CN113139315A - Method for evaluating vibration noise of variable frequency air conditioner pipeline - Google Patents
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Abstract
The invention relates to the field of air conditioner noise, in particular to a method for evaluating vibration noise of a variable frequency air conditioner pipeline, which realizes accurate and effective evaluation of the noise of the variable frequency air conditioner pipeline, reduces the trial and error times of pipeline design, improves the success rate of design, and effectively reduces the research and development cost and period of the variable frequency air conditioner pipeline. The technical scheme is summarized as follows: acquiring a noise radiation curve of a variable frequency air conditioner pipeline; calculating the total noise radiation energy, the number of peak points of a noise curve, the maximum peak value of the noise curve and the mean square error of the noise curve according to the noise radiation curve of the variable frequency air conditioner pipeline; respectively scoring the noise of the variable frequency air conditioner pipeline according to the total noise radiation energy, the number of peak points of the noise curve, the maximum value of the peak value of the noise curve and the mean square error of the noise curve; carrying out weighted calculation on each score to obtain a total score of the noise of the variable frequency air conditioner pipeline; and evaluating the noise of the variable frequency air conditioner pipeline according to the total noise score of the variable frequency air conditioner pipeline. The method is suitable for evaluating the vibration noise of the variable frequency air conditioner pipeline.
Description
Technical Field
The invention relates to the field of air conditioner noise, in particular to a method for evaluating vibration noise of a variable frequency air conditioner pipeline.
Background
The evaluation of compressor pipeline noise in the development process of variable frequency air conditioner products is a big problem faced by the industry. Because the frequency conversion compressor vibration source has a plurality of working frequency points and a wide range, and the refrigeration system has a complex pipeline structure and low rigidity, the natural frequency of the pipeline system is low and more, and the pipeline system is excited to vibrate in the working process of the frequency conversion compressor, so that the noise problem is generated. The strength of noise radiation of the air conditioner pipeline is related to the excitation magnitude of a compressor, the system pressure, the air conditioner running frequency, the quality of pipeline design and the like, wherein the pipeline design has a large influence on the noise of the air conditioner system, if the pipeline system is reasonably designed, the pipeline vibration is small, the noise radiation intensity is low, and otherwise, a large noise problem is caused. At present, an effective evaluation method for the pipeline noise problem is not formed in the industry, the noise condition of a pipeline design scheme cannot be predicted, noise testing is generally performed based on a prototype, and test means are taken as main means, so that the problems of multiple pipeline design trial and error times, long development period, high research and development cost and the like are caused.
Disclosure of Invention
The invention aims to provide a method for evaluating vibration noise of a variable frequency air conditioner pipeline, which realizes accurate and effective evaluation of noise of the variable frequency air conditioner pipeline, reduces the trial and error times of pipeline design, improves the success rate of design, and effectively reduces the research and development cost and period of the variable frequency air conditioner pipeline.
The invention adopts the following technical scheme to realize the purpose, and the method for evaluating the vibration noise of the variable frequency air conditioner pipeline comprises the following steps:
step 2, calculating total noise radiation energy, the number of peak points of a noise curve, the maximum value of the peak value of the noise curve and the mean square error of the noise curve according to the noise radiation curve of the variable frequency air conditioner pipeline;
step 3, scoring the noise of the variable frequency air conditioner pipeline according to the total noise radiation energy, the number of peak points of the noise curve, the maximum value of the peak value of the noise curve and the mean square deviation of the noise curve;
step 4, carrying out weighted calculation on each score to obtain a total noise score of the variable frequency air conditioner pipeline;
and 5, evaluating the noise of the variable frequency air conditioner pipeline according to the total noise score of the variable frequency air conditioner pipeline.
Further, in step 1, the specific method for obtaining the noise radiation curve of the variable frequency air conditioner pipeline includes:
step 101, obtaining vibration load of a variable frequency air conditioner compressor at each frequency point;
102, loading a vibration load of the variable frequency air conditioner compressor at each frequency point to an air conditioner pipeline finite element simulation model for simulation calculation to obtain a finite element simulation result;
103, comparing the finite element simulation result with a test result, verifying the accuracy of simulation, and debugging the finite element simulation calculation model if the simulation result is not credible until the simulation result is credible;
and 104, loading the finite element simulation result into a noise radiation rapid prediction model to obtain a noise radiation curve of the variable frequency air conditioner pipeline.
Further, in step 2, the method for calculating the total energy of the noise radiation includes: and carrying out integral calculation on the noise curve to obtain the total area of the noise curve, wherein the total area of the noise curve is used as the total noise radiation energy.
Further, in step 3, the specific method for scoring the noise of the variable frequency air conditioner pipeline according to the total noise radiation energy comprises the following steps:
counting the total noise radiation energy of the existing variable frequency air conditioner pipeline to obtain a distribution interval of the total noise radiation energy of the existing variable frequency air conditioner pipeline, wherein the distribution interval is represented as [ Sa, Sb ], and Sa and Sb respectively represent the total noise radiation energy of the variable frequency air conditioner pipeline;
and comparing the calculated total noise radiation energy with the distribution interval of the total noise radiation energy of the existing variable frequency air conditioner pipeline, and grading the noise of the variable frequency air conditioner pipeline according to the comparison result.
The specific method for scoring the noise of the variable frequency air conditioner pipeline according to the comparison result comprises the following steps:
the calculated total noise radiation energy is recorded as S; if S is greater than Sb, the score is 0; if S is less than Sa, the score is 100; if Sa is less than or equal to S and less than or equal to Sb, the calculation formula of the score is as follows: 100 × (Sb-S)/(Sb-Sa).
Further, in step 3, the specific method for scoring the noise of the variable frequency air conditioner pipeline according to the total noise radiation energy further includes:
dividing the whole noise frequency section of the variable frequency air conditioner into a plurality of sections, wherein different sections correspond to different weight coefficients; respectively weighting and calculating the total noise radiation energy of each interval;
and scoring the noise of the variable frequency air conditioner pipeline according to the total noise radiation energy of each interval.
Further, in step 3, the specific method for scoring the noise of the variable frequency air conditioner pipeline according to the number of the noise curve peak points includes:
counting the number of peak points of the noise curve of the existing variable frequency air conditioner pipeline to obtain a distribution interval of the number of the peak points of the noise curve of the existing variable frequency air conditioner pipeline, wherein the distribution interval is represented as [ Na, Nb ], and Na and Nb respectively represent the number of the peak points of the noise curve of the variable frequency air conditioner pipeline;
and comparing the calculated number of the noise curve peak points with the distribution interval of the number of the noise curve peak points of the existing variable frequency air conditioner pipeline, and grading the noise of the variable frequency air conditioner pipeline according to the comparison result.
The specific method for scoring the noise of the variable frequency air conditioner pipeline according to the comparison result comprises the following steps:
the number of the calculated noise curve peak points is recorded as N, and if N is less than Na, the score is 100; if N is more than Nb, the score is 0; if Na is less than or equal to N and less than or equal to Nb, the calculation formula of the score is as follows: 100 x (10-N)/10.
Further, in step 3, the specific method for scoring the noise of the variable frequency air conditioner pipeline according to the number of the noise curve peak points further includes:
and setting corresponding scores and weight coefficients according to the number of the peak points of the different noise curves, and performing weighting calculation to obtain the scores corresponding to the number of the peak points of the noise curves.
Further, in step 3, the method for scoring the noise of the variable frequency air conditioner pipeline according to the maximum value of the noise curve peak value and the noise curve mean square error comprises the following steps:
and respectively comparing the maximum value of the peak value of the noise curve and the mean square error of the noise curve with corresponding threshold values, and grading the noise of the variable frequency air conditioner pipeline according to the comparison result.
The method is based on the noise radiation curve related parameters of the variable frequency air conditioner pipeline, such as total noise radiation energy, the number of peak points of the noise curve, the maximum value of the peak value of the noise curve and the mean square error of the noise curve; scoring the noise of the variable frequency air conditioner pipeline according to the total noise radiation energy, the number of peak points of the noise curve, the maximum value of the peak value of the noise curve and the mean square error of the noise curve, and finally performing weighted calculation to obtain the total noise score of the variable frequency air conditioner pipeline; the grading of multiple dimensions is integrated, so that the noise of the air conditioner pipeline is accurately and effectively evaluated, the number of times of trial and error of the pipeline design is reduced, the design success rate is improved, and the research and development cost and the period of the variable frequency air conditioner pipeline are effectively reduced.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
FIG. 2 is a schematic diagram of a noise radiation curve of a variable frequency air conditioner pipeline according to the present invention.
Detailed Description
The invention discloses a method for evaluating vibration noise of a variable frequency air conditioner pipeline, which has a flow chart shown in figure 1 and comprises the following steps:
s1, acquiring a noise radiation curve of the variable frequency air conditioner pipeline;
s2, calculating the total noise radiation energy, the number of peak points of the noise curve, the maximum peak value of the noise curve and the mean square error of the noise curve according to the noise radiation curve of the variable frequency air conditioner pipeline;
s3, scoring the noises of the variable frequency air conditioner pipeline according to the total noise radiation energy, the number of noise curve peak points, the maximum noise curve peak value and the noise curve mean square deviation;
s4, carrying out weighted calculation on each score to obtain a total score of the noise of the variable frequency air conditioner pipeline;
and S5, evaluating the noise of the variable frequency air conditioner pipeline according to the total noise score of the variable frequency air conditioner pipeline.
In step S1, the specific method for obtaining the noise radiation curve of the variable frequency air conditioner pipeline includes:
step 101, obtaining vibration load of a variable frequency air conditioner compressor at each frequency point;
102, loading a vibration load of the variable frequency air conditioner compressor at each frequency point to an air conditioner pipeline finite element simulation model for simulation calculation to obtain a finite element simulation result;
103, comparing the finite element simulation result with a test result, verifying the accuracy of simulation, and debugging the finite element simulation calculation model if the simulation result is not credible until the simulation result is credible;
and 104, loading the finite element simulation result into a noise radiation rapid prediction model to obtain a noise radiation curve of the variable frequency air conditioner pipeline.
In step 104, the method for building the noise radiation fast prediction model includes:
step 401, obtaining vibration load of the variable frequency air conditioner compressor at each frequency point;
step 402, loading the vibration load of the variable frequency air conditioner compressor at each frequency point to an air conditioner pipeline finite element simulation model for simulation calculation to obtain a finite element simulation result;
step 403, performing benchmarking on the finite element simulation result and the test result, verifying the accuracy of simulation, and debugging the finite element simulation calculation model if the simulation result is not credible until the simulation result is credible;
step 404, importing the finite element simulation result which is accurately verified into professional noise simulation software for acoustic simulation calculation, aligning the simulation result with a noise test, verifying the accuracy of the acoustic simulation, and debugging an acoustic simulation calculation model if the simulation result is not credible until the simulation result is credible;
step 405, obtaining a simulation sample data set of the pipeline vibration signals and the noise radiation values at each frequency point, compiling a noise radiation calculation program based on the sample data set, and establishing a noise radiation rapid prediction model.
The noise radiation curve of the pipeline of the inverter air conditioner is shown in fig. 2, and the calculation parameters comprise a minimum frequency of 10HZ, a maximum frequency of 400HZ and the like.
In step S2, the method for calculating the total energy of noise radiation includes: and carrying out integral calculation on the noise curve to obtain the total area of the noise curve, wherein the total area of the noise curve is used as the total noise radiation energy.
In step S3, the specific method for scoring the variable frequency air conditioner pipeline noise according to the total noise radiation energy includes:
counting the total noise radiation energy of the existing variable frequency air conditioner pipeline to obtain a distribution interval of the total noise radiation energy of the existing variable frequency air conditioner pipeline, wherein the distribution interval is represented as [ Sa, Sb ], and Sa and Sb respectively represent the total noise radiation energy of the variable frequency air conditioner pipeline;
and comparing the calculated total noise radiation energy with the distribution interval of the total noise radiation energy of the existing variable frequency air conditioner pipeline, and grading the noise of the variable frequency air conditioner pipeline according to the comparison result.
The specific method for scoring the noise of the variable frequency air conditioner pipeline according to the comparison result comprises the following steps:
the calculated total noise radiation energy is recorded as S; if S is greater than Sb, the score is 0; if S is less than Sa, the score is 100; if Sa is less than or equal to S and less than or equal to Sb, the calculation formula of the score is as follows: 100 × (Sb-S)/(Sb-Sa).
In step S3, the specific method for scoring the noise of the variable frequency air conditioner pipeline according to the total noise radiation energy further includes:
dividing the whole noise frequency section of the variable frequency air conditioner into a plurality of sections, wherein different sections correspond to different weight coefficients; respectively weighting and calculating the total noise radiation energy of each interval;
and scoring the noise of the variable frequency air conditioner pipeline according to the total noise radiation energy of each interval.
For example, the whole noise frequency band (0-400Hz) is divided into a plurality of intervals, the total noise radiation energy of each interval is calculated respectively, and the weighting coefficients of different frequency bands are different. For example, the total energy of noise radiation at 0-100Hz is S1, and the weight coefficient is K1; the total energy of the 100-200Hz noise radiation is S2, and the weight coefficient is K2; the total energy of the noise radiation at 200-300Hz is S3, and the weight coefficient is K3; the total energy of the noise radiation at 300-400Hz is S4, the weighting coefficient is K4, and the weighting calculation is used for scoring.
In step S3, the specific method for scoring the noise of the variable frequency air conditioner pipeline according to the number of the noise curve peak points includes:
counting the number of peak points of the noise curve of the existing variable frequency air conditioner pipeline to obtain a distribution interval of the number of the peak points of the noise curve of the existing variable frequency air conditioner pipeline, wherein the distribution interval is represented as [ Na, Nb ], and Na and Nb respectively represent the number of the peak points of the noise curve of the variable frequency air conditioner pipeline;
and comparing the calculated number of the noise curve peak points with the distribution interval of the number of the noise curve peak points of the existing variable frequency air conditioner pipeline, and grading the noise of the variable frequency air conditioner pipeline according to the comparison result.
The specific method for scoring the noise of the variable frequency air conditioner pipeline according to the comparison result comprises the following steps:
the number of the calculated noise curve peak points is recorded as N, and if N is less than Na, the score is 100; if N is more than Nb, the score is 0; if Na is less than or equal to N and less than or equal to Nb, the calculation formula of the score is as follows: 100 x (10-N)/10.
In step S3, the specific method for scoring the noise of the variable frequency air conditioner pipeline according to the number of the noise curve peak points further includes:
and setting corresponding scores and weight coefficients according to the number of the peak points of the different noise curves, and performing weighting calculation to obtain the scores corresponding to the number of the peak points of the noise curves.
For example, when the number of peak points greater than the threshold is n and n is 0, the score is 100; when n is more than or equal to 10, scoring 0 point; when n is between 0-10, the score may be scaled by (10-n) × 100/10; the definition of segmentation can also be carried out, such as 90 points are obtained by 1 peak value; 80 points are obtained for 2 peak points; 70 points are obtained for 3 peak points; the score of 50 is obtained for 4 peak points, and the score of 5 is obtained for … … 9 peak points; the final score is a weight coefficient multiplied by the evaluation dimension, and if the peak point number calculation score is 90 points and the peak point number evaluation index weight coefficient is 0.3, the actual score is 0.3 × 90 to 27 points.
In step S3, the method for scoring the noise of the variable frequency air conditioner pipeline according to the maximum value of the noise curve peak and the noise curve mean square error includes:
and respectively comparing the maximum value of the peak value of the noise curve and the mean square error of the noise curve with corresponding threshold values, and grading the noise of the variable frequency air conditioner pipeline according to the comparison result.
The method for scoring the noise of the variable frequency air conditioner pipeline according to the maximum value of the noise curve peak value and the noise curve mean square error can also be the same as the method for scoring the noise of the variable frequency air conditioner pipeline according to the total noise radiation energy or the number of the noise curve peak value points.
The method comprehensively weights the total noise radiation energy, the number of peak points of the noise curve, the maximum value of the peak value of the noise curve and the mean square error of the noise curve to score the noise of the variable frequency air conditioner pipeline, realizes accurate and effective evaluation of the noise of the variable frequency air conditioner pipeline, reduces the trial and error times of the pipeline design, improves the success rate of the design, and effectively reduces the research and development cost and period of the variable frequency air conditioner pipeline.
Claims (10)
1. The method for evaluating the vibration noise of the variable frequency air conditioner pipeline is characterized by comprising the following steps:
step 1, acquiring a noise radiation curve of a variable frequency air conditioner pipeline;
step 2, calculating total noise radiation energy, the number of peak points of a noise curve, the maximum value of the peak value of the noise curve and the mean square error of the noise curve according to the noise radiation curve of the variable frequency air conditioner pipeline;
step 3, scoring the noise of the variable frequency air conditioner pipeline according to the total noise radiation energy, the number of peak points of the noise curve, the maximum value of the peak value of the noise curve and the mean square deviation of the noise curve;
step 4, carrying out weighted calculation on each score to obtain a total noise score of the variable frequency air conditioner pipeline;
and 5, evaluating the noise of the variable frequency air conditioner pipeline according to the total noise score of the variable frequency air conditioner pipeline.
2. The method for evaluating vibration noise of pipelines of an inverter air conditioner according to claim 1, wherein in step 1, the specific method for obtaining the noise radiation curve of the pipelines of the inverter air conditioner comprises the following steps:
step 101, obtaining vibration load of a variable frequency air conditioner compressor at each frequency point;
102, loading a vibration load of the variable frequency air conditioner compressor at each frequency point to an air conditioner pipeline finite element simulation model for simulation calculation to obtain a finite element simulation result;
103, comparing the finite element simulation result with a test result, verifying the accuracy of simulation, and debugging the finite element simulation calculation model if the simulation result is not credible until the simulation result is credible;
and 104, loading the finite element simulation result into a noise radiation rapid prediction model to obtain a noise radiation curve of the variable frequency air conditioner pipeline.
3. The method for evaluating the vibration and noise of the inverter air conditioner pipeline according to claim 2, wherein in the step 2, the method for calculating the total energy of the noise radiation comprises the following steps: and carrying out integral calculation on the noise curve to obtain the total area of the noise curve, wherein the total area of the noise curve is used as the total noise radiation energy.
4. The method for evaluating vibration noise of pipelines of an inverter air conditioner according to claim 3, wherein in the step 3, the specific method for scoring the noises of the pipelines of the inverter air conditioner according to the total noise radiation energy comprises the following steps:
counting the total noise radiation energy of the existing variable frequency air conditioner pipeline to obtain a distribution interval of the total noise radiation energy of the existing variable frequency air conditioner pipeline, wherein the distribution interval is represented as [ Sa, Sb ], and Sa and Sb respectively represent the total noise radiation energy of the variable frequency air conditioner pipeline;
and comparing the calculated total noise radiation energy with the distribution interval of the total noise radiation energy of the existing variable frequency air conditioner pipeline, and grading the noise of the variable frequency air conditioner pipeline according to the comparison result.
5. The method for evaluating vibration noise of pipelines of an inverter air conditioner according to claim 4, wherein the specific method for scoring the noise of the pipelines of the inverter air conditioner according to the comparison result comprises the following steps:
the calculated total noise radiation energy is recorded as S; if S is greater than Sb, the score is 0; if S is less than Sa, the score is 100; if Sa is less than or equal to S and less than or equal to Sb, the calculation formula of the score is as follows: 100 × (Sb-S)/(Sb-Sa).
6. The method for evaluating vibration noise of pipelines of an inverter air conditioner according to claim 3, wherein in the step 3, the specific method for scoring the noises of the pipelines of the inverter air conditioner according to the total noise radiation energy further comprises the following steps:
dividing the whole noise frequency section of the variable frequency air conditioner into a plurality of sections, wherein different sections correspond to different weight coefficients; respectively weighting and calculating the total noise radiation energy of each interval;
and scoring the noise of the variable frequency air conditioner pipeline according to the total noise radiation energy of each interval.
7. The method for evaluating the vibration noise of the inverter air conditioner pipeline according to claim 2, wherein in the step 3, the specific method for scoring the noise of the inverter air conditioner pipeline according to the number of the peak points of the noise curve comprises the following steps:
counting the number of peak points of the noise curve of the existing variable frequency air conditioner pipeline to obtain a distribution interval of the number of the peak points of the noise curve of the existing variable frequency air conditioner pipeline, wherein the distribution interval is represented as [ Na, Nb ], and Na and Nb respectively represent the number of the peak points of the noise curve of the variable frequency air conditioner pipeline;
and comparing the calculated number of the noise curve peak points with the distribution interval of the number of the noise curve peak points of the existing variable frequency air conditioner pipeline, and grading the noise of the variable frequency air conditioner pipeline according to the comparison result.
8. The method for evaluating vibration noise of pipelines of an inverter air conditioner according to claim 7, wherein the specific method for scoring the noise of the pipelines of the inverter air conditioner according to the comparison result comprises the following steps:
the number of the calculated noise curve peak points is recorded as N, and if N is less than Na, the score is 100; if N is more than Nb, the score is 0; if Na is less than or equal to N and less than or equal to Nb, the calculation formula of the score is as follows: 100 x (10-N)/10.
9. The method for evaluating vibration noise of pipelines of inverter air conditioners according to claim 2, wherein in step 3, the specific method for scoring the noises of the pipelines of inverter air conditioners according to the number of peak points of the noise curve further comprises:
and setting corresponding scores and weight coefficients according to the number of the peak points of the different noise curves, and performing weighting calculation to obtain the scores corresponding to the number of the peak points of the noise curves.
10. The method for evaluating vibration noise of pipelines of inverter air conditioners according to claim 2, wherein in the step 3, the method for scoring the noises of the pipelines of inverter air conditioners according to the maximum value of the peak value of the noise curve and the mean square deviation of the noise curve comprises the following steps:
and respectively comparing the maximum value of the peak value of the noise curve and the mean square error of the noise curve with corresponding threshold values, and grading the noise of the variable frequency air conditioner pipeline according to the comparison result.
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