CN109631172B - Air conditioner vibration reduction method and system - Google Patents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/08—Compressors specially adapted for separate outdoor units
- F24F1/12—Vibration or noise prevention thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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Abstract
The invention discloses an air conditioner vibration reduction method and system, which comprises the steps of obtaining a compressor vibration frequency spectrum; judging whether the sum of the vibration energy of the first m orders of the vibration frequency spectrum/the total vibration energy is larger than or equal to a first set ratio or not; if not, adding 1 to m; if so, determining the mode of each order of vibration, which accounts for the contribution of the second set ratio to the vibration, in the first m orders of the vibration spectrum as the mode corresponding to each order of vibration; for each set of preselected connection points: respectively applying a mode corresponding to each order of vibration in m orders before a vibration frequency spectrum, acquiring a vibration response generated by each order of vibration in a response area, and superposing the vibration responses generated by the vibration of the m orders before in the response area to obtain the resultant vibration generated by each group of preselected connection points in the response area; comparing the magnitude of the resultant vibration generated by each group of preselected connection points in the response area to obtain the minimum value, wherein the group of preselected connection points corresponding to the minimum value is the optimal group of connection points, and the compressor is connected with the optimal group of connection points; the vibration noise of the air conditioner shell caused by the vibration of the compressor is reduced.
Description
Technical Field
The invention belongs to the technical field of vibration reduction, and particularly relates to a vibration reduction method and system for an air conditioner.
Background
The problem of shell vibration noise caused by the transmission of compressor vibration to the air conditioner chassis is one of the key points of air conditioner vibration noise research. However, the optimization of the position of the connection point between the compressor and the chassis is less mainly from the viewpoint of optimizing vibration isolation, excitation at different positions can cause different responses, and unreasonable connection arrangement can cause more obvious vibration noise problems.
Disclosure of Invention
The invention provides an air conditioner vibration reduction method, which reduces vibration noise of an air conditioner shell caused by vibration of a compressor.
In order to solve the technical problems, the invention adopts the following technical scheme:
a vibration reduction method for an air conditioner is characterized in that a compressor of the air conditioner is installed on a base plate, the base plate comprises an excitation area and a response area, and the excitation area comprises a plurality of groups of preselected connecting points; the method comprises the following steps:
(1) obtaining a vibration frequency spectrum of the compressor;
(2) judging whether the sum of the vibration energy of the first m orders of the vibration frequency spectrum/the total vibration energy is larger than or equal to a first set ratio or not;
if not, executing the step (3): adding 1 to m, and returning to the step (2);
if yes, executing the following steps:
(4) determining the mode of each order of vibration, which accounts for the contribution of the second set ratio to the vibration, in the first m orders of the vibration spectrum as the mode corresponding to each order of vibration;
(5) for each set of preselected connection points: respectively applying a mode corresponding to each order of vibration in m orders before a vibration frequency spectrum, then obtaining the vibration response generated by each order of vibration in a response area, and superposing the vibration responses generated by the vibration of the m orders before in the response area, thereby obtaining the resultant vibration generated by each group of preselected connection points in the response area;
(6) and comparing the magnitude of the resultant vibration generated in the response region by each group of the preselected connection points to obtain the minimum value, wherein the group of the preselected connection points corresponding to the minimum value is the optimal group of connection points, and the compressor is connected with the optimal group of connection points.
Further, the step (4) specifically comprises:
(41) calculating the upper limit of the set frequency of each vibration in the previous m orders: fdi ═ P × Fi;
fi is the frequency of the ith order vibration of the vibration frequency spectrum, and Fdi is the set upper frequency limit of the ith order vibration; i is 1,2, … …, m; p is more than 1 and less than 2;
(42) selecting a mode with a modal frequency less than or equal to the set upper frequency limit of the first m-order vibration, calculating modal participation factors of the selected mode of each order vibration, and calculating the sum of the modal participation factors of all the modes selected by each order vibration;
(43) sorting the modal participation factors of all the modes selected by each order of vibration from large to small;
(44) judging whether the sum of the first k modal participation factors/the sum of the modal participation factors of all the modes selected by the order of vibration is larger than or equal to a second set ratio or not in each order of vibration;
if not, executing the step (45): k is added by 1 and returns to the step (44);
if so, determining that the mode which accounts for the contribution of the second set ratio to the vibration in the order of vibration is the mode corresponding to the first k mode participation factors, and taking the mode as the mode corresponding to the order of vibration.
Still further, the step (5) specifically includes:
(51) gridding the response area, wherein nodes of the grid are used as detection points of the vibration response;
(52) respectively applying a mode corresponding to each order of vibration in the previous m orders to the selected group of preselected connection points;
respectively acquiring the vibration response of each order of vibration generated at the detection points at each detection point, and superposing the vibration response of each order of vibration of the previous m orders at the detection points, thereby obtaining the resultant vibration generated by the group of preselected connection points at each detection point;
superposing the resultant vibration generated by the group of preselected connection points at each detection point to obtain the resultant vibration generated by the group of preselected connection points in the response area;
(53) and (4) traversing all groups of preselected connection points of the selected excitation area, and repeatedly executing the step (52), thereby obtaining the resultant vibration generated by each group of preselected connection points in the response area.
Still further, the method further comprises: gridding the excitation area; the nodes of the grid are selected according to the bottom structure of the compressor, and a plurality of groups of preselected connection points are selected.
Further, the first set ratio is 90%.
Still further, the second set ratio is 90%.
Further, P is 1.2.
Based on the design of the air conditioner vibration reduction method, the invention also provides an air conditioner vibration reduction system, wherein a compressor of the air conditioner is arranged on a chassis, the chassis comprises an excitation area and a response area, and the excitation area comprises a plurality of groups of preselected connection points; the system comprises: the acquisition module is used for acquiring a compressor vibration frequency spectrum; the judging module is used for judging whether the sum of the vibration energy of the first m orders of the vibration frequency spectrum/the total vibration energy is larger than or equal to a first set ratio; if not, adding 1 to m; the mode determining module is used for determining a mode which accounts for the contribution of the vibration in a second set ratio in the first m orders of the vibration frequency spectrum and is used as a mode corresponding to each order of vibration; a resultant vibration determination module for, for each set of preselected connection points: respectively applying a mode corresponding to each order of vibration in m orders before a vibration frequency spectrum, then obtaining the vibration response generated by each order of vibration in a response area, and superposing the vibration responses generated by the vibration of the m orders before in the response area, thereby obtaining the resultant vibration generated by each group of preselected connection points in the response area; and the comparison module is used for comparing the magnitude of the combined vibration generated by the groups of preselected connection points in the response area to obtain the minimum value, the group of preselected connection points corresponding to the minimum value is the optimal group of connection points, and the compressor is connected with the optimal group of connection points.
Further, the modality determining module specifically includes: a frequency determination unit for calculating a set upper frequency limit for each vibration in the previous m orders: fdi ═ P × Fi; fi is the frequency of the ith order vibration of the vibration frequency spectrum, and Fdi is the set upper frequency limit of the ith order vibration; i is 1,2, … …, m; p is more than 1 and less than 2; the calculation unit is used for selecting the mode with the mode frequency less than or equal to the set frequency upper limit of the order vibration in each order of the first m orders of vibration, calculating the mode participation factor of the mode selected by each order of vibration, and calculating the sum of the mode participation factors of all the modes selected by each order of vibration; the sorting unit is used for sorting the modal participation factors of all the modes selected by each order of vibration from large to small; the judging unit is used for judging whether the sum of the first k modal participation factors/the sum of the modal participation factors of all the modes selected by the order of vibration is larger than or equal to a second set ratio or not in each order of vibration; if not, adding 1 to k; and the mode determining unit is used for determining that the mode which accounts for the contribution of the second set ratio to the vibration in the order of vibration is the mode corresponding to the first k mode participation factors and is used as the mode corresponding to the order of vibration.
Further, the combined vibration determining module specifically includes: the gridding unit is used for gridding the response area, and nodes of the grids are used as detection points of the vibration response; the combined vibration determining unit is used for respectively applying a mode corresponding to each order of vibration in the previous m orders to the selected group of preselected connection points; respectively acquiring the vibration response of each order of vibration generated at the detection points at each detection point, and superposing the vibration response of each order of vibration of the previous m orders at the detection points, thereby obtaining the resultant vibration generated by the group of preselected connection points at each detection point; superposing the resultant vibration generated by the group of preselected connection points at each detection point to obtain the resultant vibration generated by the group of preselected connection points in the response area; and the traversing unit is used for traversing all groups of preselected connection points of the selected excitation area.
Compared with the prior art, the invention has the advantages and positive effects that: according to the air conditioner vibration reduction method and system, the vibration frequency spectrum of the compressor is obtained; judging whether the sum of the vibration energy of the first m orders of the vibration frequency spectrum/the total vibration energy is larger than or equal to a first set ratio or not; if not, adding 1 to m; if so, determining the mode of each order of vibration, which accounts for the contribution of the second set ratio to the vibration, in the first m orders of the vibration frequency spectrum as the mode corresponding to each order of vibration; for each set of preselected connection points: respectively applying a mode corresponding to each order of vibration in m orders before a vibration frequency spectrum, then obtaining the vibration response generated by each order of vibration in a response area, and superposing the vibration responses generated by the vibration of the m orders before in the response area, thereby obtaining the resultant vibration generated by each group of preselected connection points in the response area; comparing the magnitude of the resultant vibration generated by each group of preselected connection points in the response area to obtain the minimum value, wherein the group of preselected connection points corresponding to the minimum value is the optimal group of connection points, and the compressor is connected with the optimal group of connection points; when the compressor is connected to the optimal set of connection points, vibration of the chassis response area is minimized, and thus vibration transmitted to the air conditioning case is also minimized, thereby reducing air conditioning case vibration noise caused by compressor vibration.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a flow chart of an embodiment of a vibration damping method for an air conditioner according to the present invention;
fig. 2 is a schematic structural view of the chassis.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
The compressor of the air conditioner is installed on an air conditioner base plate, and the base plate comprises an excitation area and a response area. The excitation region is a mounting region of the compressor, the mounting region is called an excitation region because vibration of the compressor is firstly transmitted to the mounting region, and the response region is a region on the chassis except the excitation region, and vibration of the response region is caused because the vibration of the excitation region is transmitted to the response region, thereby causing vibration of the air-conditioning shell, as shown in fig. 2.
And gridding the excitation area, selecting nodes of the grid according to the bottom structure of the compressor as preselected connection points, and selecting a plurality of groups of preselected connection points, wherein the excitation area comprises a plurality of groups of preselected connection points. The excitation area is meshed to facilitate finding all preselected connection points. For example, the excitation area has a total of 100 nodes after being gridded, the 100 nodes are all possible positions for connecting with the compressor, if the compressor bottom structure needs three connection points, 3 nodes are selected from the 100 nodes at a time according to the relative position relationship of the three connection points to be used as a group of preliminary connection points, all the nodes are traversed, all the possible preliminary connection points are found out, and therefore multiple groups of preliminary connection points are selected, and each group of preliminary connection points comprises three nodes.
The air conditioner vibration reduction method of the embodiment specifically comprises the following steps, which are shown in fig. 1.
Step S1: and acquiring a compressor vibration frequency spectrum.
The compressor vibration spectrum is typically represented by a two-dimensional graph with frequency on the abscissa and amplitude on the ordinate, one amplitude for each frequency. And the system can be represented by an array [ Fi, Ai ], wherein Fi is the frequency of the ith order vibration, Ai is the amplitude of the ith order vibration, Fi and Ai correspond to Ai in a one-to-one mode, and i is 1,2,3, … … and n. n is the order of the vibration frequency spectrum, and if n is 8, the vibration frequency spectrum has 8 orders of vibration.
Step S2: and judging whether the sum of the vibration energy of the first m orders of the vibration frequency spectrum/the total vibration energy is larger than or equal to a first set ratio. M is more than or equal to 1 and less than or equal to n.
The sum of the vibration energy of the first m orders is
Total vibration energy of
Judgment of
Whether the ratio is larger than or equal to the first set ratio.
If not, go to step S3: m is added by 1 and the step S2 is returned until
The ratio is more than or equal to the first set ratio.
If yes, indicating that the vibration energy corresponding to F1, F2 and … … is already large, the first m-order is the main vibration order, and the rest of the orders can be disregarded, and then the following steps are performed.
For example, if m is 1, and if the above condition is not satisfied when m is 1, then m is added with 1, m is 2, and if m is 2, then m is added with 1, m is 3, and if m is 3, then step S4 is executed downward.
In the present embodiment, the first set ratio is 90%. If the sum of the vibration energy of the first m orders/the total vibration energy is larger than or equal to 90%, the vibration energy of the first m orders accounts for most of the vibration energy, and the rest vibration energy can be not considered so as to avoid the calculation complexity. If the first set ratio is greater than 90%, the calculation may be cumbersome; if the first set ratio is < 90%, then additional vibrational energy may be ignored.
Step S4: and in the first m orders of the vibration frequency spectrum, determining the mode which accounts for the contribution of the second set ratio to the vibration in each order of vibration as the mode corresponding to each order of vibration.
The modal participation factor, also called a modal participation factor matrix, is formed by the product of the transposition of the modal vector and the corresponding scaling factor Q, and is a measure of the effectiveness of each order of modal excitation for each degree of freedom of excitation. Generally speaking, the structure has infinite multi-order modes, when the structure is excited by the outside, the excitation cannot excite all the modes of the structure, but only excites a part of the modes to participate in the response of the structure, and the participation factor reflects which modes participate in the response generated by the excitation force. It is understood that when a force is applied to the structure, many orders of modes are excited, the vibration of the structure is the superposition of all excited modes, and the participation factor is the contribution of each order of mode.
The method specifically comprises the following steps:
step S41: calculating the upper limit of the set frequency of each vibration in the previous m orders: fdi Fi.
Fi is the ith order vibration frequency of the vibration frequency spectrum, and Fdi is the set upper frequency limit of the ith order vibration; i is 1,2, … …, m. P is constant, 1 < P < 2.
In this embodiment, P is 1.2. The method not only avoids the complex calculation caused by excessively large values, but also avoids the main mode omitted when the values are excessively small.
Step S42: selecting the mode of the chassis with the mode frequency less than or equal to the set upper frequency limit of the order vibration in each order of the first m orders of vibration, calculating the mode participation factor of the selected mode of each order of vibration, and calculating the sum of the mode participation factors of all the modes selected by each order of vibration.
The amplitude A corresponding to each order of vibration or each frequency F is formed by superposing a plurality of orders of modal vibration, and each order of modal has a modal participation factor. MPFijA mode engagement factor for a j-th order mode of an i-th order vibration.
Assuming that m is 2, the sum of the vibration energies of the first m orders/total vibration energy is equal to or more than 90%.
The frequency of the 1 st order vibration is 50Hz, Fd1 is 1.2X 50 Hz-60 Hz, and the mode with the mode frequency more than 60Hz has little influence on the order vibration and is not considered; supposing that four-order modes exist in the chassis within the range of the mode frequency less than or equal to 60Hz, namely, the 1 st order mode, the 2 nd order mode, the 3 rd order mode and the 4 th order mode, and the mode participation factors of the four-order modes are respectively as follows: MPF11＝0.3，MPF12＝0.1，MPF13＝0.2，MPF140.05. The sum of the modal engagement factors of all the modes selected by the order vibration is: 0.3+0.1+0.2+0.05 ═ 0.65.
The frequency of the 2 nd order vibration is 60Hz, Fd2 is 1.2X 60 Hz-72 Hz, and the mode frequency is more than 72HzThe state has little influence on the order vibration and is not considered; assuming that five-order modes exist in the chassis within the range of the mode frequency less than or equal to 72Hz, namely, the 1 st order mode, the 2 nd order mode, the 3 rd order mode, the 4 th order mode and the 5 th order mode, and the mode participation factors of the five-order modes are respectively as follows: MPF21＝0.4，MPF22＝0.1，MPF23＝0.2，MPF24＝0.05，MPF250.15. The sum of the modal engagement factors of all the modes selected by the order vibration is: 0.4+0.1+0.2+0.05+0.15 ═ 0.9.
Step S43: and sorting the modal participation factors of all the selected modes of each order of vibration from large to small.
For example, the four modal engagement factors selected for the 1 st order vibration are ranked from large to small as:
MPF11、MPF13、MPF12、MPF14。
the five modal engagement factors selected for the 2 nd order vibration are ranked from large to small as:
MPF21、MPF23、MPF25、MPF22、MPF24。
step S44: and in each order of vibration, judging whether the sum of the first k modal participation factors/the sum of the modal participation factors of all the modes selected by the order of vibration is larger than or equal to a second set ratio.
If not, go to step S45: k is added by 1, and returns to step S44.
If so, determining that the mode which accounts for the contribution of the second set ratio to the vibration in the order of vibration is the mode corresponding to the first k mode participation factors, and taking the mode as the mode corresponding to the order of vibration.
In the present embodiment, the second set ratio is 90%. If the sum of the first k modal participation factors/the sum of all modal participation factors of the selected modal of the order of vibration is larger than or equal to 90%, the mode corresponding to the first k modal participation factors is indicated to have main contribution to the vibration, and the rest can be not considered so as to avoid the calculation complexity. If the second set ratio is greater than 90%, the calculation may be cumbersome; if the second set ratio is < 90%, other modes may be ignored.
k has an initial value of 1 and a maximum value equal to the number of modes selected by the order of vibration.
For example,
in the 1 st order vibration, k is 1, and 1 is not less than k not more than 4.
The sum of the first 1 modal participation factors is 0.3, and 0.462 is 0.3/0.65 and is less than 0.9; then k is added by 1;
the sum of the first 2 modal participation factors is 0.3+ 0.2-0.5, and 0.5/0.65-0.769 < 0.9; then k is added with 1;
the sum of the first 3 modal participation factors is 0.3+0.2+ 0.1-0.6, and 0.6/0.65-0.923 is more than 0.9; determining the mode which accounts for 90% of the vibration in the order of vibration as the mode corresponding to the first 3 mode participation factors, namely, the 1 st order mode, the 3 rd order mode and the 2 nd order mode as the mode corresponding to the order of vibration.
In the 2 nd order vibration, k is 1, and k is not less than 1 and not more than 5.
The sum of the first 1 modal participation factors is 0.4, and 0.444 is less than 0.9 in 0.4/0.9; then k is added by 1;
the sum of the first 2 modal participation factors is 0.4+ 0.2-0.6, and 0.6/0.9-0.667 < 0.9; then k is added with 1;
the sum of the first 3 modal participation factors is 0.4+0.2+ 0.15-0.75, and 0.75/0.9-0.833 < 0.9; then k is added with 1;
the sum of the first 4 modal participation factors is 0.4+0.2+0.15+ 0.1-0.85, and 0.85/0.9-0.944 > 0.9; determining the mode which accounts for 90% of the vibration in the order of vibration as the mode corresponding to the first 4 mode participation factors, namely, the 1 st order mode, the 3 rd order mode, the 5 th order mode and the 2 nd order mode as the mode corresponding to the order of vibration.
Step S5: for each set of preselected connection points: and respectively applying a mode corresponding to each order of vibration in m orders before the vibration frequency spectrum, then obtaining the vibration response generated by each order of vibration in the response area, and superposing the vibration responses generated by the vibration of the m orders before in the response area, thereby obtaining the combined vibration generated by each group of preselected connection points in the response area.
The method specifically comprises the following steps:
step S51: and gridding the response area, wherein nodes of the grid are used as detection points of the vibration response.
Step S52:
s521: and respectively applying the mode corresponding to each vibration in the previous m orders to the selected group of preselected connection points.
For example, 1 st order mode, 3 rd order mode and 2 nd order mode of 1 st order vibration are applied to the selected group of preselected connection points respectively; 1 st, 3 rd, 5 th and 2 nd order modes of the 2 nd order vibration.
S522: and respectively acquiring the vibration response of each order of vibration generated at the detection point at each detection point, and superposing the vibration response of each order of vibration of the previous m orders at the detection points, thereby obtaining the resultant vibration generated by the group of preselected connection points at each detection point.
For example, for one of the detection points,
firstly, respectively obtaining vibration responses R11, R13 and R12 generated by a 1 st order mode, a 3 rd order mode and a 2 nd order mode of 1 st order vibration at a 1 st order vibration frequency F1 at a detection point, wherein the steps can be detected by a vibration sensor; these three vibration responses are summed, R1 ═ R11+ R13+ R12, and a vibration response R1 generated at the detection point by the 1 st order vibration is obtained.
Then, respectively obtaining vibration responses R21, R23, R25 and R22 of a 1 st order mode, a 3 rd order mode, a 5 th order mode and a 2 nd order mode of 2 nd order vibration generated at the detection point at a 2 nd order vibration frequency F2, wherein the steps can be detected by a vibration sensor; these four vibration responses are summed, R2 ═ R21+ R23+ R25+ R22, and a vibration response R2 generated at the detection point by the 2 nd order vibration is obtained.
Finally, the vibration response R1 generated by the 1 st order vibration at the detection point and the vibration response R2 generated by the 2 nd order vibration at the detection point are superposed,
thereby obtaining the resultant vibration generated by the group of preselected connection points at the detection point
S523: and obtaining the resultant vibration generated by the group of preselected connection points at each detection point by adopting the same method, and superposing the resultant vibrations generated by the group of preselected connection points at each detection point (the superposition means that the square sum of the several resultant vibrations is solved first, and then the solved square sum is subjected to root opening), so as to obtain the resultant vibration generated by the group of preselected connection points in the response area.
Step S53: and repeating the step S52 through all the groups of preselected connection points of the selected excitation area, thereby obtaining the resultant vibration generated by each group of preselected connection points in the response area.
That is, each set of preselected connection points is selected in turn, and step S52 is performed on the selected set of preselected connection points, thereby obtaining a resultant vibration generated in the response region by each set of preselected connection points.
Step S6: and comparing the magnitude of the resultant vibration generated in the response region by each group of the preselected connection points to obtain the minimum value, wherein the group of the preselected connection points corresponding to the minimum value is the optimal group of connection points, and the compressor is connected with the optimal group of connection points.
The optimal group connecting point is the optimal connecting position of the compressor on the base plate, when the compressor is connected to the optimal group connecting point, the vibration of the base plate response area is minimum, the problem of vibration noise caused by the transmission of the compressor to the base plate is improved as much as possible, the vibration noise of the air conditioner shell caused by the vibration of the compressor is reduced, the development period is shortened, and the development cost is reduced.
According to the vibration reduction method of the air conditioner, the vibration frequency spectrum of the compressor is obtained; judging whether the sum of the vibration energy of the first m orders of the vibration frequency spectrum/the total vibration energy is larger than or equal to a first set ratio or not; if not, adding 1 to m; if so, determining the mode of each order of vibration, which accounts for the contribution of the second set ratio to the vibration, in the first m orders of the vibration frequency spectrum as the mode corresponding to each order of vibration; for each set of preselected connection points: respectively applying a mode corresponding to each order of vibration in m orders before a vibration frequency spectrum, then obtaining the vibration response generated by each order of vibration in a response area, and superposing the vibration responses generated by the vibration of the m orders before in the response area, thereby obtaining the resultant vibration generated by each group of preselected connection points in the response area; comparing the magnitude of the resultant vibration generated by each group of preselected connection points in the response area to obtain the minimum value, wherein the group of preselected connection points corresponding to the minimum value is the optimal group of connection points, and the compressor is connected with the optimal group of connection points; when the compressor is connected to the optimal set of connection points, vibration of the chassis response area is minimized, and thus vibration transmitted to the air conditioning case is also minimized, thereby reducing air conditioning case vibration noise caused by compressor vibration.
The method of the embodiment is mainly based on analysis methods such as frequency characteristic analysis, mode participation factor analysis and mode-based vibration response analysis of main vibration energy of the compressor, and the like, and is used for identifying the main vibration energy characteristics and the corresponding main structural modes and finding out the optimal connection position through superposition and comparative analysis of the vibration response analysis.
The method of the embodiment can determine the optimal connection position of the compressor on the chassis by the method at the early stage of air conditioner design, thereby improving the problem of vibration noise caused by the transmission of the compressor to the chassis as much as possible, shortening the development period and reducing the development cost.
Based on the design of the vibration reduction method of the air conditioner, the embodiment also provides a vibration reduction system of the air conditioner, wherein a compressor of the air conditioner is arranged on a chassis, the chassis comprises an excitation area and a response area, and the excitation area comprises a plurality of groups of preselected connection points; the system comprises an acquisition module, a judgment module, a mode determination module, a combined vibration determination module, a comparison module and the like.
And the acquisition module is used for acquiring the vibration frequency spectrum of the compressor.
The judging module is used for judging whether the sum of the vibration energy of the first m orders of the vibration frequency spectrum/the total vibration energy is larger than or equal to a first set ratio; if not, adding 1 to m.
And the mode determining module is used for determining the mode which accounts for the contribution of the vibration in the second set ratio in each order of vibration in the first m orders of the vibration frequency spectrum as the mode corresponding to each order of vibration.
A resultant vibration determination module for, for each set of preselected connection points: and respectively applying a mode corresponding to each order of vibration in m orders before the vibration frequency spectrum, then obtaining the vibration response generated by each order of vibration in the response area, and superposing the vibration responses generated by the vibration of the m orders before in the response area, thereby obtaining the combined vibration generated by each group of preselected connection points in the response area.
And the comparison module is used for comparing the magnitude of the combined vibration generated by the groups of preselected connection points in the response area to obtain the minimum value, the group of preselected connection points corresponding to the minimum value is the optimal group of connection points, and the compressor is connected with the optimal group of connection points.
The mode determining module specifically comprises a frequency determining unit, a calculating unit, a sequencing unit, a judging unit and a mode determining unit.
A frequency determination unit for calculating a set upper frequency limit for each vibration in the previous m orders: fdi ═ P × Fi; fi is the frequency of the ith order vibration of the vibration frequency spectrum, and Fdi is the set upper frequency limit of the ith order vibration; i is 1,2, … …, m; p is more than 1 and less than 2.
And the calculating unit is used for selecting the mode with the mode frequency less than or equal to the set frequency upper limit of the order vibration in each order of the first m orders of vibration, calculating the mode participation factor of the mode selected by each order of vibration, and calculating the sum of the mode participation factors of all the modes selected by each order of vibration.
And the sequencing unit is used for sequencing the modal participation factors of all the modes selected by each order of vibration from large to small.
The judging unit is used for judging whether the sum of the first k modal participation factors/the sum of the modal participation factors of all the modes selected by the order of vibration is larger than or equal to a second set ratio or not in each order of vibration; if not, k is added by 1.
And the mode determining unit is used for determining that the mode which accounts for the contribution of the second set ratio to the vibration in the order of vibration is the mode corresponding to the first k mode participation factors and is used as the mode corresponding to the order of vibration.
The combined vibration determining module specifically comprises a meshing unit, a combined vibration determining unit and a traversing unit.
And the gridding unit is used for gridding the response area, and the nodes of the grid are used as the detection points of the vibration response.
The combined vibration determining unit is used for respectively applying a mode corresponding to each order of vibration in the previous m orders to the selected group of preselected connection points; respectively acquiring the vibration response of each order of vibration generated at the detection points at each detection point, and superposing the vibration response of each order of vibration of the previous m orders at the detection points, thereby obtaining the resultant vibration generated by the group of preselected connection points at each detection point; and superposing the resultant vibration generated by the group of preselected connection points at each detection point to obtain the resultant vibration generated by the group of preselected connection points in the response area.
And the traversing unit is used for traversing all groups of preselected connection points of the selected excitation area.
The working process of the air conditioner vibration damping system has been described in detail in the above air conditioner vibration damping method, and is not described herein again.
The vibration reduction system of the air conditioner of the embodiment obtains the vibration frequency spectrum of the compressor; judging whether the sum of the vibration energy of the first m orders of the vibration frequency spectrum/the total vibration energy is larger than or equal to a first set ratio or not; if not, adding 1 to m; if so, determining the mode of each order of vibration, which accounts for the contribution of the second set ratio to the vibration, in the first m orders of the vibration frequency spectrum as the mode corresponding to each order of vibration; for each set of preselected connection points: respectively applying a mode corresponding to each order of vibration in m orders before a vibration frequency spectrum, then obtaining the vibration response generated by each order of vibration in a response area, and superposing the vibration responses generated by the vibration of the m orders before in the response area, thereby obtaining the resultant vibration generated by each group of preselected connection points in the response area; comparing the magnitude of the resultant vibration generated by each group of preselected connection points in the response area to obtain the minimum value, wherein the group of preselected connection points corresponding to the minimum value is the optimal group of connection points, and the compressor is connected with the optimal group of connection points; when the compressor is connected to the optimal set of connection points, vibration of the chassis response area is minimized, and thus vibration transmitted to the air conditioning case is also minimized, thereby reducing air conditioning case vibration noise caused by compressor vibration.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A vibration reduction method for an air conditioner is characterized in that a compressor of the air conditioner is arranged on a chassis, and the vibration reduction method comprises the following steps: the chassis comprises an excitation area and a response area, wherein the excitation area comprises a plurality of groups of preselected connection points; the method comprises the following steps:
(1) obtaining a vibration frequency spectrum of the compressor;
(2) judging whether the sum of the vibration energy of the first m orders of the vibration frequency spectrum/the total vibration energy is larger than or equal to a first set ratio or not;
if not, executing the step (3): adding 1 to m, and returning to the step (2);
if yes, executing the following steps:
(4) determining the mode of each order of vibration, which accounts for the contribution of the second set ratio to the vibration, in the first m orders of the vibration spectrum as the mode corresponding to each order of vibration;
(5) for each set of preselected connection points: respectively applying a mode corresponding to each order of vibration in m orders before a vibration frequency spectrum, then obtaining the vibration response generated by each order of vibration in a response area, and superposing the vibration responses generated by the vibration of the m orders before in the response area, thereby obtaining the resultant vibration generated by each group of preselected connection points in the response area;
(6) and comparing the magnitude of the resultant vibration generated in the response region by each group of the preselected connection points to obtain the minimum value, wherein the group of the preselected connection points corresponding to the minimum value is the optimal group of connection points, and the compressor is connected with the optimal group of connection points.
2. The vibration damping method according to claim 1, characterized in that: the step (4) specifically comprises the following steps:
(41) calculating the upper limit of the set frequency of each vibration in the previous m orders: fdi = P Fi;
fi is the frequency of the ith order vibration of the vibration frequency spectrum, and Fdi is the set upper frequency limit of the ith order vibration; i =1,2, … …, m; p is more than 1 and less than 2;
(42) selecting a mode with a modal frequency less than or equal to the set upper frequency limit of the first m-order vibration, calculating modal participation factors of the selected mode of each order vibration, and calculating the sum of the modal participation factors of all the modes selected by each order vibration;
(43) sorting the modal participation factors of all the modes selected by each order of vibration from large to small;
(44) judging whether the sum of the first k modal participation factors/the sum of the modal participation factors of all the modes selected by the order of vibration is larger than or equal to a second set ratio or not in each order of vibration;
if not, executing the step (45): k is added by 1 and returns to the step (44);
if so, determining that the mode which accounts for the contribution of the second set ratio to the vibration in the order of vibration is the mode corresponding to the first k mode participation factors, and taking the mode as the mode corresponding to the order of vibration.
3. The vibration damping method according to claim 1, characterized in that: the step (5) specifically comprises the following steps:
(51) gridding the response area, wherein nodes of the grid are used as detection points of the vibration response;
(52) respectively applying a mode corresponding to each order of vibration in the previous m orders to the selected group of preselected connection points;
respectively acquiring the vibration response of each order of vibration generated at the detection points at each detection point, and superposing the vibration response of each order of vibration of the previous m orders at the detection points, thereby obtaining the resultant vibration generated by the group of preselected connection points at each detection point;
superposing the resultant vibration generated by the group of preselected connection points at each detection point to obtain the resultant vibration generated by the group of preselected connection points in the response area;
(53) and (4) traversing all groups of preselected connection points of the selected excitation area, and repeatedly executing the step (52), thereby obtaining the resultant vibration generated by each group of preselected connection points in the response area.
4. The vibration damping method according to claim 1, characterized in that: the method further comprises the following steps:
gridding the excitation area;
the nodes of the grid are selected according to the bottom structure of the compressor, and a plurality of groups of preselected connection points are selected.
5. The vibration damping method according to claim 1, characterized in that: the first set ratio is 90%.
6. The vibration damping method according to claim 2, characterized in that: the second set ratio is 90%.
7. The vibration damping method according to claim 2, characterized in that: p = 1.2.
8. The utility model provides an air conditioner damping system, the compressor of air conditioner is installed on the chassis, its characterized in that: the chassis comprises an excitation area and a response area, wherein the excitation area comprises a plurality of groups of preselected connection points; the system comprises:
the acquisition module is used for acquiring a compressor vibration frequency spectrum;
the judging module is used for judging whether the sum of the vibration energy of the first m orders of the vibration frequency spectrum/the total vibration energy is larger than or equal to a first set ratio; if not, adding 1 to m;
the mode determining module is used for determining a mode which accounts for the contribution of the vibration in a second set ratio in the first m orders of the vibration frequency spectrum and is used as a mode corresponding to each order of vibration;
a resultant vibration determination module for, for each set of preselected connection points: respectively applying a mode corresponding to each order of vibration in m orders before a vibration frequency spectrum, then obtaining the vibration response generated by each order of vibration in a response area, and superposing the vibration responses generated by the vibration of the m orders before in the response area, thereby obtaining the resultant vibration generated by each group of preselected connection points in the response area;
and the comparison module is used for comparing the magnitude of the combined vibration generated by the groups of preselected connection points in the response area to obtain the minimum value, the group of preselected connection points corresponding to the minimum value is the optimal group of connection points, and the compressor is connected with the optimal group of connection points.
9. The vibration dampening system of claim 8, wherein: the modality determining module specifically includes:
a frequency determination unit for calculating a set upper frequency limit for each vibration in the previous m orders: fdi = P Fi; fi is the frequency of the ith order vibration of the vibration frequency spectrum, and Fdi is the set upper frequency limit of the ith order vibration; i =1,2, … …, m; p is more than 1 and less than 2;
the calculation unit is used for selecting the mode with the mode frequency less than or equal to the set frequency upper limit of the order vibration in each order of the first m orders of vibration, calculating the mode participation factor of the mode selected by each order of vibration, and calculating the sum of the mode participation factors of all the modes selected by each order of vibration;
the sorting unit is used for sorting the modal participation factors of all the modes selected by each order of vibration from large to small;
the judging unit is used for judging whether the sum of the first k modal participation factors/the sum of the modal participation factors of all the modes selected by the order of vibration is larger than or equal to a second set ratio or not in each order of vibration; if not, adding 1 to k;
and the mode determining unit is used for determining that the mode which accounts for the contribution of the second set ratio to the vibration in the order of vibration is the mode corresponding to the first k mode participation factors and is used as the mode corresponding to the order of vibration.
10. The vibration dampening system of claim 8, wherein: the resultant vibration determining module specifically comprises:
the gridding unit is used for gridding the response area, and nodes of the grids are used as detection points of the vibration response;
the combined vibration determining unit is used for respectively applying a mode corresponding to each order of vibration in the previous m orders to the selected group of preselected connection points; respectively acquiring the vibration response of each order of vibration generated at the detection points at each detection point, and superposing the vibration response of each order of vibration of the previous m orders at the detection points, thereby obtaining the resultant vibration generated by the group of preselected connection points at each detection point; superposing the resultant vibration generated by the group of preselected connection points at each detection point to obtain the resultant vibration generated by the group of preselected connection points in the response area;
and the traversing unit is used for traversing all groups of preselected connection points of the selected excitation area.
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| JP2000041397A (en) * | 1998-07-22 | 2000-02-08 | Matsushita Refrig Co Ltd | Vibration alleviating apparatus for air conditioner |
| CN101936956B (en) * | 2010-07-05 | 2011-12-28 | 天津大学 | Monitoring system and method of arch dam |
| CN103629297B (en) * | 2013-12-16 | 2015-08-12 | 洛阳双瑞橡塑科技有限公司 | Equipment mounting base wideband dynamic damping vibration damping equipment |
| CN203907970U (en) * | 2014-05-27 | 2014-10-29 | 美的集团武汉制冷设备有限公司 | Air conditioning outdoor unit base plate assembly and air conditioner |
| CN105205197B (en) * | 2014-06-30 | 2018-06-22 | 青岛海尔空调器有限总公司 | A kind of oscillation damping method of air-conditioner outdoor unit tonifying Qi pipeline |
| CN104132791B (en) * | 2014-07-17 | 2016-09-14 | 浙江工业大学 | A kind of operational modal analysis experimental technique based on pulse excitation |
| CN204176798U (en) * | 2014-09-15 | 2015-02-25 | 美的集团武汉制冷设备有限公司 | Air-conditioner outdoor unit |
| CN104390285A (en) * | 2014-11-18 | 2015-03-04 | 珠海格力电器股份有限公司 | Air condensing units chassis subassembly and air condensing units |
| CN105042828B (en) * | 2015-08-14 | 2018-06-29 | 珠海格力电器股份有限公司 | Vibration damping device and control method thereof |
| CN105509183A (en) * | 2016-02-26 | 2016-04-20 | 芜湖美智空调设备有限公司 | Outdoor unit and air conditioner comprising same |
| CN105783337B (en) * | 2016-04-11 | 2018-06-05 | 广东美的制冷设备有限公司 | Refrigerating plant |
| CN105889026B (en) * | 2016-04-11 | 2018-03-09 | 广东美的制冷设备有限公司 | Refrigerating plant and the shock-absorbing foot pad for compressor |
| CN106382206B (en) * | 2016-10-31 | 2018-10-16 | 美的集团股份有限公司 | Compressor, air-conditioner outdoor unit and air conditioner |
| CN106529048B (en) * | 2016-11-11 | 2019-04-09 | 四川长虹空调有限公司 | Compressor of air conditioner is piped Vibration Simulation method |
| CN107167306B (en) * | 2017-05-27 | 2020-11-06 | 南京航空航天大学 | Order extraction-based rotating machine rotor running state modal analysis method |
| CN107559201A (en) * | 2017-08-10 | 2018-01-09 | 珠海格力电器股份有限公司 | Machine foot structure of equipment, compressor and installation method of equipment |
| CN108416141A (en) * | 2017-08-31 | 2018-08-17 | 北京理工大学 | A kind of linear time-varying structural modal vibration shape discrimination method |
| CN108661882B (en) * | 2018-04-19 | 2021-11-16 | 珠海格力电器股份有限公司 | Compressor and air conditioner with same |
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Effective date of registration: 20210514 Address after: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao Applicant after: QINGDAO HAIER AIR-CONDITIONING ELECTRONIC Co.,Ltd. Applicant after: Haier Smart Home Co., Ltd. Address before: 266101 Haier Industrial Park, 1 Haier Road, Laoshan District, Shandong, Qingdao Applicant before: QINGDAO HAIER AIR-CONDITIONING ELECTRONIC Co.,Ltd. |
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