JP6950883B2 - Gypsy moth repellent device for ships, ships, and gypsy moth repellent methods - Google Patents

Description

The present invention relates to a gypsy moth repellent device for ships, a ship, and a gypsy moth repellent method.

Patent Document 1 describes a moth control device that controls moths using ultrasonic waves. In this moth control device, the output pattern having the ultrasonic wave wavelength region emitted by the bat is set to 2.0 to 6.6 Hz as the first ultrasonic pulse having the ultrasonic output of the first pulse duration as one pulse. A pulse that is repeatedly output as an output pattern that includes a pattern that is output in 1 and a pattern that outputs a second ultrasonic pulse at 20.0 to 33.3 Hz with the ultrasonic output of the second pulse duration as one pulse. It has an output means.

Patent Document 2 describes an ultrasonic generator in which a spherical vibrating radiator is coupled. This ultrasonic generator has an ultrasonic vibrator whose length is matched to 1/2 to approximately 1/2 of the ultrasonic vibration wavelength, and vibration that boosts and transmits the vibration of the vibrator with the same length as the vibrator. The booster is connected in series, and a solid spherical vibrating radiator having a diameter about twice the length of the vibrator is bonded or integrally formed at the tip of the booster.

Japanese Unexamined Patent Publication No. 2013-051925 Japanese Unexamined Patent Publication No. 2016-20053

Here, for example, Asian Gypsy Moth (hereinafter referred to as "AGM") is a forest moth that is widely distributed in Japan and overseas, and it is said that the egg mass of AGM laid on a ship hatches and invades at the port. There's a problem.
The present invention aims at providing marine gypsy moth repellent device capable repel gypsy moth, ship, and the gypsy moth repelling methods.

The marine mimaga repellent device according to the first invention according to the above object is a marine mimiga repellent device installed on a ship, in which the width and period of the first burst signal are set as the first condition, and the second burst. A condition setting unit in which the width and period of the signal are set as the second condition, and a signal generator that sequentially generates the first burst signal and the second burst signal defined by the first condition and the second condition, respectively. And a sound emitting unit that emits sound waves based on the first burst signal and the second burst signal generated by the signal generator, and the width of the first burst signal is 55 milliseconds or more and 65 mm. Second or less, the period of the first burst signal is 0.9 seconds or more and 2.1 seconds or less, the width of the second burst signal is 155 milliseconds or more and 170 milliseconds or less, and the period of the second burst signal. Is 0.9 seconds or more and 2.1 seconds or less .

In the marine gypsy moth repellent device according to the first invention, it is preferable that the sound wave radiating portion is installed via an elastic body at a position where the sound wave reaches the entrance of the passage leading to the cargo or the cargo compartment.

In the marine Maiga repellent device according to the first invention, the sound wave emitting unit includes a vibrating body and a spherical vibrating radiator that radiates sound waves in substantially all directions, and the diameter of the vibrating radiator is the vibrating body. It is preferable that the length in the longitudinal direction of is approximately twice.

The ship according to the second invention in line with the above object is provided with the gypsy moth repellent device for ships according to the first invention, and the sound wave radiating unit is located at a position where the sound wave reaches the entrance of the passage leading to the cargo or the cargo compartment. that it has been established through the elastic body.

The Maimaga repellent method according to the third invention according to the above object is a Maimaga repellent method using a marine Maimaga repellent device according to the first invention, and the width and period of the first burst signal are set as the first condition. Then, the condition setting step of setting the width and period of the second burst signal as the second condition, and the first burst signal and the second burst signal defined by the first condition and the second condition, respectively, are sequentially generated. a signal generation step of, the wave emission step of emitting sound waves based on the first burst signal generated by said signal generating step and the second burst signal, see contains the width of the first burst signal is 55 The first burst signal has a period of 0.9 seconds or more and 2.1 seconds or less, the width of the second burst signal is 155 milliseconds or more and 170 milliseconds or less, and the first burst signal has a period of milliseconds or more and 65 milliseconds or less. The period of the 2-burst signal is 0.9 seconds or more and 2.1 seconds or less .

According to the gypsy moth repellent device for ships, ships , and the gypsy moth repellent method according to the present invention , gypsy moth can be repelled.

FIG. 5 is a waveform diagram of a burst signal composed of two burst signals having a burst signal width of 162 milliseconds and a burst signal period of 1 second. It is a block diagram of the moth repellent device which concerns on one Embodiment of this invention. A burst signal with a burst signal width of 62 milliseconds and a burst signal period of 1 second, a burst signal width of 162 milliseconds, a burst signal period of 1 second, a burst signal width of 62 milliseconds, and a burst. It is a waveform diagram of a burst signal having a signal period of 1 second, and a burst signal (partially omitted from the illustration) composed of four burst signals having a burst signal width of 162 milliseconds and a burst signal period of 1 second. .. (A) and (b) are side views and plan views of a ship on which the moth repellent device according to the embodiment of the present invention is installed, respectively, and explanatory views showing an example of the arrangement position of the vibrating radiator. Is. It is a block diagram of the apparatus used for studying the reactivity of gypsy moth to a sound wave. It is a table which shows the result of the gypsy moth repellent behavior analysis in the outdoors. It is a graph which shows the result of the moth repellent behavior analysis in the outdoors.

Subsequently, an embodiment embodying the present invention will be described with reference to the attached drawings, and the present invention will be understood. It should be noted that the parts not related to the description may be omitted from the illustration.

1. 1. Definition "Burst signal width" means the duration (milliseconds) of burst signal emission, and "burst signal period" means the next burst signal from the start of emission of one burst signal. It means the time (seconds) until the start of radiation.
FIG. 1 shows a waveform of a burst signal composed of two burst signals having a burst signal width of 162 milliseconds and a burst signal period of 1 second.
Further, "sound wave" means a wave generated by elasticity.

2. Moth repellent device The moth repellent device 10 will be described with reference to the block diagram of the entire control system of FIG.
The moth repellent device 10 according to the embodiment of the present invention is mounted on, for example, a ship 20 (see FIG. 4), and can repel moths by radiating sound waves from the sound wave emitting unit 15.
Examples of moths that can be repelled by the moth repellent device 10 include Lymantriidae, Lymantriidae, Meiga, and Lymantriidae, and Lymantriidae can be preferably mentioned. Moth (AGM); Lymantria dispar) can be mentioned more preferably.
The moth repellent device 10 includes a condition setting unit 12, a signal generator 14, and a sound wave emitting unit 15.

The condition setting unit 12 sets the width and period of the burst signal defining the first burst signal and the second burst signal as the first condition and the second condition, respectively.
The setting range of the width of the first burst signal and the second burst signal is a range in which the moths are highly effective in repelling, for example, 50 ms or more and 200 ms or less.
However, the width of the first burst signal set in the first condition is preferably 50 milliseconds or more and 80 milliseconds or less, and more preferably 55 milliseconds or more and 65 milliseconds or less. The width of the second burst signal set in the second condition is preferably 100 milliseconds or more and 200 milliseconds or less, and more preferably 155 milliseconds or more and 170 milliseconds or less.
From the viewpoint of repelling moths in a wider range from the vibrating radiator 18, the absolute value of the difference in width between the first burst signal and the second burst signal set in the first condition and the second condition is, for example, 40 mm. It is seconds or more and 150 milliseconds or less, preferably 70 milliseconds or more and 120 milliseconds or less, and more preferably 90 milliseconds or more and 110 milliseconds or less.
On the other hand, the setting range of the period of the first burst signal and the second burst signal is, for example, 0.6 to 2.4 seconds, and preferably 0.9 seconds or more and 2.1 seconds or less.
The user can set the width and period of a specific burst signal in the condition setting unit 12, but the width and period of the specific burst signal may be set in the condition setting unit 12 in advance.

The signal generator 14 can generate a first burst signal and a second burst signal, respectively, based on the first condition and the second condition set in the condition setting unit 12.
Further, the signal generator 14 can also sequentially generate the first burst signal and the second burst signal as shown in FIG.
Further, the signal generator 14 sequentially generates a first burst signal, a first burst signal, and a second burst signal, and generates a burst signal that repeats these as one cycle, or a first burst signal and a second burst signal. A burst signal and a first burst signal are sequentially generated, and a burst signal that repeats these as one cycle is generated, or a second burst signal, a first burst signal, and a first burst signal are sequentially generated, and these are generated. It is also possible to generate a burst signal that repeats as one cycle.

For example, to sequentially generate the first burst signal and the second burst signal, it suffices if there is a step of generating the second burst signal after the step of generating the first burst signal, and immediately after the first burst signal. It is not limited to generating a second burst signal. Therefore, in the above cycle, the first burst signal is between the first burst signal and the first burst signal, between the first burst signal and the second burst signal, and between the second burst signal and the first burst signal. And a burst signal different from the second burst signal may be generated. As the burst signal different from the first burst signal and the second burst signal, the width of the burst signal is preferably 50 ms or more and 80 ms or less, or 100 ms or more and 200 ms or less, and the burst signal. The period is preferably 0.6 seconds or more and 2.4 seconds or less.
In addition, in order to enhance the effect of repelling flying moths, it is necessary to emit sound waves having a moth repellent effect at predetermined intervals. Therefore, the signal generator 14 serves as a first burst signal in 5 seconds as a burst signal having a width of 50 milliseconds or more and 80 milliseconds or less and a period of 0.6 seconds or more and 2.4 seconds or less, and a second burst signal. It is preferable to generate burst signals having a width of 100 milliseconds or more and 200 milliseconds or less and a period of 0.6 seconds or more and 2.4 seconds or less, respectively, at least once. For example, in 5 seconds, 1) burst signal width 62 ms and burst signal period 1 second, 2) burst signal width 62 ms, and burst signal cycle 1 second, 3) burst signal width 165 mm. It is preferable to sequentially generate a burst signal composed of 1) to 4) burst signals having a burst signal period of 2 seconds and a burst signal width of 165 milliseconds and a burst signal period of 1 second. ..

The sound wave emitting unit 15 has a vibrator (an example of a vibrating body) 16, a booster 17, and a vibrating radiator 18.
The vibrator 16 is a Rajuban type vibrator, one end of which is connected to the signal generator 14 via a connection cable 19, and the other end of which is connected to a booster 17. However, the vibrator 16 is not limited to the Rajuban type vibrator. The vibrator 16 may be, for example, a magnetostrictive ferrite type vibrator or a ceramic type vibrator.
By vibrating the vibrator 16 based on the burst signal generated by the signal generator 14, a sound wave transmitted in a burst waveform is generated in the vibrator 16.

One end of the booster 17 is connected to the vibrating radiator 18 to support the vibrating radiator 18. The sound wave transmitted by the burst waveform generated by the vibrator 16 is transmitted to the vibrating radiator 18 via the booster 17.

The vibrating radiator 18 is a spherical vibrating radiator that radiates sound waves in all directions. The diameter is approximately twice the length of the oscillator 16 in the longitudinal direction and is made of stainless steel. However, the oscillating radiator 18 is not limited to being made of stainless steel. The vibrating radiator 18 may be another metal such as aluminum or titanium.
The term "omnidirectional" here does not mean omnidirectional in a strict sense. That is, "omnidirectional" is referred to as "substantially omnidirectional" which is all directions other than the direction in which sound waves are not radiated due to design and manufacturing reasons and all directions other than the portion supporting the vibrating radiator 18. Meaning, for example, when the vibrating radiator 18 is supported by the booster 17, it means all directions except the portion connected to the booster 17 (the same applies hereinafter).
Examples of the spherical vibrating radiator that radiates sound waves in all directions include the spherical ultrasonic vibrator described in Patent Document 2. By using a spherical vibrating radiator that radiates sound waves in all directions as the vibrator 16, sound waves transmitted in a burst waveform are radiated in all directions on the outer surface of the vibrator 16.

The frequency of the burst waveform constituting the sound wave radiated from the vibrating radiator 18 is 40 kHz. However, the frequency can be set to 2 kHz or more and 60 kHz or less, and by setting the frequency to 20 kHz or more and 60 kHz or less, it is possible to prevent humans from making noise as sound.

3. 3. In order to install the ship moth repellent device 10 on the ship 20, the sound wave radiating portion 15 of the moth repellent device 10 is fixed via an elastic body such as a wire spring. By installing the sound wave emitting unit 15 on the ship 20 via the elastic body as described above, even if the installed ship 20 vibrates due to navigation, the sound wave radiated from the vibrating radiator 18 vibrates. It is possible to prevent being affected by the vibration of the body 18 itself. Further, it is possible to prevent the attachment for attaching the sound wave radiating unit 15 to the ship 20 from loosening or the sound wave radiating unit 15 itself from breaking down due to the vibration of the ship 20 to be installed. In particular, when the sound wave emitting unit 15 is installed on the ship 20 so that the spherical vibrating radiator 18 is located above the vibrator 16, the center of gravity of the sound wave emitting unit 15 is located close to the vibrating radiator 18. Therefore, it is effective to use an elastic body as described above because it is unstable. The condition setting unit 12 and the signal generator 14 may be installed near the sound wave radiating unit 15 or at a position away from the sound wave radiating unit 15 such as a space inside the ship.

An example of installing the moth repellent device 10 on the ship 20 will be described with reference to FIG.
A total of four moth repellent devices 10 are installed on the ship 20, and the vibrating radiators 18a to 18d of the moth repellent devices 10 are arranged on both front and rear surfaces of the ship 20. The distance between the vibrating radiator 18a and the vibrating radiator 18c and the distance between the vibrating radiator 18b and the vibrating radiator 18d are 20 m, respectively. The distance between the vibrating radiator 18a and the vibrating radiator 18b and the distance between the vibrating radiator 18c and the vibrating radiator 18d are 60 m, respectively. The distance from the bow 22 of the ship 20 to the vibrating radiator 18a and the vibrating radiator 18c, or from the stern 24 to the vibrating radiator 18b and the vibrating radiator 18d is 30 m. The height of the oscillating radiator 18 from the deck of the ship 20 is 3 m. Further, the cargo 26 is arranged within 90 m from any one of the vibrating radiators 18a to 18d, and the sound wave from any one of the vibrating radiators 18a to 18d reaches the cargo 26. When the ship is equipped with a cargo compartment, it is preferable that the vibrating radiators 18a to 18d are arranged at positions where the sound waves reach the entrance of the passage leading to the cargo compartment.
The vibrating radiators 18a to 18d are fixed on the deck of the ship 20 via a vibrating radiator support (not shown) provided with four wire springs. From the vibrating radiators 18a to 18d, for example, the first burst signal having a burst signal width of 62 milliseconds and a burst signal period of 1 second, and a burst signal width of 162 milliseconds and a burst signal period of 1 A second burst signal of seconds and a sound wave transmitted by a burst waveform based on the second burst signal are repeatedly emitted.

4. Reaction of gypsy moth to sound waves 4-1. Reaction analysis based on the difference in the frequency of the burst waveforms that make up the burst signal Moths are known to recognize the ultrasonic waves emitted by their natural enemy, bats, and take escape actions. Therefore, the present inventors first investigated the relationship between the frequency of the burst waveform constituting the burst signal and the escape behavior of the gypsy moth in the escape behavior of moths.

Using the device shown in FIG. 5, sound waves transmitted in a predetermined burst waveform were radiated to female moths and male moths, respectively. The gypsy moth is fixed at a position of 30 to 50 cm from the speaker. A burst signal is created on a personal computer 32 (Visual Basic, DigiOnAudio2), and a speaker is created via a D / A converter 34 (DR-DAC2, manufactured by AUDIOTRAK) and an amplifier 36 (PMS-390AE, manufactured by DENON). A sound wave transmitted in a burst waveform was emitted from 30 (FT17H, manufactured by FOSTEX).

In the case of a female moth, the volume of the amplifier 36 is gradually increased during the flight action, and when an increase or decrease in the flapping frequency or amplitude of the female moth is observed, it is judged that a reaction has been observed, and the volume at that time is reacted. It was set as a threshold value.
In the case of male moths, stimulation by burst signals was performed in the same manner as in the case of female moths. On the other hand, regarding the reaction threshold, in order to reduce the influence of the difference in the flapping characteristics of the male moth and the female moth, it was judged that a reaction was observed by rotating so as to avoid the sound source direction, and the volume at that time was set. The reaction threshold was used.
If a reaction is observed, the volume of the amplifier 36 is maintained, and the volume is connected to the sound level meter 38 (STMS-864B: manufactured by Electronic Measurement Co., Ltd.) and the oscilloscope 40 (WH3219: manufactured by Brüel & Kjä). −L-006: Bruel & Kjä Co., Ltd.) measured and recorded. The measuring instrument was installed right next to the moth and measured perpendicular to the speaker 30. When measuring the volume with a sound level meter, the sound level meter can only measure up to 8 kHz, so the ultrasonic sound was measured with the same pattern for the sound whose frequency was changed to 4 kHz. Observation of moths was performed through monitor 44.

There are two types of burst waveform frequencies that make up the burst signal, 40 kHz (ultrasonic range) and 4 kHz (audible sound range), and the width of the burst signal is 2, 3, 5, 8, 10, 15, 20, for each frequency. The reaction thresholds of male and female moths were examined under nine conditions of 25 and 30 ms.

Regardless of the width of any burst signal, the reaction threshold value at the frequency of 40 kHz was lower than that at the frequency of 4 kHz, but the difference between the reaction threshold values was about 5 dB. Therefore, it was clarified that the difference in the frequency of the burst waveforms constituting the burst signal had almost no effect on the escape behavior of the gypsy moth.
In addition, in the repellent of moths, it is especially important to repel egg-laying female moths, but there was no difference between male and female moths in terms of escape behavior of gypsy moths.

4-2. Outdoor gypsy moth repellent behavior analysis A moth repellent device 10 was used for this analysis. The ultrasonic vibrators 18 and the vibrator 16 are manufactured by Taga Denki Co., Ltd., and the frequency of the burst waveform constituting the burst signal is set to 40 kHz.
Next, from the spherical vibrating radiator, the road surface was marked with a chalk in a straight line from 10 m to 100 m every 10 m, and the width of the burst signal was 62 for the male moth of Maimiga placed in the wire net cage at each location. A sound wave transmitted by a burst waveform based on a burst signal in which a burst signal having a millisecond and a burst signal period of 1 second and a burst signal having a burst signal width of 162 milliseconds and a burst signal period of 1 second are sequentially generated. Was emitted, and the reaction of Maimiga was visually observed. Five or more male moths within 5 days after emergence were placed in the wire mesh basket. While moving to the survey site, one side of the wire mesh cage was covered with a transparent acrylic plate, and the surface covered with the transparent acrylic plate was covered with a transparent acrylic plate so that the sound waves transmitted by the above burst waveform did not reach the male moth of the gypsy moth placed in the wire mesh cage. It moved so that it faced the vibrating radiator.

The reactivity was evaluated according to the following criteria.
−: No flapping is seen ±: I wonder if the sound waves transmitted in the burst waveform are flapping. Showed a reaction such as moving away

The burst signal was set by the condition setting unit 12 and radiated so as to be composed of the burst signal consisting of the following conditions (1) to (7). The duration of the following burst signal ON corresponds to the width of the burst signal. Due to the characteristics of the ultrasonic transducer used, it takes about 12 milliseconds from the rise to the maximum volume, so the width of each burst signal to be analyzed was set to be 12 milliseconds longer. The results are shown in FIG.
(1) [Burst signal ON: 62 msec, OFF: 938 msec, burst signal cycle 1 sec,
Duty ratio (burst signal ON duration per sec (sec) x 100 (%)) 6.2%]
(2) [Burst signal ON: 112 msec, OFF: 888 msec, burst signal cycle 1 sec,
Duty ratio 11.2%]
(3) [Burst signal ON: 162 msec, OFF: 838 msec, burst signal cycle 1 sec,
Duty ratio 16.2%]
(4) [Burst signal ON: 250 msec, OFF: 750 msec, burst signal cycle 1 sec,
Duty ratio 25.0%]
(5) [Burst signal ON: 112 msec, OFF: 1888 msec, burst signal cycle 2 sec,
Duty ratio 5.6%]
(6) [Burst signal ON: 250 msec, OFF: 1750 msec, burst signal cycle 2 sec,
Duty ratio 12.5%]
(7) Radiate (1) and (3) sequentially (alternately)

According to FIG. 6, the condition (1) shows a ++ reaction at a point 10 m to 30 m from the oscillating radiator, and the condition (2) shows a ++ or + reaction at a point 10 m to 70 m. Under the condition, a ++ or + reaction was shown at a point of 40 m to 90 m, and under the condition (4), a + reaction was shown at a point of 40 m to 90 m. Furthermore, under the condition (7), a ++ or + reaction was shown at points of 10 m and 30 to 90 m.
From this result, the condition (1) is used when repelling moths at a distance of less than 40 m, and (2), (3), (4) or (4) or (4) when repelling moths at a distance of 40 to 90 m. It was clarified that when the moths are repelled at a distance of 10 to 90 m under the condition (7), the moth repellent effect is high if the width of the burst signal is set so as to be the condition (7). .. On the other hand, regarding the period of the burst signal, it was clarified that there is a moth repellent effect in the range of 1 to 2 seconds.

4-3. Outdoor Moth Repellent Behavior Analysis The same moth repellent device 10 used in the above "Outdoor gypsy moth repellent behavior analysis" was installed, and the distance from the vibrating radiator and the moth repellent behavior were investigated. Moths were attracted by installing floodlights (mercury lamp parastress type, 135 / 300W, manufactured by Nikko Electronics Co., Ltd.) at locations 25m, 50m, 75m, and 100m away from the vibrating radiator. The floodlight was fixed to the legs of a tripod at a height of 0.9 m above the ground and facing upward (about 45 degrees). A white sheet with a width of 1.8 m and a length of 2.7 m is laid under the floodlight, and a white cloth with a width of about 1 m and a length of about 2 m is laid behind it. I stood up.

The number of moths attracted by the floodlight and flying was examined for the number of moths flying on the white cloth and white sheet. Since the number of individuals attracted varies depending on the location, the number of stink bugs and beetles that do not have ultrasonic receptors was also examined in order to correct the difference depending on the location.
Based on the results of the above "Analysis of repellent behavior of Maimiga outdoors", [burst signal width 62 ms, burst signal cycle 1 second], [burst signal width 62 ms, burst signal cycle 1 second], [burst] Signal width 165 ms, burst signal cycle 2 ms], [burst signal width 165 ms, burst signal cycle 1 second], [burst signal width 62 ms, burst signal cycle 1 second] The width and period of the burst signal were set and generated so as to form one cycle, and sound waves were emitted. The number of moths flying into the floodlight was measured 30 minutes after the start of the survey (radiation of sound waves and lighting of the floodlight) at points 25 m, 50 m, 75 m, and 100 m away from the vibrating radiator. Since the surrounding environment (topography, presence of trees, etc.) differs depending on the measurement point, the number of moths flying in differs. By expressing the number of flying moths as a relative value to the number of stink bugs that do not have a receptor for ultrasonic waves, the distance from the vibrating radiator and the number of flying moths were compared. The results are shown in FIG.

As is clear from FIG. 7, it is clear that the flying of moths is suppressed in a wide range of 25 m, 50 m, and 75 m, and that moths can be repelled by the moth repellent method according to the third invention based on the above conditions. rice field.

5. Moth Repellent Method An example of a method for repelling moths using the moth repellent device 10 used in the above-mentioned “Outdoor gypsy moth repellent behavior analysis” will be described.
First, in the condition setting unit 12, for example, the user sets the width of the burst signal to 62 milliseconds and the period of the burst signal to 1 second in the first condition, and sets the width of the burst signal to 162 in the second condition. Set the millisecond and burst signal period to 1 second.
Next, in the signal generator 14, the first burst signal and the second burst signal defined by the first condition and the second condition, respectively, are sequentially generated. By vibrating the vibrator 16 based on the first burst signal and the second burst signal generated by the signal generator 14, a sound wave transmitted in a burst waveform is generated. The generated sound wave is transmitted to the vibrating radiator 18 via the booster 17, and the generated sound wave is radiated from the vibrating radiator 18.
When repelling moths in a wide range such as on a ship, the vibrating radiators 18 of the moth repellent device 10 are installed at intervals of, for example, 10 to 90 m. By radiating sound waves transmitted by burst waveforms based on the first burst signal and the second burst signal, it is possible to suppress the arrival of moths over a wide range from 0 to 90 m starting from the vibrating radiator 18.

10 Moth repellent device 12 Condition setting unit 14 Signal generator 15 Sound wave radiating unit 16 Oscillator 17 Booster 18, 18a-18d Vibration radiator 19 Connection cable 20 Ship 22 Shiphead 24 Stern 26 Cargo 30 Speaker 32 Personal computer 34 D / A Converter 36 Amplifier 38 Sound level meter 40 Oscilloscope 42 Microphone 44 Monitor

Claims (5)

A gypsy moth repellent device for ships installed on ships.
A condition setting unit in which the width and period of the first burst signal are set as the first condition and the width and period of the second burst signal are set as the second condition.
A signal generator that sequentially generates the first burst signal and the second burst signal defined by the first condition and the second condition, respectively.
A sound wave emitting unit that emits a sound wave based on the first burst signal and the second burst signal generated by the signal generator is provided .
The width of the first burst signal is 55 milliseconds or more and 65 milliseconds or less, and the period of the first burst signal is 0.9 seconds or more and 2.1 seconds or less.
A marine gypsy moth repellent device having a width of the second burst signal of 155 milliseconds or more and 170 milliseconds or less and a period of the second burst signal of 0.9 seconds or more and 2.1 seconds or less. In the marine gypsy moth repellent device according to claim 1.
A marine gypsy moth repellent device in which the sound wave radiating portion is installed via an elastic body at a position where the sound wave reaches the entrance of a passage leading to the cargo or the cargo compartment. In the marine gypsy moth repellent device according to claim 2.
The sound wave radiating unit includes a vibration emitter of the vibrating body and a substantially spherical radiating sound waves in all directions, the diameter of the vibrating radiator is approximately twice the longitudinal length of the vibrating body vessels For radiant repellent device. The marine gypsy moth repellent device according to claim 1 is provided.
A ship in which the sound wave emitting portion is installed via an elastic body at a position where the sound wave reaches the entrance of a passage leading to the cargo or the cargo compartment. A method for repelling gypsy moth using the gypsy moth repellent device for ships according to claim 1.
A condition setting step in which the width and period of the first burst signal are set as the first condition and the width and period of the second burst signal are set as the second condition.
A signal generation step for sequentially generating the first burst signal and the second burst signal defined by the first condition and the second condition, respectively.
Look including a sound wave radiation step of radiating sound waves based on the first burst signal and second burst signal generated by said signal generating step,
The width of the first burst signal is 55 milliseconds or more and 65 milliseconds or less, and the period of the first burst signal is 0.9 seconds or more and 2.1 seconds or less.
A method for avoiding gypsy moth, wherein the width of the second burst signal is 155 milliseconds or more and 170 milliseconds or less, and the period of the second burst signal is 0.9 seconds or more and 2.1 seconds or less.

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