High-frequency capability improving system for reverberation room sound test

Abstract

The invention provides a high-frequency capability improving system for a reverberation room sound test. The high-frequency capability improving system comprises a power supply time sequence manager, a digital audio processor, a power amplifier, a current and voltage monitoring protection device and a plurality of groups of loudspeaker arrays, the power supply time sequence manager is used for uniformly managing the power-on sequence and the power-off sequence of the digital audio processor, the power amplifier, the current and voltage monitoring protection device and each group of loudspeaker array; the digital audio processor is used for performing signal control on the power amplifier, the current and voltage monitoring protection device and each group of loudspeaker array in the test process; the power amplifiers are used for driving the corresponding loudspeaker arrays, the current and voltage monitoring protection devices are used for monitoring the current and voltage of the corresponding loudspeaker arrays, the loudspeaker arrays are used for generating sound radiation through diaphragm vibration, and the sound radiation is used for carrying out high-frequency sound production testing on a to-be-tested product. Cost is low, maintenance is easy, test preparation time is short, and personnel safety is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of spacecraft acoustic testing, and in particular to a high-frequency capability enhancement system for a reverberation chamber acoustic test. Background Art

[0002] With the development of my country's large-scale launch vehicles, the requirements for the high-frequency sound generation capability of the reverberation chamber are getting higher and higher, and high-frequency airflow sound generators are needed to generate high-frequency sound excitations in the reverberation chamber. In the large-scale spacecraft tests in recent years, the number of high-frequency sound generators equipped with the reverberation chambers for existing spacecraft noise tests cannot meet the requirements of the sound pressure spectrum of new launch vehicles, resulting in insufficient testing in the high-frequency band of the new spacecraft sound test, which affects the assessment of the spacecraft's ability to tolerate the acoustic environment. At present, there are no mature domestic products for high-frequency airflow sound generators used in noise tests, and they mainly rely on imports.

[0003] However, the high-frequency airflow sound generators currently used in reverberation chambers have high requirements for establishing the working state of the equipment and the operators, and are difficult to repair after a failure occurs, resulting in low efficiency of reverberation chamber sound tests. Summary of the invention

[0004] The invention provides a high frequency capability improvement system for a reverberation chamber acoustic test, which is used to solve the defects of high cost, high requirements and low test efficiency of the acoustic test in the prior art.

[0005] In a first aspect, the present invention provides a high-frequency capability enhancement system for a reverberation chamber acoustic test, comprising: a power timing manager, a digital audio processor, a power amplifier, a current and voltage monitoring protection device, and a plurality of speaker arrays;

[0006] The power timing manager is used to uniformly manage the power-on sequence and power-off sequence of the digital audio processor, the power amplifier, the current and voltage monitoring protection device, and each group of the speaker array;

[0007] The digital audio processor is used to perform signal control on the power amplifier, the current and voltage monitoring protection device and each group of the speaker array during the test;

[0008] The power amplifier is used to drive the corresponding speaker array, the current and voltage monitoring protection device is used to monitor the current and voltage of the corresponding speaker array, and the multiple groups of speaker arrays are used to generate sound radiation using diaphragm vibration, and the sound radiation is used to perform high-frequency sound testing on the product to be tested.

[0009] According to a high-frequency capability enhancement system for a reverberation chamber acoustic test provided by the present invention, a plurality of groups of speaker arrays are arranged in the reverberation chamber, and the speaker arrays are evenly distributed around the product to be tested.

[0010] According to a high-frequency capability enhancement system for a reverberation chamber acoustic test provided by the present invention, each of the power amplifiers drives two groups of speaker arrays, and the power amplifiers are arranged outside the reverberation chamber.

[0011] According to a high-frequency capability enhancement system for a reverberation chamber acoustic test provided by the present invention, the speaker arrays are four groups, the power amplifiers are two, and the current and voltage monitoring protection devices are four;

[0012] The four groups of speaker arrays are respectively arranged at the four corners of the reverberation chamber.

[0013] According to a high-frequency capability enhancement system for a reverberation chamber acoustic test provided by the present invention, the number of the speaker array is set according to the requirements of the product to be tested.

[0014] According to a high-frequency capability enhancement system for a reverberation chamber acoustic test provided by the present invention, each of the speaker arrays includes three speakers connected in parallel, the sound frequency band of each speaker is an octave band of 2k-8k, and the total sound pressure level of a single speaker in continuous working state is 127dB.

[0015] According to a high-frequency capability enhancement system for a reverberation chamber acoustic test provided by the present invention, the current monitoring range of the current and voltage monitoring protection device is 0-100A, and the voltage monitoring range is 0-200V.

[0016] According to a high-frequency capability enhancement system for a reverberation chamber acoustic test provided by the present invention, the cabinet material of the speaker array is wood, and the diaphragm material of the speaker array is titanium diaphragm.

[0017] A high-frequency capability enhancement system for a reverberation chamber acoustic test provided by the present invention also includes a power amplifier cable;

[0018] The power amplifier cable is used to connect the speaker array and the power timing manager.

[0019] According to a high-frequency capability enhancement system for a reverberation chamber acoustic test provided by the present invention, the power timing manager, the digital audio processor and the power amplifier are integrally fixedly installed in a movable cabinet via an aviation cabinet rack.

[0020] The present invention provides a high-frequency capability improvement system for a reverberation chamber acoustic test, comprising: a power timing manager, a digital audio processor, a power amplifier, a current and voltage monitoring protection device, and a plurality of groups of speaker arrays; the power timing manager is used for uniformly managing the power-on sequence and the power-off sequence of the digital audio processor, the power amplifier, the current and voltage monitoring protection device, and each group of speaker arrays; the digital audio processor is used for performing signal control on the power amplifier, the current and voltage monitoring protection device, and each group of speaker arrays during the test; the power amplifier is used for driving the corresponding speaker array, the current and voltage monitoring protection device is used for monitoring the current and voltage of the corresponding speaker array, the plurality of speaker arrays are used for generating acoustic radiation by utilizing diaphragm vibration, the acoustic radiation is used for performing high-frequency sound testing on a product to be tested, and the sound generation principle of acoustic radiation generated by diaphragm vibration is utilized by means of a speaker array to improve the high-frequency sound generation capability of the reverberation chamber. Compared with a high-frequency airflow sound generator, the system has low cost, is easy to maintain, has a short test preparation time, is beneficial to personnel safety, and effectively improves the efficiency of the reverberation chamber acoustic test. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 Schematic diagram of the principle of the high-frequency capability enhancement system for the reverberation chamber acoustic test provided in this embodiment; DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Figure 1 1 is a schematic diagram of the principle of the high-frequency capability enhancement system for the reverberation chamber acoustic test provided in this embodiment.

[0025] like Figure 1As shown, a high-frequency capability enhancement system for a reverberation chamber acoustic test provided by an embodiment of the present invention includes: a power timing manager 1, a digital audio processor 2, a power amplifier 3, a current and voltage monitoring protection device 4, and multiple groups of speaker arrays 5; the power timing manager 1 is used to uniformly manage the power-on sequence and power-off sequence of the digital audio processor 2, the power amplifier 3, the current and voltage monitoring protection device 4, and each group of speaker arrays 5; the digital audio processor 2 is used to perform signal control on the power amplifier 3, the current and voltage monitoring protection device 4, and each group of speaker arrays 5 during the test; the power amplifier 3 is used to drive the corresponding speaker array 5, the current and voltage monitoring protection device 4 is used to monitor the current and voltage of the corresponding speaker array 5, and the multiple groups of speaker arrays 5 are used to generate sound radiation using diaphragm vibration, and the sound radiation is used to perform high-frequency sound emission tests on the products to be tested.

[0026] In a specific implementation process, multiple groups of speaker arrays 5 are evenly arranged around the product to be tested in the reverberation chamber. For example, four groups of speaker arrays 5 can be set, each group of speaker arrays 5 is set with three speakers connected in parallel, and the electric speaker arrays 5 are arranged at the four corners of the reverberation chamber respectively. The cables are passed through the trench and connected to the power timing manager 1 at the same time. The power amplifier 3 is set outside the reverberation chamber, wherein each power amplifier 3 drives two speaker arrays 5. When there are four groups of speaker arrays 5, two power amplifiers 3 are correspondingly set. The number of current and voltage monitoring protection devices 4 corresponds to the number of speaker arrays 5, so four current and voltage monitoring protection devices 4 are set to monitor and protect the speaker arrays 5 respectively. The digital audio processor 2 is connected to the power timing manager 1, and the speaker array 5 is connected to the power amplifier 3. The digital audio processor 2 adopts a multi-input and multi-output (4 inputs and 8 outputs) multi-channel processor to perform signal control during the test.

[0027] After all the components are built, the acoustic test can be started. The power supply of all devices is managed uniformly through the power sequence manager 1. The devices are turned on one by one from low power to high power, and turned off one by one from high power to low power in order, so as to reduce the impact current of the power transmission line when the equipment is powered on, which may cause damage to the equipment. Then after powering on, the test can be started. During the test, the digital audio processor 2 performs frequency filtering, EQ adjustment, signal gain, compression limiting, configuration storage and other functions on the signal. At the same time, each two speaker arrays 5 can realize real-time monitoring of current and voltage through two current and voltage monitoring protection devices 4 respectively, ensuring that the speaker array 5 is not damaged by overcurrent or overvoltage. The current monitoring and limiting range is 0-100A, and the voltage monitoring and limiting range is 0-200V, which meets the requirements of the test setting of limiting current 8A and limiting voltage 80V. Each group of speaker arrays 5 in the speaker array 5 is composed of three speakers in parallel, and the sound frequency band of each speaker is an octave band of 2k-8k. The total sound pressure level of a single speaker in the continuous working state is 127dB.

[0028] During the test, the speaker array 5 is used to utilize the principle of sound radiation generated by diaphragm vibration to improve the sound power radiated by the speaker, thereby achieving the purpose of improving the high-frequency sound characteristics of the reverberation chamber sound test. In addition, in order to improve the reliability of the electric speaker, a passive speaker is used as a preferred solution. The speaker only includes three parts: a diaphragm group, a magnetic circuit group, and an acoustic lens. The speaker amplifier is set outside the reverberation chamber to ensure that the speaker amplifier circuit is not affected by the strong noise in the reverberation chamber, thereby avoiding the strong noise environment in the reverberation chamber, which may easily cause damage to the circuit and electronic components such as solder joint failure and loosening of the shell connection screws.

[0029] Furthermore, in this embodiment, the power sequence manager 1, the digital audio processor 2 and the power amplifier 3 can be integrally fixedly installed in a movable cabinet through an aviation cabinet rack. This facilitates maintenance and management, and the entire cabinet can be moved. In addition, the cables of the supporting speaker array 5 use sheathed low-resistance cables, and the signal cables use shielded cables, which have long transmission distances and strong anti-interference capabilities.

[0030] Furthermore, the cabinet material of the speaker array 5 in this embodiment is 25mm wood, such as birch plywood, and the internal structure of the cabinet is reinforced and spliced ​​by slotted and butted plates. The surface treatment of the cabinet is a polyurea spraying process, which is strong and wear-resistant. The connecting screws are first drilled with guide holes, then the screws are positioned, and anti-loosening treatments such as gluing are performed. The diaphragm material of the speaker array 5 is titanium diaphragm, which effectively avoids damage under the strong noise of the reverberation chamber. After multiple reverberation chamber noise tests, it has been verified that the titanium diaphragm can withstand a high sound intensity noise environment of 146dB. By selecting the materials for the speaker cabinet and diaphragm, the damage to the speaker caused by strong noise is also reduced, effectively improving the efficiency of the sound test.

[0031] Through the design of electric speakers, anti-loosening measures and other anti-noise design methods, the reliability of electric speakers in strong noise environments is effectively improved, thereby ensuring the reliability of the acoustic test system based on electric speakers.

[0032] Furthermore, the present embodiment also includes an amplifier cable, which is used to connect the speaker array 5 and the power sequence manager 1. The amplifier cable is a sheathed low-resistance high-density copper core cable, with a cable length of 5m-100m, and the specific length is designed according to the on-site requirements of the reverberation room. The cable resistance is not higher than 4Ω, preferably 1Ω, which can reduce the power loss of long-distance cables.

[0033] Further, based on the above embodiment, the number of speaker arrays 5 in this embodiment is set according to the requirements of the product to be tested. The number and arrangement positions of the speaker arrays 5 are set according to the high-frequency sound requirements of the product to be tested to ensure that the acoustic test can be carried out efficiently.

[0034] Specifically, it includes measuring the dimensions of the space, accurately measuring the length, width and height of the space required to place the product to be tested, that is, the dimensions of the reverberation chamber. Determine the speaker specifications, obtain the technical specifications and performance characteristics of the speaker, including power, frequency response range, sensitivity and impedance, etc. Determine the coverage of the speaker, that is, the area where the speaker can effectively transmit sound, which is usually determined by the radiation angle of the speaker.

[0035] By formula (1), determine the number of speaker arrays;

[0036] N=(S / C)×K (1)

[0037] Where: N is the number of speakers required, S is the total area of ​​the reverberation room, C is the effective coverage area of ​​a single speaker array, C is determined based on the radiation angle and distance of the speaker, and K is a safety factor or adjustment factor.

[0038] Among them, K is used to consider the influence of factors such as space shape, obstacles, sound absorption and reflection on sound propagation. The value of K is adjusted according to the actual situation and can be determined through experiments or experience.

[0039] Since the effective coverage area is related to the test requirements of the product to be tested, the greater the required noise, the larger the effective coverage area is required. The effective coverage areas of different speaker arrays are superimposed to form the total effective coverage area. Therefore, by increasing the number of speakers, the noise of the product to be tested can be effectively increased to meet the requirements. Therefore, the number of required speaker arrays can be effectively determined by formula (1).

[0040] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0041] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high frequency capability enhancement system for reverberation chamber acoustic testing, characterized in that: include: Power sequencers, digital audio processors, power amplifiers, current and voltage monitoring protection devices, and multiple speaker arrays; The power timing manager is used to uniformly manage the power-on sequence and power-off sequence of the digital audio processor, the power amplifier, the current and voltage monitoring protection device, and each group of the speaker array; The digital audio processor is used to perform signal control on the power amplifier, the current and voltage monitoring protection device and each group of the speaker array during the test; The power amplifier is used to drive the corresponding speaker array, the current and voltage monitoring protection device is used to monitor the current and voltage of the corresponding speaker array, and the multiple groups of speaker arrays are used to generate sound radiation using diaphragm vibration, and the sound radiation is used to perform high-frequency sound testing on the product to be tested.

2. The high frequency capability enhancement system for reverberation chamber acoustic testing according to claim 1, characterized in that: A plurality of groups of the speaker arrays are arranged in the reverberation chamber, and the speaker arrays are evenly distributed around the product to be tested.

3. The high frequency capability enhancement system for reverberation chamber acoustic testing according to claim 2, characterized in that: Each of the power amplifiers drives two groups of speaker arrays, and the power amplifiers are arranged outside the reverberation chamber.

4. The high frequency capability enhancement system for reverberation chamber acoustic testing according to claim 3 is characterized in that: The number of the speaker arrays is four, the number of the power amplifiers is two, and the number of the current and voltage monitoring and protection devices is four; The four groups of speaker arrays are respectively arranged at the four corners of the reverberation chamber.

5. The high frequency capability enhancement system for reverberation chamber acoustic testing according to claim 1, characterized in that: The number of the speaker arrays is set according to the requirements of the product to be tested.

6. The high frequency capability enhancement system for reverberation chamber acoustic testing according to claim 1, characterized in that: Each of the speaker arrays includes three speakers connected in parallel, the sound frequency band of each speaker is an octave band of 2k-8k, and the total sound pressure level of a single speaker in a continuous working state is 127dB.

7. The high frequency capability enhancement system for reverberation chamber acoustic testing according to claim 1, characterized in that: The current monitoring range of the current and voltage monitoring protection device is 0-100A, and the voltage monitoring range is 0-200V.

8. The high frequency capability enhancement system for reverberation chamber acoustic testing according to claim 1, characterized in that: The box material of the loudspeaker array is wood, and the diaphragm material of the loudspeaker array is titanium diaphragm.

9. The high frequency capability enhancement system for reverberation chamber acoustic testing according to claim 1, characterized in that: Also included are amplifier cables; The power amplifier cable is used to connect the speaker array and the power timing manager.

10. The high frequency capability enhancement system for reverberation chamber acoustic testing according to any one of claims 1 to 9, characterized in that: The power timing manager, the digital audio processor and the power amplifier are integrally fixedly installed in a movable cabinet via an aviation cabinet rack.

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