Tunable damper for an acoustic wave guide
- Knoxville, TN
A damper for tunably damping acoustic waves in an ultrasonic waveguide is provided which may be used in a hostile environment such as a nuclear reactor. The area of the waveguide, which may be a selected size metal rod in which acoustic waves are to be damped, is wrapped, or surrounded, by a mass of stainless steel wool. The wool wrapped portion is then sandwiched between tuning plates, which may also be stainless steel, by means of clamping screws which may be adjusted to change the clamping force of the sandwiched assembly along the waveguide section. The plates are preformed along their length in a sinusoidally bent pattern with a period approximately equal to the acoustic wavelength which is to be damped. The bent pattern of the opposing plates are in phase along their length relative to their sinusoidal patterns so that as the clamping screws are tightened a bending stress is applied to the waveguide at 180.degree. intervals along the damping section to oppose the acoustic wave motions in the waveguide and provide good coupling of the wool to the guide. The damper is tuned by selectively tightening the clamping screws while monitoring the amplitude of the acoustic waves launched in the waveguide. It may be selectively tuned to damp particular acoustic wave modes (torsional or extensional, for example) and/or frequencies while allowing others to pass unattenuated.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4452334
- OSTI ID:
- 865028
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
damper
acoustic
wave
guide
tunably
damping
waves
ultrasonic
waveguide
provided
hostile
environment
nuclear
reactor
selected
size
metal
rod
damped
wrapped
surrounded
mass
stainless
steel
wool
portion
sandwiched
tuning
plates
means
clamping
screws
adjusted
change
force
assembly
section
preformed
length
sinusoidally
bent
pattern
period
approximately
equal
wavelength
opposing
phase
relative
sinusoidal
patterns
tightened
bending
stress
applied
180
degree
intervals
oppose
motions
provide
coupling
tuned
selectively
tightening
monitoring
amplitude
launched
damp
particular
modes
torsional
extensional
example
frequencies
allowing
pass
unattenuated
ultrasonic wave
wave guide
approximately equal
acoustic wave
nuclear reactor
stainless steel
acoustic waves
selected size
hostile environment
metal rod
ultrasonic waveguide
clamping force
wave motion
waveguide section
bending stress
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