A method for generating an underwater broadband environmental sound source applied to arctic ice regions

Abstract

A method for generating an underwater broadband environmentally friendly sound source for use in Arctic ice regions, relating to the field of underwater acoustic engineering technology. The method involves selecting a vacuum bulb, ensuring consistency in bulb size and vacuum level; calculating the bulb placement depth based on empirical formulas relating placement depth, sound source level, and resonant frequency; designing a bulb sound source release device, including a winch, bulb holder, bulb, and drop hammer; the winch includes a stainless steel drum, steel wire, foot pedal, and manual tensioning device; the bulb holder comprises a fixed plate, a movable plate, a support column, and a striking column sleeve; the striking column sleeve is fixed to the stainless steel fixed plate. The movable plate has a central hole for holding the vacuum bulb; the drop hammer is a hollow cylindrical structure. The bulb holder, winch, and steel wire are integrated into a single structure. The bulb sound source release device can shatter vacuum bulbs at depths exceeding 50 meters. It requires no power supply, has a simple structure, is easy to place, has a large effective depth, and produces a good sound source effect, making it suitable for acoustic research and experiments in Arctic ice regions.

Description

Technical Field

[0001] This invention relates to the field of underwater acoustic engineering technology, and in particular to a method for generating an underwater broadband environmentally friendly sound source applicable to the Arctic ice region. Background Technology

[0002] The Arctic region has a vast ocean area, and with climate warming and seasonal sea ice retreat, the Arctic is becoming increasingly important for shipping routes, resource development, military activities, and scientific research. Because the Arctic and its adjacent waters are located at high latitudes and experience consistently low temperatures, the Arctic seas have a unique sound velocity profile, making the Arctic underwater acoustic environment distinct from the shallow and deep seas of other non-polar regions.

[0003] Underwater sound sources are crucial equipment in marine acoustics research. Currently, commonly used sound sources in underwater acoustic experiments include transmitting transducers (arrays), explosion sources, air guns or pneumatic sources, plasma, and light bulbs. Transmitting transducers are typically single-frequency or narrow-frequency, while the others are broadband sources. Light bulb sources produce broadband, short-pulse sound signals, which are less harmful to the marine environment than other high-power sources, making them a broadband, environmentally friendly, and safe sound source. In the past, environmental awareness was relatively weak, and explosion sources, due to their large source level and small variation, were more favored in applications.

[0004] In 1963, Urick (Urick R J. Implosions as Sources of Underwater Sound[J].The Journal of the Acoustical Society of America,1963,35(11):2026-2027) used glass bottles as implosion sound sources and believed that although their conversion efficiency was low, they were still useful. Marshall et al. of the Woods Hole Oceanographic Institution (Marshall Orr, Michael Schoenberg. Acoustic signatures from deepwater implosions of spherical cavities[J].The Journal of the Acoustical Society of America,1976,59(5):1155-1159) analyzed the acoustic signals generated by the implosion of hollow glass spheres, and gave the pressure characteristics, energy density spectrum and total acoustic energy in the 96-5000Hz frequency band when the placement depth was 3km. They also pointed out that the glass sphere sound source may be used in the study of seabed sedimentary structures. Heard et al. (Heard GJ, McDonald M, Chapman NR, et al. Underwater light bulb implosions: a useful acoustic source [C] / / OCEANS'97.MTS / IEEE Conference Proceedings.IEEE, 1997) conducted underwater sound source experiments using ordinary light bulbs as sound sources, providing guidance on sound source level, sound spectrum, and the use of ordinary-sized light bulbs and fluorescent tubes. They concluded that implosion bulbs may be the most cost-effective sound source at depths below 300 meters in shallow water operations, minimizing environmental impact. Ghiotto et al. (Ghiotto A, Penrose JD. Investigating The Acoustic Properties Of The Underwater Implosions Of LightGlobes And Evacuated Spheres. 2009) from Curtin University, Australia, used household lightweight spheres and specially made vacuum spheres to implode at depths of 1–40 m, providing the pressure-time series and spectrum of the implosion.In the study of acoustic reflection coefficients at the lower interface of Arctic ice by TCYang (Yang,TC), and in the Arctic trans-ice positioning study and shallow sea acoustic inversion experiment by SEDosso, the bulb sound source was used as an important sound source.

[0005] In China, Shao Zhihui et al. from the Institute of Acoustics, Chinese Academy of Sciences (Shao Zhihui, Xiao Ling, Li Zhenglin et al. Performance Analysis of Vacuum Implosion Bulb Sound Source [C] / / Young Academic Conference of the Acoustical Society of China. 2003) discussed the correlation between the vacuum level of the bulb and the sound source level by using a modified equation, estimated the pulsation time of the bulb sound source under different vacuum conditions, explored the performance of the bulb sound source, and studied the relationship between the performance of the vacuum implosion bulb sound source and the vacuum level. The research group led by Academician Zhang Renhe of the Institute of Acoustics, Chinese Academy of Sciences (Shao Zhihui, Xiao Ling, Li Zhenglin et al. Performance Analysis of Vacuum Implosion Bulb Sound Source [C] / / Young Academic Conference of the Acoustical Society of China. 2003) designed and used a bulb sound source device to obtain a high sound source level signal, and used the bulb sound source to calibrate the shape of the receiving array in the International Marine Acoustics Joint Experiment in the Asian Seas. Du Zhipeng et al. (Du Zhipeng, Du Jianye, Li Ying et al. Theoretical Model Study on Implosion of Spherical Container in Incompressible Fluid [C] / / 2015:5) proposed that underwater crushing of a container can cause implosion, generating an implosion shock wave that damages the surrounding structure. Based on the principle of energy conservation, they derived a theoretical model for implosion of a spherical container in incompressible fluid. The implosion shock wave pressure, bubble radius, and bubble collapse time period can be predicted based on parameters such as the radius of the spherical container and the hydrostatic pressure acting on it.

[0006] With the increasing number of domestic Arctic acoustic research and experiments, the demand for generating broadband and environmentally friendly sound sources in ice-covered waters is becoming increasingly strong. As mentioned earlier, the bulb sound source is a very practical broadband and environmentally friendly sound source. In the past, the application of bulb sound sources was mainly to deploy them from the hull of a ship. Without power support, the deployment depth was relatively shallow (not exceeding 10m); for deployment at greater depths (more than 50m), a power-powered bulb sound source release device was required, supported by the power supply of the work vessel. In the Arctic experimental ice area, the ambient temperature is low, the requirements for power supply equipment are high, and the distance from the work vessel makes it difficult to obtain effective power. Conventional bulb sound source release devices cannot break implosion bulbs at depths of more than 50 meters without power, and there are also problems such as difficulty in operation in ice-covered areas. Therefore, to achieve deep deployment and obtain a broadband and environmentally friendly sound source in the Arctic ice area, there is an urgent need to develop an underwater bulb sound source and its release device that does not require power support and is easy to operate. Summary of the Invention

[0007] The purpose of this invention is to provide a method for generating an underwater broadband environmentally friendly sound source applicable to the Arctic ice region. Addressing the lack of underwater broadband environmentally friendly sound sources in the Arctic ice region, this invention utilizes an underwater implosion vacuum bulb and its release device, thereby generating a broadband environmentally friendly sound source in the Arctic ice region without the need for a power source.

[0008] The method for generating an underwater broadband environmentally friendly sound source applicable to the Arctic ice region includes the following steps:

[0009] 1) Vacuum bulb selection: Since the performance of the bulb sound source is related to the thickness, size and vacuum level of the bulb glass, in order to ensure the stability of the acoustic performance of the bulb sound source, it is necessary to first unify the brand of the bulb. If it is a custom bulb, the same glass material must be used, and the size and vacuum level of the bulb must be consistent.

[0010] 2) Design the placement depth of the bulb sound source: The placement depth of the bulb sound source is closely related to the sound source level and resonant frequency of the bulb sound source. In acoustic research and experiments in the Arctic ice region, there are different specific requirements for the bulb sound source. Based on the actual requirements, the placement depth of the bulb sound source is calculated and reasonably designed according to the empirical formula of the relationship between placement depth and sound source level and resonant frequency.

[0011] 3) Design of the bulb sound source release device: The bulb sound source release device consists of three main parts: a winch, a bulb holder and a bulb, and a drop hammer. The winch is composed of an I-shaped stainless steel drum, a steel wire, a foot pedal, and a manual tensioning device. The steel wire is longer than 50m. A manual tensioning device is installed on the stainless steel drum for easy manual operation. The foot pedal is a stainless steel counterweight foot pedal to prevent the winch from slipping in icy areas. The bulb holder includes two upper and lower stainless steel fixed plates, three stainless steel support columns, two movable plates, a striker sleeve, and a vacuum bulb. The stainless steel fixed plates have several perforated structures to facilitate communication and water flow. The striker sleeve is fixed to the upper stainless steel fixed plate and consists of an outer tube and an inner tube. The outer tube of the impact column sleeve is fixed to the upper stainless steel fixing plate, and the inner tube of the impact column sleeve is elastically connected to the upper stainless steel fixing plate by a spring. The lower end has a pointed structure. The movable plate is fixed to the stainless steel support columns on both sides with bolts, and can move up and down. There is a round hole in the middle. A vacuum bulb is placed between the two movable plates. The drop hammer is a stainless steel hollow cylindrical structure with two bolts built into the middle. The bolts can control its opening and closing. There is a rope-tying component above the drop hammer to facilitate the attachment of an auxiliary rope and control the drop hammer's deployment. The bulb frame, winch drum, and steel wire are an integrated structure. The drop hammer and vacuum bulb can be freely disassembled.

[0012] 4) Releasing the bulb sound source: After determining the deployment depth, place the bulb holder at the required depth. Use the auxiliary rope to pull the drop hammer to a position 10m above the required depth. Release the auxiliary rope so that the drop hammer falls along the steel wire onto the inner tube of the impact column sleeve above the bulb holder. After being stressed, the inner tube moves downward, and the lower tip will hit the vacuum bulb, causing an implosion and releasing sound energy, thereby generating a broadband sound signal.

[0013] In step 1), the vacuum degree of the vacuum bulb is 30 kPa.

[0014] In step 2), the empirical formula relating the placement depth, sound source level, and resonant frequency, based on actual needs, is as follows:

[0015] Based on the empirical relationship between deployment depth and sound source level:

[0016] SL=160+26*log(h)+ξ (1)

[0017] Where SL is the sound source level, h is the depth of the bulb underwater, and ξ is the change that varies with the bulb radius, vacuum level, and glass material.

[0018] If the sound source level is to reach 180dB, the initial calculation shows that the depth h needs to be greater than 6m; in addition, based on the empirical relationship between deployment depth and resonant frequency:

[0019] f = k * (g * (h + 10)) 5 / 6 (2)

[0020] Where f is the resonant frequency, g is the gravitational acceleration, and k is a coefficient that varies with the bulb radius, vacuum level, and glass material; if the resonant frequency is 200Hz, the depth h can be preliminarily calculated to be approximately 50m.

[0021] In step 3), the length of the steel wire is designed to be 200-250m; the stainless steel counterweight of the foot pedal is 4-10 catties; and the stainless steel fixing plate has 2-4 perforated structures.

[0022] This invention designs an integrated winch, drop hammer, and bulb holder to shatter vacuum bulbs at depths exceeding 50 meters underwater, releasing and generating a broadband, environmentally friendly sound source in the Arctic ice region. The device designed using this method requires no power supply and features a simple structure, easy deployment, large operating depth, and excellent sound source effect, making it suitable for acoustic research and experiments in the Arctic ice region.

[0023] Compared with existing technologies such as explosion sound sources and shipborne light bulb sound sources, the present invention has the following advantages:

[0024] 1. The light bulb is an implosion sound source. The sound source has a wide frequency band but a small overall sound source level, so its impact on marine life can be ignored.

[0025] 2. Light bulbs are customized according to their size, glass material, and vacuum level to ensure a stable sound source level and a unified standard.

[0026] 3. The bulb release device does not require a power supply and can operate at a depth of over 50m;

[0027] 4. The bulb sound source and its release device are simple to operate and maintain, and are suitable for the Arctic ice region. Attached Figure Description

[0028] Figure 1 The relationship between the resonant frequency, sound level, and depth of light bulbs with different radii. Where a represents the relationship between the resonant frequency and depth of light bulbs with different radii; b represents the relationship between the sound level and depth of light bulbs with different radii.

[0029] Figure 2 A schematic diagram of the overall structure of the light bulb sound source release device.

[0030] Figure 3 Detailed composition and structure of the light bulb sound source release device.

[0031] Figure 4 Detailed structure of the drop hammer and stainless steel fixing plate.

[0032] Figure 5 The time-domain diagram of the sound source signal generated by this method.

[0033] Figure 6 The frequency domain diagram of the sound source signal generated by this method. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the following embodiments will be used in conjunction with the accompanying drawings to further illustrate the invention. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Rather, the invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of the invention as defined by the claims. Furthermore, to provide the public with a better understanding of the invention, some specific details are described in detail below. Those skilled in the art will fully understand the invention even without these detailed descriptions.

[0035] To realize an underwater vacuum bulb sound source and its release device for applications in the Arctic ice region, embodiments of the present invention provide the following technical solution: customization of the vacuum bulb, design of the bulb sound source placement depth, and design of the bulb sound source release device. The specific steps are as follows:

[0036] 1. Light bulb selection. Since the performance of the light bulb sound source is related to the thickness and size of the bulb glass, in order to ensure the stability of the sound source level, it is necessary to first unify the brand of the light bulbs. If the light bulbs are custom-made, they must be made of the same glass material and be classified according to the size of the light bulbs to ensure that the size of the light bulbs is consistent. According to the size of the light bulb holder designed in this embodiment, the diameter of the light bulbs should not exceed 30cm.

[0037] 2. Vacuum Extraction. Since the performance of the bulb's sound source is closely related to the bulb's vacuum level, after sorting the bulbs, a vacuum extractor is needed to extract the vacuum from the bulbs. This ensures that the bulb's sound source has a certain vacuum level, and the atmospheric pressure inside the bulbs is uniformly 30 kPa after vacuum extraction.

[0038] 3. Determine the deployment depth. Based on requirements and the empirical relationship between deployment depth and sound source level:

[0039] SL=160+26*log(h)+ξ (1)

[0040] Where SL is the sound source level, h is the depth of the bulb underwater, and ξ is the variation caused by differences in bulb radius, vacuum level, and glass material. If the sound source level is to reach 180dB, a preliminary calculation suggests that the depth h should be greater than 6m. Furthermore, based on the empirical relationship between deployment depth and resonant frequency:

[0041] f = k * (g * (h + 10)) 5 / 6 (2)

[0042] Where f is the resonant frequency, g is the gravitational acceleration, and k is a coefficient that varies with the bulb radius, vacuum level, and glass material. If a resonant frequency of 200Hz is desired, the depth h can be initially calculated to be approximately 50m.

[0043] Therefore, the placement depth can be flexibly adjusted based on the requirements for the sound source level and resonant frequency during the Arctic experiment. Of course, if there are direct requirements for the placement depth of the sound source, all three factors must be considered together.

[0044] 4. The release of sound from the light bulb.

[0045] First, after determining the deployment depth, step on the winch foot pedal, rotate the drum, and turn the steel wire to lower the bulb holder through the pre-drilled ice hole into the sub-ice water. Once deployed to the desired depth, lower the winch handbrake to position it. Next, tighten the two parts of the drop hammer with bolts, ensuring the steel wire is positioned within the hollow part of the drop hammer. Use the auxiliary rope to pull the drop hammer to a point 10 meters above the desired depth. Finally, release the auxiliary rope, allowing the drop hammer to fall along the steel wire rope onto the inner tube of the impact sleeve above the bulb holder. The inner tube, under pressure, moves downwards, and its pointed lower end strikes the vacuum bulb, causing an implosion and releasing acoustic energy, thus generating a broadband sound signal.

[0046] 5. Calibration of the bulb sound source. If detailed data on the bulb sound source level and energy distribution within the frequency band are required, the bulb sound source needs to be calibrated. The calibration method is the same as that for general explosion sound source calibration. For details, please refer to the literature (Xiao Yongbing, Chen Hongzhi. Measurement and analysis of explosion sound source level in marine underwater acoustic survey [J]. Marine Technology, 2009, 28(2):58-6) and the literature (Liu Qingyu, Ma Shuqing, Yang Hua. Data analysis method of explosion sound source level [J]. Acoustics and Electronic Engineering, 2014, 116(4):1-4). The formula for calculating the sound source level is as follows:

[0047] SL(f0)=10lg[E(f0)]-Mv-m+20lgr (3)

[0048] In the formula, f0 is the center frequency, E(f0) is the energy within the bandwidth with f0 as the center frequency, the bandwidth is selected according to the processing needs, Mv is the sensitivity of the hydrophone, m is the amplification of the receiving system, and r is the distance between the receiving hydrophone and the bulb sound source.

[0049] This invention obtains an underwater broadband environmentally friendly sound source by breaking an implosion vacuum bulb at a set depth underwater and releasing sound energy.

[0050] Figures 1-6 An example of generating a broadband environmentally friendly sound source in the Arctic ice region using the method of this invention is given. Specific embodiments are described with reference to the figures.

[0051] Figure 1 This graph shows the relationship between the resonant frequency and sound level of the sound source and the depth of the underwater vacuum bulb for bulbs of the same model and vacuum level with radii d of 0.4 mm, 0.5 mm, and 0.6 mm, respectively. This graph allows for the selection of the bulb radius and placement depth as needed. Figure a shows the relationship between the resonant frequency and depth of the sound source for bulbs of different radii, and figure b shows the relationship between the sound level and depth of bulbs of different radii.

[0052] Figure 2 A schematic diagram of the overall structure of the light bulb sound source release device; Figure 3 A detailed schematic diagram of the composition and structure of the light bulb sound source release device; Figure 4 Detailed structure of the drop hammer and stainless steel fixing plate; Figure 5 This is a time-domain diagram of the sound source signal generated by this method; Figure 6 This is the frequency domain diagram of the sound source signal generated by this method.

[0053] The device is an integrated structure consisting of a winch, a bulb holder, a drop hammer, and a vacuum bulb. Specifically, it includes a winch 1, a bulb holder 2, a drop hammer 3, a vacuum bulb 4, a roller 11, a steel wire 12, a foot pedal 13, a manual tensioning device 14, an auxiliary rope 15, a fixed plate 21, a support column 22, a movable plate 23, a striking column sleeve 24, an inner tube 241 of the striking column sleeve, an outer tube 242 of the striking column sleeve, a drop hammer 31, and a drop hammer 32.

[0054] The winch consists of an I-shaped stainless steel drum 11, a steel wire 12, a foot pedal 13, a manual tensioning device 14, and an auxiliary rope 15.

[0055] The fixing plate 21 consists of two parts, upper and lower, made of stainless steel, and can be provided with 2 to 4 perforated structures to facilitate communication and water flow. The upper stainless steel fixing plate has a through hole in the center. The outer tube 242 of the striking column sleeve 24 passes through the through hole in the center of the upper stainless steel fixing plate and is fixedly connected to the upper stainless steel fixing plate. The inner tube 241 of the striking column sleeve is elastically connected to the upper stainless steel fixing plate by a spring. The lower end of the inner tube 241 of the striking column sleeve has a pointed structure.

[0056] The movable plate 23 consists of two pieces, each with a large circular hole in the center for placing the vacuum bulb 4. The movable plate 23 can move up and down to adjust its position and is fixed to the side support column 22 with bolts. The upper and lower stainless steel fixing plates 21 are welded and fixed to both ends of the support column 22. The upper and lower stainless steel fixing plates 21 and the two movable plates 23 are connected by three stainless steel support columns 22 to form an important structure for the bulb holder.

[0057] The winch and the bulb holder are connected by a steel wire 12.

[0058] The drop hammer is a hollow cylindrical structure made of stainless steel. A bolt is built into the center of drop hammer 3, allowing it to be freely opened and closed, separating into two parts: drop hammer 31 and drop hammer 32. A rope-tying component is located above the drop hammer. The light bulb can also be freely removed by adjusting the bolts on the support column. The stainless steel fixing plate can be perforated. Figure 4 There are 4 holes in the middle.

[0059] In use, the sound source signal generated using this method is received by a hydrophone, and the time-domain and frequency-domain graphs of the sound source signal are obtained as follows. Figure 5 and 6 As shown. From Figure 5 It can be seen that the generated signal is a pulse broadband signal; from Figure 6 It can be seen that the source level of the generated signal at some frequencies within 1kHz is close to 180dB. In fact, due to the high sensitivity of the receiving hydrophone during the experiment, there was a limiting effect. If this is taken into account, the source level of the generated signal at most frequencies within 1kHz exceeds 180dB.

[0060] The above embodiments are merely preferred embodiments of the present invention and should not be considered as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A method for generating an underwater broadband environmentally friendly sound source for use in Arctic ice regions, characterized in that... Includes the following steps: 1) Vacuum bulbs: Since the performance of the bulb sound source is related to the thickness, size and vacuum level of the bulb glass, in order to ensure the stability of the acoustic performance of the bulb sound source, it is necessary to first unify the brand of the bulb. If it is a custom bulb, the same glass material must be used, and the size and vacuum level of the bulb must be consistent. 2) Design the placement depth of the bulb sound source: The placement depth of the bulb sound source is closely related to the sound source level and resonant frequency of the bulb sound source. In acoustic research and experiments in the Arctic ice region, there are different specific requirements for the bulb sound source. Based on the actual requirements, the placement depth of the bulb sound source is calculated and reasonably designed according to the empirical formula of the relationship between placement depth and sound source level and resonant frequency. 3) Design of the bulb sound source release device: The bulb sound source release device consists of three main parts: a winch, a bulb holder and bulb, and a drop hammer. The winch comprises an I-shaped stainless steel drum, a steel wire, a foot pedal, and a manual tensioning device. The steel wire is longer than 50m, with one end connected to the winch drum and the other end connected to the bulb holder. The foot pedal includes a stainless steel counterweight to prevent the winch from slipping in icy areas and facilitates stepping. A manual tensioning device is installed on the stainless steel drum for manual control. The bulb holder includes two upper and lower stainless steel fixed plates, three stainless steel support columns, two movable plates, and a drop hammer sleeve. The stainless steel fixed plates have several perforated structures to facilitate communication and water flow. The drop hammer... The sleeve is fixed to the upper stainless steel fixed plate and consists of an outer tube and an inner tube; the outer tube of the hammer sleeve is fixed to the upper stainless steel fixed plate, and the inner tube of the hammer sleeve is elastically connected to the upper stainless steel fixed plate by a spring, with a pointed structure at the lower end; the movable plate is fixed to the stainless steel support columns on both sides with bolts, and can move up and down, with a round hole in the middle; a vacuum bulb is placed between the two movable plates; the drop hammer is a hollow stainless steel cylindrical structure, divided into two parts in the middle, with two bolts inside, which can control its opening and closing; there is a rope-tying component above the drop hammer, which makes it easy to tie an auxiliary rope; one end of the auxiliary rope is tied to the drop hammer, and the other end of the auxiliary rope is suspended in the air or tied to the winch fixed part for later use; the bulb frame and the winch are an integrated structure, and the drop hammer and bulb can be freely disassembled; 4) Releasing the bulb sound source: After determining the deployment depth, place the bulb holder at the required depth. Use the auxiliary rope to pull the drop hammer to a position 10m above the required depth. Release the auxiliary rope so that the drop hammer falls along the steel wire onto the inner tube of the impact column sleeve above the bulb holder. After being stressed, the inner tube moves downward, and the lower tip will hit the vacuum bulb, causing an implosion and releasing sound energy, thereby generating a broadband sound signal.

2. The method for generating an underwater broadband environmentally friendly sound source applicable to the Arctic ice region as described in claim 1, characterized in that... In step 1), the vacuum degree of the vacuum bulb is 30 kPa.

3. The method for generating an underwater broadband environmentally friendly sound source applicable to the Arctic ice region as described in claim 1, characterized in that... In step 2), the empirical formula relating the placement depth, sound source level, and resonant frequency, based on actual needs, is as follows: Based on the empirical relationship between deployment depth and sound source level: SL=160+26*log(h)+ξ (1) Where SL is the sound source level, h is the depth of the bulb underwater, and ξ is the change that varies with the bulb radius, vacuum level, and glass material; it can be preliminarily calculated that the depth h must be greater than 6m for the sound source level to reach 180dB. In addition, based on the empirical relationship between deployment depth and resonant frequency: f=k*(g*(h+10)) 5 / 6 (2) Where f is the resonant frequency, g is the gravitational acceleration, and k is a coefficient that varies with the bulb radius, vacuum level, and glass material; it can be calculated that when the resonant frequency is 200Hz, the depth h is approximately 50m.

4. The method for generating an underwater broadband environmentally friendly sound source applicable to the Arctic ice region as described in claim 1, characterized in that... In step 3), the length of the steel wire is designed to be 200-250m.

5. The method for generating an underwater broadband environmentally friendly sound source applicable to the Arctic ice region as described in claim 1, characterized in that... In step 3), the foot pedal contains a stainless steel counterweight of 4 to 10 kilograms.

6. The method for generating an underwater broadband environmentally friendly sound source applicable to the Arctic ice region as described in claim 1, characterized in that... In step 3), the stainless steel fixing plate has 2 to 4 perforated structures.

7. The method for generating an underwater broadband environmentally friendly sound source applicable to the Arctic ice region as described in claim 1, characterized in that... In step 4), the specific steps for releasing the light bulb sound source are as follows: After determining the deployment depth, the foot-operated winch is used to rotate the drum and the steel wire to lower the light bulb frame into the ice water through the pre-drilled ice hole. After it is deployed to the required depth, the winch is manually tightened and stopped from rotating by the manual tensioning device. The two parts of the drop hammer are bolted together so that the steel wire is located in the hollow part of the drop hammer. The drop hammer is pulled to a position 10m above the required depth using an auxiliary rope. The auxiliary rope is released so that the drop hammer falls along the steel wire rope and hits the inner tube of the impact column sleeve above the light bulb frame. After the inner tube is subjected to force, it moves downward, and its lower tip will hit the vacuum light bulb, causing an implosion and releasing sound energy, thereby generating a broadband sound signal.

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