CN105297576A - Vehicle interior noise testing road surface, laying method of vehicle interior noise testing road surface, and vehicle interior noise testing method - Google Patents
Vehicle interior noise testing road surface, laying method of vehicle interior noise testing road surface, and vehicle interior noise testing method Download PDFInfo
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Abstract
The invention provides a vehicle interior noise testing road surface, a laying method of the vehicle interior noise testing road surface and a vehicle interior noise testing method. The vehicle interior noise testing road surface comprises a surface layer of which the thickness is 120mm, wherein the surface layer comprises stone materials mixed at a weight ratio of 1:1; the particle sizes of the stone materials are 10mm and 15mm respectively; and gaps between the stone materials are filled with modified asphalt. According to the invention, road surface parameters of a rough road surface are designed and determined; the testing road surface is added and perfected; through a test of vehicle interior noise on the rough road surface, a testing and evaluation scheme is provided for vehicle interior noise reduction; the NVH (Noise Vibration and Harshness) level of a finished automobile is raised; and the product performance is more competitive.
Description
Technical field
The present invention relates to automotive field, particularly relate to a kind of internal car noise test road surface and laying method, internal car noise method of testing.
Background technology
Vehicle Interior Noise generally affects comparatively large by the roughness of road surface structure, and automobile travels on the road that roughness is different with identical speed, and internal car noise and speech intelligibility are all different.When automobile with medium speed in motion, usual internal car noise is mainly made an uproar from tire and wind, if when travelling on comparatively coarse cement road, except tire is made an uproar and wind makes an uproar, also has the low-frequency noise produced car load excitation from road surface.The problem that most of automobile has low-frequency noise large, in order to better study this problem, in auto NVH (Noise, Vibration, Harshness, noise, vibration and comfortableness) development process, it is that one compares effective method that coarse road is carried out test analysis.
Inside current each large proving ground except performance road, other road surfaces are all not suitable for carrying out automobile noise test, as comparatively large in pavement strengths such as Billy's time channel, washboard road and resonance roads, be mainly used to test vehicle durability, well can not test out the noise level of vehicle; And performance road is more smooth, is applicable to carrying out wind and makes an uproar and accelerate internal car noise test, but can not fully encourage low-frequency noise in cycling start.Therefore, in order to study internal car noise comprehensively, need the design road surface of roughness between smooth road and durable road, to carry out internal car noise test on this basis.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of internal car noise to test road surface and laying method, internal car noise method of testing, is convenient to low-frequency noise in test carriage.
In order to solve the problems of the technologies described above, the invention provides a kind of internal car noise test road surface, comprise the surface layer that thickness is 120 millimeters, described surface layer comprises that 1:1 ratio by weight mixes, that particle diameter is respectively 10 millimeters and 15 millimeters building stones, is filled with modified bitumen between described building stones.
Wherein, the void content of described surface layer is 4.0%, and construction depth is 4.8 millimeters.
Wherein, described test road surfacing width is 3 meters, and laying length is 180 ~ 200 meters.
The embodiment of the present invention also provides a kind of internal car noise to test the laying method on road surface, comprising:
Step S31, adopts heavy road roller compacting soil matrix;
Step S32, soil matrix lays granular sub-base;
Step S33, granular sub-base is laid cement stabilizing layer;
Step S34, a coating emulsified asphalt sticking layer oil that cement stabilizing layer is splashed;
Step S35, asphalt macadam-aggregate mix layer;
Step S36, on described bituminous concrete moxture layer, is respectively the building stones of 10 millimeters and 15 millimeters by weight the mixing of 1:1 ratio by particle diameter, and between described building stones filling-modified pitch, form the surface layer that thickness is 120 millimeters.
Wherein, the void content of described surface layer is 4.0%, and construction depth is 4.8 millimeters.
Wherein, described test road surfacing width is 3 meters, and laying length is 180 ~ 200 meters.
The embodiment of the present invention also provides a kind of internal car noise method of testing, comprising:
Step S41, provide a kind of internal car noise to test road surface, described road surface comprises the surface layer that thickness is 120 millimeters, and described surface layer comprises that 1:1 ratio by weight mixes, that particle diameter is respectively 10 millimeters and 15 millimeters building stones, is filled with modified bitumen between building stones;
Step S42, carries out test and prepares;
Step S43, at the uniform velocity travels testing vehicle with the speed of 60km/h on described test road surface;
Step S44, gathers internal car noise data and to go forward side by side row relax.
Wherein, the void content of described surface layer is 4.0%, and construction depth is 4.8 millimeters.
Wherein, described test road surfacing width is 3 meters, and laying length is 180 ~ 200 meters.
Wherein, in described step S43, the gear of described testing vehicle selects the most high-grade of energy steady operation.
The beneficial effect that enforcement the present invention brings is: the present invention designs and determines the road surface parameter of rough road, increase and perfect test road surface, by testing internal car noise on coarse road, a kind of test and evaluation of programme is provided for reducing internal car noise, improve car load NVH level, make properties of product more competitive.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the cross section structure schematic diagram on the embodiment of the present invention one one kinds of internal car noise test road surfaces.
Fig. 2 is the another cross section structure schematic diagram on the embodiment of the present invention one one kinds of internal car noise test road surfaces.
Fig. 3 is the schematic flow sheet of the laying method on the embodiment of the present invention 21 kinds of internal car noise test road surfaces.
Fig. 4 is the schematic flow sheet of the embodiment of the present invention 31 kinds of internal car noise method of testings.
Fig. 5 is point position schematic diagram in the embodiment of the present invention three.
Detailed description of the invention
Below with reference to the accompanying drawings the preferred embodiments of the present invention are described.
Please refer to shown in Fig. 1, the embodiment of the present invention one provides a kind of internal car noise to test road surface, comprise the surface layer 1 that thickness is 120 millimeters, this surface layer comprises that 1:1 ratio by weight mixes, that particle diameter is respectively 10 millimeters and 15 millimeters building stones 11,12, is filled with modified bitumen 13 between building stones.Particularly, the particle diameter of building stones 11 is 10 millimeters, and the particle diameter of building stones 12 is 15 millimeters, and building stones 11 are 1:1 with the weight ratio of building stones 12.
The void content of this surface layer 1 is 4.0%, and construction depth is 4.8 millimeters.In addition, consider and lay cost and test facility, the test road surfacing width of the present embodiment is 3 meters, and laying length is 180 ~ 200 meters, preferably 200 meters.
The constituent of internal car noise and the pass of the speed of a motor vehicle are: low speed main contributions, from power assembly, is mainly made an uproar from tire during medium speed, wind made an uproar and body structure low-frequency noise, and during high speed, mainly tire is made an uproar and wind is made an uproar.Because vehicle at the uniform velocity noise testing standard in GB18697-2002(car, it is a national standard being used for measuring when specification passenger car at the uniform velocity travels internal car noise specially, the method of internal car noise is measured when this standard specifies that vehicle at the uniform velocity travels in smooth road with the different speed of a motor vehicle, content comprises test condition, measuring point, measurement condition, measuring process and data processing method etc.) when the smooth road that specifies travels with the medium speed of a motor vehicle, can not well encourage low-frequency noise in cycling start, the internal car noise test road surface that the present embodiment provides, have employed the building stones being respectively 10 millimeters and 15 millimeters by particle diameter at the textural of surface layer, by weight the mixing of 1:1 ratio, thus formed so-called " rough road ", its roughness is between smooth road and durable road.When vehicle at the uniform velocity travels with the medium speed of a motor vehicle (such as 60km/h) in this rough road, the construct noise within low-frequency noise in car, particularly 200Hz just in time can be evoked.By testing the internal car noise under this rough road, the structural frequency response in conjunction with vehicle chassis is analyzed, and can well determine noise source, and instructs and inspection for rectification scheme provides.
As can be seen here, the present invention increases and perfect test road surface, by testing internal car noise on test road surface construct by the present embodiment, providing a kind of and tests and evaluation of programme, improve car load NVH level, making properties of product more competitive for reducing internal car noise.
Compare with other test road surfaces existing, the test road base of the present embodiment to improve as the superiors of road structure surface layer 1(its directly bear the vertical force of traffic load, horizontal force and vehicle body after the repeated action of pull of vacuum that produces, be subject to rainfall and temperature variable effect simultaneously) structure, as an example, please refer to shown in Fig. 2, the test road surface of the present embodiment also comprises from bottom to top successively:
Soil matrix 2, by heavy standard compaction, degree of compaction >=95%;
Subbase 3, is made up of the thick rubble of particle diameter at 5-15 centimetre, and the thickness of subbase is 60 centimetres;
Be arranged on the geo-grid 4 at subbase top, in length and breadth tensile strength > 10KN/m;
Cement stabilizing layer, comprises lower stabilized zone 51 and upper stabilized zone 52 further, and lower stabilized zone 51 thickness is 30 centimetres, and cement factor is 4%, and upper stabilized zone 52 thickness is 20 centimetres, and cement factor is 6%;
Emulsification pitch penetration 6, Asphalt emulsion content is 0.7 ~ 1.1kg/m
2;
Bituminous concrete moxture layer 7, thickness is 9 millimeters.
Wherein, surface layer 1 is arranged on bituminous concrete moxture layer 7.
Shown in Fig. 3, the embodiment of the present invention two provides a kind of internal car noise to test the laying method on road surface, comprising:
Step S31, adopts heavy road roller compacting soil matrix;
Step S32, soil matrix lays granular sub-base;
Step S33, granular sub-base is laid cement stabilizing layer;
Step S34, a coating emulsified asphalt sticking layer oil that cement stabilizing layer is splashed;
Step S35, asphalt macadam-aggregate mix layer;
Step S36, on bituminous concrete moxture layer, is respectively the building stones of 10 millimeters and 15 millimeters by weight the mixing of 1:1 ratio by particle diameter, and between building stones filling-modified pitch, form the surface layer that thickness is 120 millimeters.
The void content of this surface layer is 4.0%, and construction depth is 4.8 millimeters.In addition, consider and lay cost and test facility, the test road surfacing width of the present embodiment is 3 meters, and laying length is 180 ~ 200 meters, preferably 200 meters.
It should be noted that, in the laying method of the present embodiment, step S31-S35 is all as good as with existing road surfacing method, comprises common such as detection level degree, degree of compaction, shakeouts, and detects the operation such as thickness, intensity, repeats no more herein.The laying of what the present embodiment improved is surface layer, particle diameter is respectively the building stones of 10 millimeters and 15 millimeters, by weight the mixing of 1:1 ratio, thus formed so-called " rough road ", its roughness is between smooth road and durable road.When vehicle at the uniform velocity travels with the medium speed of a motor vehicle (such as 60km/h) in this rough road, the construct noise within low-frequency noise in car, particularly 200Hz just in time can be evoked.By testing the internal car noise under this rough road, the structural frequency response in conjunction with vehicle chassis is analyzed, and can well determine noise source, and instructs and inspection for rectification scheme provides.
Again as shown in Figure 4, the embodiment of the present invention three provides a kind of internal car noise method of testing, comprising:
Step S41, provide a kind of internal car noise to test road surface, this road surface comprises the surface layer that thickness is 120 millimeters, and this surface layer comprises that 1:1 ratio by weight mixes, that particle diameter is respectively 10 millimeters and 15 millimeters building stones, is filled with modified bitumen between building stones;
Step S42, carries out test and prepares;
Step S43, at the uniform velocity travels testing vehicle with the speed of 60km/h on test road surface;
Step S44, gathers internal car noise data and to go forward side by side row relax.
In step S41, the void content of surface layer is 4.0%, and construction depth is 4.8 millimeters.In addition, consider and lay cost and test facility, the test road surfacing width of the present embodiment is 3 meters, and laying length is 180 ~ 200 meters, preferably 200 meters.
Step S42 is then similar to existing method of testing, relates generally to test condition and testing vehicle confirmation, testing equipment preparation and installation etc., illustrates as follows:
(1) confirm that meteorological condition is good, without bad weathers such as rain, snow, hails, earth's surface above 1.2m height wind speed peak value is not more than 5m/s, the not super many 3m/s of mean wind speed in 10s, and environment temperature is at-5 DEG C ~ 38 DEG C;
(2) confirm that background noise meets test request, the noise be made up of background noise and tester internal sound at least should be less than tested sound 10dB (A);
(3) exact p-value vehicle meets entire vehicle design requirement, bodywork surface is clean and tidy, without other foreign matters, spare tyre, driver's tool are fixed, testing vehicle all liq medium comprises cooling fluid, brake fluid, lubrication oil, power steering fluid are annotated by designing requirement, fuel filling is to mailbox volume more than 1/4, and vehicle is break-in 1500km at least;
(4) all service conditions of motor, as fuel, lubrication oil, ignition timing or injection time etc. all should meet current car load technical condition, motor should be stabilized in normal operating temperature range (about 90 DEG C);
(5) tire pressure must meet car load technical condition, and tire should be comparatively new, and decorative pattern is not without noticeable wear (particularly have eccentric wear);
(6) primary condition of car load should meet the regulation of 4.4 in GB/T3730.2-1996 or 4.6, in car except driver, tester and testing equipment, does not sit other staff or does not place other article.Opening, as skylight, all vehicle windows, air-conditioning inner-outer circulation mouth, all must shut; Servicing unit, as wiper, heater, fan and air-conditioning etc., must not work in measurement process of the test; Adjustable seat should be adjusted to design point;
(7) installation testing equipment, testing equipment quantity and parameter specification must not lower than following tables:
(8) measuring point is selected: as shown in Figure 5, and in the drawings 1. ~ 8. position arranged by microphone, wherein front-seat from operator seat arrange from left to right measuring point 1. ~ 4., rear row arrange from left to right measuring point 5. ~ 8., at least to arrange 2., 7. two measuring points;
(9) software parameter is arranged, and select CPB analysis mode, frequency analysis scope is 20Hz-10kHz, and average mode is linear, time 10s;
(10) microphone is calibrated.
Because step S41 provides a kind of novel test road surface, roughness is between smooth road and durable road, when vehicle at the uniform velocity travels with the medium speed of a motor vehicle (such as 60km/h) in this rough road, just in time can evoke low-frequency noise in car, construct noise particularly within 200Hz, therefore, in step S43, testing vehicle is at the uniform velocity travelled with the speed of 60km/h on test road surface, the internal car noise test of the present embodiment under rough road can be realized.Structural frequency response in conjunction with vehicle chassis is analyzed, and can well determine noise source, and instructs and inspection for rectification scheme provides.In order to reduce engine noise to the impact of internal car noise as far as possible, gear selects the most high-grade of energy steady operation.
The same with step S42, step S44 is also similar to existing method of testing, and only brief description is as follows herein:
(1) for ensureing certainty of measurement, before formal image data, the automatic gain function of data collecting system should be utilized to adjust the range ability of each passage, making signal scale be in about 3/4 of full scale scale;
(2) (the conformance definition: sound pressure level total value and spectrum curve difference are no more than 2dB (A) of three groups of good data of uniformity is recorded;
(3) again check the uniformity of data, the one group of data choosing horizontal center in three secondary data process, and record corresponding sound pressure level and lamprophonia degrees of data.
Known by above-mentioned explanation, the present invention designs and determines the road surface parameter of rough road, increases and perfect test road surface, by testing internal car noise on coarse road, thering is provided a kind of test and evaluation of programme for reducing internal car noise, improve car load NVH level, making properties of product more competitive.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (10)
1. an internal car noise test road surface, is characterized in that, comprise the surface layer that thickness is 120 millimeters, and described surface layer comprises that 1:1 ratio by weight mixes, that particle diameter is respectively 10 millimeters and 15 millimeters building stones, is filled with modified bitumen between described building stones.
2. internal car noise test road surface according to claim 1, it is characterized in that, the void content of described surface layer is 4.0%, and construction depth is 4.8 millimeters.
3. internal car noise test road surface according to claim 1, it is characterized in that, described test road surfacing width is 3 meters, and laying length is 180 ~ 200 meters.
4. the laying method on internal car noise test road surface, comprising:
Step S31, adopts heavy road roller compacting soil matrix;
Step S32, soil matrix lays granular sub-base;
Step S33, granular sub-base is laid cement stabilizing layer;
Step S34, a coating emulsified asphalt sticking layer oil that cement stabilizing layer is splashed;
Step S35, asphalt macadam-aggregate mix layer;
Step S36, on described bituminous concrete moxture layer, is respectively the building stones of 10 millimeters and 15 millimeters by weight the mixing of 1:1 ratio by particle diameter, and between described building stones filling-modified pitch, form the surface layer that thickness is 120 millimeters.
5. laying method according to claim 4, is characterized in that, the void content of described surface layer is 4.0%, and construction depth is 4.8 millimeters.
6. laying method according to claim 4, is characterized in that, described test road surfacing width is 3 meters, and laying length is 180 ~ 200 meters.
7. an internal car noise method of testing, comprising:
Step S41, provide a kind of internal car noise to test road surface, described road surface comprises the surface layer that thickness is 120 millimeters, and described surface layer comprises that 1:1 ratio by weight mixes, that particle diameter is respectively 10 millimeters and 15 millimeters building stones, is filled with modified bitumen between building stones;
Step S42, carries out test and prepares;
Step S43, at the uniform velocity travels testing vehicle with the speed of 60km/h on described test road surface;
Step S44, gathers internal car noise data and to go forward side by side row relax.
8. method of testing according to claim 7, is characterized in that, the void content of described surface layer is 4.0%, and construction depth is 4.8 millimeters.
9. method of testing according to claim 7, is characterized in that, described test road surfacing width is 3 meters, and laying length is 180 ~ 200 meters.
10. method of testing according to claim 7, is characterized in that, in described step S43, the gear of described testing vehicle selects the most high-grade of energy steady operation.
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| CN110243463A (en) * | 2019-07-04 | 2019-09-17 | 上汽通用五菱汽车股份有限公司 | A kind of adjustable road noise of the gradient tests the test method of road surface and internal car noise |
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