december 2012 douglas p. taylor, president taylor … 12.pdf · douglas p. taylor, president taylor...
TRANSCRIPT
Founded in 1955 by Paul H. Taylor
Traditional business is 40% military with commercial products based on proven military designs
Product Lines Dampers Shock Absorbers Vibration Isolators Gun Mounts Shock Transmission Devices Fluid Springs Air Springs Shock Isolation Systems Satellite Deployment Systems
Taylor Devices Incorporated
The Concepts
Fluid Dampers: Dissipate energy within a system by converting it to heat. Damping forces are out of phase with structural stress.
Isolators: Provide a low frequency bypass or connection between masses. Isolators usually include damping and spring elements.
Reduced Deflection and Stress Reduce Contents Damage Improved Biodynamics Architectural Enhancement Reduced Cost
Improvement Areas
This presentation will introduce two long-standing axioms in the aerospace/defense community:
1. All shock and vibration is the same . . . It’s only the mass that changes.
2. To mitigate shock and vibration effects on a structure you must:
Know the Input
Bound the Output
Mitigate the Difference
Comparisons
Northridge Earthquake .9 g .9 m/s
Kobe Earthquake .8 g 1.3 m/s
Ship, Moored Mine 25.0 g+ 2.3 m/s+
Missile Silo, Nuclear Air Burst 80.0 g+ 11.4 m/s+
Submarine, Nuclear Depth Charge 600.0 g+ 12.7 m/s+
Peak Acceleration
Peak Velocity
Damped or Isolated Response to Forced Resonance
Critical Damping Ratio,
Magnification Factor = ζ21
ζ=CRC
C
Today’s large fluid dampers for seismic protection are Cold War era military and space technology which was commercialized, beginning in 1990, with approval. Major programs using high capacity dampers: Navy – Air Force –
Triple T Missiles, 1955 Atlas ICBM, 1959 F-8 Aircraft, 1955 KC10 Aircraft, 1975
Tomahawk Missile, 1979 MX ICBM, 1977 Seawolf Submarine, 1985 B-2 Stealth Bomber, 1986
Virginia Class Submarine, 1998 Army – NASA – CH54 Skycrane Helicopter, 1965 Apollo Program, 1962
M109A6 Paladin, 1986 Space Shuttle, 1977 THAAD Missile, 1990 Atlas V EELV, 2002
Seismic Dampers ~ Everything Old Is New Again
The Cold War had ended, Taylor Devices’ damping technology was declassified, so . . .
“Let’s take fluid dampers out of ballistic missile silos and put them in buildings for seismic, wind, and vibration protection.”
Doug Taylor, U/B 1971 David Lee, Caltech 1952
Seismic Testing at UB Steel Moment Frame Building
1-Story, No Dampers, El Centro 33.33%
Total Damping = 2%
1-Story, 2 Dampers, El Centro 100%
Total Damping = 22%
Seismic Testing at UB Steel Moment Frame Building
Comparison Testing in Japan at E-Defense Lab
Two identical full-size, five-story buildings Input was 100% of 1995 Takatori (Kobe)
earthquake E-Defense shake table is the largest on earth
Watch the videos and then answer this question: “Do dampers work?”
Project Overview
Including: 16 Airport Structures
19 Hospitals
15 Stadiums
Los Angeles and Hayward City Halls in California
San Francisco Civic Center
Tokyo-Rinkai Hospital
Jimbo-Cho Office Building, Tokyo
San Francisco-Oakland Bay Bridge
Millennium Bridge Retrofit in the U.K.
26 Tall Buildings, including the Petronas Twin Towers in Malaysia
~ 450 Buildings and Bridges to Date ~
Project Example
Arrowhead Regional Medical Center located in Colton, California
Base Isolation Dampers − New Build
Project Example
Pacific Bell Emergency Center located in Sacramento, California
Dampers in Chevron Braces − Retrofit
Project Example
Bill Emerson Memorial Bridge located in Cape Girardeau, Missouri
Main Deck-to-Pier Dampers − New Build
Project Example
Richmond-San Rafael Bridge located in San Francisco, California
Main Deck-to-Pier Dampers − Retrofit
Project Example
111 Huntington located in Boston, Massachusetts
Dampers in Toggle Braces − New Build
Project Example
Park Tower Hyatt located in Chicago, Illinois
Dampers at top floor in Tuned Mass Damper System − New Build
Project Example
Tokyo Rinkai Hospital located in Tokyo, Japan
Base Isolation Dampers − Design “borrowed” from Arrowhead Regional
Project Example
Baseball Stadium located in Seattle, Washington
Dampers in Roof Truss System − New Build
Project Example
Portland State University, or Smith Memorial Student Union Building located in Portland, Oregon
An “in-situ” retrofit of 118 Seismic Dampers without disrupting students
Fluid Dampers and Isolation for Seismic Protection:
New Structures will be better, and will cost less
Lifelines will be more survivable
Historic structures can be preserved
Existing structures can be simply upgraded
Conclusions
www.shockandvibration.com
www.taylordevices.com
Phone: 716.694.0800 Fax: 716.695.6015
www.seismicdamper.com
90 Taylor Drive, P.O. Box 748 North Tonawanda, NY 14120-0748
The Leader in Innovative Shock Control