JPH02309899

Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH02309899
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
anti-vibration device for preventing transmission of vibration from a mounting base to a
transducer used in an underwater vehicle, ship or the like, resulting in noise. [Conventional
problems and problems to be solved by the invention] Conventionally, it has been considered that
this type of vibration-proof structure uses vibration-proof rubber etc. However, in the case of an
underwater vehicle, ship etc. Since the anti-vibration rubber is crushed at this point and the antivibration effect is lost, no special anti-vibration structure has been adopted. However, there has
been a problem that mechanical vibration such as engine vibration is transmitted to the
transducer via the mount and the mounting seat, which adversely affects the performance of the
transducer. The present invention has been made in view of the above-described conventional
circumstances, and an object of the present invention is to provide a vibration-damping device
capable of effectively preventing vibration transmission to a transducer. [Means for Solving the
Problems] The vibration control device for a transducer according to the present invention
comprises a piezoelectric element interposed between a mounting seat of the transducer and a
pedestal, and the mounting seat and the pedestal respectively. A feedback controller for
suppressing the vibration of the mounting seat by applying, to the piezoelectric element, a
voltage that generates vibration of the opposite phase to the vibration of the gantry based on the
vibration detected by the acceleration sensor attached; It is characterized by having. That is,
based on the frequency and the amplitude of the mount vibration measured by the acceleration
sensor, a voltage is applied to the piezoelectric element in the reverse phase to the vibration to
vibrate the mounting element so as to minimize the vibration of the mounting seat. The present
invention will be specifically described based on the following examples. FIG. 1 shows an
embodiment of the present invention applied to a underwater vehicle transducer. As shown, the
piezoelectric element 1 is interposed between the rack 2 and the transducer mounting seat 3. An
04-05-2019
1
acceleration sensor 4 is attached to the gantry 2, and an acceleration sensor 5 is attached to the
mounting seat 3. The piezoelectric element 1 and the acceleration sensors 4 and 5 are connected
to a feedback controller 6. The feedback controller 6 is based on the data of the frequency and
amplitude of the vibration of the table output from the acceleration sensor 4 of the table. A
voltage is applied to the piezoelectric element 1 so that the vibration and the phase are opposite
to each other, and feedback control is performed so as to minimize the output of the acceleration
sensor 5 of the mounting seat (that is, the first vibration). In the figure, reference numeral 7 is a
vibrator, and reference numeral 8 is an acoustic rubber, which constitute a transducer. As shown
in the control block diagram of FIG. 3, the vibration control device of the above configuration
includes the amplitude A of the frame 2, the thickness amplitude B of the piezoelectric element 1,
and the vibration target value G of the amplitude C1 mounting seat 3 of the mounting seat 3,
Based on the control voltage H of the piezoelectric element 1, vibration isolation of the mounting
seat 3, that is, the transducer, with respect to the vibration of the gantry 2 is performed.
That is, as shown in FIG. 4, the piezoelectric element 1 is driven by the control voltage and
vibrated in the opposite phase at the same frequency as the vibration A of the gantry 2 and the
vibration C of the mounting seat 3 due to the cancellation of both the vibrations A and B.
Minimize. FIG. 2 shows another embodiment of the present invention applied to a ship
transducer. Also in the present embodiment, a feedback controller is provided based on the
outputs from the acceleration sensors 4 and 5 mounted on the pedestal 2 and the attachment
seat 3 with the piezoelectric element 1 interposed between the pedestal 2 and the attachment
seat 3 6 feedback-controls the control voltage of the piezoelectric element 10, and the vibration
of the mounting seat 3 is minimized as in the above embodiment. [Effects of the Invention] As
described above, the present invention mounts the piezoelectric element between the transducer
mount and the mount so as to apply the vibration in the opposite phase to the vibration of the
mount to the piezoelectric element. Vibration transmission can be effectively prevented, and the
performance of the transducer can be maintained in a desired state.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a longitudinal sectional view of an embodiment in which the present invention is applied
to a transducer for underwater vehicles, and FIG. 2 is a longitudinal sectional view of an
embodiment of a pond in which the present invention is applied to a transducer for ships. FIG. 3
is a block diagram of a control system, and FIG. 4 is a graph showing the vibration state of each
04-05-2019
2
part.
DESCRIPTION OF SYMBOLS 1 ........ Piezoelectric element, 2-,,,, Force α frame main row 3 .....
Transducer mounting seat, 4 ..... Mount frame acceleration sensor, 5 ... Acceleration sensor of the
waver mounting seat, 6 ····························································································> · · · Amplitude of
piezoelectric element, C · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · ·. Patent applicant Nippon Electric Co., Ltd. Attorney Patent attorney Kiyoshi
Tatsui-Fig. 13 Sword 2
04-05-2019
3