CN113008364B - Armored vehicle covert noise measurement method and device - Google Patents
Armored vehicle covert noise measurement method and device Download PDFInfo
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- CN113008364B CN113008364B CN202110364344.0A CN202110364344A CN113008364B CN 113008364 B CN113008364 B CN 113008364B CN 202110364344 A CN202110364344 A CN 202110364344A CN 113008364 B CN113008364 B CN 113008364B
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Abstract
The application discloses a method and a device for measuring hidden noise of an armored vehicle, and belongs to the field of automobiles. The armored vehicle covert noise measuring method comprises the following steps: acquiring first sound information acquired at a first measuring point and second sound information acquired at a second measuring point at the same moment; the distance between the first measuring point and the armored car to be measured is smaller than that between the first measuring point and the armored car to be measured; judging whether the background noise meets a preset test condition when the first sound information is obtained through measurement according to the first sound information and the second sound information; and if the background noise meets the preset test condition when the first sound information is obtained through measurement, determining the auditory sensorless distance aiming at the noise of the armored car to be tested according to the first sound information. The method and the device can ensure that the background noise meets the test requirement in the process of measuring the hidden noise of the armored vehicle.
Description
Technical Field
The application belongs to the technical field of automobiles, and particularly relates to a method and a device for measuring hidden noise of an armored vehicle.
Background
The running noise of the armored vehicle is one of factors influencing the concealment performance of the armored vehicle, and when the concealed noise of the armored vehicle is tested, the environmental noise (namely background noise) in a test field can be generally ensured to meet the test requirement, but the environmental noise from the outside of the test field is difficult to be ensured to meet the test requirement all the time in the test process.
Disclosure of Invention
The embodiment of the application aims to provide a method and a device for measuring the hidden noise of an armored vehicle, which can solve the problem that the environmental noise from the outside of a test field is difficult to ensure to meet the test requirement all the time in the process of measuring the hidden noise of the armored vehicle.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, the embodiment of the application provides a method for measuring concealed noise of an armored vehicle, which comprises the following steps:
acquiring first sound information acquired at a first measuring point and second sound information acquired at a second measuring point at the same time; the distance between the first measuring point and the armored car to be measured is smaller than that between the first measuring point and the armored car to be measured;
judging whether the background noise obtained by measuring the first sound information meets a preset test condition or not according to the first sound information and the second sound information;
and if the background noise meets the preset test condition when the first sound information is obtained through measurement, determining the auditory sensorless distance aiming at the noise of the armored car to be tested according to the first sound information.
Optionally, the first sound information includes sound information of multiple octave bands;
the determining an auditory imperceptible distance for the armored car noise under test from the first sound information includes:
calculating a first auditory unperceivable distance at a center frequency of each of the octave bands, respectively;
determining the largest one of the first auditory imperceptible distances as the auditory imperceptible distance.
Optionally, the calculating the first auditory unperceived distance at the center frequency of each octave band respectively includes:
calculating the first auditory imperceptible distance r according to the following formula2：
Wherein L is1Is the sound pressure level, L, in the sound information of the first octave band2Is the sound pressure level, L, of the first octave band sound at the first location2Is a sound pressure level higher in a quiet environment and in an average hearing ability of the human ear for the first octave band sound, the distance r between the first location and the armored car under test2，r1Is the distance between the first measuring point and the armored car to be measured, AeA noise attenuation coefficient for the first octave band sound; the first octave band is any one of the plurality of octave bands.
Optionally, a free field microphone is used when the sound pressure level in the first sound information is collected at the first measurement point, the sound level meter selects "F" time for weighting, and sets an equivalent continuous sound level or a maximum value holding level according to test requirements, and the integration time is not less than 8 s.
Optionally, the number of the first measurement points is multiple, the number of the second measurement points is the same as that of the first measurement points, each second measurement point is located on an extension line of a connecting line between a center point of the measurement area and the first measurement point, and the armored vehicle to be measured is parked at the center position in the measurement area in a stationary manner, or the armored vehicle to be measured runs in the measurement area at a constant speed, or the armored vehicle to be measured runs in the measurement area at an accelerated manner.
In a second aspect, the present application provides a concealed noise measuring device for an armored vehicle, including:
the sound information acquisition module is used for acquiring first sound information acquired at a first measuring point and second sound information acquired at a second measuring point at the same moment; wherein the distance between the first measuring point and the armored car to be measured is smaller than the second measuring point;
the judging module is used for judging whether the background noise meets a preset test condition when the first sound information is obtained through measurement according to the first sound information and the second sound information;
and the determining module is used for determining the auditory sensorless distance aiming at the noise of the armored car to be tested according to the first sound information if the background noise obtained by measuring the first sound information meets the preset test condition.
Optionally, the first sound information includes sound information of multiple octave bands;
the determining module includes:
a calculating unit for calculating first auditory unperceived distances at center frequencies of the respective octave bands, respectively;
a determining unit, configured to determine that a largest one of the first auditory imperceptible distances is the auditory imperceptible distance.
Optionally, the calculating unit is configured to calculate the first auditory imperceptible distance r according to the following formula2：
Wherein L is1Is the sound pressure level, L, in the sound information of the first octave band2Is the sound pressure level, L, of the first octave band sound at the first location2Is a sound pressure level higher in a quiet environment and in an average hearing ability of the human ear for the first octave band sound, the distance r between the first location and the armored car under test2，r1Is the distance between the first measuring point and the armored car to be measured, AeA noise attenuation factor for the first octave band sound; the first octave band is any one of the plurality of octave bands.
Optionally, a free field microphone is used when the sound pressure level in the first sound information is collected at the first measurement point, the sound level meter selects "F" time weighting, and sets an equivalent continuous sound level gear or a maximum value holding gear according to test requirements, and the integration time is not less than 8 s.
Optionally, the number of the first measurement points is multiple, the number of the second measurement points is the same as that of the first measurement points, each second measurement point is located on an extension line of a connecting line between a center point of the measurement area and the first measurement point, and the armored vehicle to be measured is parked at the center position in the measurement area in a stationary manner, or the armored vehicle to be measured runs in the measurement area at a constant speed, or the armored vehicle to be measured runs in the measurement area at an accelerated manner.
In the embodiment of the application, in order to ensure that the background noise meets the test requirement in the process of measuring the concealed noise of the armored vehicle, sound information is collected at different positions away from the armored vehicle to be measured, whether the background noise meets the test requirement is judged by comparing the sound information collected at different positions, if the test requirement is met, the auditory insensible distance of the noise of the armored vehicle to be measured is determined based on the sound information measured at the measuring point close to the armored vehicle to be measured, and therefore the accuracy of the determined auditory insensible distance of the noise of the armored vehicle to be measured can be ensured.
Drawings
FIG. 1 is a schematic flow chart diagram of a method for measuring concealed noise of an armored vehicle in an embodiment of the present application;
FIG. 2 is a schematic diagram of a distribution of measurement points in an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a concealed noise measuring device of an armored vehicle in an embodiment of the application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The method and the device for measuring the concealed noise of the armored vehicle provided by the embodiment of the application are described in detail by specific embodiments and application scenarios thereof in the following with reference to the attached drawings.
Referring to fig. 1, the embodiment of the present application provides a method for measuring concealed noise of an armored vehicle, which includes:
step 101: acquiring first sound information acquired at a first measuring point and second sound information acquired at a second measuring point at the same time; wherein the distance between the first measuring point and the armored car to be measured is smaller than the second measuring point;
step 102: judging whether the background noise meets a preset test condition when the first sound information is obtained through measurement according to the first sound information and the second sound information;
for example, it may be determined whether the sounds with the frequencies, of the first sound information and the second sound information, whose intensities are greater than a preset value are consistent through sound spectrum analysis, and whether the background noise is lower than the noise of the armored car to be tested by more than 10 dB.
Step 103: and if the background noise meets the preset test condition when the first sound information is obtained through measurement, determining the auditory sensorless distance aiming at the noise of the armored car to be tested according to the first sound information. The auditory insensible distance for the noise of the armored car to be tested means that the noise of the armored car to be tested can not be sensed by human ears at the distance.
In the embodiment of the application, in order to ensure that the background noise meets the test requirement in the process of measuring the concealed noise of the armored vehicle, sound information is collected at different positions away from the armored vehicle to be measured, whether the background noise meets the test requirement is judged by comparing the sound information collected at different positions, if the test requirement is met, the auditory insensible distance of the noise of the armored vehicle to be measured is determined based on the sound information measured at the measuring point close to the armored vehicle to be measured, and therefore the accuracy of the determined auditory insensible distance of the noise of the armored vehicle to be measured can be ensured.
Optionally, the determining, according to the first sound information and the second sound information, whether the background noise when the first sound information is obtained by measurement satisfies a preset test condition includes:
fingerprint extraction is carried out on the first sound information and the second sound information respectively;
and comparing the fingerprint of the first sound information with the fingerprint of the second sound information, acquiring the information of the background noise, and judging whether the background noise meets a preset test condition.
Further optionally, the performing fingerprint extraction on the first sound information and the second sound information respectively includes:
respectively converting the first sound information and the second sound information according to the following formulas:
x1(t)＝10×lg[x0(t)](ii) a Wherein x is0(t) is the original sound information (first sound information or second sound information), x1(t) is the converted sound information;
and performing short-time Fourier transform processing on the converted sound information, calculating power spectral density, and outputting frequency spectral data, wherein the formula is as follows:
wherein w (t) is a sliding window function, mR is the center time point of the next window, R is the step length, and ω is the angular frequency;
finding out an amplitude peak value by using a local maximum algorithm, generating a frequency index/time index pair set of the peak value, and arranging according to a time index positive sequence;
the fingerprint is computed resulting in fingerprint/time offset pairs. The calculation of the fingerprint specifically comprises: and performing character string splicing on the amplitude of the nth peak value, the amplitude of the (n + m) th peak value and the time difference between the two peak values, and calculating the characteristics of the spliced result by using a Hash algorithm to obtain the fingerprint.
Optionally, the first sound information includes sound information of multiple octave bands; for example, sound information of a plurality of frequency doubling bands, whose center frequencies may be 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000Hz, may be respectively recorded when the first sound information is collected;
the determining an auditory imperceptible distance for the armored car noise under test from the first sound information includes:
calculating a first auditory unperceivable distance at a center frequency of each of the octave bands, respectively;
determining the largest one of the first auditory imperceptible distances as the auditory imperceptible distance.
Optionally, the separately calculating the first inaudible distance at the center frequency of each octave band includes:
calculating the first auditory imperceptible distance r according to the following formula2：
Wherein L is1Is the sound pressure level, L, in the sound information of the first octave band2Is the sound pressure level, L, of the sound of the first octave band at the first location2Is a sound pressure level higher in a quiet environment and in average hearing of the human ear for the first octave band sound, the distance r between the first location and the armored car under test2，r1Is the distance between the first measuring point and the armored car to be measured, AeA noise attenuation coefficient for the first octave band sound; the first octave band is any one of the plurality of octave bands.
Optionally, a free field microphone is used when the sound pressure level in the first sound information is collected at the first measurement point, the sound level meter selects "F" time weighting, and sets an equivalent continuous sound level gear or a maximum value holding gear according to test requirements, and the integration time is not less than 8 s.
Optionally, the number of the first measurement points is multiple, the number of the second measurement points is the same as that of the first measurement points, each second measurement point is located on an extension line of a connecting line between a center point of the measurement area and the first measurement point, and the armored vehicle to be measured is parked at the center position in the measurement area in a stationary manner, or the armored vehicle to be measured runs in the measurement area at a constant speed, or the armored vehicle to be measured runs in the measurement area at an accelerated manner.
Wherein, the measuring area is the area involved in the measuring process in the test field.
The following illustrates the procedure of the armored vehicle covert noise measurement method. The armored vehicle to be tested should meet the following requirements: a) the technical state of the whole vehicle is good, and the power transmission device, the operating device and the action system meet the specified technical state requirements of the vehicle; b) the fuel oil, the lubricating oil and the cooling liquid meet the requirements of the use and maintenance specifications; c) matching the weight of the battle according to the specified position, and fixing vehicle-mounted spare parts and accessories; d) the tire pressure of the wheeled vehicle is required to meet the requirements of the use and maintenance specifications; e) an armored vehicle equipped with two metal and rubberized tracks was tested under two track conditions, respectively. The meteorological conditions during measurement should satisfy: a) the test is avoided under the meteorological conditions of rain, snow and fog, and the environmental temperature meets the temperature requirement of normal work of the armored car to be tested; b) when the wind speed of a test site is not more than 5.4m/s and the wind speed is more than 1m/s, a wind shield is used for a microphone for testing the noise outside the vehicle; c) the environmental temperature, the humidity, the air pressure and the electromagnetic field meet the use requirements of a test instrument; d) the meteorological parameter measuring instrument is arranged near a test field, and the height of the meteorological parameter measuring instrument is 1.2 m. The meteorological parameter measuring instrument comprises an anemometer, a thermometer and a relative hygrometer, the precision requirement of the anemometer is +/-0.1 m/s, the precision requirement of the thermometer is +/-0.2 ℃, and the precision requirement of the relative hygrometer is +/-3%. The sound level meter (other measuring systems equivalent to the sound level meter can also be adopted) should not be lower than the requirement of the class-1 sound level meter specified in GB/T3785.1, the sound level meter should have a time integration function, and the upper limit of the measuring range is not less than 130 dB. When using a system that automatically samples and measures the weighted sound level of a, the reading interval should be no more than 30 ms. The test instruments and equipment used for the test are qualified by the relevant metrological verification mechanism and are in the valid period. No other persons than the driver and the necessary test person are allowed in the vicinity of the measuring point inside or outside the vehicle, the test person being kept at a distance of about 0.5m from the sound level meter.
1. And (3) carrying out noise hiding measurement when the armored car to be measured is statically parked at a central position in the measurement area and the engine idles.
1.1, carrying out the following test preparation:
a) the free field microphone is selected, the sound level meter selects F time weighting and is set as an equivalent continuous sound level gear (L)eq) The integration time is not less than 8 s;
b) the microphones are arranged at 16 measuring points shown in figure 2 (wherein 11-18 are first measuring points, 21-28 are second measuring points, 1 is the armored car to be measured, O is the central position of the armored car to be measured, l1 is the length of the armored car to be measured, R is more than or equal to 3l1), the height is 1.2m from the ground, and the direction of the maximum sensitivity points to the armored car to be measured;
c) the vehicle-mounted equipment determines whether to start up according to the actual use condition, wherein the air conditioner and the heating device are started up with one higher noise.
1.2, the test steps are as follows:
a) the armored car to be tested is parked in a testing place, and doors and windows are closed;
b) the transmission is placed in a neutral gear, and the engine idles at an idle speed and a calibrated rotating speed respectively;
c) the sound information of each measurement point (including the total sound pressure level and the sound pressure levels of 8 octave bands with center frequencies of 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000 Hz) is tested and recorded, each first measurement point is measured three times (the second measurement point 21 is measured simultaneously with the first measurement point 11, the second measurement point 22 is measured simultaneously with the first measurement point 12, the second measurement point 23 is measured simultaneously with the first measurement point 13, the second measurement point 24 is measured simultaneously with the first measurement point 14, the second measurement point 25 is measured simultaneously with the first measurement point 15, the second measurement point 26 is measured simultaneously with the first measurement point 16, the second measurement point 27 is measured simultaneously with the first measurement point 17, and the second measurement point 28 is measured simultaneously with the first measurement point 18).
And 1.3, recording measurement data, wherein the measured data can be recorded item by adopting a table.
1.4, measurement data processing:
respectively comparing the second sound information collected at the second measurement point 21 with the first sound information collected at the first measurement point 11 at the same time, the second sound information collected at the second measurement point 22 with the first sound information collected at the first measurement point 12 at the same time, the second sound information collected at the second measurement point 23 with the first sound information collected at the first measurement point 13 at the same time, the second sound information collected at the second measurement point 24 with the first sound information collected at the first measurement point 14 at the same time, the second sound information collected at the second measurement point 25 with the first sound information collected at the first measurement point 15 at the same time, and the first sound information collected at the first measurement point 15 at the same time, the second sound information collected at the second measurement point 26 with the first sound information collected at the first measurement point 16 at the same time The second sound information collected at the second measurement point 27 and the first sound information collected at the first measurement point 17 at the same time, and the second sound information collected at the second measurement point 28 and the first sound information collected at the first measurement point 18 at the same time, determine whether the background noise meets the test requirement when the first sound information is obtained by measurement. And if the background noise meets the test requirement when the first sound information is obtained through measurement, determining the auditory imperceptible distance according to the first sound information, and taking the largest one of the determined 8 auditory imperceptible distances as the auditory imperceptible distance of the noise of the armored car to be tested.
2. And the armored vehicle to be tested is statically parked at the central position in the measuring area, and the noise hiding performance is measured when the working device works.
2.1, carrying out test preparation according to the following contents:
a) selecting free field microphone, sound level meter selects F time weighting, and setting as equivalent continuous sound level (L)eq) The integration time is not less than 8 s;
b) the microphones are arranged at 16 measuring points shown in figure 2 (wherein 11-18 are first measuring points, 21-28 are second measuring points, 1 is the armored car to be measured, O is the central position of the armored car to be measured, l1 is the length of the armored car to be measured, R is more than or equal to 3l1), the height is 1.2m from the ground, and the direction of the maximum sensitivity points to the armored car to be measured;
c) the vehicle-mounted equipment determines whether to start up according to the actual use condition, wherein the air conditioner and the heating device are started up with one higher noise.
2.2, the test steps are as follows:
a) the method comprises the following steps of (1) parking an armored car to be tested in a test field, and determining whether an engine and a door and window are started or not according to actual use conditions;
b) the working device works in a full load state;
c) the sound information (including the total sound pressure level and the 8 octave frequency band sound pressure levels with center frequencies of 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000 Hz) of each measuring point is tested and recorded, each first measuring point measures three times (the second measuring point 21 measures simultaneously with the first measuring point 11, the second measuring point 22 measures simultaneously with the first measuring point 12, the second measuring point 23 measures simultaneously with the first measuring point 13, the second measuring point 24 measures simultaneously with the first measuring point 14, the second measuring point 25 measures simultaneously with the first measuring point 15, the second measuring point 26 measures simultaneously with the first measuring point 16, the second measuring point 27 measures simultaneously with the first measuring point 17, and the second measuring point 28 measures simultaneously with the first measuring point 18).
And 2.3, recording measurement data, specifically, recording the measured data item by adopting a table.
2.4, processing measurement data:
respectively comparing the second sound information collected at the second measurement point 21 with the first sound information collected at the first measurement point 11 at the same time, the second sound information collected at the second measurement point 22 with the first sound information collected at the first measurement point 12 at the same time, the second sound information collected at the second measurement point 23 with the first sound information collected at the first measurement point 13 at the same time, the second sound information collected at the second measurement point 24 with the first sound information collected at the first measurement point 14 at the same time, the second sound information collected at the second measurement point 25 with the first sound information collected at the first measurement point 15 at the same time, and the first sound information collected at the first measurement point 15 at the same time, the second sound information collected at the second measurement point 26 with the first sound information collected at the first measurement point 16 at the same time The second sound information collected at the second measurement point 27 and the first sound information collected at the first measurement point 17 at the same time, and the second sound information collected at the second measurement point 28 and the first sound information collected at the first measurement point 18 at the same time, determine whether the background noise meets the test requirement when the first sound information is obtained by measurement. And if the background noise meets the test requirement when the first sound information is obtained through measurement, determining the auditory imperceptible distance according to the first sound information, and taking the largest one of the determined 8 auditory imperceptible distances as the auditory imperceptible distance of the noise of the armored car to be tested.
3. And measuring the noise concealment when the armored car to be measured runs at a constant speed.
3.1, carrying out test preparation according to the following contents:
a) the free field microphone is selected, the sound level meter selects F time weighting and is set as an equivalent continuous sound level gear (L)eq) The integration time is not less than 8 s;
b) an annular runway: the annular runway is marked with a circle with the radius not less than 40m and a circle center, the pavement is a straight, dry and tidy gravel road and paved road with the longitudinal gradient less than 1%, the pavement does not contain loose sundries such as accumulated snow, and the length of the annular runway is required to ensure the requirement of noise measurement in the armored car to be measured when the armored car runs at a constant speed or accelerates. Within 30m of each side of the center line of the road, no large sound wave reflectors such as buildings and enclosing walls should be present. The ground within the radius range of 80m from the center of the circular track should be dry, flat and wide.
A free field microphone is arranged at the position (a first test point) of the circle center of the annular runway, which is 1.2m away from the ground, and the direction of the maximum sensitivity is upward. And a free field microphone is arranged at a position 1.2m away from the ground at a second test point outside the annular runway, and the maximum sensitivity direction faces upwards. The distance between the second test point and the annular runway is larger than the distance between the annular runway and the circle center position of the annular runway.
c) The vehicle-mounted equipment determines whether to start up according to the actual use condition, wherein the air conditioner and the heating device are started up with one higher noise.
3.2, the test steps are as follows:
a) the armored vehicle to be tested closes the door and window, and starts from the gear I, the allowable gears (manual transmission vehicle: the engine works at a calibrated rotating speed; automatic transmission vehicle: the engine works at the highest rotating speed without automatic gear-up), and the engine respectively runs around the annular runway at a constant speed in the clockwise direction and the anticlockwise direction;
b) the sound information of each measurement point (including the total sound pressure level and the sound pressure levels of 8 octave bands with center frequencies of 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000 Hz) is tested and recorded, each first measurement point is measured three times (the second measurement point 21 is measured simultaneously with the first measurement point 11, the second measurement point 22 is measured simultaneously with the first measurement point 12, the second measurement point 23 is measured simultaneously with the first measurement point 13, the second measurement point 24 is measured simultaneously with the first measurement point 14, the second measurement point 25 is measured simultaneously with the first measurement point 15, the second measurement point 26 is measured simultaneously with the first measurement point 16, the second measurement point 27 is measured simultaneously with the first measurement point 17, and the second measurement point 28 is measured simultaneously with the first measurement point 18).
And 3.3, recording measurement data, specifically, recording the measured data item by adopting a table.
3.4, measurement data processing: and respectively processing the measurement data when the vehicle runs around the annular track at a constant speed in the clockwise direction and the anticlockwise direction.
Respectively comparing the second sound information collected at the second measurement point 21 with the first sound information collected at the first measurement point 11 at the same time, the second sound information collected at the second measurement point 22 with the first sound information collected at the first measurement point 12 at the same time, the second sound information collected at the second measurement point 23 with the first sound information collected at the first measurement point 13 at the same time, the second sound information collected at the second measurement point 24 with the first sound information collected at the first measurement point 14 at the same time, the second sound information collected at the second measurement point 25 with the first sound information collected at the first measurement point 15 at the same time, and the first sound information collected at the first measurement point 15 at the same time, the second sound information collected at the second measurement point 26 with the first sound information collected at the first measurement point 16 at the same time The second sound information collected at the second measurement point 27 and the first sound information collected at the first measurement point 17 at the same time, and the second sound information collected at the second measurement point 28 and the first sound information collected at the first measurement point 18 at the same time, determine whether the background noise meets the test requirement when the first sound information is obtained by measurement. And if the background noise meets the test requirement when the first sound information is obtained through measurement, determining the auditory imperceptible distance according to the first sound information, and taking the largest one of the determined 8 auditory imperceptible distances as the auditory imperceptible distance of the noise of the armored car to be tested.
4. And measuring the noise concealment of the armored car to be measured during the accelerated running.
4.1, carrying out test preparation according to the following contents:
a) the free field microphone is selected, the sound level meter selects F time weighting and is set as a maximum value keeping gear (L)Fmax) The integration time is not less than 8 s;
b) an annular runway: the annular runway is marked with a circle with the radius not less than 40m and a circle center, the pavement is a straight, dry and tidy gravel road and paved road with the longitudinal gradient less than 1%, the pavement does not contain loose sundries such as accumulated snow, and the length of the annular runway is required to ensure the requirement of noise measurement in the armored car to be measured when the armored car runs at a constant speed or accelerates. Within 30m of each side of the center line of the road, no large sound wave reflectors such as buildings and enclosing walls should be present. The ground within the radius range of 80m from the center of the circular track should be dry, flat and wide.
A free field microphone is arranged at the position 1.2m away from the ground at the circle center position (a first test point) of the annular runway, and the direction of the maximum sensitivity is upward. And a free field microphone is arranged at a position 1.2m away from the ground at a second test point outside the annular runway, and the maximum sensitivity direction faces upwards. The distance between the second test point and the annular runway is greater than the distance between the annular runway and the circle center position of the annular runway.
c) The vehicle-mounted equipment determines whether to start up according to the actual use condition, wherein the air conditioner and the heating device are started up with one higher noise.
4.2, the test steps are as follows:
a) closing the door and window of the armored car to be tested;
b) for a manual transmission vehicle, an engine works at 1/2 calibrated rotation speed under each allowed gear, a detected armored vehicle runs on an annular runway at constant speed in clockwise and anticlockwise directions respectively, then an accelerator pedal is quickly stepped to the bottom, and the accelerator pedal is released after the rotation speed of the engine reaches the calibrated rotation speed;
c) for an automatic transmission (including a manual-automatic integrated transmission) vehicle, a detected armored vehicle is stopped on an annular runway, then an accelerator pedal is quickly stepped to the bottom, and the accelerator pedal is released after the vehicle is accelerated to the maximum speed allowed by a road;
d) the sound information of each measurement point (including the total sound pressure level and the sound pressure levels of 8 octave bands with center frequencies of 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000 Hz) is tested and recorded, each first measurement point is measured three times (the second measurement point 21 is measured simultaneously with the first measurement point 11, the second measurement point 22 is measured simultaneously with the first measurement point 12, the second measurement point 23 is measured simultaneously with the first measurement point 13, the second measurement point 24 is measured simultaneously with the first measurement point 14, the second measurement point 25 is measured simultaneously with the first measurement point 15, the second measurement point 26 is measured simultaneously with the first measurement point 16, the second measurement point 27 is measured simultaneously with the first measurement point 17, and the second measurement point 28 is measured simultaneously with the first measurement point 18).
And 4.3, recording measurement data, wherein the measured data can be recorded item by adopting a table.
4.4, measurement data processing: and respectively processing the measurement data when the vehicle runs around the annular track at a constant speed in the clockwise direction and the anticlockwise direction.
Respectively comparing second sound information collected at a second measurement point 21 with first sound information collected at a first measurement point 11 at the same time, second sound information collected at a second measurement point 22 with first sound information collected at a first measurement point 12 at the same time, second sound information collected at a second measurement point 23 with first sound information collected at a first measurement point 13 at the same time, second sound information collected at a second measurement point 24 with first sound information collected at a first measurement point 14 at the same time, second sound information collected at a second measurement point 25 with first sound information collected at a first measurement point 15 at the same time, second sound information collected at the second measurement point 25 with first sound information collected at the first measurement point 15 at the same time, and first sound information collected at the first measurement point 15 at the same time, second sound information collected at a second measurement point 26 with first sound information collected at a first measurement point 16 at the same time The second sound information collected at the second measurement point 27 and the first sound information collected at the first measurement point 17 at the same time, and the second sound information collected at the second measurement point 28 and the first sound information collected at the first measurement point 18 at the same time, determine whether the background noise meets the test requirement when the first sound information is obtained by measurement. And if the background noise meets the test requirement when the first sound information is obtained through measurement, determining the auditory imperceptible distance according to the first sound information, and taking the largest one of the determined 8 auditory imperceptible distances as the auditory imperceptible distance of the noise of the armored car to be tested.
The method for evaluating the test result comprises the following steps:
a) when there is a requirement in tactical technical indexes, according to the index requirement, evaluating whether it meets the tactical technical index requirement;
b) when there is no requirement in tactical technical indexes, the performance can be evaluated by adopting a method of comparing with similar vehicles.
Referring to fig. 3, the embodiment of the present application further provides a device for measuring concealed noise of an armored vehicle, which includes:
a sound information acquiring module 301, configured to acquire first sound information acquired at a first measurement point and second sound information acquired at a second measurement point at the same time; the distance between the first measuring point and the armored car to be measured is smaller than that between the first measuring point and the armored car to be measured;
a determining module 302, configured to determine whether a background noise obtained by measuring the first sound information satisfies a preset test condition according to the first sound information and the second sound information;
the determining module 303 is configured to determine, according to the first sound information, an auditory sensorless distance for the noise of the armored car to be tested if the measured background noise satisfies a preset test condition when the first sound information is obtained.
Optionally, the first sound information includes sound information of multiple octave frequency bands;
the determining module 303 includes:
a calculating unit for calculating first auditory unperceived distances at center frequencies of the respective octave bands, respectively;
a determining unit, configured to determine that one of the first auditory imperceptible distances with the largest median value is the auditory imperceptible distance.
Optionally, the calculating unit is configured to calculate the first auditory imperceptible distance r according to the following formula2：
Wherein L is1Is the sound pressure level, L, in the sound information of the first octave band2Is the sound pressure level, L, of the first octave band sound at the first location2Is taken as a quiet environment and a pair of human earsAt a higher sound pressure level of the average hearing of the first octave band sound, the distance between the first location and the armored car under test is r2，r1Is the distance between the first measuring point and the armored car to be measured, AeA noise attenuation coefficient for the first octave band sound; the first octave band is any one of the plurality of octave bands.
Optionally, a free field microphone is used when the sound pressure level in the first sound information is collected at the first measurement point, the sound level meter selects "F" time for weighting, and sets an equivalent continuous sound level or a maximum value holding level according to test requirements, and the integration time is not less than 8 s.
Optionally, the number of the first measurement points is multiple, the number of the second measurement points is the same as that of the first measurement points, each second measurement point is located on an extension line of a connecting line between a center point of the measurement area and the first measurement point, and the armored vehicle to be measured is parked at the center position in the measurement area in a stationary manner, or the armored vehicle to be measured runs in the measurement area at a constant speed, or the armored vehicle to be measured runs in the measurement area at an accelerated manner.
The armored vehicle covert noise measuring device provided by the embodiment of the application can realize each process realized by the method embodiment, and is not repeated here for avoiding repetition.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the present embodiments are not limited to those precise embodiments, which are intended to be illustrative rather than restrictive, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope of the appended claims.
Claims (10)
1. A method for measuring concealed noise of an armored vehicle is characterized by comprising the following steps:
acquiring first sound information acquired at a first measuring point and second sound information acquired at a second measuring point at the same moment; the distance between the first measuring point and the armored car to be measured is smaller than that between the second measuring point and the armored car to be measured, and the second measuring points are all located on an extension line of a connecting line of a central point of a measuring area and the first measuring point;
according to the first sound information and the second sound information, whether the background noise obtained by measuring the first sound information meets a preset test condition is judged, and the test condition is as follows: judging whether the sounds with the intensity larger than a preset value in the first sound information and the second sound information are consistent or not through sound spectrum analysis, and judging whether the background noise is lower than the noise of the armored car to be tested by more than 10dB or not;
and if the background noise meets the preset test condition when the first sound information is obtained through measurement, determining the auditory insensible distance aiming at the noise of the armored car to be tested according to the first sound information.
2. The method according to claim 1, wherein the first sound information includes sound information of a plurality of octave bands;
the determining an auditory imperceptible distance for the armored car noise under test from the first sound information includes:
calculating first auditory unperceived distances at the center frequencies of the octave bands respectively;
determining the largest one of the first auditory imperceptible distances as the auditory imperceptible distance.
3. The method of claim 2, wherein said separately calculating a first auditory imperceptible distance at a center frequency of each of said octave bands comprises:
calculating the first auditory imperceptible distance r according to the following formula2：
Wherein L is1Is the sound pressure level, L, in the sound information of the first octave band2Is the sound pressure level, L, of the first octave band sound at the first location2Is taken to be the quiet environment and a higher one of the average hearing of the human ear for said first octave band sound, r1Is the distance between the first measuring point and the armored car to be measured, AeA noise attenuation factor for the first octave band sound; the first octave band is any one of the plurality of octave bands.
4. The method of claim 3, wherein a free field microphone is used to collect the sound pressure level in the first sound information at the first measurement point, and a sound level meter selects an "F" time weighting and sets an equivalent continuous sound level or a maximum value holding level according to the test requirement, and the integration time is not less than 8 s.
5. The method according to claim 1, wherein the number of the first measuring points is multiple, the number of the second measuring points is the same as the number of the first measuring points, the armored vehicle to be tested is parked at a central position in the measuring area in a stationary manner, or the armored vehicle to be tested runs at a constant speed in the measuring area, or the armored vehicle to be tested runs at an accelerated speed in the measuring area.
6. A device for measuring concealed noise of an armored vehicle, comprising:
the sound information acquisition module is used for acquiring first sound information acquired at a first measuring point and second sound information acquired at a second measuring point at the same moment; the distance between the first measuring point and the armored car to be measured is smaller than that between the second measuring point and the armored car to be measured, and the second measuring points are all located on an extension line of a connecting line of a central point of a measuring area and the first measuring point;
the judging module is used for judging whether the background noise when the first sound information is obtained through measurement meets a preset test condition according to the first sound information and the second sound information, and the test condition is as follows: judging whether the sounds with the intensity larger than a preset value in the first sound information and the second sound information are consistent or not through sound spectrum analysis, and judging whether the background noise is lower than the noise of the armored car to be tested by more than 10dB or not;
and the determining module is used for determining the auditory insensible distance aiming at the noise of the armored car to be tested according to the first sound information if the background noise when the first sound information is obtained by measurement meets the preset test condition.
7. The apparatus according to claim 6, wherein the first sound information includes a plurality of octave bands of sound information;
the determining module includes:
a calculating unit for calculating first auditory unperceived distances at center frequencies of the respective octave bands, respectively;
a determining unit, configured to determine that one of the first auditory imperceptible distances with the largest median value is the auditory imperceptible distance.
8. The apparatus according to claim 7, wherein said calculating unit is configured to calculate said first auditory imperceptible distance r according to the following formula2：
Wherein L is1Is the sound pressure level, L, in the sound information of the first octave band2Is the sound pressure level, L, of the sound of the first octave band at the first location2Is taken to be the quiet environment and a higher one of the average hearing of the human ear for said first octave band sound, r1Is the distance between the first measuring point and the armored car to be measured, AeA noise attenuation factor for the first octave band sound; the first octave band is any one of the plurality of octave bands.
9. The apparatus according to claim 8, wherein a free field microphone is used for collecting the sound pressure level in the first sound information at the first measurement point, a sound level meter selects an "F" time weighting and sets an equivalent continuous sound level or a maximum value holding level according to the test requirement, and the integration time is not less than 8 s.
10. The device according to claim 6, wherein the number of the first measuring points is multiple, the number of the second measuring points is the same as the number of the first measuring points, the armored vehicle to be tested is parked at a central position in the measuring area in a stationary mode, or the armored vehicle to be tested runs at a constant speed in the measuring area, or the armored vehicle to be tested runs at an accelerated speed in the measuring area.
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| CN107741272A (en) * | 2017-10-11 | 2018-02-27 | 青岛理工大学 | A kind of noise sound field rarefaction measuring method, system and device |
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