VIBRATION EVALUATIONS continued
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MITSUBISHI ELECTRIC POWER
PRODUCTS SOUTHERN CALIFORNIA EDISION SERRANO SUB-STATION, CITY OF
ORANGE:
AAC conducted FFT measurements and analyses of vibration
generated by high voltage transformers in the Serrano Sub-station. SCE
engineers suspected that a transformer was generating excessive
vibration when operated at certain voltage loads. AAC responded by
testing two transformers for vertical and horizontal vibration during a
controlled voltage test. The vibration velocity was measured for each
transformer simultaneously and individually to rule out interference
from the adjacent equipment. Analyses of the vibration data proved that
the suspect transformer was generating significantly higher vibration
levels than an acceptable unit.
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WDI REGARDING ODETICS
ELECTRONICS FACILITY, ANAHEIM:
Staff members conducted a long-term
vibration monitoring effort at the WDI facility located adjacent to the
Odetics Electronics Facility in Anaheim, California. Heavy truck and bus
movements along the access road were a source of interference with the
daily operations of vibration sensitive equipment within the clean room
and machining facility. The long term monitoring was supplemented by
field technicians who documented the time and event traffic to correlate
events with measurement data. Data analysis indicated that heavy buses
and delivery trucks would cause high vibration levels to be experienced
at the electronics facility. A vibration monitoring plan and
construction mitigation plan was developed to minimize the impact on the
Odetics facility and to allow for construction at the WDI facility.
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LOS ANGELES MTA RED LINE
CO352 NOISE AND VIBRATION STUDIES, LOS ANGELES:
AAC Staff previously
conducted vibration and noise measurements at the project site for
Mallcraft Inc. The monitoring was part of Noise Control and Monitoring
Plan for the CO352 Project Site. Impact analysis and assessment was
conducted with respect to the MTA’s noise and vibration standards.
Mitigation measures were recommended in a weekly report to reduce all
impacts.
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LOS ANGELES MTA RED LINE
CO390 NOISE AND VIBRATION STUDIES, LOS ANGELES:
AAC Staff members
provided noise and vibration consultant services for the CO390 Project
Site. A Noise Control and Monitoring Plan was prepared for Steiny and
Company to implement noise and vibration impact analysis and assessment
procedures with respect to the MTA’s noise and vibration standards.
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WDI VIBRATION STUDY, ANAHEIM:
A vibration technical study was prepared to evaluate existing vibration
impacts associated with construction of a parking lot and access road
located adjacent to a high tech electronics manufacturer. Long-term
vibration measurements were conducted to monitor the vibration during
construction and reduction measures were recommended to minimize the
impact during construction. A technical study was prepared which
summarized the results of the monitoring and recommended direction for
minimizing construction impacts to adjacent sensitive receptors.
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I-15 RECONSTRUCTION, SALT
LAKE CITY, UTAH:
An on-call vibration monitoring and control program was
created for the I-15 reconstruction in Salt Lake City, Utah. Vibration
studies were prepared to evaluate construction over 10 segments of the
proposed new roadway. For each study, extensive vibration monitoring was
conducted and analysis was performed on the proposed construction and
pile driving operations. Measured data were compared to FTA criteria to
determine impacts and evaluate damage potential. Mitigation measures
were recommended to minimize vibration impacts.
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LOS FELIZ SCHOOL NOISE AND
VIBRATION CONTINUOUS MONITORING STUDY, LOS ANGELES:
Design, installation
and maintenance of long term (3+ years), continuous noise and vibration
monitoring systems both inside and outside an elementary school across
from the Metro Red Line B 251 construction yard. A remote noise and
vibration monitoring system was setup to monitor construction noise and
vibration activities. Weekly and monthly reports were provided to
identify noise and vibration impacts from Metro Rail construction
activities.
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GRAND HOTEL VIBRATION STUDY,
ANAHEIM:
A vibration technical study was prepared to evaluate the
vibration impacts associated with implosion of the Grand Hotel in
Anaheim. Vibration measurements were conducted to establish baseline
vibration levels. Analysis was performed to predict vibration from
implosion operations. A technical study was prepared which summarized
the results of the monitoring and recommended direction for minimizing
impacts to adjacent sensitive receptors.
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VIBRATION IMPACT ASSESSMENT
OF HARBOR FREEWAY TRANSITWAY NORTHERN TERMINUS, LOS ANGELES:
The purpose
of this vibration study was to determine the existing levels of
earthborne vibrations in the area of the northern terminus of the Harbor
Freeway (I-110) transitway. The focus of the study was to document the
maximum earthborne vibrations for Orthopaedic Hospital and for Saint
John's Episcopal Church that is caused by truck pass-bys along I-110.
The results of this study were used to develop the construction
vibration monitoring criteria for the construction of the I-110
transitway. At Orthopaedic Hospital, a number of electron microscopes
are installed and used for various laboratory and research studies.
According to the information provided by Orthopaedic Hospital, the floor
on which the microscope is standing should be as free from vibrations as
possible. Saint John's Church is an historic building and high levels of
vibration could possibly cause building damage. Vibration measurements
for the Orthopaedic Hospital were conducted at the shoulder of I-110, at
a distance of approximately 3 m (10 feet) from the edge of the traveled
way, near the main building in a garden bed, on the floor of the room
that housed an electron microscope on the specimen chamber of the
electron microscope, and inside a surgery room. Vibration monitoring for
the Saint John's Church was conducted at the shoulder of I-110, at the
corner of the church main building, and on the raised church floor in
front of the altar.
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CHILDREN'S HOSPITAL BASELINE
AND CONSTRUCTION VIBRATION STUDY, LOS ANGELES:
Vibration measurements
were conducted in the neonatal care facility at the hospital to help
establish a baseline criterion for this sensitive infant treatment area.
In order to determine how close various pieces of heavy construction
equipment related to the Metro Rail Construction could operate next to
the hospital, ground vibration transfer measurements were conducted
while simultaneously measuring both inside and outside the hospital. The
data was used to re establish construction equipment limits.
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