CN103969071B - The measuring method of acoustic filter sound deadening capacity and the pressure loss and measurement apparatus thereof - Google Patents
The measuring method of acoustic filter sound deadening capacity and the pressure loss and measurement apparatus thereof Download PDFInfo
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Abstract
本发明涉及一种消声器消声量和压力损失的测量方法及其测量装置，所述的测量方法包括以下步骤：1)信号发射模块向管道发出声信号；2)声压信号采集模块采集空管及安装消声器后受声室内的声压信号；3)气流速度测量模块测量上游管道内的气流速度信号；4)气流压力测量模块测量安装消声器后上游和下游管道内气流的静压和动压；5)信号处理模块接收声压、流速和气压信号，计算消声量、压力损失和流量，并将其传给显示模块、存储及报表生成模块；6)显示模块显示中间参量、消声量、压力损失以及流量；7)存储及报表生成模块存储测量数据、消声量、压力损失及流量计算结果，并生成测试报告。本发明具有精度高、速度快、数据处理一体化等优点。
The present invention relates to a kind of measuring method and its measuring device of muffler noise elimination amount and pressure loss, described measuring method comprises the following steps: 1) signal transmitting module sends sound signal to pipeline; 2) sound pressure signal collecting module collects empty pipe and The sound pressure signal in the acoustic chamber after the muffler is installed; 3) the airflow velocity measurement module measures the airflow velocity signal in the upstream pipeline; 4) the airflow pressure measurement module measures the static pressure and dynamic pressure of the airflow in the upstream and downstream pipelines after the muffler is installed; 5 ) The signal processing module receives the sound pressure, flow velocity and air pressure signals, calculates the noise reduction, pressure loss and flow, and sends it to the display module, storage and report generation module; 6) The display module displays the intermediate parameters, noise reduction, pressure loss and Flow rate; 7) The storage and report generation module stores measurement data, noise reduction, pressure loss and flow calculation results, and generates test reports. The invention has the advantages of high precision, high speed, integrated data processing and the like.
Description
技术领域 technical field
本发明涉及一种消声器测量技术，尤其是涉及一种消声器消声量和压力损失的测量方法及其测量装置。 The invention relates to a muffler measurement technology, in particular to a method for measuring muffler noise reduction and pressure loss and a measuring device thereof.
背景技术 Background technique
设备噪声是环境噪声的主要来源之一，严重干扰人们的工作和休息，危害人体健康。在通风和空调管路系统、风机、空压机、燃气机等设备进气端和排气端安装消声器是控制噪声传播的有效手段。消声器的消声量和压力损失是鉴定消声器质量、进行噪声控制工程设计的重要参数。目前还没有针对消声器的专业测量设备。传统测量方法需要测量声压级、气流静压和动压等中间数据，然后通过人工计算得到消声量、压力损失和气流流量，导致现场测量任务非常繁重，测量精度有限。 Equipment noise is one of the main sources of environmental noise, which seriously interferes with people's work and rest and endangers human health. Installing mufflers at the intake and exhaust ends of ventilation and air conditioning piping systems, fans, air compressors, gas engines and other equipment is an effective means of controlling noise transmission. The noise reduction and pressure loss of the muffler are important parameters to identify the quality of the muffler and carry out the engineering design of noise control. There is currently no professional measuring equipment for mufflers. Traditional measurement methods need to measure intermediate data such as sound pressure level, airflow static pressure, and dynamic pressure, and then manually calculate noise reduction, pressure loss, and airflow flow, resulting in very heavy on-site measurement tasks and limited measurement accuracy.
发明内容 Contents of the invention
本发明的目的就是为了克服上述现有测量技术存在的缺陷而提供一种测量过程直观、精度高、速度快、可实时生成测试报告的消声器消声量和压力损失测量方法及其测量装置。 The object of the present invention is to overcome the defects of the above-mentioned existing measurement technology and provide a method for measuring muffler noise reduction and pressure loss and its measuring device which is intuitive in the measurement process, high in precision, fast in speed, and capable of generating test reports in real time.
本发明的目的可以通过以下技术方案来实现： The purpose of the present invention can be achieved through the following technical solutions:
一种消声器消声量和压力损失的测量方法，其特征在于，包括以下步骤： A method for measuring sound reduction and pressure loss of a muffler, comprising the following steps:
1)信号发射模块通过依次连接的数字信号生成单元、数模转换卡、功率放大器和扬声器向管道内发出倍频带噪声或白噪声信号； 1) The signal transmitting module transmits octave band noise or white noise signals into the pipeline through the sequentially connected digital signal generating unit, digital-to-analog conversion card, power amplifier and loudspeaker;
2)声压信号采集模块通过依次连接的传声器、前置放大器、模数转换卡和数字信号接收单元分别采集空管和安装消声器两个工况下受声室内的声压信号，并将其传给信号处理模块； 2) The sound pressure signal acquisition module respectively collects the sound pressure signals in the sound receiving room under the two working conditions of the empty pipe and the muffler installed through the sequentially connected microphone, preamplifier, analog-to-digital conversion card and digital signal receiving unit, and transmits them to to the signal processing module;
3)气流速度测量模块：通过依次连接的气流速度计、模数转换卡测量上游管道内的气流速度，并将其传给信号处理模块； 3) Airflow velocity measurement module: measure the airflow velocity in the upstream pipeline through the sequentially connected airflow velocity meter and analog-to-digital conversion card, and transmit it to the signal processing module;
4)气流压力测量模块：通过依次连接的气压计和模数转换卡测量安装消声器后上游和下游管道内气流的静压和动压，并将其传给信号处理模块； 4) Airflow pressure measurement module: measure the static pressure and dynamic pressure of the airflow in the upstream and downstream pipelines after the muffler is installed through the sequentially connected barometer and analog-to-digital conversion card, and transmit it to the signal processing module;
5)信号处理模块根据空管和安装消声器两个工况下受声室内的声压信号计算消声器倍频带消声量和A计权消声量，根据上游和下游管道内气流的静压和动压计算压力损失，根据上游管道内气流流速和管道截面面积计算流量，并将其传给显示模块、存储及报表生成模块； 5) The signal processing module calculates the muffler octave band noise reduction and A-weighted noise reduction based on the sound pressure signals in the sound receiving room under the two working conditions of empty pipe and installed muffler, and calculates according to the static pressure and dynamic pressure of the airflow in the upstream and downstream pipelines Pressure loss, calculate the flow rate according to the air flow velocity in the upstream pipeline and the cross-sectional area of the pipeline, and send it to the display module, storage and report generation module;
6)显示模块显示中间参量、消声量、压力损失及流量； 6) The display module displays intermediate parameters, noise reduction, pressure loss and flow;
7)存储及报表生成模块存储测量数据、消声量、压力损失及流量计算结果，并生成测试报告。 7) The storage and report generation module stores measurement data, noise reduction, pressure loss and flow calculation results, and generates test reports.
所述的信号发射模块的工作参数包括声信号发射通道、信号幅值、发射信号时长、噪声信号类型、各频带信号幅值加权值。 The working parameters of the signal transmitting module include acoustic signal transmitting channel, signal amplitude, transmitting signal duration, noise signal type, and weighted value of signal amplitude in each frequency band.
所述的噪声信号类型包括：倍频带噪声信号和白噪声信号。 The noise signal types include: octave band noise signal and white noise signal.
所述的声压信号采集模块的工作参数包括信号采集通道、信号采样频率、刷屏周期和信号平均时长。 The working parameters of the sound pressure signal acquisition module include signal acquisition channel, signal sampling frequency, refresh cycle and signal average duration.
所述的气流速度测量模块的工作参数包括信号采集通道、信号采样频率和信号平均时长。 The working parameters of the airflow velocity measurement module include signal acquisition channels, signal sampling frequency and signal average duration.
所述的气流压力测量模块的工作参数包括信号采集通道、信号采样频率和信号平均时长。 The working parameters of the airflow pressure measurement module include signal acquisition channels, signal sampling frequency and signal average duration.
所述的消声器的倍频带消声量和A计权消声量、压力损失以及流量计算具体步骤为： The specific steps for calculating the octave band noise reduction and A-weighted noise reduction, pressure loss and flow rate of the muffler are:
1)设置信号发射模块和声压信号采集模块的工作参数，向管道内发射倍频带噪声或白噪声，分别测量空管和安装消声器两个工况下受声室内的倍频带声压级和A计权声级； 1) Set the working parameters of the signal transmitting module and the sound pressure signal acquisition module, emit octave band noise or white noise into the pipeline, and measure the octave band sound pressure level and A weighted sound level;
2)设置气流速度测量模块的工作参数，测量上游管道内的气流速度； 2) Set the working parameters of the air velocity measurement module to measure the air velocity in the upstream pipeline;
3)设置气流压力测量模块的工作参数，测量安装消声器后上游和下游管道内气流的动压和静压； 3) Set the working parameters of the airflow pressure measurement module to measure the dynamic pressure and static pressure of the airflow in the upstream and downstream pipelines after the muffler is installed;
4)信号处理模块利用空管和安装消声器两个工况下受声室内的倍频带声压级和A计权声级计算消声器的倍频带消声量和A计权消声量；根据上游和下游管道内气流的静压和动压计算消声器的压力损失；根据上游管道内的气流速度和管道截面面积计算流量。 4) The signal processing module uses the octave band sound pressure level and A-weighted sound level in the sound receiving chamber under the two working conditions of empty pipe and installed muffler to calculate the octave band noise reduction and A-weighted noise reduction of the muffler; according to the upstream and downstream pipelines Calculate the pressure loss of the muffler based on the static pressure and dynamic pressure of the internal airflow; calculate the flow rate based on the airflow velocity in the upstream pipe and the cross-sectional area of the pipe.
一种消声器消声量和压力损失的测量方法的测量装置，其特征在于，包括信号发射模块、管道、声压信号采集模块、气流速度测量模块、气流压力测量模块、信号处理模块、显示模块、存储及报表生成模块；所述的信号处理模块分别与声压信号采集模块、气流速度测量模块、气流压力测量模块、显示模块、存储及报表生成模块连接，负责声压和气流信号的实时处理、存储和测试报告生成。 A measuring device for the measurement method of noise reduction and pressure loss of a muffler, characterized in that it includes a signal transmitting module, a pipeline, a sound pressure signal acquisition module, an airflow velocity measurement module, an airflow pressure measurement module, a signal processing module, a display module, a storage and a report generating module; the signal processing module is respectively connected with the sound pressure signal acquisition module, the air velocity measurement module, the air pressure measurement module, the display module, the storage and the report generation module, and is responsible for the real-time processing and storage of the sound pressure and air flow signals and test report generation.
所述的信号发射模块通过依次连接的数字信号生成单元、数模转换卡、功率放大器和扬声器向管道发出倍频带噪声或白噪声信号；所述的数字信号生成单元通过LabVIEW编程产生倍频带噪声或白噪声信号，由数模转换卡将数字信号转换成模拟信号，通过功率放大器放大后馈入扬声器。 The signal transmitting module sends octave band noise or white noise signal to the pipeline through the digital signal generating unit, digital-to-analog conversion card, power amplifier and loudspeaker connected in sequence; the digital signal generating unit generates octave band noise or white noise through LabVIEW programming. The white noise signal is converted from a digital signal to an analog signal by a digital-to-analog conversion card, amplified by a power amplifier, and then fed to the speaker.
所述的管道包括声源至消声器或替代管之间的上游管道，以及消声器或替代管至受声室之间的下游管道。 The pipelines include the upstream pipeline between the sound source and the muffler or the substitute pipe, and the downstream pipeline between the muffler or the substitute pipe and the sound receiving room.
所述的声压信号采集模块通过依次连接的传声器、前置放大器、模数转换卡和数字信号接收单元分别采集空管和安装消声器两个工况下受声室内的声压信号，并将其传给信号处理模块。 The sound pressure signal acquisition module respectively collects the sound pressure signals in the sound receiving room under the two working conditions of the empty pipe and the installation of the muffler through the sequentially connected microphone, preamplifier, analog-to-digital conversion card and digital signal receiving unit, and converts them into to the signal processing module.
所述的气流速度测量模块通过依次连接的气流速度计和模数转换卡，测量上游管道内的气流速度信号，并将其传给信号处理模块。 The airflow velocity measurement module measures the airflow velocity signal in the upstream pipeline through the sequentially connected airflow velocity meter and analog-to-digital conversion card, and transmits it to the signal processing module.
所述的气流压力测量模块通过依次连接的气流压力计和模数转换卡，测量安装消声器后上游和下游管道内的气流静压和动压，并将其传给信号处理单元。 The airflow pressure measurement module measures the static pressure and dynamic pressure of the airflow in the upstream and downstream pipelines after the muffler is installed through the airflow pressure gauge and the analog-to-digital conversion card connected in sequence, and transmits it to the signal processing unit.
所述的信号处理模块根据空管和安装消声器两个工况下受声室内的声压信号计算消声器的倍频带消声量和A计权消声量，根据安装消声器后上游和下游管道内气流的静压和动压计算压力损失，根据上游管道内的气流速度和管道截面面积计算流量，并将其传给显示模块、存储及报表生成模块。 The signal processing module calculates the octave-band noise reduction and A-weighted noise reduction of the muffler according to the sound pressure signals in the sound receiving chamber under the two working conditions of the empty pipe and the installation of the muffler, and according to the static pressure of the airflow in the upstream and downstream pipelines after the muffler is installed Calculate the pressure loss based on the pressure and dynamic pressure, calculate the flow rate according to the airflow velocity in the upstream pipeline and the cross-sectional area of the pipeline, and send it to the display module, storage and report generation module.
所述的消声器的倍频带消声量和A计权消声量、压力损失以及流量计算具体步骤为： The specific steps for calculating the octave band noise reduction and A-weighted noise reduction, pressure loss and flow rate of the muffler are:
1)设置信号发射模块和声压信号采集模块的工作参数，向管道内发射倍频带噪声或白噪声，测量空管情况下受声室内的各倍频带声压级记为Lp0，A计权声级记为Lp0A，测量安装消声器情况下受声室内的各倍频带声压级记为Lp1，A计权声级记为Lp1A，单位均为dB； 1) Set the working parameters of the signal transmitting module and the sound pressure signal acquisition module, emit octave band noise or white noise into the pipeline, and measure the sound pressure level of each octave band in the sound receiving room under the condition of empty pipe, and record it as L p0 , weighted by A The sound level is recorded as L p0A , the sound pressure level of each octave band in the sound receiving room is recorded as L p1 when the muffler is installed, and the A-weighted sound level is recorded as L p1A , and the unit is dB;
2)设置气流速度测量模块的工作参数，测量上游管道内的气流速度记为vu，单位为m/s； 2) Set the working parameters of the air velocity measurement module, measure the air velocity in the upstream pipeline as vu, and the unit is m/s;
3)设置气流压力测量模块的工作参数，测量安装消声器后上游管道内气流的动压记为pvu，静压记为psu，下游管道内气流的动压记为pvd，和静压记为psd，单位均为Pa； 3) Set the working parameters of the airflow pressure measurement module, measure the dynamic pressure of the airflow in the upstream pipeline after installing the muffler as p vu , the static pressure as p su , the dynamic pressure of the airflow in the downstream pipeline as p vd , and the static pressure is p sd , the unit is Pa;
4)信号处理模块利用空管和安装消声器两个工况下受声室内的倍频带声压级和A计权声级计算消声器的各倍频带消声量记为D，单位为dB： 4) The signal processing module uses the octave-band sound pressure level and the A-weighted sound level in the sound-receiving chamber under the two working conditions of the empty pipe and the muffler to calculate.
D＝Lp0—Lp1； D=L p0- L p1 ;
A计权消声量记为DA，单位为dBA： The A-weighted sound attenuation is denoted as D A , and the unit is dBA:
DA＝Lp0A—Lp1A； D A = L p0A - L p1A ;
根据上游和下游管道内气流的静压和动压计算消声器的压力损失记为Δp，单位为Pa： Calculate the pressure loss of the muffler according to the static pressure and dynamic pressure of the airflow in the upstream and downstream pipelines and record it as Δp in Pa:
Δp＝(pvu+psu)—(pvd+psd)； Δp=(p vu +p su )—(p vd +p sd );
当消声器两端管道截面面积相同时，压力损失可由下式计算： When the cross-sectional area of the pipes at both ends of the muffler is the same, the pressure loss can be calculated by the following formula:
Δp＝psu—psd； Δp=p su —p sd ;
根据上游管道内的气流速度vu和管道截面面积S计算流量记为U，单位为m3/s： Calculate the flow rate according to the airflow velocity v u in the upstream pipeline and the cross-sectional area S of the pipeline, which is denoted as U, and the unit is m 3 /s:
U＝vu*S。 U= vu *S.
所述的显示模块包括声压时域信号显示单元、声压级显示单元、消声量显示单元、压力损失显示单元、流量显示单元； The display module includes a sound pressure time-domain signal display unit, a sound pressure level display unit, a noise reduction display unit, a pressure loss display unit, and a flow display unit;
其中，所述的声压时域信号显示单元实时显示受声室内的声压时域信号曲线，所述的声压级显示单元显示倍频带声压级曲线及其列表、A计权声级，所述的消声量显示单元显示以63Hz、125Hz、250Hz、500Hz、1000Hz、2000Hz、4000Hz、8000Hz为中心频率的倍频带消声量列表和A计权消声量，所述的压力损失显示单元显示消声器的压力损失，所述的流量显示单元显示上游管道内的气流流量。 Wherein, the sound pressure time domain signal display unit displays the sound pressure time domain signal curve in the sound receiving room in real time, and the sound pressure level display unit displays the octave band sound pressure level curve and its list, A-weighted sound level, The noise reduction display unit displays the octave band noise reduction list and the A-weighted noise reduction with 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, and 8000Hz as the center frequency, and the pressure loss display unit displays the muffler Pressure loss, the flow display unit displays the air flow in the upstream pipeline.
所述的存储及报表生成模块包括声压级存储单元、消声量存储单元、压力损失存储单元、流量存储单元、测试信息编辑单元、测试报告生成单元、测试报告存储单元、测试报告打印单元。 The storage and report generation module includes a sound pressure level storage unit, a noise reduction storage unit, a pressure loss storage unit, a flow storage unit, a test information editing unit, a test report generation unit, a test report storage unit, and a test report printing unit.
其中，所述的声压级存储单元存储空管和安装消声器后两个工况下受声室内的倍频带声压级和A计权声级，所述的消声量存储单元存储以63Hz、125Hz、250Hz、500Hz、1000Hz、2000Hz、4000Hz、8000Hz为中心频率的倍频带消声量和A计权消声量，所述的压力损失存储单元存储消声器的压力损失，所述的流量存储单元存储上游管道的气流速度和流量，所述的测试信息编辑单元编辑测试信息，所述的测试报告生成单元生成测试报告，所述的测试报告存储单元存储测试报告，所述的测试报告打印单元打印测试报告。 Wherein, the sound pressure level storage unit stores the octave band sound pressure level and A-weighted sound level in the sound receiving room under the two working conditions of the empty pipe and the installation of the muffler, and the noise reduction storage unit stores the noise at 63Hz, 125Hz , 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000Hz are the octave band noise reduction and A-weighted noise reduction of the center frequency, the pressure loss storage unit stores the pressure loss of the muffler, and the flow storage unit stores the upstream pipeline Air velocity and flow, the test information editing unit edits test information, the test report generating unit generates test reports, the test report storage unit stores test reports, and the test report printing unit prints test reports.
与现有技术相比，本发明具有测量过程自动化，数据采集可视化，可实时生成测试报告，可用于消声器消声量和压力损失的实时测量。 Compared with the prior art, the invention has the advantages of automatic measurement process, visualized data collection, real-time generation of test reports, and real-time measurement of muffler noise reduction and pressure loss.
附图说明 Description of drawings
图1为本发明的结构示意图。 Fig. 1 is a structural schematic diagram of the present invention.
具体实施方式 detailed description
下面结合附图和具体实施例对本发明进行详细说明。 The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
实施例 Example
如图1所示，本发明通过测量通风管道插入消声器前后位于半消声室内距离管口中心1m远45度方向处噪声倍频带声压级和A计权声级，得到消声器各倍频带消声量和A计权消声量，通过在上游管道布置的气流速度计测量管道内的气流速度，通过在上游和下游管道内布置的气压计测量消声器的压力损失。所述的测量方法包括信号发射模块11、声压信号采集模块12、气流速度测量模块13、气流压力测量模块14、信号处理模块15、显示模块16和存储及报表生成模块17，所述的信号处理模块15分别与声压信号采集模块12、气流速度测量模块13、气流压力测量模块14、显示模块16、存储及报表生成模块17连接。 As shown in Figure 1, the present invention is located in the semi-anechoic chamber before and after the insertion of the muffler by measuring the noise octave band sound pressure level and the A-weighted sound level at a direction of 45 degrees away from the center of the nozzle in the semi-anechoic chamber, and obtains the muffler noise reduction in each octave band of the muffler and A-weighted sound attenuation, the air velocity in the pipeline is measured by the air velocity meter arranged in the upstream pipeline, and the pressure loss of the muffler is measured by the barometers arranged in the upstream and downstream pipelines. Described measurement method comprises signal transmission module 11, sound pressure signal acquisition module 12, airflow speed measurement module 13, airflow pressure measurement module 14, signal processing module 15, display module 16 and storage and report generation module 17, described signal The processing module 15 is respectively connected with the sound pressure signal acquisition module 12 , the airflow speed measurement module 13 , the airflow pressure measurement module 14 , the display module 16 , and the storage and report generation module 17 .
所述的信号发射模块11通过数字信号生成单元、数模转换卡、功率放大器和扬声器协同工作，向管道内发出倍频带噪声或白噪声，所述的声压信号采集模块12通过依次连接的传声器、前置放大器、模数转换卡和数字信号接收单元分别采集空管和安装消声器两个工况下受声室内的声压信号，将其传给信号处理模块15，所述的气流速度测量模块13通过依次连接的气流速度计和模数转换卡，测量上游管道中的气流速度信号，并将其传给信号处理模块15，所述的气流压力测量模块14通过依次连接的气流压力计和模数转换卡测量安装消声器后上游和下游管道内的气流的静压和动压，并将其传给信号处理模块15，所述的信号处理模块15根据空管和安装消声器两个工况下受声室内的声压信号计算消声器的倍频带消声量和A计权消声量，根据安装消声器后上游和下游管道内气流的静压和动压计算压力损失，根据上游管道内的气流速度和管道截面面积计算流量，并将其传给显示模块16、存储及报表生成模块17； The signal transmitting module 11 sends octave band noise or white noise into the pipeline through the digital signal generating unit, digital-to-analog conversion card, power amplifier and loudspeaker, and the sound pressure signal acquisition module 12 passes through the sequentially connected microphones. , preamplifier, analog-to-digital conversion card and digital signal receiving unit respectively collect the sound pressure signal in the acoustic chamber under the two working conditions of the empty pipe and the installation of the muffler, and pass it to the signal processing module 15, and the air velocity measurement module 13. Measure the airflow velocity signal in the upstream pipeline through the airflow velocity meter and the analog-to-digital conversion card connected in sequence, and send it to the signal processing module 15. The digital conversion card measures the static pressure and dynamic pressure of the airflow in the upstream and downstream pipelines after the muffler is installed, and transmits it to the signal processing module 15. Calculate the octave band noise reduction and A-weighted noise reduction of the muffler from the sound pressure signal in the acoustic chamber, calculate the pressure loss based on the static pressure and dynamic pressure of the airflow in the upstream and downstream pipelines after installing the muffler, and calculate the pressure loss according to the airflow velocity in the upstream pipeline and the cross section of the pipeline Calculate flow by area, and pass it to display module 16, storage and report generation module 17;
以下举例说明本发明的测量过程： The following examples illustrate the measurement process of the present invention:
对消声器ZP100(外形尺寸1200mm×700mm×600mm，法兰尺寸500mm×400mm有效长度1000mm，内插一片，厚度100mm)，分别测量空管和加入ZP100消声器在气流速度分别为0m/s(静态)、3m/s、6m/s、9m/s条件下的倍频带声压级和A计权声级，每次测量均按以下步骤执行： For the muffler ZP100 (dimensions 1200mm×700mm×600mm, flange size 500mm×400mm, effective length 1000mm, one piece inserted, thickness 100mm), measure the airflow velocity of the empty pipe and the ZP100 muffler when the air velocity is 0m/s (static), respectively. For the octave band sound pressure level and A-weighted sound level under the conditions of 3m/s, 6m/s, and 9m/s, each measurement is performed according to the following steps:
1)声信号发射模块的参数设置：设定信号采样频率为44100Hz、信号幅值为1、信号时长为60s，信号选择白噪声信号。通过在不同的倍频带(中心频率分别为63Hz、125Hz、250Hz、500Hz、1000Hz、2000Hz、4000Hz、8000Hz)下面输入信号幅值加权值，使扬声器各频带的频率响应基本一致，根据仪器连接情况选择输出信号通道。 1) Parameter setting of the acoustic signal transmitting module: set the signal sampling frequency to 44100Hz, the signal amplitude to 1, the signal duration to 60s, and the signal to choose white noise signal. By inputting signal amplitude weighting values under different octave bands (center frequencies are 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000Hz), the frequency response of each frequency band of the speaker is basically the same, and the selection is made according to the connection of the instrument output signal channel.
2)声压采集模块的参数设置：选择传声器标定或实时测量。传声器标定时输入标定频率1000Hz。选择实时测量时，根据仪器连接情况选择输入信号通道，输入采集信号采样频率44100、采集信号平均时长30s、刷屏周期1s，停止方式包括设定“运行时长”或“手动停止”； 2) Parameter setting of the sound pressure acquisition module: select microphone calibration or real-time measurement. When the microphone is calibrated, input the calibration frequency 1000Hz. When selecting real-time measurement, select the input signal channel according to the connection of the instrument. The sampling frequency of the input acquisition signal is 44100, the average duration of the acquisition signal is 30s, and the screen refresh cycle is 1s. The stop method includes setting "running time" or "manual stop";
3)实时测量：显示模块实时显示所采集的受声室内声压信号的时域图、中心频率分别为63Hz、125Hz、250Hz、500Hz、1000Hz、2000Hz、4000Hz、8000Hz的倍频带声压级曲线及其列表，A声级，数据每隔1s更新一次。显示模块还显示上游管道内的气流速度和流量、消声器的压力损失。 3) Real-time measurement: the display module displays in real time the time-domain diagram of the collected sound pressure signal in the receiving room, the octave band sound pressure level curves with center frequencies of 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000Hz and Its list, A sound level, data is updated every 1s. The display module also shows the air velocity and flow in the upstream pipe, the pressure loss of the muffler.
4)数据的处理和存储：测试设备运行结束，显示模块会显示消声器的消声量、压力损失、气流速度和流量等测量值，存储及报表生成模块会存储测量结果，并生成测试报告。测量结果如表1所示： 4) Data processing and storage: After the test equipment is running, the display module will display the measured values of the muffler's noise reduction, pressure loss, air velocity and flow rate, etc. The storage and report generation module will store the measurement results and generate a test report. The measurement results are shown in Table 1:
表1气流速度及消声器消声量测量结果 Table 1 Air velocity and muffler noise reduction measurement results
表2：气流流量、气流速度及消声器压力损失测量结果 Table 2: Measurement results of air flow, air velocity and pressure loss of muffler
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