chinese Journal of Mechanical Engineering 2012年第3期25卷 456-462页

作者： YUAN Shouqi YANG Jun YUAN Jianping LUO Yin PEI Ji Research Center of Fluid Machinery Engineering and Technology Jiangsu UniversityZhenjiang 212013China

With extensively using of centrifugal pumps,noise generation in these pumps is increasingly receiving research attention in recent *** noise sources in centrifugal pumps are mainly composed of mechanical noise and flow-induced *** the study of flow-induced noise has become a hotspot and important domain in the *** flow-induced noise closely related to the inner pressure pulses and vibration of volute in pumps,therefore,it is necessary to research the interaction and mechanism among *** investigate the relationships,a test system is designed which includes a test loop and a measurement *** hydrophones and pressure sensors are installed on the outlet of the pump and vibration acceleration sensors are disposed on the pump *** these instruments,the signals of noise,pressure pulses and vibration are collected and *** results show that the level of flow-induced noise becomes smaller as the flow increment during low flow rate operations,and it is steadily close to the design point,then it increases with the growing of flow rate in high flow rate ***,there are some similar peak points in the power spectrum charts of noise,pressure pulses and *** broadband noise at low flow rate is mostly focused on the region of 0-40 times shaft frequency,which is mostly made by rotating stall and vortex;while the noise at high flow rate conditions is focused on the region of 60-100 times shaft frequency,which may be mostly made by *** proposed research is of practical and academic significance to the study of noise reduction for centrifugal pumps.

关键词： centrifugal pump flow-induced noise pressure pulses vibration of volute

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Dynamic pressures on Tunnel Roofs due to Vehicle Passages

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Sound & Vibration 2018年第4期52卷 6-8页

作者： James D.Barnes Ethan R.Brush Mark S.Newmark Eric E.Ungar Acentech Inc.33 Moulton StreetCambridgeMA02138USA

pressure and proximity measurements made in a tunnel indicate that a typical vehicle passage produced on the tunnel roof an initial pressure increase of small magnitude,followed by a sharp and more substantial drop in pressure below *** magnitude of the pressure drop was found to increase with smaller clearances between the vehicle top and the tunnel roof,consistent with the Bernoulli relation and the vehicle *** dynamic pressures potentially may have significant effects on the vibration and noise environments on the lower floors of“air rights construction”buildings that span highways.

关键词： pressure pulses vehicle passages tunnel roofs

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