Our experience includes vibration measurements and prediction in commercial, industrial and residential buildings using finite element analysis and structural dynamic calculations. Vibration sources include pedestrians, MEP systems, parking garage, rooftop helipad, nearby road and railway.

Stanford University Mechanical Labs (1999), Stanford Biological Chemistry Labs (2000)

Mei Wu’s early work includes general labs which meet the VC-A criterion (2,000 micro-inches per second) and the Microstructure & Sensors Lab which meets VC-E criterion (125 mips) on suspended floors.

UCSD Mayer Hall (2003)

Vibration criteria were VC-D (250 mips)/VC-E for the ground floor and VC-A for upper floors.

Stanford Hospital Clinical Laboratory Buildings (2004), Stanford Pathology Blood Center (2004), Buck Institute (2005)

These projects were to move microbiology, molecular pathology, virology labs into existing office buildings. The equipment had a vibration criterion of VC-A, but the offices were designed for maximum vibration of 20,000 mips. We evaluated the existing floor and made recommendations to meet the VC-A criteria without major changes to the structure.

409 & 499 Illinois Street, San Francisco (2006)

This building was composed of two 5-floor towers over two levels of parking. The total leasable space is 450,000 sqft. The vibration criterion was VC-A.

Lemmen-Holton Cancer Pavilion (2005), Helen DeVos Children’s Hospital (2006), Texas Children’s Hospital Maternity Center (2007), Nationwide Children’s Hospital (2007)

These hospitals had a combined square footage of 2,200,000 sqft. The vibration criterion of these buildings was VC-E for the rooms with AFM, SEM, and MRI on suspended floors, and VC-A for microsurgery and other labs.

Seagate’s TEM, SEM and Auger tool (2008-2009)

The vibration criterion of these tools was VC-E and slightly lower in some places.

Lockheed Building 214 (2008)

The vibration criteria are VC-C to VC-D for the ground level, and VC-A for suspended floor.

Tri-Service Research Lab (2009)

This 181,000-square-foot facility will house Navy and Air Force research programs that address the health and safety effects of exposure to a variety of stressors.

Loyola Marymount University Science Center (2009)

The vibration criterion is VC-A for general labs and VC-E for special labs with AFM, SEM, and NMR tools on suspended floor above parking garage. A finite element study is in progress.