Mei Wu Acoustics

Projects > Floor Vibration in High-Tech Facilities

Mei Wu Acoustics has been providing floor vibration consulting services for over ten years. Our input on projects with vibration sensitive equipment typically includes a prediction of floor vibration using either finite element analysis or structural dynamic calculations and measurement at existing building sites. Vibration sources have included pedestrians, MEP systems, parking garages, rooftop helipads, and nearby transportation facilities (e.g. roads, railways, and airports).

The following is a list of example projects:

Seagate Fremont R&D Building
Seagate is one of the leading storage device companies that uses specialized vibrational and noise sensitive research equipment to provide the quality products that they release. We are responsible for all aspects of vibration control and design. We provide a floor vibration survey, establish vibration criteria for the sensitive R&D tools for and predict floor vibration and provide input for floor, sub-structure, access floor structure, and pedestal design.

MWA did a variety of work for this 85,000-square-foot Research and Development Building including a floor vibration study for vibration sensitive (VC-A) laboratory equipment , MEPT vibration control, and providing comprehensive vibration guidelines.

University of Houston
This four-story 120,000-square-foot building will consist of seven vibration-sensitive laboratories that have criteria of VC-C to VC-D on slab on grade and suspended floors. We conducted a ground vibration survey, floor vibration study, and provided floor design recommendations and MEPT vibration control.

PDF Solutions
We conducted a vibration study for a building within close proximity to a light rail line and a highway. After monitoring the vibration levels and reviewing the vibration specifications we determined that the new vibration sensitive equipment would be able to be safely installed.

BioMed Realty
MWA conducted a construction vibration study to predict the effect of demolition activities next to a sensitive BMR tenant. During demolition a permanent vibration monitoring station was installed within the sensitive laboratory building to maintain a full ground vibration record for the duration of construction. The monitoring results were analyzed to yield daily spectrum percentile distribution and overall vibration level versus time.

We have performed several evaluations of a slab-on-grade vibration-sensitive biomedical precision manufacturing facility in San Ramon, CA. The project involved short term evaluation of simulated vibration sources, as well as long-term monitoring and source identification. The data was evaluated for comparison to four tool-specific vibration criteria.

Lockheed Martin Building 245
This is a two-story combined laboratory and office building housing vibration sensitive research tools with vibration criteria at VC-E and lower. Our scope of work included the full scope of work in the fields of acoustics and vibration, including floor vibration control to meet the stringent vibration criteria.

HP Labs SEM Ion Laser
Our work on this project assesses the installation site of a new 0.35nm resolution Scanning Electron Microscope (SEM) and ion beam tool. We assisted the design team in meeting the strict noise and vibration criteria.

Tri-Service Research Lab
This 181,000-square-foot facility was built to house Navy and Air Force research programs that address the health and safety effects of exposure to a variety of stressors. We were responsible for all aspects of noise and vibration control on the project.

Loyola Marymount University Science Center
This science center building contained offices, general labs (vibration criterion VC-A), and special labs with AFM, SEM, and NMR tools (VC-E) on suspended floor above a parking garage. An FEA study was conducted to predict floor vibration at general lab spaces as well as predicting vibration impact from underground parking to the most sensitive equipment on 3rd floor. MWA was also the acoustics and vibration consultant for the overall project.

Lemmen-Holton Cancer Pavilion (2005), Helen DeVos Children’s Hospital (2006), Texas Children’s Hospital Maternity Center (2007), Nationwide Children’s Hospital (2007)
These four hospital projects 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. We were responsible for floor vibration design.

Genentech Buildings 46, 47 and 48 (2006)
This project includes the tenant improvement of three existing buildings total 228,000 square feet with laboratories, offices, conference rooms, among other spaces. Major mechanical systems, such as chillers, cooling towers, boilers, pumps, air handling units and exhaust fans, are installed on the roof. Mei Wu Acoustics’ responsibilities include rooftop MEP system noise control and floor vibration analysis.

409 & 499 Illinois Street, San Francisco (2006)
These two laboratory/office buildings were both five-floor towers above two levels of parking. The total leasable space is 450,000 square feet. The target tenant was a mixture of office and life sciences with an emphasis on biotech laboratories. The floor design had to be suitable for biotech laboratories and cost-effective. Mei Wu Acoustics established FEA models for the building and studied vibration impact from footfalls on corridors, from vehicles on parking levels, and from rooftop mechanical systems.

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.

UCSD Mayer Hall (2003)
Mei Wu Acoustics was the consultant in all areas of acoustics and noise and vibration control. In addition, we ensured that vibration criteria of VC-D / VC-E for the ground floor and VC-A for upper floors were met.

Stanford University Mechanical Labs (1999), Stanford Biological Chemistry Labs (2000)
Mei Wu’s work included general labs which were required to meet the VC-A criterion and a Microstructure & Sensors Lab which was required to meet VC-E criterion on suspended floors. (This work was conducted by Mei Wu prior to the establishment of Mei Wu Acoustics.)