CN106777781B - Vibration isolation performance analysis method and device for vibration isolation piece and rigidity determination method and device - Google Patents

Vibration isolation performance analysis method and device for vibration isolation piece and rigidity determination method and device Download PDF

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CN106777781B
CN106777781B CN201710018290.6A CN201710018290A CN106777781B CN 106777781 B CN106777781 B CN 106777781B CN 201710018290 A CN201710018290 A CN 201710018290A CN 106777781 B CN106777781 B CN 106777781B
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sound pressure
vibration isolation
frequency
pressure level
curve
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CN106777781A (en
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陈东
段龙杨
邓磊
余显忠
李慧
涂晴
黄玮
金栋
姜琼
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Jiangling Motors Corp Ltd
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Abstract

A vibration isolation performance analysis method, a rigidity determination method and a device of a vibration isolation piece are provided, wherein the vibration isolation performance analysis method of the vibration isolation piece comprises the following steps: calculating a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of an attachment point on the driving side of the vibration isolation piece to obtain a plurality of first sound pressure levels; calculating a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of the attachment point on the passive side of the vibration isolation piece to obtain a plurality of second sound pressure levels; calculating the sound pressure level corresponding to each frequency in the preset frequency range according to the rigidity of the vibration isolation piece to obtain a plurality of third sound pressure levels; and when the difference value between each of the plurality of third sound pressure levels and the first sound pressure level of the corresponding frequency and the difference value between each of the plurality of third sound pressure levels and the second sound pressure level of the corresponding frequency are both greater than a target vibration isolation amount, determining that the vibration isolation performance of the vibration isolation member is qualified.

Description

Vibration isolation performance analysis method and device for vibration isolation piece and rigidity determination method and device
Technical Field
The invention relates to the technical field of automobiles, in particular to a vibration isolation performance analysis method, a rigidity determination method and a device for a vibration isolation piece.
Background
NVH (Noise, Vibration, Harshness) performance of automobiles affects the comfort of passengers in the automobile. The NVH problem is essentially a response control problem of a source, a transmission path, and a receiver. Various vibration and noise sources such as an engine, a power transmission system and a rugged road are transmitted to drivers and passengers serving as receivers of vibration and noise in the vehicle through different paths.
The vibration isolation parts such as suspensions, rubber bushings and lifting lugs on the automobile are the most important rings on the path from various vibration sources to the interior of the automobile, and on the transmission path, the vibration isolation parts with good vibration isolation performance can greatly attenuate vibration transmission, so that the comfort and NVH performance of the automobile are improved. In the prior art, the analysis of the vibration isolation of the vibration isolator still stays in the aspect of sense organ, and the self feeling is judged when a driver drives the whole vehicle. However, such judgment is inaccurate due to human sensory differences, and the vibration isolating performance of each vibration isolator cannot be specifically analyzed.
Generally, the greater the stiffness of the isolator, the less the vehicle body will affect the vibration source (e.g., the less the vibration displacement generated in response), the better the isolator performance, and the more comfortable the NVH performance. However, the vibration insulators need to have a certain rigidity to resist deformation, and therefore, it is important to select a vibration insulator having an appropriate rigidity. At present, to vibration isolation spare research and development, design such as suspension, rubber bush, lug many according to project experience or refer to the benchmark motorcycle type earlier stage in the project, the project research and development initial stage is difficult to combine digital sample car to carry out reasonable analysis and evaluation to the vibration isolation effect of vibration isolation spare, and this research and development that makes earlier stage vibration isolation spare has certain blindness for the regulation work of project later stage to vibration isolation spare is very heavy. When a sample car is calibrated and the NVH problem related to the whole car is calibrated, the vibration isolation piece which can meet the target vibration isolation amount is designed according to the test values of the active side and the passive side of the vibration isolation piece. And the vibration isolation parts such as suspension, rubber bushing, lifting lug and the like used on the automobile are more, and how to realize the reasonable design of each vibration isolation part is huge in workload.
Disclosure of Invention
In view of the above-mentioned circumstances, it is necessary to provide a method and a device for analyzing vibration isolation performance of a vibration isolator, and a method and a device for determining stiffness, which are directed to the problems of inaccurate analysis of vibration isolation performance of a vibration isolator and difficulty in selecting a vibration isolator having appropriate stiffness in the related art.
The invention provides a vibration isolation performance analysis method of a vibration isolation piece, which comprises the following steps:
calculating a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of an attachment point on the driving side of the vibration isolation piece to obtain a plurality of first sound pressure levels;
calculating a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of the attachment point on the passive side of the vibration isolation piece to obtain a plurality of second sound pressure levels;
calculating the sound pressure level corresponding to each frequency in the preset frequency range according to the rigidity of the vibration isolation piece to obtain a plurality of third sound pressure levels;
and when the difference value between each of the plurality of third sound pressure levels and the first sound pressure level of the corresponding frequency and the difference value between each of the plurality of third sound pressure levels and the second sound pressure level of the corresponding frequency are both greater than a target vibration isolation amount, determining that the vibration isolation performance of the vibration isolation member is qualified.
In the method for analyzing vibration isolation performance, when the difference between each of the plurality of third sound pressure levels and the first sound pressure level at the corresponding frequency and the difference between each of the plurality of third sound pressure levels and the second sound pressure level at the corresponding frequency are both greater than a target vibration isolation amount, the step of determining that the vibration isolation performance of the vibration isolator is qualified includes:
drawing a curve of the first sound pressure level changing along with the frequency to obtain a first sound pressure/frequency curve, and drawing a curve of the second sound pressure level changing along with the frequency to obtain a second sound pressure/frequency curve;
drawing a curve of the value obtained by subtracting the target vibration isolation amount from the third sound pressure level along with the change of the frequency to obtain a target vibration isolation curve;
and when the first sound pressure/frequency curve and the second sound pressure/frequency curve are below the target vibration isolation curve, determining that the vibration isolation performance of the vibration isolation piece is qualified.
In the vibration isolation performance analysis method, the calculation formulas of the first sound pressure level and the second sound pressure level are respectively:
Figure BDA0001207476370000021
Figure BDA0001207476370000031
wherein,
Figure BDA0001207476370000032
the point mobility of the active side of the vibration isolator after normalization processing,
Figure BDA0001207476370000033
the point mobility of the passive side of the vibration isolator after normalization processing is adopted.
In the vibration isolation performance analysis method, a calculation formula of the third sound pressure level is as follows:
Figure BDA0001207476370000034
where f denotes the frequency, and k is the stiffness of the vibration isolator at the frequency f.
The invention also provides a rigidity determination method of the vibration isolation piece, which comprises the following steps:
calculating a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of an attachment point on the driving side of the vibration isolation piece to obtain a plurality of first sound pressure levels;
calculating a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of the attachment point on the passive side of the vibration isolation piece to obtain a plurality of second sound pressure levels;
calculating a stiffness of the vibration isolator based on the first plurality of sound pressure levels, the second plurality of sound pressure levels, and a target vibration isolation amount.
The method for determining the stiffness of the vibration isolator, wherein the step of calculating the stiffness of the vibration isolator according to the first sound pressure levels, the second sound pressure levels and the target vibration isolation amount comprises:
determining a most significant sound pressure level of the first plurality of sound pressure levels and the second plurality of sound pressure levels;
and calculating the rigidity of the vibration isolation piece according to the sum of the sound pressure level with the maximum value and the target vibration isolation amount.
In the method for determining the stiffness of the vibration isolator, the calculation formulas of the first sound pressure level and the second sound pressure level are respectively as follows:
Figure BDA0001207476370000035
Figure BDA0001207476370000036
wherein,
Figure BDA0001207476370000037
the point mobility of the active side of the vibration isolator after normalization processing,
Figure BDA0001207476370000038
the point mobility of the passive side of the vibration isolation part after normalization processing is adopted.
The stiffness determination method of the vibration isolation member comprises the following steps:
Figure BDA0001207476370000041
wherein, SPL3＝SPLmax+ Δ d, f denotes frequency, SPLmaxAnd Δ d is a target vibration isolation amount, which is a sound pressure level having a largest value among the plurality of first sound pressure levels and the plurality of second sound pressure levels.
The present invention also provides a vibration isolation performance analysis device for a vibration isolator, comprising:
the first calculation module is used for calculating the sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of the attachment point on the driving side of the vibration isolation piece to obtain a plurality of first sound pressure levels;
the second calculation module is used for calculating the sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of the attachment point on the passive side of the vibration isolation piece to obtain a plurality of second sound pressure levels;
the third calculation module is used for calculating the sound pressure level corresponding to each frequency in the preset frequency range according to the rigidity of the vibration isolation piece to obtain a plurality of third sound pressure levels;
and the determining module is used for determining that the vibration isolation performance of the vibration isolation piece is qualified when the difference value between the plurality of third sound pressure levels and the first sound pressure level of the corresponding frequency and the difference value between the plurality of third sound pressure levels and the second sound pressure level of the corresponding frequency are both larger than a target vibration isolation amount.
The vibration isolation performance analysis device described above, wherein the determination module includes:
the drawing module is used for drawing a curve of the first sound pressure level changing along with the frequency to obtain a first sound pressure/frequency curve, drawing a curve of the second sound pressure level changing along with the frequency to obtain a second sound pressure/frequency curve, and drawing a curve of a value obtained by subtracting the target vibration isolation amount from the third sound pressure level changing along with the frequency to obtain a target vibration isolation curve;
and the determining submodule is used for determining that the vibration isolation performance of the vibration isolation piece is qualified when the first sound pressure/frequency curve and the second sound pressure/frequency curve are below the target vibration isolation curve.
According to the invention, a first sound pressure level and a second sound pressure level are respectively obtained according to the mobility of the attachment points of the active side and the passive side of the vibration isolation piece, a third sound pressure level is obtained according to the rigidity of the vibration isolation piece, the difference value between the first sound pressure level and the third sound pressure level is calculated, the difference value between the second sound pressure level and the third sound pressure level is calculated, and when all the calculated difference values are greater than a target sound pressure value, the vibration isolation performance of the vibration isolation piece is qualified.
Drawings
Fig. 1 is a flowchart of a vibration isolation performance analysis method of a vibration isolator according to a first embodiment of the present invention;
fig. 2 is a flowchart of a vibration isolation performance analysis method of a vibration isolator according to a second embodiment of the present invention;
fig. 3 is a sound pressure/frequency graph of a vibration isolating member according to a second embodiment of the present invention;
fig. 4 is a flowchart of a method of determining the stiffness of the vibration isolator in a third embodiment of the present invention;
fig. 5 is a block diagram showing a vibration damping performance analysis apparatus for a vibration damping material according to a fourth embodiment of the present invention;
FIG. 6 is a block diagram of the structure of the determination module of FIG. 5;
fig. 7 is a block diagram showing a vibration damping performance analyzer according to a fourth embodiment of the present invention;
fig. 8 is a block diagram of a fourth computing module in fig. 7.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
These and other aspects of embodiments of the invention will be apparent with reference to the following description and attached drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the ways in which the principles of the embodiments of the invention may be practiced, but it is understood that the scope of the embodiments of the invention is not limited correspondingly. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
The vibration isolation parts such as suspension, rubber bushing, lifting lug and the like in the invention are fixed on the vehicle and connected with the vehicle body or other equipment of the vehicle body. The contact points of the vibration isolators with the vehicle body or with other equipment of the vehicle body are also referred to as mounting points, which can also be understood as connection points, such as a drive-train mounted vibration isolator on a vehicle, on the side mounted on the drive train and on the side mounted on the vehicle body or the frame. The active side of the isolator means the side that is connected to a vibration source, such as an automotive powertrain, and the passive side of the isolator means the side that is remote from the vibration source. The attachment points of the active side of the vibration isolation piece are vibration sources such as mounting points on an automobile power assembly and an engine, the attachment points of the passive side of the vibration isolation piece are mounting points on an automobile body or a frame, and each attachment point can determine a coordinate value in the whole automobile development.
Generally, there are a plurality of vibration isolators for automobiles, and the requirement for vibration isolation rigidity or the requirement for vibration isolation performance of each vibration isolator is different, and the rigidity of the vibration isolator in different directions (specifically, in the directions of x axis, y axis and z axis in three-dimensional coordinate axes) of the same vibration isolator is different from the point mobility of the attachment point on the active side or the attachment point on the east side of the vibration isolator. In the present invention, one direction of the vibration isolation member is selected as an example, and the principle of the embodiment of the present invention will be described. It will be appreciated that other vibration isolators perform substantially the same principle as one attachment point.
Referring to fig. 1, a method for analyzing vibration isolation performance of a vibration isolator according to a first embodiment of the present invention includes steps S11-S14.
Step S11, calculating a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of the attachment point on the active side of the vibration isolator, to obtain a plurality of first sound pressure levels.
Step S12, calculating a sound pressure level corresponding to each of the frequencies in a preset frequency range according to the point mobility of the attachment point on the passive side of the vibration isolator, to obtain a plurality of second sound pressure levels.
In the above steps, the dot mobility is the origin velocity admittance generated by the unit force, and can be obtained by the hammering method. Acting force is applied to the origin, vibration is generated at the origin, speed response is generated, and speed admittance under the action of unit force of the origin can be obtained. In the present embodiment, since the action point and the response point are both attachment points, the attachment points are the origin points. In the present embodiment, an excitation force varying with the frequency is applied to the attachment point on the active side of the vibration isolator, and the point mobility of the attachment point on the active side at each frequency can be calculated. And then, calculating the sound pressure level under each frequency according to the point mobility of the attachment point at the active side, thereby obtaining a plurality of first sound pressure levels. The frequency applied in this embodiment is within a predetermined range, such as 220 to 650 Hz. It will be appreciated that different vibration isolators require different frequency ranges, and that generally only the first sound pressure level need be calculated over the frequency range required by the vibration isolator. The calculation of the second sound pressure level is similar to the calculation of the first sound pressure level and will not be described in detail here.
The point mobility can be obtained by other methods in the prior art, such as calculating the point mobility of the attachment points on the active and passive sides of the vibration isolator at different frequencies by using simulation analysis software. In the case of CAE (Computer Aided Engineering) simulation analysis or test, a unit force is applied to an attachment point, and a velocity admittance response of the attachment point is observed, and a sensor is provided at the attachment point, so that an origin velocity admittance of the attachment point, that is, a point mobility of the attachment point, can be directly read out according to data obtained by the sensor using an acoustic testing device such as LMS, TESTLAB, or lander.
Step S13, calculating a sound pressure level corresponding to each frequency in the preset frequency range according to the stiffness of the vibration isolator, to obtain a plurality of third sound pressure levels.
Step S14, when the difference between each of the plurality of third sound pressure levels and the first sound pressure level corresponding to the frequency and the difference between each of the plurality of third sound pressure levels and the second sound pressure level corresponding to the frequency are both greater than a target vibration isolation amount, determining that the vibration isolation performance of the vibration isolation member is qualified.
The first sound pressure level and the second sound pressure level are sound pressure data of attachment points obtained according to practical experiments, and reflect the sound pressure levels of a vibration source connected with the vibration isolation piece and a frame on an automobile. The third sound pressure level is a sound pressure level calculated based on the rigidity of the vibration isolation member, and reflects the attribute of the vibration isolation member. Difference d of the third sound pressure level and the first sound pressure level at each frequency1,fComprises the following steps:
d1,f＝SPL3,f-SPL1,f；
wherein, SPL1,fIs a first sound pressure level, SPL, of frequency f3,fIs a third sound pressure level with frequency f, which varies within a preset frequency range. d1,fAlso indicates the amount of vibration isolation of the vibration isolation member with respect to the attachment point on the active side.
Difference d between the third sound pressure level and the point two sound pressure level at each frequency2,fComprises the following steps:
d2,f＝SPL3,f-SPL2,f；
wherein, SPL2,fFor a second sound pressure level of frequency f, SPL3,fIs a third sound pressure level with frequency f, which varies within a preset frequency range. d2,fAlso indicates the amount of vibration isolation of the vibration isolation member with respect to the passive side attachment point.
When d is1,f，d2,fAnd when the vibration isolation amount is greater than the standard vibration isolation amount, determining that the vibration isolation performance of the vibration isolation piece is qualified. In general, for vibration isolators such as suspensions, rubber bushings, and lifting lugs on automobiles, a target vibration isolation amount of 20dB is generally required when evaluating the vibration isolation effect.
In this embodiment, a first sound pressure level and a second sound pressure level are obtained according to the mobility of the attachment points on the active side and the passive side of the vibration isolation member, a third sound pressure level is obtained according to the stiffness of the vibration isolation member, a difference between the third sound pressure level and the first sound pressure level is calculated, and a difference between the third sound pressure level and the first sound pressure level is calculated.
Referring to fig. 2, a method for analyzing vibration isolation performance of a vibration isolator according to a second embodiment of the present invention is shown. Includes steps S21-S28.
Step S21, the stiffness of any one of the vibration isolators in any one direction and the dot mobility of the attachment point on the active side and the electrical mobility of the attachment point on the passive side are acquired. The direction is the x-axis direction or the y-axis direction or the z-axis direction in the space coordinate axes.
Step S22, calculating a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of the attachment point of the active side of the current vibration isolator in the current direction, to obtain a plurality of first sound pressure levels. The first sound pressure level calculation formula is as follows:
Figure BDA0001207476370000081
wherein,
Figure BDA0001207476370000082
the point mobility of the active side of the current vibration isolating piece after normalization treatment, namely the velocity admittance generated under the action of unit force, namely single point mobility, is obtained or tested according to simulation analysisThe bit is m.s-1.N-1。
Step S23, a curve of the first sound pressure level varying with the frequency is drawn to obtain a first sound pressure/frequency curve. As shown by the dotted line in FIG. 3, the first sound pressure varies with the frequency in the range of 0 to 800 Hz.
Step S24, calculating a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of the attachment point on the passive side of the current vibration isolator, to obtain a plurality of second sound pressure levels. The second sound pressure level calculation formula is as follows:
Figure BDA0001207476370000083
wherein,
Figure BDA0001207476370000084
the point mobility of the passive side of the current vibration isolation part after normalization treatment, namely the velocity admittance generated under the action of unit force, which is obtained or tested according to simulation analysis and has the unit of m & s-1·N-1。
And step S25, drawing a curve of the second sound pressure level along with the change of the frequency to obtain a second sound pressure/frequency curve. The second sound pressure/frequency curve is shown as the dashed curve in fig. 3.
Step S26, calculating a sound pressure level corresponding to each frequency in the preset frequency range according to the stiffness of the current vibration isolator, to obtain a plurality of third sound pressure levels. The formula for the third sound pressure level shown is:
Figure BDA0001207476370000085
wherein f is frequency, unit s-1K is the stiffness of the current vibration isolator at frequency f, in units of N.m-1. The first sound pressure level, the second sound pressure level and the third sound pressure level obtained through calculation all require the unit to be uniform.
And step S27, drawing a curve of the value obtained by subtracting the target vibration isolation amount from the third sound pressure level along with the change of the frequency to obtain a target vibration isolation curve. The target vibration isolation amount is, for example, 20dB, and the obtained target vibration isolation curve is shown by a solid line in fig. 3.
And step S28, when the first sound pressure/frequency curve and the second sound pressure/frequency curve are below the target vibration isolation curve, determining that the vibration isolation performance of the current vibration isolation piece is qualified.
The first sound pressure level, the second sound pressure level and the third sound pressure level are all subjected to normalization processing. When the sound pressure/frequency curve of the attachment point of the active side and the passive side is below the target vibration isolation curve, the vibration isolation performance is qualified, and the requirement of the vibration isolation effect is met. In many cases, limited to engineering conditions, for example, when vibration isolation is required to be good, the rigidity may not meet the requirement, and at this time, the target vibration isolation amount is required to be met at the concerned frequency. As shown in fig. 3, when the vibration isolator has a frequency range of 220 to 650Hz and the first sound pressure/frequency curve and the second sound pressure/frequency curve are below the target vibration isolation curve with appropriate stiffness, the vibration isolation performance of the vibration isolator is qualified.
In the embodiment, the vibration isolation amount of each vibration isolation piece and each vibration isolation direction can be checked by setting a macro or a function, and the vibration isolation performance of each vibration isolation piece can be evaluated by combining the target vibration isolation amount of each vibration isolation piece, so that batch processing is realized.
Referring to fig. 4, a method for determining the stiffness of a vibration isolator according to a third embodiment of the present invention includes steps S31-S33.
Step S31, calculating a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of the attachment point on the active side of the vibration isolator, to obtain a plurality of first sound pressure levels.
Step S32, calculating a sound pressure level corresponding to each of the frequencies in a preset frequency range according to the point mobility of the attachment point on the passive side of the vibration isolator, to obtain a plurality of second sound pressure levels.
The second embodiment of the present invention can be referred to as a method for calculating the first sound pressure level and the second sound pressure level, and details thereof are not repeated herein.
Step S33, calculating the stiffness of the vibration isolator according to the first sound pressure levels, the second sound pressure levels, and a target vibration isolation amount.
Further, the step of calculating the stiffness of the vibration isolator according to the first sound pressure levels, the second sound pressure levels and the target vibration isolation amount in the above step includes:
determining a most significant sound pressure level of the first plurality of sound pressure levels and the second plurality of sound pressure levels;
and calculating the rigidity of the vibration isolation piece according to the sum of the sound pressure level with the maximum value and the target vibration isolation amount. The calculation formula of the rigidity k of the vibration isolation piece is as follows:
Figure BDA0001207476370000101
wherein, SPL3＝SPLmax+ Δ d, f denotes frequency, SPLmaxAnd Δ d is a target vibration isolation amount, which is a sound pressure level having a largest value among the plurality of first sound pressure levels and the plurality of second sound pressure levels.
In this embodiment, the rigidity of the vibration isolation member to be designed is unknown, and the sound pressure level of the vibration isolation member satisfying the requirement, that is, the SPL is calculated according to the target vibration isolation amount3. The preset frequency range is the frequency range required by the vibration isolation piece, and the vibration isolation performance requirement in the frequency range is qualified, namely the vibration isolation amount of the active side and the passive side of the vibration isolation piece is required to reach the target vibration isolation amount. The sound pressure level SPL of the vibration isolator can be calculated by determining the sound pressure levels of the attachment points of the active side and the passive side of the vibration isolator, namely a first sound pressure level and a second sound pressure level, and then adding the maximum value of the sound pressure levels of the attachment points of the active side and the passive side of the vibration isolator to a target vibration isolation amount under the same frequency3. And then the rigidity of the vibration isolation piece reaching the target vibration isolation amount can be calculated according to the sound pressure level of the vibration isolation piece, and the vibration isolation piece meeting the requirement is designed according to the calculated rigidity of the vibration isolation piece.
When the rigidity of the vibration isolating member calculated according to the maximum value of the sound pressure levels of the attachment points in the preset frequency range meets the requirement, the rigidity of the vibration isolating member calculated according to the sound pressure levels of the attachment points at any other frequency also meets the requirement necessarily.
In the present embodiment, the rigidity of the vibration isolator that meets the requirement of the target vibration isolation amount is determined according to the sound pressure level of the attachment point on the active or passive side of the vibration isolator, so that a reasonable vibration isolator is designed according to the determined rigidity. The method can realize batch processing of the rigidity calculation of the multiple vibration isolation parts, thereby realizing design guidance of various vibration isolation parts.
In this embodiment, compared with the first embodiment of the present invention, the stiffness of the vibration isolator of the first embodiment is determined, and whether the vibration isolator satisfies the vibration isolation performance is determined, but the stiffness of the vibration isolator of the present embodiment is unknown, and it is necessary to determine the stiffness of the vibration isolator according to the target vibration isolation amount and the sound pressure level of the attachment point on the primary side and the passive side of the vibration isolator.
Referring to fig. 5, an apparatus for analyzing vibration isolation performance of a vibration isolator according to a fourth embodiment of the present invention includes a first calculating module 100, a second calculating module 200, a third calculating module 300, and a determining module 400.
The first calculating module 100 is configured to calculate a sound pressure level corresponding to each frequency in a preset frequency range according to a point mobility of an attachment point on the active side of the vibration isolator, so as to obtain a plurality of first sound pressure levels. The first sound pressure level calculation formula is as follows:
Figure BDA0001207476370000111
wherein,
Figure BDA0001207476370000112
is the point mobility of the active side of the vibration isolation part after normalization treatment, namely the velocity admittance generated under the action of unit force is obtained or tested according to simulation analysis and has the unit of m.s-1.N-1。
The second calculating module 200 is configured to calculate a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of the attachment point on the passive side of the vibration isolator, so as to obtain a plurality of second sound pressure levels. The second sound pressure level calculation formula is as follows:
Figure BDA0001207476370000113
wherein,
Figure BDA0001207476370000114
the point mobility of the passive side of the vibration isolation part after normalization treatment is obtained or tested according to simulation analysis, namely the velocity admittance generated under the action of unit force, and the unit is m.s-1·N-1。
The third calculating module 300 is configured to calculate, according to the stiffness of the vibration isolator, a sound pressure level corresponding to each frequency in the preset frequency range, so as to obtain a plurality of third sound pressure levels. The calculation formula of the third sound pressure is:
Figure BDA0001207476370000115
where f frequency, unit s-1K is the stiffness of the vibration isolator at the corresponding frequency, in N.m-1。
The determining module 400 is configured to determine that the vibration isolation performance of the vibration isolator is qualified when the difference between each of the plurality of third sound pressure levels and the first sound pressure level of the corresponding frequency, and the difference between each of the plurality of third sound pressure levels and the second sound pressure level of the corresponding frequency are both greater than a target vibration isolation amount.
Further, as shown in fig. 6, the determining module 400 includes:
a drawing module 410, configured to draw a curve of the first sound pressure level changing with the frequency to obtain a first sound pressure/frequency curve, draw a curve of the second sound pressure level changing with the frequency to obtain a second sound pressure/frequency curve, and draw a curve of a value obtained by subtracting the target vibration isolation amount from the third sound pressure level changing with the frequency to obtain a target vibration isolation curve;
the determining submodule 420 is configured to determine that the vibration isolation performance of the vibration isolator is qualified when the first sound pressure/frequency curve and the second sound pressure/frequency curve are below the target vibration isolation curve.
And respectively calculating the sound pressure levels of the active side attachment point and the passive side attachment point of the vibration isolation piece according to the first sound pressure level calculation formula and the second sound pressure level calculation formula, and drawing two sound pressure/frequency curves. And calculating a third sound pressure level according to the rigidity of the vibration isolation piece, and drawing a target vibration isolation curve according to the third sound pressure level and the target vibration isolation amount. When the first sound pressure/frequency curve and the second sound pressure/frequency curve are both below the target vibration isolation curve in the frequency range required by the isolation member, the vibration isolation performance of the vibration isolation member in the frequency range is qualified. The vibration isolation performance of the vibration isolation piece can be judged visually through the curve chart.
Referring to fig. 7, a stiffness determining apparatus for a vibration isolator according to a fifth embodiment of the present invention includes:
the first calculation module 100 is configured to calculate a sound pressure level corresponding to each frequency in a preset frequency range according to a point mobility of an attachment point on the active side of the vibration isolator, so as to obtain a plurality of first sound pressure levels;
a second calculating module 200, configured to calculate, according to a point mobility of an attachment point on a passive side of the vibration isolator, a sound pressure level corresponding to each frequency in a preset frequency range, so as to obtain a plurality of second sound pressure levels;
a fourth calculating module 500, configured to calculate the stiffness of the vibration isolator according to the first sound pressure levels, the second sound pressure levels, and a target vibration isolation amount.
Further, as shown in fig. 8, the fourth calculating module 500 includes:
a query module 510, configured to query a highest-valued sound pressure level of the first sound pressure levels and the second sound pressure levels;
and the fourth calculating submodule 520 is used for calculating the rigidity of the vibration isolating piece according to the sum of the sound pressure level with the maximum numerical value and the target vibration isolating amount.
Further, the calculation formula of the rigidity of the vibration isolation member is as follows:
Figure BDA0001207476370000121
wherein, SPL3＝SPLmax+ Δ d, f denotes frequency, SPLmaxAnd Δ d is a target vibration isolation amount, which is a sound pressure level having a largest value among the plurality of first sound pressure levels and the plurality of second sound pressure levels.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A method for analyzing vibration isolation performance of a vibration isolator, comprising:
calculating a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of an attachment point on the driving side of the vibration isolation piece to obtain a plurality of first sound pressure levels, wherein the point mobility is the velocity admittance generated by the attachment point under the action of unit force;
calculating a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of the attachment point on the passive side of the vibration isolation piece to obtain a plurality of second sound pressure levels;
calculating the sound pressure level corresponding to each frequency in the preset frequency range according to the rigidity of the vibration isolation piece to obtain a plurality of third sound pressure levels;
and when the difference value between each of the plurality of third sound pressure levels and the first sound pressure level of the corresponding frequency and the difference value between each of the plurality of third sound pressure levels and the second sound pressure level of the corresponding frequency are both greater than a target vibration isolation amount, determining that the vibration isolation performance of the vibration isolation member is qualified.
2. The vibration isolation performance analysis method according to claim 1, wherein the step of determining that the vibration isolation performance of the vibration isolation member is acceptable when the difference between each of the plurality of third sound pressure levels and the first sound pressure level of the corresponding frequency and the difference between each of the plurality of third sound pressure levels and the second sound pressure level of the corresponding frequency are both greater than a target vibration isolation amount comprises:
drawing a curve of the first sound pressure level changing along with the frequency to obtain a first sound pressure/frequency curve, and drawing a curve of the second sound pressure level changing along with the frequency to obtain a second sound pressure/frequency curve;
drawing a curve of the value obtained by subtracting the target vibration isolation amount from the third sound pressure level along with the change of the frequency to obtain a target vibration isolation curve;
and when the first sound pressure/frequency curve and the second sound pressure/frequency curve are below the target vibration isolation curve, determining that the vibration isolation performance of the vibration isolation piece is qualified.
3. The vibration isolation performance analysis method according to claim 1, wherein the first sound pressure level and the second sound pressure level are calculated by the following formulas:
Figure FDA0002324932760000011
Figure FDA0002324932760000012
wherein,
Figure FDA0002324932760000021
the velocity admittance generated by the attachment point on the active side of the vibration isolator under the action of unit force after normalization treatment,
Figure FDA0002324932760000022
the velocity admittance generated by the passive side attachment point of the vibration isolator under the action of unit force after normalization processing.
4. The vibration isolation performance analysis method according to claim 1, wherein the third sound pressure level is calculated by the formula:
Figure FDA0002324932760000023
where f denotes the frequency, and k is the stiffness of the vibration isolator at the frequency f.
5. A method of determining the stiffness of a vibration isolator, comprising:
calculating a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of an attachment point on the driving side of the vibration isolation piece to obtain a plurality of first sound pressure levels, wherein the point mobility is the velocity admittance generated by the attachment point under the action of unit force;
calculating a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of the attachment point on the passive side of the vibration isolation piece to obtain a plurality of second sound pressure levels;
calculating a stiffness of the vibration isolator based on the first plurality of sound pressure levels, the second plurality of sound pressure levels, and a target vibration isolation amount.
6. The method of determining the stiffness of a vibration isolator according to claim 5, wherein the step of calculating the stiffness of the vibration isolator based on the first plurality of sound pressure levels, the second plurality of sound pressure levels, and a target vibration isolation amount comprises:
determining a most significant sound pressure level of the first plurality of sound pressure levels and the second plurality of sound pressure levels;
and calculating the rigidity of the vibration isolation piece according to the sum of the sound pressure level with the maximum value and the target vibration isolation amount.
7. The method for determining the rigidity of a vibration isolator according to claim 5, wherein the first sound pressure level and the second sound pressure level are calculated by the following formulas:
Figure FDA0002324932760000024
Figure FDA0002324932760000025
wherein,
Figure FDA0002324932760000031
the velocity admittance generated by the attachment point on the active side of the vibration isolator under the action of unit force after normalization treatment,
Figure FDA0002324932760000032
the velocity admittance generated by the passive side attachment point of the vibration isolator under the action of unit force after normalization processing.
8. The method for determining the rigidity of a vibration isolator according to claim 5, wherein the calculation formula of the rigidity of the vibration isolator is:
Figure FDA0002324932760000033
wherein, SPL3＝SPLmax+ Δ d, f denotes frequency, SPLmaxAnd Δ d is a target vibration isolation amount, which is a sound pressure level having a largest value among the plurality of first sound pressure levels and the plurality of second sound pressure levels.
9. An apparatus for analyzing vibration isolation performance of a vibration isolator, comprising:
the first calculation module is used for calculating a sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of an attachment point on the driving side of the vibration isolation piece to obtain a plurality of first sound pressure levels, wherein the point mobility is the velocity admittance generated by the attachment point under the action of unit force;
the second calculation module is used for calculating the sound pressure level corresponding to each frequency in a preset frequency range according to the point mobility of the attachment point on the passive side of the vibration isolation piece to obtain a plurality of second sound pressure levels;
the third calculation module is used for calculating the sound pressure level corresponding to each frequency in the preset frequency range according to the rigidity of the vibration isolation piece to obtain a plurality of third sound pressure levels;
and the determining module is used for determining that the vibration isolation performance of the vibration isolation piece is qualified when the difference value between the plurality of third sound pressure levels and the first sound pressure level of the corresponding frequency and the difference value between the plurality of third sound pressure levels and the second sound pressure level of the corresponding frequency are both larger than a target vibration isolation amount.
10. The vibration isolation performance analysis apparatus according to claim 9, wherein the determination module includes:
the drawing module is used for drawing a curve of the first sound pressure level changing along with the frequency to obtain a first sound pressure/frequency curve, drawing a curve of the second sound pressure level changing along with the frequency to obtain a second sound pressure/frequency curve, and drawing a curve of a value obtained by subtracting the target vibration isolation amount from the third sound pressure level changing along with the frequency to obtain a target vibration isolation curve;
and the determining submodule is used for determining that the vibration isolation performance of the vibration isolation piece is qualified when the first sound pressure/frequency curve and the second sound pressure/frequency curve are below the target vibration isolation curve.
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