CN109443793B - Method for testing noise outside automobile - Google Patents

Method for testing noise outside automobile Download PDF

Info

Publication number
CN109443793B
CN109443793B CN201811190832.9A CN201811190832A CN109443793B CN 109443793 B CN109443793 B CN 109443793B CN 201811190832 A CN201811190832 A CN 201811190832A CN 109443793 B CN109443793 B CN 109443793B
Authority
CN
China
Prior art keywords
noise
automobile
testing
tire
executing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201811190832.9A
Other languages
Chinese (zh)
Other versions
CN109443793A (en
Inventor
张健
罗家庆
文金辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dongfeng Motor Co Ltd
Original Assignee
Dongfeng Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dongfeng Motor Co Ltd filed Critical Dongfeng Motor Co Ltd
Priority to CN201811190832.9A priority Critical patent/CN109443793B/en
Publication of CN109443793A publication Critical patent/CN109443793A/en
Application granted granted Critical
Publication of CN109443793B publication Critical patent/CN109443793B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

Disclosure of the inventionThe method for testing the noise outside the automobile comprises the following steps of: and B, executing the step A: silencing an air inlet and an air outlet of an automobile through a silencer, packaging a shell of an exhaust system, extinguishing the automobile by using an original automobile tire and performing neutral sliding operation on the automobile, and testing the noise outside the automobile to be SaAnd road surface temperature of Ta(ii) a Then, free rolling tire noise STire roller＝Sa+K(T0‑Ta) Wherein T is0K is a tire noise temperature conversion coefficient as a reference temperature. The method for testing the automobile noise can eliminate the influence of the road surface temperature on the calculation result, can separate the self-generated rolling tire noise and the traction torque tire noise, can identify each main sound source of the automobile noise to the maximum extent, and improves the accuracy of the experiment result.

Description

Method for testing noise outside automobile
Technical Field
The invention relates to the technical field of automobile noise separation, in particular to a method for testing automobile external noise.
Background
The sound sources of the noises outside the vehicle are mainly engine noises, drive train noises, intake noises, exhaust port noises, exhaust radiation noises and tire noises. The tire noise includes a free-rolling tire noise generated when the tire rolls freely and a traction torque tire noise generated when the tire rolls by the torque of the engine. Traction torque tire noise should be caused primarily by the tread on the tire as it rubs against the ground. And the degree of noise of the tire at different temperatures is also different.
In the prior art, the method for separating the automobile noise sources does not consider temperature factors, so that the experimental result is inaccurate. The method for separating the automobile noise source in the prior art does not separate the intake noise. The prior art methods for separating noise from a vehicle noise source also do not separate the noise from a free rolling tire from the noise from a traction torque tire. The above-described drawbacks cause a problem that a main noise source cannot be accurately identified when a vehicle exterior noise factor analysis experiment is performed, and a countermeasure cannot be effectively specified.
Disclosure of Invention
The invention aims to provide a method for testing the noise outside an automobile, which can accurately separate a noise source.
The technical scheme of the invention provides a method for testing noise outside an automobile, which comprises the following steps:
a free rolling tire noise testing step comprising:
and B, executing the step A: silencing an air inlet and an air outlet of an automobile through a silencer, packaging a shell of an exhaust system, extinguishing the automobile by using an original automobile tire and performing neutral sliding operation on the automobile, and testing the noise outside the automobile to be SaAnd road surface temperature of Ta；
Then, free rolling tire noise STire roller＝Sa+K(T0-Ta) Wherein T is0K is a tire noise temperature conversion coefficient as a reference temperature.
Further, the method also comprises the following steps:
a driveline noise testing step comprising:
and B, executing the step B: silencing an air inlet and an air outlet of an automobile through a silencer, packaging a shell of an exhaust system, extinguishing the automobile by using a non-pattern smooth tire and performing neutral sliding operation on the automobile, and testing the noise outside the automobile to be SbAnd road surface temperature of Tb；
And C, executing the step C: carrying out three-gear flameout and sliding operation on the automobile, and testing the noise outside the automobile to be ScAnd road surface temperature of Tc；
Then, the power train noise SConveying appliance＝Sc-(Sb+K(Tc-Tb))。
Further, the method also comprises the following steps:
an engine noise testing step, comprising:
executing the step C;
and D, executing the step D: normal acceleration operation is carried out on the automobile, and the noise outside the automobile is tested to be SdAnd road surface temperature of Td；
Then, engine noise SHair-like device＝Sd-(Sb+K(Td-Tb))-SConveying appliance。
Further, the method also comprises the following steps:
a traction torque tire noise testing step comprising:
executing the step A;
and E, executing the step E: carrying out normal acceleration running operation on the automobile, and testing the noise outside the automobile to be SeAnd road surface temperature of Te；
Executing the step B;
executing the step D: normal acceleration operation is carried out on the automobile, and the noise outside the automobile is tested to be SdAnd road surface temperature of Td；
Then, traction torque tire noise STire twist＝Se-(Sa+K(Te-Ta))-(Sd-(Sb+K(Td-Tb)))+K(T0-Te)。
Further, the method also comprises the following steps:
an exhaust radiation noise testing step, comprising:
performing the step D;
and F, executing: removing the package on the shell of the exhaust system, carrying out normal acceleration operation on the automobile, and testing the noise outside the automobile to be SfAnd road surface temperature of Tf；
Then, the exhaust radiation noise SSpoke＝Sf-(Sb+K(Tf-Tb))-(Sd-(Sb+K(Td-Tb)))。
Further, the method also comprises the following steps:
an intake noise testing step comprising:
performing the step F;
and G, executing: removing the silencer on the air inlet, carrying out normal acceleration operation on the automobile, and testing the noise outside the automobile to be SgAnd road surface temperature of Tg；
Then, the intake noise SInto＝Sg-(Sb+K(Tg-Tb))-(Sf-(Sb+K(Tf-Tb)))。
Further, the method also comprises the following steps:
an exhaust noise testing step, comprising:
executing the step G;
and H, executing the step: removing the silencer on the exhaust port, performing normal acceleration operation on the automobile, and testing the noise outside the automobile to be ShAnd road surface temperature of Th；
Then, exhaust noise SRow board＝Sh-(Sb+K(Th-Tb))-(Sg-(Sb+K(Tg-Tb)))。
Further, the method also comprises the following steps:
the full noise test step includes:
executing the step I: the automobile uses the original tire, does not muffle the air inlet and the exhaust outlet of the automobile, does not pack the shell of the exhaust silencing system, operates the automobile normally with higher speed, and tests the noise outside the automobile as SiAnd road surface temperature of Ti。
Further, the method also comprises the following steps:
the step of comparing and judging comprises the following steps:
and step J is executed: summing the free-rolling tire noise, the driveline noise, the traction torque tire noise, the engine noise, the exhaust emission noise, the intake noise, and the exhaust noise to obtain SGeneral assembly；
And executing the step K: will SiAnd SGeneral assemblyComparison and judgment, e.g. SiAnd SGeneral assemblyIf the difference value is within the preset range, the test is judged to be qualified, if S isiAnd SGeneral assemblyIf the difference exceeds the preset range, the noise test is carried out on the automobile again.
Further, the method also comprises the following steps:
and a comprehensive test judgment step, wherein the execution sequence of the steps is as follows:
executing the step A;
performing the step E;
executing the step B;
executing the step C;
performing the step D;
performing the step F;
executing the step G;
performing the step H;
performing the step I;
performing the step J;
and executing the step K.
By adopting the technical scheme, the method has the following beneficial effects:
the method for testing the noise outside the automobile can eliminate the influence of the road surface temperature on the calculation result, can separate the noise of the self-running tire and the noise of the traction torque tire, can identify each main sound source of the noise outside the automobile to the maximum extent, and improves the accuracy of the experimental result.
Drawings
Fig. 1 is a flowchart of a method for testing noise outside an automobile according to an embodiment of the present invention.
FIG. 2 is a schematic view of the attachment of a silencer to an air intake;
FIG. 3 is a schematic view of the connection of a muffler to an exhaust port;
FIG. 4 is a schematic view of an exhaust connection tube;
fig. 5 is a schematic structural view of a silencer.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
The detailed specification of "normal acceleration operation of the vehicle" described below can be referred to "GB 1495-2002 vehicle acceleration driving outside noise limit and measurement method". The housing of the exhaust system described below is enclosed, meaning that the entire exhaust system is wrapped with a high temperature resistant sound absorbing material and a high temperature resistant soundproof material to eliminate exhaust system radiation noise.
As shown in fig. 1, a method for testing noise outside an automobile according to an embodiment of the present invention includes the following steps:
a free rolling tire noise testing step comprising:
and B, executing the step A: silencing an air inlet and an air outlet of an automobile through a silencer, packaging a shell of an exhaust system, extinguishing the automobile by using an original automobile tire and performing neutral sliding operation on the automobile, and testing the noise outside the automobile to be SaAnd road surface temperature of Ta。
Then, free rolling tire noise STire roller＝Sa+K(T0-Ta) Wherein T is0K is a tire noise temperature conversion coefficient as a reference temperature.
Since the tire noise deteriorates as the temperature decreases, and the road surface temperature specified in the tire coasting pass noise test standard is 5 to 40 ℃, T0The value is recommended to be 5 ℃.
When the road temperature is more than 20 ℃, K is-0.03 dB (A)/DEG C; when the temperature of the road surface is less than or equal to 20 ℃, K is-0.06 dB (A)/DEG C.
In the step A, silencers or silencing devices are arranged on the air inlet and the air outlet of the automobile, and the shell of the exhaust system is packaged to avoid exhaust radiation noise. The original vehicle tire is used, the original vehicle tire is a tire with patterns on the tread, and when an engine rolls under traction, the tire noise comprises free rolling tire noise and traction torque tire noise.
When the automobile is put into neutral after flameout, the automobile slides in flameout neutral, and at the moment, the noise outside the automobile mainly comprises the noise of the free rolling tire.
Tire noise is in turn related to road surface temperature, and generally, the lower the temperature, the greater the tire noise.
Then, free rolling tire noise STire roller＝Sa+K(T0-Ta)。
Therefore, in the step, the influence of the road surface temperature on the calculation result can be eliminated, the free rolling tire noise can be accurately calculated, and the accuracy of the experiment is improved.
Preferably, as shown in fig. 1, the method for testing noise outside an automobile further comprises a power train noise testing step.
A driveline noise testing step comprising:
and B, executing the step B: silencing an air inlet and an air outlet of an automobile through a silencer, packaging a shell of an exhaust system, extinguishing the automobile by using a non-pattern smooth tire and performing neutral sliding operation on the automobile, and testing the noise outside the automobile to be SbAnd road surface temperature of Tb；
And C, executing the step C: carrying out three-gear flameout and sliding operation on the automobile, and testing the noise outside the automobile to be ScAnd road surface temperature of Tc；
Then, the power train noise SConveying appliance＝Sc-(Sb+K(Tc-Tb))。
The concrete steps of the step C are as follows: silencing an air inlet and an air outlet of an automobile through a silencer, packaging a shell of an exhaust system, using a non-pattern smooth tire to extinguish the automobile in three stages and performing sliding operation on the automobile, and testing the noise outside the automobile to be ScAnd road surface temperature of Tc。
Since the plain tire is used in both step B and step C, the tire noise includes only the free-rolling tire noise.
In step B, the noise outside the vehicle mainly includes: free-rolling tire noise of a slick tire.
In step C, the driveline of the vehicle may also be noisy due to the vehicle third gear being turned off and coasting. The vehicle exterior noise in step C mainly includes: free rolling tire noise and driveline noise of slick tires.
SbFor car tyre at TbThe time noise needs to be converted into TcAfter the noise of the hour, K (T) is increasedc-Tb) The noise of (2).
According to the acoustic theory, the total sound pressure level LpTAnd the sound pressure level L of one of the two sound wavesp1By subtraction, the sound pressure level of another sound wave can be found:
Figure GDA0002543500990000061
from the above-mentioned theory of subtraction of sound pressure levels, the drive train noise S can be obtainedConveying appliance＝10*lg(10Sc/10-10(Sb +K(Tc-Tb))/10)。
Therefore, in the step, the influence of the road surface temperature on the calculation result of the tire noise can be eliminated, the noise of the transmission system can be accurately calculated, and the accuracy of the experiment is improved.
Wherein the proportion of the driveline noise of the automatic transmission type and the common passenger car in the vehicle exterior noise is small, and the operation of step C may not be required.
Preferably, as shown in fig. 1, the method for testing noise outside an automobile further includes an engine noise testing step.
An engine noise testing step, comprising:
and C, executing the step C, specifically: silencing an air inlet and an air outlet of an automobile through a silencer, packaging a shell of an exhaust system, using a non-pattern smooth tire to extinguish the automobile in three stages and performing sliding operation on the automobile, and testing the noise outside the automobile to be ScAnd road surface temperature of Tc。
And D, executing the step D: normal acceleration operation is carried out on the automobile, and the noise outside the automobile is tested to be SdAnd road surface temperature of Td。
The method specifically comprises the following steps: silencing the air inlet and the air outlet of the automobile through a silencer, packaging the shell of an exhaust system, using a non-pattern smooth tire to normally accelerate the automobile, and testing the noise outside the automobile to be SdAnd road surface temperature of Td。
Then, engine noise SHair-like device＝Sd-(Sb+K(Td-Tb))-SConveying appliance。
The step C mainly comprises the following steps: free tire noise and driveline noise of slick tires.
The step D mainly comprises the following steps: free tire noise of slick tires, engine noise, and driveline noise.
T in the step CcFree tire noise at temperature to TdAt free tire noise at temperature, K (T) will increased-Tc) The noise of (2). According to the above mentioned acoustic theory:
noise of engine
Figure GDA0002543500990000071
Therefore, in the step, the influence of the road surface temperature on the calculation result of the tire noise can be eliminated, the engine noise can be accurately calculated, and the accuracy of the experiment is improved.
Preferably, as shown in fig. 1, the method for testing noise outside an automobile further includes a traction torque tire noise testing step.
A traction torque tire noise testing step comprising:
executing the step A, specifically: silencing an air inlet and an air outlet of an automobile through a silencer, packaging a shell of an exhaust system, extinguishing the automobile by using an original automobile tire and performing neutral sliding operation on the automobile, and testing the noise outside the automobile to be SaAnd road surface temperature of Ta。
And E, executing the step E: carrying out normal acceleration running operation on the automobile, and testing the noise outside the automobile to be SeAnd road surface temperature of Te. The method specifically comprises the following steps: silencing the air inlet and the air outlet of the automobile through a silencer, and packaging the shell of an exhaust system, wherein the automobile uses the original tire to perform normal acceleration running operation on the automobile, and the noise outside the automobile is tested to be SeAnd road surface temperature of Te。
Executing the step B, specifically: silencing an air inlet and an air outlet of an automobile through a silencer, packaging a shell of an exhaust system, extinguishing the automobile by using a non-pattern smooth tire and performing neutral sliding operation on the automobile, and testing the noise outside the automobile to be SbAnd road surface temperatureIs Tb。
And D, executing the step D: normal acceleration operation is carried out on the automobile, and the noise outside the automobile is tested to be SdAnd road surface temperature of Td. The method specifically comprises the following steps: silencing the air inlet and the air outlet of the automobile through a silencer, packaging the shell of an exhaust system, using a non-pattern smooth tire to normally accelerate the automobile, and testing the noise outside the automobile to be SdAnd road surface temperature of Td。
Then, traction torque tire noise STire twist＝Se-(Sa+K(Te-Ta))-(Sd-(Sb+K(Td-Tb)))+K(T0-Te). The step A mainly comprises the following steps: free rolling tire noise of original vehicle tire.
Step E mainly comprises: engine noise, driveline noise, free rolling tire noise of the original vehicle tire, and traction torque tire noise.
The step B mainly comprises the following steps: free-rolling tire noise of a slick tire.
The step D mainly comprises the following steps: engine noise, driveline noise, and free-rolling tire noise of slick tires.
Converting T in step AaTemperature tire noise conversion to TeLower tire noise, increase of K (T)e-Ta) The noise of (2).
Combining T in step BbTemperature tire noise conversion to TdLower tire noise, increase of K (T)d-Tb) The noise of (2). According to the above mentioned acoustic theory:
traction torque tire noise STire twist＝10*lg(10Se/10-10(SaK(Te-Ta))/10-(10Sd/10-10(Sb+K(Td-Tb))/10))+K(T0-Te)。
Therefore, in the step, the influence of the road surface temperature on the calculation result of the tire noise can be eliminated, the noise of the traction torque tire can be accurately calculated, and the accuracy of the experiment is improved.
Preferably, as shown in fig. 1, the method for testing noise outside an automobile further includes an exhaust radiation noise testing step.
An exhaust radiation noise testing step, comprising:
and D, executing the step D, specifically: silencing the air inlet and the air outlet of the automobile through a silencer, packaging the shell of an exhaust system, using a non-pattern smooth tire to normally accelerate the automobile, and testing the noise outside the automobile to be SdAnd road surface temperature of Td。
And F, executing: removing the package on the casing of the exhaust system, carrying out normal acceleration operation on the automobile, and testing the noise outside the automobile to be SfAnd road surface temperature of Tf. Specifically, an air inlet and an air outlet of the automobile are silenced through a silencer, a shell on the exhaust system is not packaged, or the package of the shell of the exhaust system in the step D is removed or replaced by the same shell of the exhaust system which is not packaged, and the automobile uses a pattern-free smooth tire. Then, the automobile is normally accelerated, and the noise outside the automobile is tested to be SfAnd road surface temperature of Tf。
Then, the exhaust radiation noise SSpoke＝Sf-(Sb+K(Tf-Tb))-(Sd-(Sb+K(Td-Tb)))。
The step B mainly comprises the following steps: free-rolling tire noise of a slick tire.
The step D mainly comprises the following steps: engine noise, driveline noise, and free-rolling tire noise of slick tires.
Step F mainly comprises: engine noise, driveline noise, free rolling tire noise of slick tires, and exhaust radiation noise.
T in step BbTemperature tire noise conversion to TdLower tire noise, increase of K (T)d-Tb) The noise of (2).
T in step BbTemperature tire noise conversion to TfLower tire noise, increase of K (T)f-Tb) The noise of (2).
According to the above mentioned acoustic theory:
exhaust radiation noise SSpoke＝10*lg(10Sf/10-10(Sb+K(Tf-Tb))/10-(10Sd/10-10(Sb+K(Td-Tb))/10))。
Therefore, in the step, the influence of the road surface temperature on the calculation result of the tire noise can be eliminated, the exhaust radiation noise can be accurately calculated, and the accuracy of the experiment is improved.
Preferably, as shown in fig. 1, the method for testing noise outside an automobile further includes an intake noise testing step.
An intake noise testing step comprising:
and F, executing the step: the air inlet and the air outlet of the automobile are silenced through a silencer, the shell of the exhaust system is not packaged or replaced by the same shell of the exhaust system which is not packaged, and the automobile uses a non-pattern smooth tire. Then, the automobile is normally accelerated, and the noise outside the automobile is tested to be SfAnd road surface temperature of Tf。
And G, executing: removing the silencer on the air inlet, performing normal acceleration operation on the automobile, and testing the noise outside the automobile to be SgAnd road surface temperature of Tg. The method specifically comprises the following steps: the exhaust port of the automobile is silenced through a silencer, the shell of the exhaust system is not packaged or the package of the shell of the exhaust system is removed or the same shell of the exhaust system which is not packaged is replaced, the silencer on the air inlet is removed or the air inlet is not silenced, and the automobile uses a non-patterned smooth tire. Then, the automobile is normally accelerated, and the noise outside the automobile is tested to be SgAnd road surface temperature of Tg。
Then, the intake noise SInto＝Sg-(Sb+K(Tg-Tb))-(Sf-(Sb+K(Tf-Tb)))。
The step B mainly comprises the following steps: free-rolling tire noise of a slick tire.
Step F mainly comprises: engine noise, driveline noise, free rolling tire noise of slick tires, and exhaust radiation noise.
The step G mainly comprises the following steps: engine noise, driveline noise, free rolling tire noise of slick tires, exhaust radiation noise, and intake noise.
T in step BbTemperature tire noise conversion to TgLower tire noise, increase of K (T)g-Tb) The noise of (2); t in step BbTemperature tire noise conversion to TfLower tire noise, increase of K (T)f-Tb) The noise of (2).
According to the above mentioned acoustic theory:
noise S of intake airInto＝10*lg(10Sg/10-10(Sb+K(Tg-Tb))/10-(10Sf/10-10(Sb+K(Tf-Tb))/10))。
Therefore, in the step, the influence of the road surface temperature on the calculation result of the tire noise can be eliminated, the air inlet noise can be accurately calculated, and the accuracy of the experiment is improved.
Preferably, as shown in fig. 1, the method for testing noise outside an automobile further includes an exhaust noise testing step:
an exhaust noise testing step, comprising:
executing the step G, specifically: the exhaust port of the automobile is silenced through a silencer, the shell of the exhaust system is not packaged or the package of the shell of the exhaust system is removed or the same shell of the exhaust system which is not packaged is replaced, the silencer on the air inlet is removed or the air inlet is not silenced, and the automobile uses a non-patterned smooth tire. Then, the automobile is normally accelerated, and the noise outside the automobile is tested to be SgAnd road surface temperature of Tg。
And H, executing the step: removing the silencer on the exhaust port, performing normal acceleration operation on the automobile, and testing the noise outside the automobile to be ShAnd road surface temperature of Th. The method specifically comprises the following steps: the silencer on the exhaust port is removed or the exhaust port is not silenced, the silencer on the air inlet is removed or the air inlet is not silenced, and the automobile uses the non-patterned smooth tire. Then, the automobile is normally accelerated, and the noise outside the automobile is tested to be SgAnd road surface temperature of Tg。
Then, exhaust noise SRow board＝Sh-(Sb+K(Th-Tb))-(Sg-(Sb+K(Tg-Tb)))。
The step B mainly comprises the following steps: free-rolling tire noise of a slick tire.
The step G mainly comprises the following steps: engine noise, driveline noise, free rolling tire noise of slick tires, exhaust radiation noise, and intake noise.
The step H mainly comprises the following steps: engine noise, driveline noise, free rolling tire noise of slick tires, exhaust radiation noise, intake noise, and exhaust noise.
T in step BbTemperature tire noise conversion to TgLower tire noise, increase of K (T)g-Tb) The noise of (2); t in step BbTemperature tire noise conversion to ThLower tire noise, increase of K (T)h-Tb) The noise of (2).
According to the above mentioned acoustic theory:
exhaust noise SRow board＝10*lg(10Sh/10-10(Sb+K(Th-Tb))/10-(10Sg/10-10(Sb+K(Tg-Tb))/10))。
Therefore, in the step, the influence of the road surface temperature on the calculation result of the tire noise can be eliminated, the exhaust noise can be accurately calculated, and the accuracy of the experiment is improved.
Preferably, as shown in fig. 1, the method for testing noise outside an automobile further includes a full noise testing step:
the full noise test step includes:
executing the step I: the automobile uses the original tire, does not muffle the air inlet and the exhaust outlet of the automobile, does not package the shell of the exhaust system, and operates the automobile normally with higher speed, and the noise outside the automobile is tested to be SiAnd road surface temperature of Ti。
The whole noise outside the automobile can be tested to carry out subsequent experimental tests.
Preferably, as shown in fig. 1, the method for testing noise outside of an automobile further includes a comparing and determining step.
The step of comparing and judging comprises the following steps:
and step J is executed: summing free-rolling tire noise, driveline noise, traction torque tire noise, engine noise, exhaust emission noise, intake noise, and exhaust noise to obtain SGeneral assembly。
And executing the step K: will SiAnd SGeneral assemblyComparison and judgment, e.g. SiAnd SGeneral assemblyIf the difference value is within the preset range, the test is judged to be qualified, if S isiAnd SGeneral assemblyIf the difference exceeds the preset range, the noise test is carried out on the automobile again.
The device can be connected with a computer, data is input into the computer, and automatic calculation and automatic experiment control are realized through the computer.
Preferably, as shown in fig. 1, the method for testing noise outside of an automobile further includes a step of comprehensive test judgment.
And a comprehensive test judgment step, wherein the execution sequence of the steps is as follows:
sequentially executing the step A, the step E, the step B, the step C, the step D, the step F, the step G, the step H, the step I, the step J and the step K.
By executing the steps in sequence, all data can be acquired in sequence after the steps are executed, and free rolling tire noise, transmission system noise, engine noise, traction torque tire noise, exhaust radiation noise, intake noise and exhaust noise can be calculated in sequence, so that the efficiency is improved.
In conclusion, the method for testing the noise outside the automobile can eliminate the influence of the road surface temperature on the calculation result, can separate the noise from the rolling tire and the traction torque tire, can identify each main sound source of the noise outside the automobile to the maximum extent, and improves the accuracy of the experimental result.
As shown in fig. 2 to 5, the muffler 5 connected to the intake port and the exhaust port is a full-band large muffler. As shown in fig. 5, the silencer 5 includes a housing 51, a glass wool layer 52 is provided in the housing 51, and a vent pipe 53 passes through the glass wool layer 52. An air duct inlet 531 of the air duct 53 extends from one side of the housing 51, and an air duct outlet 532 of the air duct 53 extends from the other side of the housing 51. The vent pipe 53 is provided with a plurality of through holes, gas enters the vent pipe 53 through the gas pipe inlet 531, when passing through the glass fiber cotton layer 52, the gas enters the glass fiber cotton layer 52 through the through holes for silencing, and the silenced gas returns to the vent pipe 53 and is finally discharged through the gas pipe outlet 532.
The trachea gas outlet 532 of muffler 5 can be connected and carry out the amortization to the air inlet on the air inlet, and the trachea gas inlet 531 of muffler 5 can be installed and carry out the amortization to the gas vent on the gas vent, can also install muffler 5 simultaneously and carry out the amortization to air inlet and gas vent on air inlet and gas vent.
As shown in fig. 2, when the intake port is muffled:
description of the intake connection muffler 5:
the method comprises the following steps: the dirty side, the air cleaner and the clean side of the whole air intake system are all removed, and the air intake connecting pipe 1 is connected with the throttle valve of the engine. Specifically, the intake connecting pipe 1 has a mounting hole, and the air flow sensor is mounted in the mounting hole of the intake connecting pipe 1.
Step two: fixing the air inlet connecting pipe 1 and a long section of high-temperature-resistant PVC steel wire hose 2 by using a hoop to prevent air leakage; .
Step three: connect PVC steel wire hose 2 and air cleaner 3, both use the clamp to fix, prevent that the air from revealing. The air cleaner 3 is installed to prevent external dust and foreign substances from entering the engine, resulting in damage to the engine.
Step four: connect air cleaner 3 and one section shorter high temperature resistance PVC steel wire hose 4, both use the clamp to fix, prevent that the air from revealing.
Step five: connect PVC steel wire hose 4 and muffler 5, both use the clamp to fix, prevent that the air from revealing. The purpose of the silencer 5 is to shield the inlet noise.
Step six: after the whole air inlet noise shielding system is installed, for a truck, the whole system can be hoisted at the front end of the truck by using a rope, and external protrusions such as a rearview mirror and the like can be considered at a specific hoisting position; for passenger vehicles, the entire system can be placed on top of the car or above the trunk, secured using the ropes and corresponding locations on the bottom of the vehicle.
As shown in fig. 3-4, when muffling the exhaust port:
description of exhaust port connection muffler 5:
step 1: the exhaust connecting pipe 6 is connected with the exhaust port, three fastening bolts are arranged on the exhaust connecting pipe 6, and the exhaust connecting pipe is arranged on the exhaust outlet through the fastening bolts. The gap between the exhaust connection pipe 6 and the exhaust pipe is sealed with a heat-resistant solid glue.
Step 2: connect exhaust connecting pipe 6 and flexible metal flexible pipe 7, both use the flange to fix, and the installation gasket prevents that the exhaust from revealing between the flange.
And step 3: the metal flexible pipe 7 and the muffler 5 are connected and fixed by a flange to prevent exhaust gas leakage. The muffler 5 is installed to shield exhaust port noise.
And 4, step 4: the casing of the above-described whole exhaust noise shielding system (the inside of the casing including the exhaust connection pipe 6, the metal flexible pipe 7 and the muffler 5) is externally coated with a heat-resistant sound-absorbing material (e.g., glass fiber) and a sound-insulating material (e.g., soundproof aluminum foil).
And 5: after the whole exhaust noise shielding system is installed, the whole system can be placed in a container and fixed for a truck; for passenger vehicles, the entire system can be placed on top of the car or above the trunk, secured using the ropes and corresponding locations on the bottom of the vehicle.
According to the needs, the above technical schemes can be combined to achieve the best technical effect.
The foregoing is considered as illustrative only of the principles and preferred embodiments of the invention. It should be noted that, for those skilled in the art, several other modifications can be made on the basis of the principle of the present invention, and the protection scope of the present invention should be regarded.

Claims (9)

1. A method for testing noise outside an automobile is characterized by comprising the following steps:
a free rolling tire noise testing step comprising:
and B, executing the step A: silencing an air inlet and an air outlet of an automobile through a silencer, packaging a shell of an exhaust system, extinguishing the automobile by using an original automobile tire and performing neutral sliding operation on the automobile, and testing the noise outside the automobile to be SaAnd road surface temperature of Ta；
Then, free rolling tire noise STire roller＝Sa+K(T0-Ta) Wherein T is0Taking the temperature as a reference temperature, and K is a tire noise temperature conversion coefficient;
a transmission system noise testing step, namely calculating the transmission system noise;
an engine noise testing step, namely calculating the noise of the engine;
a traction torque tire noise testing step, namely calculating the traction torque tire noise;
an exhaust radiation noise test step, calculating exhaust radiation noise;
an air inlet noise testing step, namely calculating air inlet noise;
an exhaust noise test step of calculating exhaust noise;
a full noise test step for testing the noise outside the vehicle to be SiAnd road surface temperature of Ti；
The step of comparing and judging comprises the following steps:
and step J is executed: summing the free-rolling tire noise, the driveline noise, the traction torque tire noise, the engine noise, the exhaust emission noise, the intake noise, and the exhaust noise to obtain SGeneral assembly；
And executing the step K: will SiAnd SGeneral assemblyComparison and judgment, e.g. SiAnd SGeneral assemblyIf the difference value is within the preset range, the test is judged to be qualified, if S isiAnd SGeneral assemblyIf the difference exceeds the preset range, the noise test is carried out on the automobile again.
2. The method for testing noise outside a vehicle of claim 1,
the drive train noise testing step comprises:
and B, executing the step B: silencing an air inlet and an air outlet of an automobile through a silencer, packaging a shell of an exhaust system, extinguishing the automobile by using a non-pattern smooth tire and performing neutral sliding operation on the automobile, and testing the noise outside the automobile to be SbAnd road surface temperature of Tb；
And C, executing the step C: carrying out three-gear flameout and sliding operation on the automobile, and testing the noise outside the automobile to be ScAnd road surface temperature of Tc；
Then, the power train noise SConveying appliance＝Sc-(Sb+K(Tc-Tb))。
3. The method for testing noise outside a vehicle of claim 2, wherein the engine noise testing step comprises:
executing the step C;
and D, executing the step D: normal acceleration operation is carried out on the automobile, and the noise outside the automobile is tested to be SdAnd road surface temperature of Td；
Then, engine noise SHair-like device＝Sd-(Sb+K(Td-Tb))-SConveying appliance。
4. The method for testing noise outside an automobile according to claim 3,
the traction torque tire noise testing step comprises the following steps:
executing the step A;
and E, executing the step E: carrying out normal acceleration running operation on the automobile, and testing the noise outside the automobile to be SeAnd road surface temperature of Te；
Executing the step B;
executing the step D: normal acceleration operation is carried out on the automobile, and the noise outside the automobile is tested to be SdAnd road surface temperature of Td；
Then, traction torque tire noise STire twist＝Se-(Sa+K(Te-Ta))-(Sd-(Sb+K(Td-Tb)))+K(T0-Te)。
5. The method for testing noise outside an automobile according to claim 4,
the exhaust radiation noise testing step includes:
performing the step D;
and F, executing: removing the package on the shell of the exhaust system, carrying out normal acceleration operation on the automobile, and testing the noise outside the automobile to be SfAnd road surface temperature of Tf；
Then, the exhaust radiation noise SSpoke＝Sf-(Sb+K(Tf-Tb))-(Sd-(Sb+K(Td-Tb)))。
6. The method for testing noise outside an automobile according to claim 5,
the intake noise testing step includes:
performing the step F;
and G, executing: removing the silencer on the air inlet, carrying out normal acceleration operation on the automobile, and testing the noise outside the automobile to be SgAnd road surface temperature of Tg；
Then, the intake noise SInto＝Sg-(Sb+K(Tg-Tb))-(Sf-(Sb+K(Tf-Tb)))。
7. The method for testing noise outside a vehicle of claim 6, wherein the step of testing exhaust noise comprises:
executing the step G;
and H, executing the step: removing the silencer on the exhaust port, performing normal acceleration operation on the automobile, and measuringThe noise outside the test run is ShAnd road surface temperature of Th；
Then, exhaust noise SRow board＝Sh-(Sb+K(Th-Tb))-(Sg-(Sb+K(Tg-Tb)))。
8. The method for testing noise outside a vehicle of claim 7, wherein the full noise testing step comprises:
executing the step I: the automobile uses the original tire, does not carry out the amortization to the air inlet and the gas vent of automobile, does not carry out the package to the casing of exhaust amortization system simultaneously, carries out normal acceleration operation to the automobile.
9. The method for testing the noise outside the automobile according to claim 8, further comprising the steps of:
and a comprehensive test judgment step, wherein the execution sequence of the steps is as follows:
executing the step A;
performing the step E;
executing the step B;
executing the step C;
performing the step D;
performing the step F;
executing the step G;
performing the step H;
performing the step I;
performing the step J;
and executing the step K.
CN201811190832.9A 2018-10-12 2018-10-12 Method for testing noise outside automobile Active CN109443793B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811190832.9A CN109443793B (en) 2018-10-12 2018-10-12 Method for testing noise outside automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811190832.9A CN109443793B (en) 2018-10-12 2018-10-12 Method for testing noise outside automobile

Publications (2)

Publication Number Publication Date
CN109443793A CN109443793A (en) 2019-03-08
CN109443793B true CN109443793B (en) 2021-04-09

Family

ID=65545250

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811190832.9A Active CN109443793B (en) 2018-10-12 2018-10-12 Method for testing noise outside automobile

Country Status (1)

Country Link
CN (1) CN109443793B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019164106A (en) * 2018-03-20 2019-09-26 本田技研工業株式会社 Abnormal noise detection device and detection metho
CN109916506B (en) * 2019-04-18 2020-12-18 中国第一汽车股份有限公司 Commercial vehicle passing noise rapid measurement system and measurement method
CN110672336A (en) * 2019-09-20 2020-01-10 中国第一汽车股份有限公司 Abnormal sound testing method, device, equipment and storage medium for vehicle
CN114878183A (en) * 2022-04-29 2022-08-09 东风汽车集团股份有限公司 Method and system for determining sound insulation contribution degree of whole vehicle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1087214A3 (en) * 1999-09-27 2008-04-23 Ford Global Technologies, Inc. Method and system to detect unwanted noise
US7421321B2 (en) * 1995-06-07 2008-09-02 Automotive Technologies International, Inc. System for obtaining vehicular information
WO2014202286A1 (en) * 2013-06-21 2014-12-24 Brüel & Kjær Sound & Vibration Measurement A/S Method of determining noise sound contributions of noise sources of a motorized vehicle
CN106382143A (en) * 2016-12-01 2017-02-08 吉林大学 Active noise reduction device and active noise reduction method based on engine speed
CN107525680A (en) * 2016-06-17 2017-12-29 通用汽车环球科技运作有限责任公司 The method for identifying the trouble unit in automotive system
CN108362508A (en) * 2018-04-12 2018-08-03 汪林 Auto NVH detection device, method and automobile remaining life appraisal procedure

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007210475A (en) * 2006-02-09 2007-08-23 Bridgestone Corp Method for predicting performance of tire, method for simulating performance of tire, and recording medium having program for predicting performance of tire
CN201317323Y (en) * 2008-12-12 2009-09-30 东风汽车有限公司 Multi-channel active noise control device for commercial vehicle cab
CN101806660A (en) * 2009-02-18 2010-08-18 中国第一汽车集团公司 Method for simulating noise radiation and decomposing noise sources when automobile speeds up
KR101146090B1 (en) * 2009-12-10 2012-05-11 한국타이어 주식회사 Pass-by noise measurement system
CN103362598B (en) * 2013-07-24 2015-04-22 安徽江淮汽车股份有限公司 Method for separating noise sources of automobile
CN104237116B (en) * 2014-09-12 2017-01-18 东南大学 system and method for testing tire/road noise
CN105716708B (en) * 2016-01-29 2019-02-19 安徽江淮汽车集团股份有限公司 A kind of noise source separation method of at the uniform velocity noise
CN206440464U (en) * 2016-11-17 2017-08-25 上汽通用汽车有限公司 Vehicle noise source separate metering system
CN106840710B (en) * 2017-01-24 2023-09-05 易瑞博科技（北京）有限公司 Tire noise testing device and tire noise data acquisition system
CN108195599A (en) * 2018-02-12 2018-06-22 王灿灿 A kind of automobile vibration experimental rig
CN108318130B (en) * 2018-04-08 2023-10-20 厦门金龙联合汽车工业有限公司 Noise source identification method for accelerating out-of-vehicle noise test

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7421321B2 (en) * 1995-06-07 2008-09-02 Automotive Technologies International, Inc. System for obtaining vehicular information
EP1087214A3 (en) * 1999-09-27 2008-04-23 Ford Global Technologies, Inc. Method and system to detect unwanted noise
WO2014202286A1 (en) * 2013-06-21 2014-12-24 Brüel & Kjær Sound & Vibration Measurement A/S Method of determining noise sound contributions of noise sources of a motorized vehicle
CN107525680A (en) * 2016-06-17 2017-12-29 通用汽车环球科技运作有限责任公司 The method for identifying the trouble unit in automotive system
CN106382143A (en) * 2016-12-01 2017-02-08 吉林大学 Active noise reduction device and active noise reduction method based on engine speed
CN108362508A (en) * 2018-04-12 2018-08-03 汪林 Auto NVH detection device, method and automobile remaining life appraisal procedure

Also Published As

Publication number Publication date
CN109443793A (en) 2019-03-08

Similar Documents

Publication Publication Date Title
CN109443793B (en) Method for testing noise outside automobile
US8567238B2 (en) Method for determining the rotation speed of a supercharger in an internal combustion engine
CN110400558B (en) Noise detection and noise reduction method for vehicle fuel cell engine system
CN103362598A (en) Method for separating noise sources of automobile
US6354398B1 (en) Mufflers for use with engine retarders; and methods
US3695098A (en) Method and apparatus for isolating and measuring vehicle noise
US8676534B2 (en) Method for determining the rotation speed of a supercharger in an internal combustion engine
JP5734671B2 (en) Tire noise test method
US20010021258A1 (en) Device and method for the reduction of sound emissions in and diagnosis of internal combustion engines
CN109141519A (en) A kind of testboard bay tested for silencer element acoustics and flow field characteristic
CN108318130B (en) Noise source identification method for accelerating out-of-vehicle noise test
KR980010402A (en) Measuring device for transmission loss of automobile silencer
CN203044466U (en) Production workshop air discharging device with silencer
CN107255056A (en) A kind of exhausting silencer structure of automobile relief valve
US7527125B2 (en) Muffler for an exhaust system
CN210489235U (en) Noise detection and noise reduction system for vehicle fuel cell engine system
CN205654412U (en) Turbosupercharged engine exhaust system's improvement structure
RU2004129040A (en) INTEGRATED AIR PREPARATION DEVICE FOR GAS TURBINE INSTALLATION
RU2292537C2 (en) Method to determine noise radiated by mufflers of automobile engines
CN203067068U (en) High exhaust pipe for forklift
CN211116270U (en) Portable automobile engine cabin noise monitoring silencing device
CN205654394U (en) Control and device of differentiateing exhaust system noise
Karthik et al. Design and fabrication of muffler using natural fiber
Liu et al. Noise control of an 11,000 horsepower single stage pipeline centrifugal compressor
US20130312493A1 (en) Engine ventilation system diagnostics using pressure measurement

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant