Vibration and Acoustic Analysis Capabilities
Earth Dynamics has more than twenty-five years of experience conducting a
wide range of vibration and acoustic related studies. Examples of
recently completed studies include final environmental impact
analysis for construction of an extension to the light rail system
in Portland, Oregon, remote monitoring of vibration levels at
sensitive equipment locations during construction projects, on-going
monitoring and analysis of vibrations from quarry operations
throughout the Pacific Northwest, vibration analysis of quarry
operations in support of land use applications for quarry
operations. Earth Dynamics is also an “on-call” vibration and
acoustic contractor for the Tri-County Metropolitan Service district
in Oregon.
Earth Dynamics routinely provides remote vibration monitoring with
instant notification. Remote monitoring is a cost effective method
for monitoring vibration emissions from construction and quarry
operations. Monitoring seismographs are connected to Earth
Dynamics' office based server via wireless or land-line telemetry.
Text and/or email messages are immediately sent to key personnel if
measured vibrations exceed established limits. Call us to
discuss your short term or long term vibration monitoring needs.
Earth Dynamics maintains a large inventory of accelerometers and
frequency analysis instrumentation. This equipment is capable
of measuring vibrations from 0.2 micro-g to one thousand g.
Spectral analysis is typically used to evaluate ambient
micro-vibration levels, conduct transfer mobility testing, or to
perform machinery diagnostics.
Vibration and Acoustic Services
|
Vibration monitoring during pile-driving |
Remote monitoring seismograph installation. The tri-axial geophone is buried in the soil and the electronics are housed in a weatherproof enclosure. |
Current Equipment List
|
Selected Vibration and Acoustic Projects
CLIENT | DESCRIPTION |
BLASTING: | |
ASI Construction/US Army Corps of Eng., Blue River, OR | Blast and pressure monitoring during lake tap at Cougar Dam, Blue River, OR |
Knife River Corporation, Portland OR | Vibration monitoring during production blasting at basalt rock quarries in the Portland Metropolitan area. |
US Army Corps of Engineers and Guy F. Atkinson Co. San Francisco, CA | Installed borehole accelerometers, reviewed blast designs and monitored blast vibrations during excavation of basalt near Bonneville Dam, OR |
CONSTRUCTION: | |
Hamilton Construction, ODOT | Vibration monitoring during pile driving for Interstate 5 widening project in North Portland. |
City of Portland Water Bureau | Long term remote vibration monitoring during installation of a water line in SE Portland, Oregon. |
Morrison-Knudsen Corp. and South Corridor Constructors. Tri-Met Light Rail Portland, OR | Vibration monitoring and analysis during pile driving and other construction activities to ensure that nearby structures are not impacted by construction and operation of new Light-Rail corridors. |
Granite Construction and US Army Corps of Engineers Portland, OR | Evaluation of vibrations due to excavation of a tunnel through John Day Dam, OR |
H.S. Wright Construction and Pittsburgh Testing Lab Portland, OR | Evaluation of the effects of pile driving vibrations on 'green' concrete at U.S. Bank Tower, Portland, OR |
ENVIRONMENTAL IMPACT STUDIES: | |
TW Environmental and Tri-Met. Portland, OR | Evaluation of potential vibration impact of proposed South Corridor Light Rail in Portland, OR. Study included transfer mobility testing in accordance with Federal Transit Authority guidelines. |
SITE EVALUATIONS: | |
Oregon Natural Gas Co. Portland, OR | Monitoring and evaluation of possible ground motions associated with underground gas storage. |
SEH America and Performance Contracting Inc. Vancouver, WA | Analysis of building vibrations to certify vibration levels in a new clean room. Vibrations of sensitive instrumentation were also evaluated and design recommendations were provided. |
Siltec Silicon and Takenaka (USA) Portland, OR | Evaluation of ambient ground vibrations and noise prior to construction of a silicon wafer plant. Vibration isolation design recommendations were also provided. |
Port of Portland and Geoengineers, Inc. Portland, OR | Monitoring and evaluation of ground vibration and air overpressure near the Portland International Airport. |
EQUIPMENT ANALYSIS: | |
Oregon Iron Works, Inc., Portland, Oregon | Vibration analysis of nuclear waste shield doors during factory acceptance testing. |
IPEC Planar and Intel Corp. Portland, OR | Vibration analysis of bearings in silicon wafer polishing machines. |
ShinEtsu, SEH America Vancouver, WA | Vibration analysis of silicon wafer slicing machine. Data were used to help improve production rate. |
SAIF Corporation Portland, OR |
Analysis of the vibration produced by a chain saw. These data were used to help determine the validity of a worker’s compensation claim for vibration disease. |
Pacific Fluid Systems Portland, OR | Vibration analysis of plywood lathe. Special attention was given to evaluation of the effects of lathe vibrations on servo hydraulic valves. |