CN102998124A - NVH (noise, vibration and harshness) semi-anechoic room test system and method - Google Patents
NVH (noise, vibration and harshness) semi-anechoic room test system and method Download PDFInfo
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- CN102998124A CN102998124A CN2011102656505A CN201110265650A CN102998124A CN 102998124 A CN102998124 A CN 102998124A CN 2011102656505 A CN2011102656505 A CN 2011102656505A CN 201110265650 A CN201110265650 A CN 201110265650A CN 102998124 A CN102998124 A CN 102998124A
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Abstract
The invention discloses NVH (noise, vibration and harshness) semi-anechoic room test system and method. The NVH semi-anechoic room test system comprises an anechoic room, a dynamometer chamber, a sound arrester and a sound-proof wall. The anechoic room is used for containing a device to be tested. A test bench base is arranged in the anechoic room, and the device to be tested is fixed on the test bench base. Elastic dampers are disposed between the test bench base and the base floor in the anechoic room. The dynamometer chamber is used for containing a test device. The test device comprises a dynamometer. The dynamometer chamber is provided with a dynamometer bottom plate. The test device is fixed on the dynamometer bottom plate. Elastic dampers are disposed between the dynamometer bottom plate and the base floor in the dynamometer chamber. The sound arrester encloses the device to be tested so as to spatially isolate the anechoic room and the dynamometer chamber and isolate sound. The soundproof wall is provided with a plurality of connecting shafts which penetrate through the soundproof wall in soundproof manner and are used for connecting the test device and the device to be tested for testing. The NVH semi-anechoic room test system can meet the multi-mode test needs and is effective in sound proofing and accurate in test data.
Description
Technical field
The present invention relates to vehicle NVH test, relate in particular to a kind of NVH semianechoic room test macro and a kind of NVH semianechoic room method of testing.
Background technology
Along with the day by day fierce and market of automobile market competition to becoming more diverse that automobile product requires, NVH (noise noise, vibration Vibration and ride comfort Harshness) tested also having proposed challenge.Statistical data shows, it is relevant with the NVH problem of vehicle that car load approximately has 1/3 failure problems, and the R ﹠ D Cost consumption of each major company nearly 20% is on the NVH problem that solves vehicle.The development of NVH research presents following features:
1. complete test capability will be the assurance that product NVH performance improves;
2. be applied in the car load design process, basically carry out synchronously with whole performance history;
3. computer simulation technique is in the widespread use of NVH research field;
4.NVH research category further enlarges, and comprises the contents such as the Design of Auto Parts and intensity and fail-safe analysis.
Yet traditional power assembly testing laboratory can only carry out the independent noise testing of engine, can not satisfy simultaneously the needs of combined tests such as carrying out wheel box, engine and wheel box, vehicle bridge and wheel box and multi-mode test.And, the measurement of power of the testing apparatus of traditional power assembly testing laboratory or electric system and separately tested engine or wheel box etc. do not carry out isolation on the space, although or separate and do not take between two rooms that testing apparatus and tested equipment are set effectively to insulate against sound and noise countermeasure.Exist measurement of power or electric system to be radiated the larger problem of power assembly test bay noise.Along with the needs of power assembly noise research, in order not affect the needs of engine, wheel box, power assembly (engine, wheel box and back axle) noise testing, power assembly testing laboratory should carry out acoustical insulation sound-deadening.
A kind of semianechoic room test macro of prior art as shown in Figure 1, as shown in Figure 1, just the simple body of wall 4 of using is separated testing apparatus (for example dynamometer machine 6) and tested equipment (for example independent engine and wheel box) and sound insulation, and wedge deadener 41 is set to carry out the noise elimination of tested equipment one side in tested equipment one side.Testing apparatus and tested equipment are connected to the two axial ends 52,56 of coupling shaft 5.
Testing apparatus is connected in dynamometer machine base plate 7, and dynamometer machine base plate 7 comprises iron plate 71 and cement layer 72, is provided with elastic damping 70 between dynamometer machine base plate 7 and the foundation ground 9.The bottom of the bracing or strutting arrangement 51 of the axle head 52 of coupling shaft 5 also is connected in dynamometer machine base plate 7.Tested equipment connection is in testboard bay basis 8, and testboard bay basis 8 also comprises iron plate 81 and cement layer 82, is provided with elastic damping 80 between testboard bay basis 8 and the foundation ground 9.The bottom of the bracing or strutting arrangement 57 of the axle head 56 of coupling shaft 5 also is connected in testboard bay basis 8.
Traditional power assembly testing laboratory is except the independent noise testing that can only carry out engine etc., its wedge muffled mode also has a lot of shortcomings, such as: wedge deadener 41 easily aging, the distortion anti-impact force is poor, behind the absorption oil smoke, dust, the certain time limit of use (such as 7 years) be stained with namely that greasy dirt can't clean, Acceptable life is short, to the deficiency of low-frequency signal processing etc., and as shown in Figure 1, the length of wedge deadener 41 is longer, generally about 1.2 meters, therefore take a large amount of spaces, reduced the space availability ratio in power assembly laboratory.
Summary of the invention
For problems of the prior art, a kind of acoustical insulation sound-deadening that can satisfy simultaneously the multi-modes such as noise such as carrying out wheel box, engine and wheel box, vehicle bridge and wheel box tests needs is effective in order to provide for purpose of the present invention, test data NVH semianechoic room test macro accurately.
Another object of the present invention is to provide a kind of NVH semianechoic room method of testing.
For achieving the above object, technical scheme of the present invention is as follows:
. a kind of NVH semianechoic room test macro comprises: anechoic room is used for accommodating tested equipment; Have the testboard bay basis in the described anechoic room, described tested equipment is fixed in described testboard bay basis, is provided with elastic damping between the foundation ground in described testboard bay basis and the described anechoic room; Between dynamometer machine, be used for accommodating testing apparatus, described testing apparatus comprises dynamometer machine, has the dynamometer machine base plate between described dynamometer machine, described testing apparatus is fixed in described dynamometer machine base plate, is provided with elastic damping between the foundation ground between described dynamometer machine base plate and described dynamometer machine; Sound arrester, the described tested equipment setting of ring cover is to isolate space between described anechoic room and described dynamometer machine and sound insulation; Be equipped with for axle to sound insulation on the described sound-proof wall and connect described testing apparatus and described tested equipment to carry out a plurality of coupling shafts of described test.
A kind of NVH semianechoic room method of testing, comprise step: with tested equipment layout in anechoic room, tested equipment is fixed in the testboard bay basis of anechoic room, elastic damping is set with sound insulation between the foundation ground in described testboard bay basis and the described anechoic room; The described testing apparatus that will comprise dynamometer machine is fixed in the dynamometer machine base plate between dynamometer machine, elastic damping is set with sound insulation between the foundation ground between described dynamometer machine base plate and described dynamometer machine; With with space isolation between described anechoic room and described dynamometer machine and sound insulation, that insulates against sound on the described sound-proof wall wears coupling shaft with the described tested equipment of sound arrester ring cover; Described testing apparatus is connected by described coupling shaft axle with described tested equipment, carries out described test.
Beneficial effect of the present invention is, NVH semianechoic room test macro of the present invention and NVH semianechoic room method of testing of the present invention have following advantage:
1, because the design of a plurality of coupling shafts of sound-proof wall, whole system (be whole NVH semianechoic room test macro, lower with) can satisfy simultaneously and carry out engine and parts; Wheel box; Engine+wheel box; The performance of a plurality of test patterns such as motor+wheel box and noise testing need.
2, by " in the room room " structure of anechoic room, effectively insulate against sound reaching whole system between tested equipment and dynamometer machine, improved the test data accuracy of NVH semianechoic room test macro and method.
3, use dull and stereotyped sound absorption (or noise reduction) pattern, dull and stereotyped acoustic absorbant be not easy to wear out, be out of shape anti-impact force strong, be difficult for absorption oil smoke, dust, can clean, Acceptable life is long, low-frequency signal processing is had advantage, and dull and stereotyped acoustic absorbant length is shorter, has improved the space availability ratio of anechoic room and whole system.
Description of drawings
Fig. 1 is the cross-sectional schematic of the semianechoic room test macro of prior art.
Fig. 2 is the cross-sectional schematic of NVH semianechoic room test macro of the present invention.
Fig. 3 is the first test pattern schematic diagram of NVH semianechoic room test macro of the present invention.
Fig. 4 is the second test pattern schematic diagram of NVH semianechoic room test macro of the present invention.
Fig. 5 is the 3rd test pattern schematic diagram of NVH semianechoic room test macro of the present invention.
Fig. 6 is the 4th test pattern schematic diagram of NVH semianechoic room test macro of the present invention.
Fig. 7 is the 5th test pattern schematic diagram of NVH semianechoic room test macro of the present invention.
Fig. 8 is the 6th test pattern schematic diagram of NVH semianechoic room test macro of the present invention.
Embodiment
The exemplary embodiments that embodies feature ﹠ benefits of the present invention will be described in detail in the following description.Be understood that the present invention can have at different embodiment various variations, its neither departing from the scope of the present invention, and explanation wherein and accompanying drawing be when the usefulness that explain in itself, but not in order to limit the present invention.
The NVH semianechoic room test macro of the embodiment of the invention, can use the NVH semianechoic room method of testing of the embodiment of the invention that the combination of automobile engine assembly, engine component or engine and parts is tested, use NVH semianechoic room method of testing of the present invention to test but be not limited to.Equally, the NVH semianechoic room test macro of the embodiment of the invention can be realized the NVH semianechoic room method of testing of the embodiment of the invention, uses NVH semianechoic room test macro of the present invention to realize but be not limited to.
The below introduces first one-piece construction and the function of the NVH semianechoic room test macro of the preferred embodiment of the present invention, and then how the NVH semianechoic room method of testing of introducing the preferred embodiment of the present invention is tested and can be carried out the test of those patterns.
As shown in Figure 2, embodiment of the invention NVH semianechoic room test macro, can be used in the test of automobile engine assembly and engine component, described NVH semianechoic room test macro mainly comprises between dynamometer machine 1, anechoic room 2 and sound-proof wall device, sound arrester comprises sound-proof wall 3 and sound insulation roof etc., also can comprise test macro, illuminator, shooting and monitoring system and be used for the door etc. of turnover.Wherein, be that sound-proof wall 3 is isolated into " in a room room " structure with anechoic room 2.
Anechoic room 2 is used for accommodating tested equipment; Tested equipment is such as can be engine, wheel box, engine+wheel box, vehicle bridge, wheel box+vehicle bridge etc.Has testboard bay basis 8 in the anechoic room 2, tested equipment is fixed in testboard bay basis 8, testboard bay basis 8 is arranged on foundation ground in a concave shape 9 in the anechoic room 2, testboard bay basis 8 comprises iron plate 81 and cement layer 82, be provided with elastic damping 80 between testboard bay basis 8 and the foundation ground 9, elastic damping 80 for example is rubber blanket or multilayer rubber pad, rubber blanket is array distribution in the bottom on testboard bay basis 8, can there be up to a hundred, to guarantee the stability on testboard bay basis 8.
And between dynamometer machine 1, be used for accommodating testing apparatus, testing apparatus can be Liang Tai, the dynamometer machine more than three or three 6, three dynamometer machines 6 preferably, 1 has dynamometer machine base plate 7 between dynamometer machine, dynamometer machine 6 is fixed in dynamometer machine base plate 7, dynamometer machine base plate 7 is arranged on 1 interior foundation ground in a concave shape 9 between dynamometer machine, dynamometer machine base plate 7 comprises iron plate 71 and cement layer 72, be provided with elastic damping 70 between dynamometer machine base plate 7 and the foundation ground 9, rubber blanket is array distribution in the bottom of dynamometer machine base plate 7, can have up to a hundred, to guarantee the stability of dynamometer machine base plate 7. Elastic damping 70,80 natural frequency are preferably less than 8Hz.
Sound-proof wall 3, can be individual layer, bilayer or multilayer wall, around described tested equipment setting, except foundation ground 9, be used for that space between described anechoic room and described dynamometer machine is isolated and sound insulation, sound arrester also comprises " the sound insulation roof " that encircles the tested equipment of cover with sound-proof wall; Be equipped with coupling shaft 5 on the sound-proof wall 3, coupling shaft 5 is used for axle connecting test equipment and tested equipment to carry out described test, and coupling shaft has a plurality of, adapts with the number of dynamometer machine, to connect simultaneously a plurality of testing apparatuss.Each coupling shaft 5 has two axle heads 52,56, and axle head 52,56 is supported by bracing or strutting arrangement 51,57 respectively, and bracing or strutting arrangement 51,57 bottom also are connected to dynamometer machine base plate 8, testboard bay basis 8.
Anechoic room 2 is rectangular shape preferably, but also can be other shapes such as cylinder, polygon prism, below is introduced as an example of rectangular parallelepiped example.Be equipped with coupling shaft 5 on three sound-proof walls 3 in four sides of the anechoic room 2 of rectangular parallelepiped, two coupling shaft 5 conllinear are wherein arranged, be arranged in respectively two relative sides.The sound-proof wall 4 of four sides of the anechoic room 2 of rectangular parallelepiped can comprise interior wall 33, exterior wall 31 and air blanketing 32, and interior wall 33 is in anechoic room 2 one sides, and exterior wall 31 is 1 one sides between dynamometer machine, and air blanketing 32 is between interior wall 33 and exterior wall 31.In order to ensure soundproof effect, the interior wall 33 inboards dull and stereotyped acoustic absorbant 34 that has been sticked, and require lower exterior wall 31 1 sides for eliminating the noise, the lower-cost Sound-proof material 30 that then can be sticked, and the thickness of Sound-proof material also can be less than the thickness of dull and stereotyped acoustic absorbant 34.Be filled with the glass silk flosssilk wadding in the air blanketing 32, strengthen defening effect.The described sound insulation roof of anechoic room 2 also adopts identical structure and materials with four sides, with and dynamometer machine between the isolation of 1 space and sound insulation.
As shown in Figure 2, also all be arranged with silencing plate 55 on each coupling shaft 5, to reduce it to the noise effect of anechoic room 2, coupling shaft 5 extends about 1 meter to anechoic room 2 one sides, is in order to reduce the noise effect to anechoic room 2 too.Also have, for make between dynamometer machine 1 and anechoic room 2 between good sound insulation measure will be arranged, also will there be good sound insulation measure at the porthole place that coupling shaft 5 passes sound-proof wall 3, to reach anechoic room 2 background noise requirements.When therefore in sound-proof wall 3, wearing coupling shaft 5, pad is established rubber washer 53,54 to insulate against sound between coupling shaft 5 and the sound-proof wall 3, when mounted, first rubber washer 53,54 is sheathed on coupling shaft 5 peripheries, after coupling shaft 5 installs, rubber washer 53,54 is individually fixed in exterior wall 31 and interior wall 33, has certain interval between rubber washer 53,54 interior weeks and coupling shaft 5 peripheries, with the rotation of obstruction free coupling shaft 5.
The volume of anechoic room 2 is relevant with the volume size of tested equipment, and according to the regulation of international standard ISO3745, the volume of anechoic room 2 should be not less than 200 times of tested product volume.Therefore, according to the test needs of whole system, it is 9 meters * 8 meters * 5 meters that acoustic absorbant 41 rear anechoic rooms 2 are installed.Dull and stereotyped acoustic absorbant 34 be band circular hole steel plate and CARUSO (Caruso) cotton, thereby radiomaterial do not exceed standard, and fiberless working component, so that fly upward without the mineral fiber in the air, light reflection is good, has improved working environment, has ensured worker's health.The thickness of dull and stereotyped acoustic absorbant 34 is 350mm, than 1.2 meters short much of the wedge acoustic absorbant of prior art, has saved the volume that sqound absorption construction occupies, and has therefore increased greatly the useful volume of anechoic room 2.Under above-mentioned each size condition, the width of air blanketing 32 can be 0.1 meter.
It is the key that guarantees to obtain after anechoic room 2 builds up good free found field characteristic that the sound absorption of anechoic room 2 is processed.The anechoic room 2 of NVH semianechoic room test macro of the present invention adopts the dull and stereotyped acoustic absorbant 34 of NEW TYPE OF COMPOSITE, and is not only short than the length of the wedge deadener of wedge pattern, saved the space, makes things convenient for assigning a work of tested equipment in the anechoic room 2; And dull and stereotyped acoustic absorbant 34 is indeformable, can clear up; The poriness clad can that receives greasy dirt can be laid in the surface of dull and stereotyped acoustic absorbant 34, is convenient to cleaning and maintenance.Except to the processing of high-frequency signal and wedge pattern quite, dull and stereotyped acoustic absorbant 34 is at the greater advantage that has of low-frequency signal processing, dull and stereotyped acoustic absorbant pattern becomes the selection that newly-built anechoic room is fit to user demand the most.
And between dynamometer machine 1 acoustics to require to satisfy the requirement of anechoic room ground unrest be target.Therefore, in whole system and anechoic room 2, such as test macro, illuminator, shooting and monitoring system etc. corresponding sound absorption measure to be arranged, can not affect the free found field characteristic of anechoic room 2.The whole system especially air-conditioning in the anechoic room 2, the air port of cooling-fan installation will have the measure that absorbs sound preferably, guarantees anechoic room 2 background noise requirements.
For guaranteeing the requirement of neighbourhood noise in the design objective, the door of anechoic room 2 can be and comprises from the inside to surface sound absorption door, soundproof door, intermediate course and outmost fire-proof door, and the sound reduction index Rw of door need to be greater than 55dB (A).
The below introduces the NVH semianechoic room method of testing of the embodiment of the invention again, and the NVH semianechoic room method of testing of the embodiment of the invention comprises step:
Tested equipment layout in anechoic room 2, is fixed in tested equipment on the testboard bay basis 8 of anechoic room 2, elastic damping 80 is set with sound insulation between testboard bay basis 8 and the foundation ground 9; The testing apparatus that will comprise dynamometer machine 6 is connected between dynamometer machine 1 dynamometer machine base plate 7, elastic damping 70 also is set with sound insulation between dynamometer machine base plate 7 and the foundation ground 9.
With sound-proof wall 3 and sound insulation roof ring cover tested equipment, with the isolation of 1 space and sound insulation between anechoic room 2 and dynamometer machine, sound insulation wears coupling shaft 5 on the sound-proof wall 3;
Testing apparatus is connected by coupling shaft 5 axles with tested equipment, carries out various tests.
Shown in the vertical view of Fig. 3-Fig. 8, can use three dynamometer machines to test as testing apparatus, dynamometer machine preferably exchanges the transient state dynamometer machine, the First dynamometer machine, namely dynamometer machine 1 uses rated power to be 800NM, the rated speed interchange transient state dynamometer machine as 8000rpm as 250kW, nominal torque; And in addition two dynamometer machines to be dynamometer machine 2 use rated power to exchange transient state dynamometer machine as 2700NM, rated speed as 7500rpm as 400kW, nominal torque with dynamometer machine 3, above-mentioned three dynamometer machines can be done properties development experiments and the every test of power assembly of slow-speed of revolution high-power engine and high rotating speed low-powered engine.Each dynamometer machine all can be in separately rated power, nominal torque and rated speed with the various power of Imitating, moment of torsion and rotating speed.
Dynamometer machine 1, dynamometer machine 2 and dynamometer machine 3 pass through respectively coupling shaft 1, coupling shaft 2 and coupling shaft 3 and tested equipment connection, coupling shaft 2 and coupling shaft 3 conllinear, and coupling shaft 1 can be vertical with coupling shaft 2.Generally, each dynamometer machine is namely according to as shown in Figure 7 angle fixed and arranged, and connects with the coupling shaft that is connected separately.
NVH semianechoic room test macro and the method for the embodiment of the invention can be by following six kinds of test pattern connecting test equipment and tested testing equipments, and still, the present invention is not limited to this six kinds of patterns.Each test pattern, all can carry out steady state test and metastable state test, the NVH main research is that frame and Noise Sources Identification etc. are turned round by 1m sound pressure level and acoustical power, near field sound intensity testing, structural vibration, axle system under each test pattern, mainly test by sound meter, acoustic intensity unit and acceleration transducer etc., carry out exploitation checking, the diagnosis of NVH and resolve and improve and instruct.
As shown in Figure 3, the first test pattern, MODE name is 400LD: testing apparatus is dynamometer machine 1, and tested equipment is the engine 1 of a lower-wattage, and dynamometer machine 1 is connected with described engine 1 axle by coupling shaft 1 to be tested;
As shown in Figure 4, the second test pattern, MODE name is 400HD: testing apparatus is dynamometer machine 2, tested equipment be power greater than the engine 2 of the engine 1 in described the first test pattern, dynamometer machine 2 is connected with engine 2 axles by coupling shaft 1; Certainly, this test pattern also can be tested by the dynamometer machine identical with use in the first test pattern, for example all uses dynamometer machine 2 to test.
As shown in Figure 5, the 3rd test pattern, MODE name are 411: testing apparatus is the dynamometer machine 3 of dynamometer machine 2 and simulated machine, and tested equipment is wheel box, dynamometer machine 2 is connected with gear-box axle by coupling shaft 2, and dynamometer machine 3 is connected with gear-box axle by coupling shaft 3;
As shown in Figure 6, the 4th test pattern, MODE name is 402: testing apparatus is dynamometer machine 2 and dynamometer machine 3, and tested equipment is the combination of engine, wheel box and vehicle bridge, i.e. engine assembly.Dynamometer machine 2 is connected with axle shaft by coupling shaft 2, and dynamometer machine 3 is connected with axle shaft by coupling shaft 3;
As shown in Figure 7, the 5th test pattern, MODE name is 412 not with wheel box: testing apparatus is the dynamometer machine 1 of dynamometer machine 2, dynamometer machine 3 and simulated machine, tested equipment is vehicle bridge, the dynamometer machine 1 of simulated machine is connected with axle shaft by coupling shaft 1, dynamometer machine 2 is connected with axle shaft by coupling shaft 2, and dynamometer machine 3 is connected with axle shaft by coupling shaft 3;
As shown in Figure 8, the 6th test pattern, MODE name is 412 band wheel boxes: testing apparatus is the dynamometer machine 1 of dynamometer machine 2, dynamometer machine 3 and simulated machine, tested equipment is the combination of wheel box and vehicle bridge, dynamometer machine 1 coupling shaft 1 is connected with gear-box axle, dynamometer machine is connected with described the 3rd axle shaft by the second coupling shaft, and described the 3rd dynamometer machine is connected with described the 3rd axle shaft by the 3rd coupling shaft.
The tested equipment of the same names of mentioning in different mode except particularly pointing out, both can be same vehicle bridge, same wheel box or same engine, also can be different vehicle bridge, different wheel boxes and different engines.
The main application of NVH semianechoic room test macro of the present invention and method of testing is as follows:
1, the matching optimization of electric control gasoline engine noise and discharging is demarcated, and the matching optimization of diesel combustion and noise is demarcated (using Combustion tester to do the Optimized Matching of diesel combustion and noise).
2, the different displacements power assembly is developed from Optimized Matching design, performance development, demarcation (noise testing, while also test projects such as dynamic property, economy and dischargings) and the optimal design of wheel box of different each grade ratio gearboxes and different base ratio back axles.
3, supplier's product of engine, wheel box and the front-rear axle of making certain automobile carried out noise rating, and provide scientific basis for the product quality of entrucking.(as: judging that whether a certain engine assembly has Main Noise Sources that second-order inertia power and second-order inertia moment unbalance produce etc., determines supplier's product quality, and the foundation of science is provided for buying).
4, experimental study and the exploitations (power assembly that comprises preposition front wheel driving form) such as the vibration of combustion engine powered assembly, noise rating, sunykatuib analysis, diagnosis and improvement.
5, the noise testing of auto parts and components etc.
6, combustion engine powered assembly has a lot of characteristic frequencies at low frequency range, and harmonic wave, fundamental frequency noise Acoustics Analysis are estimated.It is pioneering that this test macro at home and abroad belongs to, and reach world-class levels.
To sum up, the NVH semianechoic room test macro of the embodiment of the invention and NVH semianechoic room method of testing of the present invention mainly have the following advantages:
1, because the design of a plurality of coupling shafts 5 of sound-proof wall 3, whole system can satisfy simultaneously carries out engine and parts; Wheel box; Engine+wheel box; The performance of a plurality of test patterns such as motor+wheel box and noise testing need.
2, by " in the room room " structure of anechoic room 2, effectively tested equipment and whole system are carried out space isolation and sound insulation, improved the test data accuracy of NVH semianechoic room test macro and method.
3, use dull and stereotyped acoustic absorbant pattern, dull and stereotyped acoustic absorbant 34 be not easy to wear out, be out of shape anti-impact force strong, be difficult for absorption oil smoke, dust, can clean, Acceptable life is long, to advantage and the shorter advantage of length of low-frequency signal processing.Therefore the serviceable life that can improve whole NVH semianechoic room test macro, and reduce maintenance cost.
Technical scheme of the present invention is disclosed as above by preferred embodiment.Those skilled in the art should recognize change and the retouching of doing in the situation that does not break away from the scope and spirit of the present invention that the appended claim of the present invention discloses, all belong within the protection domain of claim of the present invention.
Claims (10)
1. a NVH semianechoic room test macro is characterized in that, described NVH semianechoic room test macro comprises:
Anechoic room is used for accommodating tested equipment; Have the testboard bay basis in the described anechoic room, described tested equipment is fixed in described testboard bay basis, is provided with elastic damping between the foundation ground in described testboard bay basis and the described anechoic room;
Between dynamometer machine, be used for accommodating testing apparatus, described testing apparatus comprises dynamometer machine, has the dynamometer machine base plate between described dynamometer machine, described testing apparatus is fixed in described dynamometer machine base plate, is provided with elastic damping between the foundation ground between described dynamometer machine base plate and described dynamometer machine;
Sound arrester, the described tested equipment setting of ring cover is to isolate space between described anechoic room and described dynamometer machine and sound insulation; Be equipped with for axle to sound insulation on the described sound-proof wall and connect described testing apparatus and described tested equipment to carry out a plurality of coupling shafts of described test.
2. NVH semianechoic room test macro as claimed in claim 1, it is characterized in that, described anechoic room is rectangular shape, described sound arrester comprises the sound-proof wall of four sides of described anechoic room and the sound insulation roof identical with material with described sound-proof wall structure, described sound-proof wall comprises the exterior wall of one side between the interior wall of described anechoic room one side, described dynamometer machine and the air blanketing between described interior wall and the described exterior wall, also all is arranged with silencing plate on described a plurality of coupling shafts.
3. NVH semianechoic room test macro as claimed in claim 2 is characterized in that, three described sides in four sides of described anechoic room are equipped with coupling shaft, and the two described coupling shaft conllinear that wear in the relative two sides.
4. NVH semianechoic room test macro as claimed in claim 2 is characterized in that, the described interior wall inboard dull and stereotyped acoustic absorbant that has been sticked, the described exterior wall outside Sound-proof material that has been sticked.
5. NVH semianechoic room test macro as claimed in claim 4, it is characterized in that, the thickness of described dull and stereotyped acoustic absorbant is 350 millimeters, the useful volume that described anechoic room behind the described dull and stereotyped acoustic absorbant is installed is 9 meters * 8 meters * 5 meters, the width of described air blanketing is 0.1 meter, is filled with the glass silk flosssilk wadding in the described air blanketing.
6. NVH semianechoic room test macro as claimed in claim 1 is characterized in that, pad is provided with rubber washer to insulate against sound between described sound-proof wall and the described coupling shaft.
7. NVH semianechoic room test macro as claimed in claim 1, it is characterized in that, the natural frequency of described elastic damping is avoided the resonant frequency of described testing apparatus, described tested equipment, described testboard bay basis and described dynamometer machine base plate less than or equal to 8hz.
8. a NVH semianechoic room method of testing is characterized in that, described NVH semianechoic room method of testing comprises step:
Tested equipment layout in anechoic room, is fixed in tested equipment on the testboard bay basis of anechoic room, elastic damping is set with sound insulation between the foundation ground in described testboard bay basis and the described anechoic room; The described testing apparatus that will comprise dynamometer machine is fixed in the dynamometer machine base plate between dynamometer machine, elastic damping is set with sound insulation between the foundation ground between described dynamometer machine base plate and described dynamometer machine;
With with space isolation between described anechoic room and described dynamometer machine and sound insulation, that insulates against sound on the described sound-proof wall wears coupling shaft with the described tested equipment of sound arrester ring cover;
Described testing apparatus is connected by described coupling shaft axle with described tested equipment, carries out described test.
9. NVH semianechoic room method of testing as claimed in claim 8, it is characterized in that, described testing apparatus comprises the first dynamometer machine, the second dynamometer machine and the 3rd dynamometer machine, can pass through respectively the first coupling shaft, the second coupling shaft and the 3rd coupling shaft and described tested equipment connection, the rated power of described the second dynamometer machine and described the 3rd dynamometer machine, nominal torque is identical with revolution, the rated power of described the second dynamometer machine is greater than the rated power of described the first dynamometer machine, the rated power of described the second dynamometer machine and nominal torque are greater than the rated power of described the first dynamometer machine, and the revolution of described the second dynamometer machine is less than the revolution of described the first dynamometer machine.
10. NVH semianechoic room method of testing as claimed in claim 9 is characterized in that, presses following test pattern connecting test equipment and tested testing equipment:
The first test pattern: testing apparatus is the first dynamometer machine, and tested equipment is the first engine, and described the first dynamometer machine is connected with described the first engine shaft by the first coupling shaft;
The second test pattern: testing apparatus is the second dynamometer machine, tested equipment be power greater than the second engine of described the first engine, described the second dynamometer machine is connected with described the second engine shaft by the first coupling shaft;
The 3rd test pattern: testing apparatus is the 3rd dynamometer machine of the second dynamometer machine and simulated machine, tested equipment is the first wheel box, described the second dynamometer machine is connected with described the first gear-box axle by the second coupling shaft, and described the 3rd dynamometer machine is connected with described the first gear-box axle by the 3rd coupling shaft;
The 4th test pattern: testing apparatus is the second dynamometer machine and the 3rd dynamometer machine, tested equipment is the combination of trimotor, the second wheel box and the first vehicle bridge, described the second dynamometer machine is connected with described the first axle shaft by the second coupling shaft, and described the 3rd dynamometer machine is connected with described the first axle shaft by the 3rd coupling shaft;
The 5th test pattern: testing apparatus is the first dynamometer machine of the second dynamometer machine, the 3rd dynamometer machine and simulated machine, tested equipment is the second vehicle bridge, described the first dynamometer machine is connected with described the second axle shaft by the first coupling shaft, described the second dynamometer machine is connected with described the second axle shaft by the second coupling shaft, and described the 3rd dynamometer machine is connected with described the second axle shaft by the 3rd coupling shaft;
The 6th test pattern: testing apparatus is the first dynamometer machine of the second dynamometer machine, the 3rd dynamometer machine and simulated machine, tested equipment is the combination of the 3rd wheel box and the 3rd vehicle bridge, described the first dynamometer machine is connected with described the 3rd gear-box axle by the first coupling shaft, described the second dynamometer machine is connected with described the 3rd axle shaft by the second coupling shaft, and described the 3rd dynamometer machine is connected with described the 3rd axle shaft by the 3rd coupling shaft.
Priority Applications (1)
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| CN103397712A (en) * | 2013-08-10 | 2013-11-20 | 厦门嘉达声学技术有限公司 | Anechoic room transmission shaft sound-insulating structure |
| CN104792519A (en) * | 2015-04-05 | 2015-07-22 | 重庆理工清研凌创测控科技有限公司 | Offline automobile gearbox NVH (noise, vibration and harshness) detecting method |
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| CN105300706A (en) * | 2015-10-22 | 2016-02-03 | 华晨汽车集团控股有限公司 | NVH performance test method for automobile acoustic package |
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| CN103397712A (en) * | 2013-08-10 | 2013-11-20 | 厦门嘉达声学技术有限公司 | Anechoic room transmission shaft sound-insulating structure |
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| CN107860581A (en) * | 2017-09-25 | 2018-03-30 | 南京航空航天大学 | A kind of vibration integrated testing stand of modular engine rotor unbalance |
| CN107860567A (en) * | 2017-10-23 | 2018-03-30 | 上汽通用汽车有限公司 | Automobile engine wheel train part noise fest platform |
| CN110823586A (en) * | 2018-08-07 | 2020-02-21 | 上汽通用汽车有限公司 | Complete vehicle abnormal sound laboratory |
| CN109000939A (en) * | 2018-08-28 | 2018-12-14 | 四川建安工业有限责任公司 | Vehicle bridge NVH testboard bay |
| AT521119B1 (en) * | 2018-09-25 | 2020-11-15 | Avl List Gmbh | Test set-up for acoustic testing of a test item at high speed |
| AT521119A1 (en) * | 2018-09-25 | 2019-10-15 | Avl List Gmbh | Test arrangement for acoustically testing a test specimen at high speed |
| CN110967172A (en) * | 2018-09-28 | 2020-04-07 | 蔚来汽车有限公司 | Silencing box and system for vibration noise test of power device |
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| CN111207942A (en) * | 2020-02-27 | 2020-05-29 | 重庆大学 | NVH rack test system of air condition compressor |
| CN112197976A (en) * | 2020-09-04 | 2021-01-08 | 中国第一汽车股份有限公司 | Four-channel road simulation test platform for NVH (noise, vibration and harshness) test |
| CN112197976B (en) * | 2020-09-04 | 2022-11-11 | 中国第一汽车股份有限公司 | Four-channel road simulation test platform for NVH (noise, vibration and harshness) test |
| CN112461552A (en) * | 2020-11-16 | 2021-03-09 | 上海拿森汽车电子有限公司 | Detection method and system of electronic power-assisted brake system and readable storage medium |
| CN112461552B (en) * | 2020-11-16 | 2023-09-26 | 上海拿森汽车电子有限公司 | Detection method and system of electronic power-assisted braking system and readable storage medium |
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