Range hood noise analysis processing method, medium and range hood

Abstract

The present application relates to a kind of range hood noise analysis processing method, medium and range hood, collect the current speed of stable operation range hood and the sound pressure signal of preset region in preset time period in range hood, predict the noise sound power level at user ear, in each level of range hood preset vibration transmission path, selected candidate vibration transmission path, calculate the sound pressure level corresponding to each preset region, sound power level and sound power level index quantity, then calculate the vibration transmission path contribution of all candidate vibration transmission path, once sound power level index quantity, vibration transmission path contribution and preset reference value meet the preset risk condition, the structure corresponding to the candidate vibration transmission path with maximum vibration amplitude value in all candidate vibration transmission path is as the structure to be handled of range hood, accurately realize the determination of the main area of noise generated in range hood.

Description

Technical Field

[0001] This invention relates to the field of range hoods, and more particularly to a method for analyzing and processing noise in range hoods, a medium, and a range hood. Background Technology

[0002] Range hoods are a common appliance in kitchens. As their smoke extraction efficiency improves, so does the noise level of range hoods. To reduce noise, passive noise reduction structures are typically installed inside the range hood, given the limitations of its overall structural dimensions.

[0003] However, with the implementation of passive noise reduction structures, the available space for the fan system within the range hood has been continuously reduced. This further decreases the smooth flow of cooking fumes inside the range hood, and the structural dimensions of the fan system are becoming increasingly larger to meet performance requirements such as airflow, thus increasing structural vibration. Furthermore, the obstructed airflow within the range hood leads to inconsistent noise levels under different usage environments, severely impacting the user experience.

[0004] Chinese invention patent application CN114001396A discloses a method for controlling a range hood, including obtaining a first relationship curve between the change in noise level and the change in sound pressure level; obtaining the control sound of the range hood and determining the change in noise level corresponding to the control sound; the control sound representing the sound added to the noise of the range hood; determining the change in sound pressure level corresponding to the control sound based on the change in noise level corresponding to the control sound and the first sound relationship curve; and adjusting the control sound of the range hood based on the change in sound pressure level corresponding to the control sound. This method can determine the change in sound pressure level corresponding to the control sound, evaluate the effect of audio injection into the range hood through the change in sound pressure level corresponding to the control sound, and adjust the control sound of the range hood according to the change in sound pressure level corresponding to the control sound, thereby providing users with a better experience using the range hood.

[0005] However, the range hood control method disclosed in patent application CN114001396A has shortcomings: it cannot accurately determine the main areas where noise is generated inside the range hood, making it difficult to take countermeasures to eliminate range hood noise to the greatest extent. Summary of the Invention

[0006] The first technical problem to be solved by the present invention is to provide a method for analyzing and processing noise in range hoods, which is in contrast to the above-mentioned prior art.

[0007] The second technical problem to be solved by the present invention is to provide a readable storage medium. This readable storage medium stores a computer program, which, when executed by a processor, implements the range hood noise analysis and processing method described in any one of the claims.

[0008] The third technical problem to be solved by the present invention is to provide a range hood. The range hood includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements any of the noise analysis and processing methods for range hoods described above.

[0009] The technical solution adopted by this invention to solve the first technical problem is: a method for analyzing and processing noise in range hoods, characterized in that it includes:

[0010] Step 1: Collect the current speed of the range hood when it is running smoothly at the selected target speed;

[0011] Step 2: Collect the sound pressure signal of the preset area corresponding to the current state of the range hood during the preset time period and the sound pressure signal of the center position area of ​​the range hood buttons;

[0012] Step 3: Detect the distance between the center position of the range hood button and the user near the range hood, and predict the noise power level at the user's ear based on the sound pressure signal in the area of ​​the center position of the range hood button and the distance between the user and the user.

[0013] Step 4: Collect the current vibration amplitude and frequency values ​​of the motor when the range hood is running in its current state;

[0014] Step 5: Compare the collected current vibration amplitude value of the motor with the preset motor vibration amplitude threshold.

[0015] If the current vibration amplitude of the motor is less than the preset motor vibration amplitude threshold, proceed to step 6; otherwise, implement measures corresponding to the abnormal motor vibration.

[0016] Step 6: Obtain the vibration amplitude values ​​of each preset vibration transmission path of the range hood, and select all preset vibration transmission paths whose vibration amplitude values ​​are greater than the current vibration amplitude value of the motor as alternative vibration transmission paths.

[0017] Step 7: Calculate the sound pressure level and sound power level of each preset region based on the sound pressure signals of each preset region, and calculate the index of sound power level of all preset regions.

[0018] Step 8: Calculate the contribution of all alternative vibration transmission paths to the predicted noise power level at the user's ear.

[0019] Step 9: Make judgments based on the obtained sound power level index, vibration transmission path contribution, and preset reference values:

[0020] If all three conditions are met, proceed to step 10; otherwise, implement the measures corresponding to the absence of pre-defined risk.

[0021] Step 10: Select the structure corresponding to the candidate vibration transmission path with the largest vibration amplitude value among all candidate vibration transmission paths as the structure to be processed for the range hood.

[0022] Improved, in the aforementioned range hood noise analysis and processing method, the method for predicting the noise power level at the user's ear near the current range hood in step 3 is as follows:

[0023]

[0024]

[0025]

[0026] Among them, S Wh S represents the predicted noise power level at the user's ear. A Let U be the sound pressure level at the center of the range hood's control panel, U be the power conversion factor based on the user's height, L be the distance between the center of the range hood's control panel and the user, and p be the sound pressure level at the center of the control panel. RMS,A p is the sound pressure level of the area at the center of the control panel on the range hood. ins,A (t) represents the real-time sound pressure signal of the central area of ​​the range hood's buttons at time t within a preset time period T, where p0 is atmospheric pressure.

[0027] In a further improvement, in the aforementioned method for analyzing and processing noise in a range hood, the vibration amplitude value on the nth preset vibration transmission path within the range hood is calculated in step 6 as follows:

[0028]

[0029] Among them, A n (r) represents the vibration amplitude value of the nth preset vibration transmission path on the range hood at rotational speed r, N is the total number of preset vibration transmission paths within the range hood, I is the total number of connection points on the nth preset vibration transmission path, and f n,i (r) represents the vibration frequency at connection point i of the nth stage of the preset vibration transmission path on the range hood at rotational speed r, X n,i (r) represents the vibration displacement at connection point i of the nth preset vibration transmission path on the range hood at rotational speed r.

[0030] Improved, in the above-mentioned range hood noise analysis and processing method, in step 7, the calculation method for the sound pressure level and the corresponding sound power level of each preset area inside the range hood is as follows:

[0031]

[0032]

[0033]

[0034] Among them, S A-m p represents the sound pressure level corresponding to the m-th preset area inside the range hood. RMS,A p represents the sound pressure level of the m-th preset area inside the range hood. ins,A (t) represents the real-time sound pressure signal of the m-th preset area inside the range hood at time t within a preset time period T, where p0 is the atmospheric pressure; S W-m denoted as the sound power level corresponding to the m-th preset area inside the range hood, U is the power conversion coefficient of the user's height, d is the straight-line distance between the sound pressure detection device for detecting the sound pressure signal of the m-th preset area and the center of the button on the range hood, and M is the total number of preset areas inside the range hood.

[0035] Furthermore, in the aforementioned method for analyzing and processing range hood noise, in step 8, the contribution of all candidate vibration transmission paths to the predicted noise power level at the user's ear is calculated as follows:

[0036]

[0037]

[0038]

[0039] Among them, S W-L (r) represents the contribution of all alternative vibration transmission paths to the predicted noise power level at the user's ear. The reference sound power level; Let J be the contribution of the j-th level of the candidate vibration transmission path among all alternative vibration transmission paths to the predicted noise power level at the user's ear, where J is the total number of candidate vibration transmission paths, and U is the power conversion coefficient based on the user's height; R j (r) is the transfer function of the j-th level alternative vibration transmission path, F j F represents the pressure exerted on the j-th alternative vibration transmission path. j-1 h represents the pressure output of the j-1th level alternative vibration transmission path, and h is the straight-line distance between the detection device for detecting vibration signals on the j-th level alternative vibration transmission path and the center of the button on the range hood.

[0040] Furthermore, in the aforementioned method for analyzing and processing range hood noise, the sound power level index is calculated as follows:

[0041] Among them, S W0 The reference sound power level;

[0042] The preset risk condition in step 9 is:

[0043] S W-K (r)-σ*S W-L (r)>S 阈 ; 0 < σ < 1;

[0044] Among them, S W-K (r) is a sound power level index, S W-L (r) represents the contribution of the vibration transmission path, S 阈 This is a preset reference value.

[0045] Preferably, in the range hood noise analysis and processing method, the user's height-to-power conversion coefficient U = 2, and the atmospheric pressure p0 = 2 × 10⁻⁶. -5 pa.

[0046] Improvedly, in the aforementioned range hood noise analysis and processing method, the preset area includes three areas: the range hood air inlet area, the fan system area, and the air outlet area; the range hood has three preset vibration transmission paths; wherein, the first preset vibration transmission path is the transmission path formed between the motor and the motor mounting bracket, the second preset vibration transmission path is the transmission path formed between the motor mounting bracket and the volute rear cover, and the third preset vibration transmission path is the transmission path formed between the volute rear cover and the center of the top rear plate of the entire range hood.

[0047] The technical solution adopted by the present invention to solve the second technical problem is: a readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, it implements any of the above-mentioned methods for analyzing and processing noise in a range hood.

[0048] The technical solution adopted by the present invention to solve the third technical problem is: a range hood, characterized in that it includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements any of the above-mentioned range hood noise analysis and processing methods.

[0049] Compared with the prior art, the advantages of the present invention are as follows: The noise analysis and processing method of the range hood in this invention collects the current rotation speed of the range hood during stable operation, the sound pressure signal of the preset area inside the range hood during the preset time period, and the sound pressure signal of the area at the center of the range hood buttons. Then, after detecting the distance between the center of the range hood buttons and the user near the range hood, it predicts the noise power level at the user's ear. When the current vibration amplitude value of the motor is less than the preset motor vibration amplitude threshold, it obtains the vibration amplitude values ​​of the preset vibration transmission paths of each level of the range hood and filters candidate vibration transmission paths, calculating the sound pressure level corresponding to each preset area and... The system calculates the sound power level and the sound power level index of all preset areas. Then, it calculates the vibration transmission path contribution of all candidate vibration transmission paths to the predicted noise sound power level at the user's ear. Once it is determined that the sound power level index, the vibration transmission path contribution, and the preset reference value meet the preset risk conditions, the structure corresponding to the candidate vibration transmission path with the largest vibration amplitude value among all candidate vibration transmission paths is taken as the structure to be treated in the range hood. This enables the determination of the main noise-generating area in the range hood, making it easier to take noise reduction measures to eliminate the noise impact generated by the main area. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the noise analysis and processing method for a range hood in an embodiment of the present invention. Detailed Implementation

[0051] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0052] This embodiment provides a method for analyzing and processing noise from a range hood. Specifically, see [link to relevant documentation]. Figure 1 As shown, the noise analysis and processing method for a range hood in this embodiment includes steps 1 to 10:

[0053] Step 1: Collect the current speed of the range hood when it is running smoothly under the selected target setting; for example, the current speed of the range hood in this embodiment when it is running smoothly under the selected target setting is marked as speed r;

[0054] Step 2: Collect the sound pressure signal of the preset area corresponding to the current state of the range hood during the preset time period and the sound pressure signal of the center position area of ​​the range hood button; where "current state" here means that the range hood is in a stable operating state at the target gear mentioned in Step 1, and its speed is the current speed collected.

[0055] According to actual needs, in this embodiment, the preset area here includes three areas, namely the range hood air inlet area, the fan system area and the air outlet area;

[0056] Step 3: Detect the distance between the center of the range hood buttons and the user's location near the range hood, and predict the noise power level at the user's ear based on the sound pressure signal in the area between this distance and the center of the range hood buttons. In this embodiment, the distance between the center of the range hood buttons and the user's location near the range hood is denoted as L, and the noise power level at the user's ear is denoted as S. Wh :

[0057]

[0058]

[0059]

[0060] Among them, S Wh S represents the predicted noise power level at the user's ear. A The sound pressure level is located at the center of the control panel on the range hood, where U is the power conversion factor based on the user's height, preferably U = 2; p RMS,A p is the sound pressure level of the area at the center of the control panel on the range hood. ins,A (t) represents the real-time sound pressure signal at time t within a preset time period T at the center of the range hood's buttons, where p0 is atmospheric pressure; p0 = 2 × 10⁻⁶. -5 pa;

[0061] Step 4: Collect the current vibration amplitude and frequency values ​​of the motor when the range hood is running in its current state;

[0062] Step 5: Compare the collected current vibration amplitude value of the motor with the preset motor vibration amplitude threshold.

[0063] If the current vibration amplitude of the motor is less than the preset motor vibration amplitude threshold, proceed to step 6; otherwise, implement the measures corresponding to the abnormal motor vibration; for example, the measures corresponding to the abnormal motor vibration here are motor vibration abnormality alarm prompts.

[0064] Step 6: Obtain the vibration amplitude values ​​of each preset vibration transmission path of the range hood, and select all preset vibration transmission paths whose vibration amplitude values ​​are greater than the current vibration amplitude value of the motor as candidate vibration transmission paths; wherein, in this embodiment, it is assumed that the total number of preset vibration transmission paths in the range hood is N, and the vibration amplitude value of the nth preset vibration transmission path in the range hood is calculated as follows:

[0065]

[0066] Among them, A n(r) represents the vibration amplitude value of the nth preset vibration transmission path on the range hood at rotational speed r, I is the total number of connection points on the nth preset vibration transmission path, and f n,i (r) represents the vibration frequency at connection point i of the nth stage of the preset vibration transmission path on the range hood at rotational speed r, X n,i (r) represents the vibration displacement at connection point i of the nth preset vibration transmission path on the range hood at rotational speed r; here, the connection point refers to the point located at the interface between two components.

[0067] For example, in this embodiment, the range hood has three preset vibration transmission paths; wherein, the first preset vibration transmission path is the transmission path formed between the motor and the motor mounting bracket, the second preset vibration transmission path is the transmission path formed between the motor mounting bracket and the volute rear cover, and the third preset vibration transmission path is the transmission path formed between the volute rear cover and the center of the top rear plate of the entire range hood.

[0068] Step 7: Calculate the sound pressure level and corresponding sound power level of each preset area based on the obtained sound pressure signals of each preset area, and calculate the sound power level index representing all preset areas; the calculation method for the sound pressure level and corresponding sound power level of each preset area inside the range hood is as follows:

[0069]

[0070]

[0071]

[0072] Among them, S A-m p represents the sound pressure level corresponding to the m-th preset area inside the range hood. RMS,A p represents the sound pressure level of the m-th preset area inside the range hood. ins,A (t) represents the real-time sound pressure signal of the m-th preset area inside the range hood at time t within a preset time period T, where p0 is the atmospheric pressure; S W-m denoted as the sound power level corresponding to the m-th preset area inside the range hood, U is the power conversion coefficient of the user's height, d is the straight-line distance between the sound pressure detection device for detecting the sound pressure signal of the m-th preset area and the center of the button on the range hood, and M is the total number of preset areas inside the range hood.

[0073] The sound power level parameters are calculated as follows:

[0074] in, The reference sound power level;

[0075] Step 8: Calculate the contribution of all alternative vibration transmission paths to the predicted noise power level at the user's ear.

[0076] Step 9: Make judgments based on the obtained sound power level index, vibration transmission path contribution, and preset reference values:

[0077] If all three conditions are met, proceed to step 10; otherwise, implement the measures corresponding to the absence of preset risk. For example, the measure corresponding to the absence of preset risk here is to proceed to step 1.

[0078] Step 10: Select the structure corresponding to the candidate vibration transmission path with the largest vibration amplitude value among all candidate vibration transmission paths as the structure to be treated for the range hood. For example, the structure to be treated for the range hood can be cleaned or replaced.

[0079] In this embodiment, the contribution of all candidate vibration transmission paths to the predicted noise power level at the user's ear is calculated in step 8 as follows:

[0080]

[0081]

[0082]

[0083] Among them, S W-L (r) represents the contribution of all alternative vibration transmission paths to the predicted noise power level at the user's ear. For example, setting this reference sound power level. Located between 0 and 20 dB; Let J be the contribution of the j-th level of the candidate vibration transmission path among all alternative vibration transmission paths to the predicted noise power level at the user's ear, where J is the total number of candidate vibration transmission paths, and U is the power conversion coefficient based on the user's height; R j (r) is the transfer function of the j-th level alternative vibration transmission path, F j F represents the pressure exerted on the j-th alternative vibration transmission path. j-1 The pressure output by the (j-1)th alternative vibration transmission path is h, which is the straight-line distance between the detection device for detecting the vibration signal on the j-th alternative vibration transmission path and the center of the button on the range hood; in this embodiment, the transfer function R j The functional form of (r) can be:

[0084] In step 9 above, the preset risk conditions are set as follows:

[0085] S W-K (r)-σ*S W-L (r)>S 阈 ; 0 < σ < 1;

[0086] Among them, S W-K (r) is a sound power level index, S W-L (r) represents the contribution of the vibration transmission path, S 阈 This is a preset reference value. The value σ here can be set according to actual needs. For example, in this embodiment, σ is set to 50%. That is, once the obtained sound power level index and vibration transmission path contribution meet the preset risk condition with the preset reference value, it indicates that the current vibration transmission path contribution exceeds the threshold, and there is a risk of structural resonance, requiring a transition to step 10.

[0087] This embodiment provides a readable storage medium. The readable storage medium stores a computer program, which, when executed by a processor, implements the range hood noise analysis and processing method of this embodiment.

[0088] This embodiment provides a range hood. The range hood includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the range hood noise analysis and processing method of this embodiment.

[0089] Although preferred embodiments of the present invention have been described in detail above, it should be clearly understood that various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for analyzing and processing noise in range hoods, characterized in that, include: Step 1: Collect the current speed of the range hood when it is running smoothly at the selected target setting; Step 2: Collect the sound pressure signal of the preset area corresponding to the current state of the range hood during the preset time period and the sound pressure signal of the center position area of ​​the range hood buttons; Step 3: Detect the distance between the center position of the range hood button and the user near the range hood, and predict the noise power level at the user's ear based on the sound pressure signal in the area of ​​the center position of the range hood button and the distance between the user and the user. Step 4: Collect the current vibration amplitude and frequency values ​​of the motor when the range hood is running in its current state; Step 5: Compare the collected current vibration amplitude value of the motor with the preset motor vibration amplitude threshold. If the current vibration amplitude of the motor is less than the preset motor vibration amplitude threshold, proceed to step 6; otherwise, implement measures corresponding to the abnormal motor vibration. Step 6: Obtain the vibration amplitude values ​​of each preset vibration transmission path of the range hood, and select all preset vibration transmission paths whose vibration amplitude values ​​are greater than the current vibration amplitude value of the motor as alternative vibration transmission paths. Step 7: Calculate the sound pressure level and sound power level of each preset region based on the sound pressure signals of each preset region, and calculate the index of sound power level of all preset regions. Step 8: Calculate the contribution of all alternative vibration transmission paths to the predicted noise power level at the user's ear. Step 9: Make a judgment based on the obtained sound power level index, vibration transmission path contribution and preset reference value: when the three meet the preset risk conditions, proceed to step 10. Otherwise, implement measures corresponding to the absence of pre-set risks; Step 10: Select the structure corresponding to the candidate vibration transmission path with the largest vibration amplitude value among all candidate vibration transmission paths as the structure to be processed for the range hood.

2. The method for analyzing and processing noise in a range hood according to claim 1, characterized in that, The preset area includes three areas: the range hood air inlet area, the fan system area, and the air outlet area; the range hood has three preset vibration transmission paths; wherein, the first preset vibration transmission path is the transmission path formed between the motor and the motor mounting bracket, the second preset vibration transmission path is the transmission path formed between the motor mounting bracket and the volute rear cover, and the third preset vibration transmission path is the transmission path formed between the volute rear cover and the center of the top rear plate of the entire range hood.

3. A readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the range hood noise analysis and processing method as described in claim 1 or 2.

4. A range hood, characterized in that, The method includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the range hood noise analysis and processing method according to claim 1 or 2.

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