CN110987454A - Test method and device for reducing vehicle noise, test equipment and storage medium - Google Patents
Test method and device for reducing vehicle noise, test equipment and storage medium Download PDFInfo
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- CN110987454A CN110987454A CN201911337088.5A CN201911337088A CN110987454A CN 110987454 A CN110987454 A CN 110987454A CN 201911337088 A CN201911337088 A CN 201911337088A CN 110987454 A CN110987454 A CN 110987454A
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Abstract
The embodiment of the application discloses a test method, a test device, test equipment and a storage medium for reducing vehicle noise, and belongs to the field of vehicle testing, wherein the tension of a sample timing belt can be adjusted according to the tension of a target tensioner, and the sample timing belt with p candidate belt thicknesses is tested under the tension of the target tensioner to obtain p corresponding first noise data; determining a target belt thickness from the first noise data; testing a sample timing belt of q candidate belt lengths at a target tensioner tension to obtain corresponding q second noise data; determining a target belt length from the second noise data; target timing belt parameters including a target tensioner tension, a target belt thickness, and a target belt length are determined. Because this application embodiment can be through the timing belt of target timing belt parameter design, realized reducing the effect of engine noise through the experiment.
Description
Technical Field
The embodiment of the application relates to the field of vehicle testing, in particular to a testing method, a testing device, testing equipment and a storage medium for reducing vehicle noise.
Background
In the development and design process of vehicles, noise of the vehicles during operation becomes an important design index, and designers need to design vehicles with the lowest possible noise. In a vehicle, engine generated noise is a major source of noise in the vehicle.
In one possible technical scheme, a timing wheel train in the engine is closely connected with a crankshaft system and a phaser of a gas distribution system, and the accurate combustion motion process of the engine is realized through a certain transmission ratio. Due to the excitation influence of the camshaft and the crankshaft, the belt is shaken transversely and longitudinally, so that impact noise is generated between the back of the belt and the surfaces of an idler pulley, a tension pulley or a water pump and the like, and the overall sound quality of an engine is influenced. In the prior art, the noise-generating part of the engine is generally checked in a noise point checking mode in the middle and later stages of engine design, so that the cost for reducing the engine noise is high.
Disclosure of Invention
The embodiment of the application provides a test method, a test device, test equipment and a storage medium for reducing vehicle noise, and can solve the problem that in the prior art, the noise points are searched in the engine in the middle and later stages of engine design, so that the cost for reducing the engine noise is high. The technical scheme is as follows:
according to an aspect of the present application, there is provided a test method for reducing vehicle noise, the method comprising:
adjusting the tension of a sample timing belt according to the target tensioner tension, wherein the sample timing belt is a timing belt which is arranged on a target engine test bench to be tested;
testing the sample timing belt for p candidate belt thicknesses at the target tensioner tension to obtain corresponding p first noise data;
determining a target belt thickness from the first noise data, the target belt thickness being a belt thickness of the p first noise data at which an average noise is smallest;
testing said sample timing belt for q candidate belt lengths at said target tensioner tension to obtain corresponding q second noise data;
determining a target belt length from the second noise data, the target belt length being a belt length of the q second noise data at which average noise is minimum;
determining target timing belt parameters including the target tensioner tension, the target belt thickness, and the target belt length.
According to another aspect of the present application, there is provided a test apparatus for reducing noise of a vehicle, the apparatus including:
the tension adjusting module is used for adjusting the tension of a sample timing belt according to the tension of a target tensioner, wherein the sample timing belt is a timing belt which is arranged on a target engine test bench for testing;
a thickness test module for testing the sample timing belt for p candidate belt thicknesses at the target tensioner tension to obtain p corresponding first noise data;
a target thickness selection module, configured to determine a target belt thickness according to the first noise data, where the target belt thickness is a belt thickness with a minimum average noise in the p first noise data;
a length testing module for testing said sample timing belt for q candidate belt lengths under said target tensioner tension to obtain corresponding q second noise data;
a target length determination module for determining a target belt length from the second noise data, the target belt length being a belt length with a minimum average noise among the q second noise data;
a parameter determination module to determine a target timing belt parameter comprising the target tensioner tension, the target belt thickness, and the target belt length.
According to another aspect of the present application, there is provided a test rig comprising a processor and a memory having stored therein at least one instruction that is loaded and executed by the processor to implement a test method of reducing vehicle noise as provided in the practice of the present application.
According to another aspect of the present application, there is provided a computer readable storage medium having stored therein at least one instruction, which is loaded and executed by a processor to implement a test method for reducing vehicle noise as provided in the practice of the present application.
The beneficial effects brought by the technical scheme provided by the embodiment of the application can include:
the embodiment of the application can adjust the tension of a sample timing belt according to a target tensioner tension, and test the sample timing belt with p candidate belt thicknesses under the target tensioner tension to obtain p corresponding first noise data; determining a target belt thickness from the first noise data, the target belt thickness being a belt thickness of the p first noise data at which an average noise is smallest; testing said sample timing belt for q candidate belt lengths at said target tensioner tension to obtain corresponding q second noise data; determining a target belt length from the second noise data, the target belt length being a belt length of the q second noise data at which average noise is minimum; determining target timing belt parameters including the target tensioner tension, the target belt thickness, and the target belt length. According to the embodiment of the application, the target belt thickness can be determined in p candidate belt thicknesses through testing under the tension of the target tensioner, the target belt length is determined from q candidate belt lengths, the target tensioner tension, the target belt thickness and the target belt length are finally determined as target timing belt parameters, and the timing belt is designed through the target timing belt parameters, so that the effect of reducing the engine noise through testing is achieved.
Drawings
In order to more clearly describe the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a block diagram of a test apparatus provided in an exemplary embodiment of the present application;
FIG. 2 is a flow chart of a test method for reducing vehicle noise provided by an exemplary embodiment of the present application;
FIG. 3 is a flow chart of a test method for reducing vehicle noise according to another exemplary embodiment of the present application;
FIG. 4 is a schematic illustration of an engine timing belt system noise test arrangement provided based on the embodiment of FIG. 3;
FIG. 5 is a flow chart provided by a test method for reducing vehicle noise according to an embodiment of the present application;
FIG. 6 is a schematic structural diagram of a timing belt system provided in an embodiment of the present application;
FIG. 7 is a schematic external view of a tool dedicated for timing and positioning a camshaft according to an embodiment of the present disclosure;
FIG. 8 is a schematic external view of another tool dedicated to camshaft timing positioning according to an embodiment of the present disclosure;
FIG. 9 is a schematic illustration of a nominal indicating position of a tensioner pointer provided by an embodiment of the present application;
FIG. 10 is a schematic view of a graphical marking on a base body square blade of a tensioner pointer provided by an embodiment of the present application;
FIG. 11 is a schematic diagram of a noise channel time domain data provided by an embodiment of the present application;
FIG. 12 is a graphical representation of idle speed fluctuation data provided by an embodiment of the present application;
FIG. 13 is a graph of the noise spectrum of a timing belt provided by an embodiment of the present application;
FIG. 14 is a graphical comparison of noise spectra of timing belts before and after optimization using the present application as disclosed in an embodiment of the present application;
fig. 15 is a block diagram of a test apparatus for reducing vehicle noise according to an exemplary embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
In the description of the present application, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art. Further, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
For example, the test method for reducing vehicle noise shown in the embodiment of the application can be applied to test equipment which is provided with a display screen and a test function for reducing vehicle noise. The test equipment may include a vehicle-mounted computer, a tablet computer, a laptop computer, a desktop computer, a computer all-in-one machine, a workstation, an industrial robot, industrial test equipment, or the like.
Referring to fig. 1, fig. 1 is a block diagram of a testing apparatus according to an exemplary embodiment of the present application. As shown in fig. 1, the testing apparatus includes a processor 120, a memory 140, and a manipulator arm 160, wherein the memory 140 stores at least one instruction, and the instruction is loaded and executed by the processor 120 to implement the testing method for reducing vehicle noise according to the various embodiments of the method of the present application.
In the present application, the test equipment 100 is an electronic equipment having a test function of reducing vehicle noise. The test apparatus 100 is capable of adjusting the tension of a sample timing belt, which is a timing belt set on a target engine test stand for testing, according to a target tensioner tension; testing a sample timing belt of p candidate belt thicknesses at a target tensioner tension to obtain corresponding p first noise data; determining a target belt thickness from the first noise data, the target belt thickness being a belt thickness with a minimum average noise among the p first noise data; testing a sample timing belt of q candidate belt lengths at a target tensioner tension to obtain corresponding q second noise data; determining a target belt length from the second noise data, the target belt length being a belt length at which average noise is minimum among the q second noise data; target timing belt parameters are determined, including a target tensioner tension, a target belt thickness, and a target belt length.
The Memory 140 may include a Random Access Memory (RAM) or a Read-Only Memory (ROM). Optionally, the memory 140 includes a non-transitory computer-readable medium. The memory 140 may be used to store instructions, programs, code sets, or instruction sets. The memory 140 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing various method embodiments described below, and the like; the storage data area may store data and the like referred to in the following respective method embodiments.
The mechanical manipulator arm 160 may be used to adjust the timing belt of the sample as it is tested on the target engine test rig. The robotic arm 160 may also be used to replace sample timing belts corresponding to p candidate belt thicknesses on the target engine test rig and to replace sample timing belts corresponding to q candidate belt lengths on the target engine test rig.
Referring to fig. 2, fig. 2 is a flowchart of a test method for reducing vehicle noise according to an exemplary embodiment of the present application. The test method for reducing the vehicle noise can be applied to the test equipment shown in the figure 1. In fig. 2, the test method for reducing the vehicle noise includes:
and step 210, adjusting the tension of a sample timing belt according to the tension of the target tensioner, wherein the sample timing belt is a timing belt which is arranged on a target engine test bench for testing.
In the present embodiment, the target tensioner tension is the tensioner tension that most noiselessly performs on the target engine test rig. The tensioner tension can be obtained by conducting a multi-pass test through a designated sample timing belt. In the present example, the test apparatus adjusted the sample timing belt tension to the target tensioner tension.
In one possible adjustment mode, after acquiring the tension of the target tensioner, the testing equipment drives the mechanical arm to adjust the tension of the timing belt tested on the target engine test bench to the target tension.
In the present example, the test apparatus tests p sample timing belts mounted on a target engine test rig under a target tensioner tension. Note that the belt thickness of p sample timing belts was different between each two timing belts.
And step 230, determining a target belt thickness according to the first noise data, wherein the target belt thickness is the belt thickness with the minimum average noise in the p first noise data.
In an embodiment of the present application, the test equipment is capable of determining a target belt thickness from the first noise data, the target belt thickness being a belt thickness at which an average noise is smallest among the p first noise data. It should be noted that the noise is collected by a near-field microphone provided in the test apparatus and is obtained by a processor and a memory in the test apparatus in cooperation.
At step 240, a sample timing belt of q candidate belt lengths is tested at the target tensioner tension to obtain q corresponding second noise data.
Illustratively, the test apparatus will maintain a target tensioner tension and test a sample timing belt for q candidate belt lengths to obtain corresponding q second noise data. In the q sample timing belts, the lengths of every two sample timing belts are different.
And step 250, determining a target belt length according to the second noise data, wherein the target belt length is the belt length with the minimum average noise in the q second noise data.
Illustratively, the noise generated by each sample timing belt during the test varied. In the embodiment of the application, the testing equipment can record the noise of the sample timing belt in the whole testing process and calculate the average noise of the sample timing belt in the whole testing process. The embodiment of the present application determines the belt length of the q second noise data at which the average noise is the smallest as the target belt length.
In step 260, target timing belt parameters are determined, including target tensioner tension, target belt thickness, and target belt length.
In the present embodiment, the test equipment will determine the target timing belt parameters through the above described test procedure. After the target timing belt parameters are determined, the test equipment can transmit the target timing belt parameters to an engine design department or a whole vehicle design department, so that the difficulty that the timing belt meets the NVH (Noise vibration, Harshness, Noise vibration and smoothness) requirements of the whole engine is reduced.
In summary, the test method for reducing vehicle noise provided by the embodiment can determine the appropriate target belt thickness and target belt length by setting the target tensioner tension and determining the target timing belt parameters including the target tensioner tension, the target belt thickness and the target belt length through the noise data, thereby reducing the difficulty of the timing belt meeting the NVH requirements of the complete engine.
Referring to fig. 3, fig. 3 is a flowchart of a testing method for reducing vehicle noise according to another exemplary embodiment of the present application. The test method for reducing the vehicle noise can be applied to the test equipment shown above. In fig. 3, the test method for reducing vehicle noise includes:
in step 311, n microphones are placed at target locations around a target engine test rig.
In the embodiment of the present application, n is an integer of not less than 2.
Illustratively, n may take the value of 5, and the n microphones include an intake side microphone, an exhaust side microphone, a front end microphone, an upper microphone, and a near field microphone.
In step 312, a near field microphone is placed in parallel with the timing belt, and first noise data Q1 is collected.
In the present embodiment, the near field microphone is one of n microphones, and the timing belt is provided on the target engine of the target engine test stand.
The target engine is provided with a Hall rotating speed sensor, and the Hall rotating speed sensor is used for measuring the rotating speed of the target engine.
In step 314, a abnormal noise position where abnormal noise is generated in the timing belt is determined based on the first noise data Q1 and the second noise data Q2.
In the embodiment of the present application, the dimensions of the noise parameters collected by the first noise data Q1 and the second noise data Q2 are the same, and the data acquisition method of the first noise data Q1 and the second noise data Q2 is the same, and the data acquisition method is a plane sweep sound measurement method.
And step 315, determining m tensioner assembly samples according to the abnormal sound positions.
In the embodiment of the application, the static tension parameters of the tensioner assembly samples are different in pairs, and the static tension parameters of the tensioner assembly samples are in the tension range corresponding to the timing belt.
In step 316, the noise spectra of the m tensioner assembly samples are tested separately by the gantry engine and the n microphones.
And step 317, acquiring the target tensioner tension according to the noise frequency spectrum.
In the present embodiment, the target tensioner tension is the tension corresponding to the target tensioner, and the target tensioner is the tensioner assembly sample with the lowest average loudness of the noise spectrum in each frequency domain.
Alternatively, the target tensioner tension is a tension at an abnormal sound position when the target engine is cold.
Referring to fig. 4, fig. 4 is a schematic diagram of a noise testing arrangement of an engine timing belt system based on the embodiment shown in fig. 3. In fig. 4, a near field microphone, a hall tacho sensor 420, an untimed cover motor 430, a gantry drive shaft 440, a gantry operator 450, a noise processing system 460, a computer 470 are included.
The microphones include far-field microphone 411, far-field microphone 412, far-field microphone 413, far-field microphone 414, and near-field microphone 415, among others. The far-field microphone 411 is arranged on the intake side of the non-timing-cover motor 430, the far-field microphone 412 is arranged above the non-timing-cover motor 430, the far-field microphone 413 is arranged on the exhaust side of the non-timing-cover motor 430, the far-field microphone 414 is arranged at the front end of the non-timing-cover motor 430, and the near-field microphone 415 is arranged at the near field of the non-timing-cover motor 430.
In the implementation environment shown in fig. 4, a hall sensor 420 is mounted at the rear end of the engine 430 with no timing cover near the flywheel for tracking the engine speed. The untimed cover motor 430, the gantry drive shaft 440, and the gantry operator 450 are connected by physical means. The microphone is connected to the noise processing system 460 via a cable capable of transmitting electrical signals, and the hall sensor 420 is also connected to the noise processing system 460 via a cable capable of transmitting electrical signals.
At step 330, sample timing belts of p candidate belt thicknesses are tested at the target tensioner tension to obtain corresponding p first noise data.
A target belt thickness is determined based on the first noise data, step 340.
Wherein the sample timing belt lengths of the q candidate belt lengths are all target belt thicknesses.
A target belt length is determined based on the second noise data, step 360.
In step 370, a target timing belt parameter is determined.
In the embodiment of the present application, the execution process of step 320 to step 370 may refer to the execution process of step 210 to step 260, which is not described herein again.
In summary, in the embodiment, the target engine is arranged on the test bed, the noise of the timing belt is tested through the target engine, the near-field microphone respectively collects noise data through two orthogonal directions, so that the position where the abnormal noise is generated is determined, the corresponding tensioner assembly sample is determined according to the position where the abnormal noise is generated, the tensioner assembly sample with the minimum noise is determined from the plurality of tensioner assembly samples, and then the target belt thickness and the target belt length of the main belt are determined through the subsequent steps, so that the noise performance of the timing belt system is optimized. In the initial stage of project development, a reliable timing belt system is obtained, a timing system design scheme meeting the NVH requirements of the whole engine is selected, and the later optimization cost of the engine can be greatly reduced.
Based on the method shown in the embodiment, the embodiment of the application also provides a test method for reducing the vehicle noise, a reliable timing belt system can be obtained at the initial stage of engine project development, a timing system design method meeting the NVH requirements of the whole engine can be selected preferentially, the cost of the engine can be optimized at the later stage, the engine noise is reduced, and the running stability of the vehicle is improved. Please refer to the following examples.
Referring to fig. 5, fig. 5 is a flowchart provided by a testing method for reducing vehicle noise according to an embodiment of the present application. It should be noted that there are many operation steps in the embodiments of the present application, and all the operation steps can be performed by a mechanical operation arm in the test equipment. Wherein the method comprises the following steps:
Illustratively, the wiring harness comprises a power line and a data line, the waterway is used for supplying water to the test equipment, and the pipeline comprises other pipelines required by the test equipment in the operation process.
And step 512, arranging five microphones on the air inlet side, the air exhaust side, the front end, the upper part and the near field of the engine respectively, and testing the noise of the timing system when the engine rotates. A Hall rotating speed sensor is fixed at the position, close to a flywheel, of the rear end of the engine and used for tracking the rotating speed of the engine.
And 513, connecting all the microphones and the hall rotating speed sensors in the near field and the far field with BBM testing equipment, setting relevant channel parameters for a BBM acquisition system on a computer, debugging whether each sensor works normally, and calibrating the microphones by a microphone calibrator.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a timing belt system according to an embodiment of the present disclosure. In fig. 6, the device includes a crankshaft pulley (18), a timing belt (19), a water pump (20), an idler pulley 1(21), an intake side VVT (22), an exhaust side VVT (23), an idler pulley 2(24), a timing tensioner assembly stopper piece (25), a tensioner (26), and a hexagonal flange bolt (27).
Referring to fig. 7, fig. 7 is a schematic external view of a tool dedicated for timing and positioning a camshaft according to an embodiment of the present application.
Referring to fig. 8, fig. 8 is a schematic external view of another tool dedicated for positioning camshaft timing according to an embodiment of the present application.
Referring to fig. 9, fig. 9 is a schematic diagram of a nominal indicating position of a tensioner pointer provided by an embodiment of the present application. Position 90 is the nominal indicated position of the tensioner pointer.
Referring to fig. 10, fig. 10 is a schematic view of a graphical marking on a base body square blade of a tensioner pointer provided by an embodiment of the present application. In fig. 10, the tensioner finger is referenced 1 near the upper edge of the extended square piece, 2 at the upper edge of the U-shaped slot, 3 at the center line of the U-shaped slot, 4 at the lower edge of the U-shaped slot, and 4.5 at the middle of the lower edges of the extended square pieces, 4 and 5.
And step 514, starting the engine in the original state, heating circulating water, and when the temperature of the standby oil reaches 90 ℃, enabling a near field microphone sensor to be parallel to the direction of the belt, and respectively carrying out equidistant noise collection at the meshing positions (14, A, B, C, D, E, F, G, H, K, L, M, N) between the timing belt and the crankshaft belt wheel (18), the water pump (20), the idler pulley 1(21), the air inlet side VVT (22), the exhaust side VVT (23), the idler pulley 2(24) and the tensioner (26) by a plane sweep sound measurement method to obtain a group of data Q1.
And 516, performing BBM post-processing analysis to obtain a noise color map and a frequency spectrum diagram of the two groups of timing belts meshed with the sections of the gear train, analyzing and comparing the noise of the timing system of all the measuring points of the two groups of data, accurately and quickly locking the position of the abnormal sound source of the timing belt system, and analyzing the mechanism of generating the abnormal sound.
And 517, specifically, carrying out an optimized design scheme according to the position of the abnormal sound source locked in the steps 514 to 516, selecting tensioner assembly sample pieces (at least three, including an upper limit tension tensioner, a nominal tension tensioner and a lower limit tension tensioner) with different static tension parameters within the allowable tension range of the timing belt (19), selecting the sample pieces according to key structural design parameters by the timing belt (19), namely ① belt thickness, batch thickness belt, thickening optimized upper limit thickness belt, nominal thickness belt and lower limit thickness belt, ② belt length, batch length belt, lengthening optimized upper limit CD belt, nominal CD belt and lower limit CD belt.
And 518, positioning by using a camshaft timing positioning tool (special tool 1) and a crankshaft timing positioning tool (special tool 2).
And step 519, installing a certain tension timing tensioner assembly (26) on the cylinder body through a hexagonal flange face bolt (27), wherein a timing tensioner assembly limiting piece (25) is located in a groove of the cylinder body and screwed in and not screwed down temporarily.
Step 520, installing a tensioner tool, selecting a certain batch of production timing belts (19), installing the belts on the belt wheels, and clockwise adjusting an adjuster on the tensioner tool by using an inner hexagon wrench until a pointer of the timing tensioner assembly is aligned with the middle (3) of the timing notch mark U-shaped groove on the base (wherein, the tensioner assembly (26) is arranged within an allowable range (see fig. 9), namely an upper limit position (2), a nominal position (3) and a lower limit position (5)), namely the pointer points to a nominal indication position of the tensioner (fig. 5). The adjustment is then rotated 5-10 degrees further and then returned to a certain angle, again rotating the adjuster clockwise until the pointer points to a marked location on the base, i.e., a neutral position on the base (the purpose of the iterative adjustment is to confirm that the actual tensioner can be properly tensioned and acted upon). Finally, the hexagonal flange face bolts (27) are tightened.
And step 521, in a cold state of the engine, measuring the belt tension at the end of the abnormal sound by using a tension meter, and recording.
Step 522, noise spectrum data is collected.
The test equipment can start the engine, heat the circulating water, and when the standby oil temperature reaches 90 ℃, the collection equipment of the BBM test system starts to collect the microphone noise signals of 3 groups of timing systems, and the Hall sensor measures the engine speed signals. After BBM post-processing analysis is carried out, time domain data of all channels of the 3 groups of timing belt systems are obtained (such as fig. 11 and 12), and a noise spectrogram of the timing belt can be obtained by further analyzing the time domain data (such as fig. 13).
Referring to fig. 11, fig. 11 is a schematic diagram of noise channel time domain data according to an embodiment of the present disclosure.
Referring to fig. 12, fig. 12 is a schematic diagram of idle speed fluctuation data provided in an embodiment of the present application.
Referring to fig. 13, fig. 13 is a noise spectrum diagram of a timing belt according to an embodiment of the present disclosure.
Step 523, selecting a group with the best noise performance from the noise color map and the frequency spectrum of the 3 groups of timing belt systems obtained in step 522, and storing the data frequency spectrum map.
And 524, sequentially repeating the steps 518 to 523, and measuring the tensioner assembly schemes with different tensions in the step 517 to obtain K sets of spectrograms of timing belt noise related to the tension of the tensioner.
And step 525, selecting a group with the best noise performance from the K groups of noise spectrograms, and storing and recording the tensioner tension corresponding to the group of test results.
And 526, loosening the hexagon flange face bolt (27) of the tensioner and the limiting piece (25) of the tensioner assembly on the cylinder body, replacing the tensioner assembly sample (26) with the best noise performance, and replacing a certain optimized thickening timing belt (19) sample in the step 517.
And 527, repeating 518 to 523 in sequence, and finishing the measurement of the timing belt schemes with different thicknesses in 517 to obtain M sets of noise frequency spectrograms related to the timing belt.
And 529, loosening the hexagon flange face bolt of the tensioner and the limiting sheet of the tensioner assembly on the cylinder body, replacing the tensioner assembly sample piece with the best noise performance and the belt thickness sample piece, and replacing a certain optimized lengthened timing belt sample piece in 517.
And 531, selecting one group with the best noise performance from the N groups of noise spectrograms, storing and recording timing belt parameters corresponding to the group of test results, wherein the belt length corresponding to the amplitude spectrograms is the combination of the tensioner tension and the belt parameters with the best noise performance of the timing belt.
Referring to fig. 14, fig. 14 is a comparison diagram of noise spectra of timing belts before and after optimization using the present application, which is disclosed in the embodiment of the present application. Where curve 1410 is used to represent the noise spectrum of the timing belt before optimization and curve 1420 is used to represent the noise spectrum of the timing belt after optimization.
In summary, the test method for reducing vehicle noise provided by this embodiment can perform installation control on the tensioner pointer position by using the tensioner installation tool, measure the tension of the timing belt by using the tensioner, monitor the engine rotation speed by using the hall rotation speed sensor, input each measurement signal into the collection device of the BBM test system, and perform post-processing analysis by using the BBM to obtain the spectrogram capable of reflecting the timing belt system noise. The test method uses a plane sweep sound measuring method, and facilitates the microphone sensor to carry out multidimensional, omnibearing, rapid and convenient noise scanning parallel to the timing belt or perpendicular to the timing belt, more accurately and rapidly lock the position of the abnormal noise source, and analyze the mechanism of generating the abnormal noise; and based on the method for controlling the tension by adjusting the nominal installation position of the tensioner, the adverse effect of the tension sensitivity of the tensioner on the noise of the system is reduced to the maximum extent, the tension with the optimal performance of the system is found, the influence of other factors (such as structural parameters of a belt) on the timing noise is identified under the optimal tension, and the design parameters of the timing system with the optimal performance of the noise are determined by comparing noise spectrums, so that the noise performance of the timing belt system is optimized. In the initial stage of project development, a reliable timing belt system is obtained, a timing system design scheme meeting the NVH requirements of the whole engine is selected, and the later optimization cost of the engine can be greatly reduced.
The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.
Referring to fig. 15, a block diagram of a vehicle noise reduction testing apparatus according to an exemplary embodiment of the present application is shown. The vehicle noise reduction test apparatus may be implemented as all or part of a test device by software, hardware, or a combination of both. The device includes:
a tension adjustment module 1510 for adjusting tension of a sample timing belt, which is a timing belt set on a target engine test bench for testing, according to a target tensioner tension;
a thickness test module 1520 for testing the sample timing belt for p candidate belt thicknesses at the target tensioner tension to obtain p corresponding first noise data;
a target thickness selection module 1530, configured to determine a target belt thickness according to the first noise data, where the target belt thickness is a belt thickness with the smallest average noise in the p first noise data;
a length test module 1540 for testing the sample timing belt for q candidate belt lengths at the target tensioner tension to obtain q corresponding second noise data;
a target length determination module 1550 for determining a target belt length from the second noise data, the target belt length being a belt length with a smallest average noise among the q second noise data;
a parameter determination module 1560 for determining target timing belt parameters including the target tensioner tension, the target belt thickness, and the target belt length.
In an optional embodiment, the apparatus further comprises an execution module for setting n microphones at a target position around the target engine test stand, n being an integer not less than 2; arranging a near-field microphone in parallel with a timing belt arranged on a target engine of the target engine test stand, and acquiring first noise data Q1, wherein the near-field microphone is one of the n microphones; arranging the near-field microphone and the timing belt vertically, and collecting second noise data Q2; determining an abnormal noise position where abnormal noise is generated in the timing belt, based on the first noise data Q1 and the second noise data Q2; determining m tensioner assembly samples according to the abnormal sound positions, wherein the static tension parameters of the tensioner assembly samples are different in pairs, and the static tension parameters of the tensioner assembly samples are in the tension range corresponding to the timing belt; respectively testing the noise frequency spectrums of the m tensioner assembly samples through the bench engine and the n microphones; and acquiring a target tensioner tension according to the noise spectrum, wherein the target tensioner tension is a tension corresponding to a target tensioner, and the target tensioner is a tensioner assembly sample with the lowest average loudness of the noise spectrum on each frequency domain.
In an alternative embodiment, the dimensions of the noise parameters collected by the first noise data Q1 and the second noise data Q2 involved in the device are the same, and the data acquisition method of the first noise data Q1 and the second noise data Q2 is the same, and the data acquisition method is a sweep plano sounding method.
In an alternative embodiment, the length test module 1540 is configured to test the sample timing belt for q candidate belt lengths at the target tensioner tension to obtain q corresponding second noise data; wherein the sample timing belt lengths of the q candidate belt lengths are all the target belt thickness.
In an alternative embodiment, said means relates to said target tensioner tension being the tension at said abnormal sound location when said target engine is cold.
In an alternative embodiment, the device relates to the target engine, wherein a Hall rotating speed sensor is arranged in the target engine and is used for measuring the rotating speed of the target engine.
In an alternative embodiment, the n microphones involved in the apparatus include an intake side microphone, an exhaust side microphone, a front end microphone, an upper microphone, and a near field microphone, and n is 5.
The embodiment of the present application further provides a computer-readable medium, which stores at least one instruction, and the at least one instruction is loaded and executed by the processor to implement the test method for reducing vehicle noise according to the above embodiments.
It should be noted that: in the test apparatus for reducing vehicle noise provided in the above embodiment, when the test method for reducing vehicle noise is executed, only the division of the above functional modules is taken as an example, and in practical applications, the above functions may be distributed to different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions. In addition, the test device for reducing the vehicle noise and the test method embodiment for reducing the vehicle noise provided by the above embodiments belong to the same concept, and specific implementation processes thereof are detailed in the method embodiments and are not described herein again.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the implementation of the present application and is not intended to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A test method for reducing vehicle noise, the method comprising:
adjusting the tension of a sample timing belt according to the target tensioner tension, wherein the sample timing belt is a timing belt which is arranged on a target engine test bench to be tested;
testing the sample timing belt for p candidate belt thicknesses at the target tensioner tension to obtain corresponding p first noise data;
determining a target belt thickness from the first noise data, the target belt thickness being a belt thickness of the p first noise data at which an average noise is smallest;
testing said sample timing belt for q candidate belt lengths at said target tensioner tension to obtain corresponding q second noise data;
determining a target belt length from the second noise data, the target belt length being a belt length of the q second noise data at which average noise is minimum;
determining target timing belt parameters including the target tensioner tension, the target belt thickness, and the target belt length.
2. The method of claim 1, wherein prior to said adjusting the tension of the sample timing belt based on the target tensioner tension, the method further comprises:
setting n microphones at target positions around the target engine test bed, wherein n is an integer not less than 2;
arranging a near-field microphone in parallel with a timing belt arranged on a target engine of the target engine test stand, and acquiring first noise data Q1, wherein the near-field microphone is one of the n microphones;
arranging the near-field microphone and the timing belt vertically, and collecting second noise data Q2;
determining an abnormal noise position where abnormal noise is generated in the timing belt, based on the first noise data Q1 and the second noise data Q2;
determining m tensioner assembly samples according to the abnormal sound positions, wherein the static tension parameters of the tensioner assembly samples are different in pairs, and the static tension parameters of the tensioner assembly samples are in the tension range corresponding to the timing belt;
respectively testing the noise frequency spectrums of the m tensioner assembly samples through the bench engine and the n microphones;
and acquiring a target tensioner tension according to the noise spectrum, wherein the target tensioner tension is a tension corresponding to a target tensioner, and the target tensioner is a tensioner assembly sample with the lowest average loudness of the noise spectrum on each frequency domain.
3. The method as claimed in claim 2, wherein the dimensions of the noise parameters collected by the first noise data Q1 and the second noise data Q2 are the same, and the data acquisition method of the first noise data Q1 and the second noise data Q2 is the same, and the data acquisition method is a sweep plano sounding method.
4. The method of claim 3, wherein said testing said sample timing belt for q candidate belt lengths at said target tensioner tension for corresponding q second noise data comprises:
testing said sample timing belt for q candidate belt lengths at said target tensioner tension to obtain corresponding q second noise data;
wherein the sample timing belt lengths of the q candidate belt lengths are all the target belt thickness.
5. The method of claim 2, wherein the target tensioner tension is a tension at the squeak position when the target engine is cold.
6. The method according to any one of claims 2 to 5, wherein a Hall rotation speed sensor is provided in the target engine for measuring a rotation speed of the target engine.
7. The method of any of claims 2 to 5, wherein n is 5, and the n microphones comprise an intake side microphone, an exhaust side microphone, a front end microphone, an over microphone, and a near field microphone.
8. A test apparatus for reducing vehicle noise, the apparatus comprising:
the tension adjusting module is used for adjusting the tension of a sample timing belt according to the tension of a target tensioner, wherein the sample timing belt is a timing belt which is arranged on a target engine test bench for testing;
a thickness test module for testing the sample timing belt for p candidate belt thicknesses at the target tensioner tension to obtain p corresponding first noise data;
a target thickness selection module, configured to determine a target belt thickness according to the first noise data, where the target belt thickness is a belt thickness with a minimum average noise in the p first noise data;
a length testing module for testing said sample timing belt for q candidate belt lengths under said target tensioner tension to obtain corresponding q second noise data;
a target length determination module for determining a target belt length from the second noise data, the target belt length being a belt length with a minimum average noise among the q second noise data;
a parameter determination module to determine a target timing belt parameter comprising the target tensioner tension, the target belt thickness, and the target belt length.
9. A test rig comprising a processor, a memory coupled to the processor, and program instructions stored on the memory, the processor when executing the program instructions implementing a test method for reducing vehicle noise according to any one of claims 1 to 7.
10. A computer readable storage medium having stored thereon program instructions, when executed by a processor, to implement a vehicle noise reduction test method according to any one of claims 1 to 7.
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