CN109063312B - Vibration simulation method for piping system of double-rotor compressor of variable frequency air conditioner - Google Patents
Vibration simulation method for piping system of double-rotor compressor of variable frequency air conditioner Download PDFInfo
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- CN109063312B CN109063312B CN201810834165.7A CN201810834165A CN109063312B CN 109063312 B CN109063312 B CN 109063312B CN 201810834165 A CN201810834165 A CN 201810834165A CN 109063312 B CN109063312 B CN 109063312B
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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/06—Multi-objective optimisation, e.g. Pareto optimisation using simulated annealing [SA], ant colony algorithms or genetic algorithms [GA]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention relates to the field of air conditioners, discloses a vibration simulation method for a piping system of a double-rotor compressor of a variable frequency air conditioner, and solves the problem that the error between a vibration simulation result and an actual measurement result of the piping system of the double-rotor compressor is large. The method comprises the following steps: carrying out vibration test on a piping system of the air conditioner double-rotor compressor to obtain test data; carrying out spectrum analysis on the test data to obtain frequency components of vibration response of the piping system of the compressor in a stable operation state of each frequency point; determining a finite element model of a piping system of a double-rotor compressor of an air conditioner; adding boundary conditions and load excitation to the finite element model in a virtual simulation environment; determining a simulation analysis frequency range according to a spectrum analysis result; simulation calculation is carried out to obtain simulation vibration response data of the piping; and performing curve fitting on the simulation data according to the test data spectrum analysis result. The method is suitable for simulating the piping system of the double-rotor compressor of the air conditioner.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to a vibration simulation method for a piping system of a double-rotor compressor of a variable frequency air conditioner.
Background
In an air conditioning system, a compressor is a heart, and the performance of the compressor directly influences the performance of the air conditioner. And because the double-rotor compressor is provided with two rotors which are symmetrically distributed at 180 degrees on the internal crankshaft, the rotating inertia force of the rotors can be balanced, so that the double-rotor compressor runs more stably, and the vibration and noise characteristics are better. The characteristic of the double rotors can improve the lowest working rotating speed of the double rotors so as to improve the comfort of the air conditioner, and can also improve the highest working rotating speed of the double rotors so as to improve the quick refrigerating and heating capacity of the air conditioner. It is because of these advantages of the twin-rotor compressor that the twin-rotor compressor has been widely used in the home air conditioning system.
At present, the simulation methods of the piping system of the double-rotor compressor of the air conditioner mainly comprise two methods: (1) and (5) carrying out modal analysis. The simulation method can only obtain the natural frequency and the corresponding vibration mode of the piping system of the double-rotor compressor, and the quality of the piping design scheme is not quantified. (2) And (5) harmonic response analysis. The simulation method is mainly used in multi-scheme optimization, and a better pipeline design scheme can be selected by applying the same load in simulation and comparing the obtained simulation results. However, the load excitation characteristic of the dual-rotor compressor and the frequency component of piping vibration response are not considered in the simulation method, so that the simulation result has a large error with an actual test result, the vibration condition of a piping system of the dual-rotor compressor cannot be accurately predicted, and an accurate direction cannot be provided for the optimization of a pipeline of the dual-rotor compressor.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the vibration simulation method for the piping system of the double-rotor compressor of the variable frequency air conditioner solves the problem that the error between the vibration simulation result and the actual measurement result of the piping system of the double-rotor compressor is large.
The technical scheme adopted by the invention for solving the technical problems is as follows: the vibration simulation method for the piping system of the double-rotor compressor of the variable frequency air conditioner comprises the following steps:
a. carrying out vibration test on a piping system of the air conditioner double-rotor compressor to obtain test data;
b. carrying out spectrum analysis on the test data to obtain frequency components of vibration response of the piping system of the compressor in a stable operation state of each frequency point;
c. determining a finite element model of a piping system of a double-rotor compressor of an air conditioner;
d. c, adding boundary conditions and load excitation to the finite element model determined in the step c under a virtual simulation environment;
e. b, determining a simulation analysis frequency range according to the spectrum analysis result determined in the step b;
f. d, determining a simulation analysis frequency range according to the boundary condition and the load excitation added in the step d and the step e, and performing simulation calculation to obtain simulation vibration response data of the piping;
g. and f, performing curve fitting on the simulation data obtained in the step f according to the test data spectrum analysis result obtained in the step b.
As a further optimization, the test data comprises stress and/or strain and/or acceleration and/or velocity and/or displacement data, while the vibration test data may be a time domain signal.
As a further optimization, in step b, the spectral analysis may be to convert the time domain signal into a frequency domain signal through Fast Fourier Transform (FFT), and then determine the frequency components of the piping system vibration response at each operating frequency point of the compressor.
As a further optimization, in step c, the mesh nodes at the joints of the sections of piping in the finite element model are shared, so that contact pairs are reduced during finite element simulation analysis, and the calculation speed is increased.
And d, as a further optimization, in the step d, the boundary condition is the fixed constraint of the rubber sole surface and the boundary pipe orifice, and the load excitation is a four-node displacement load. In the displacement load of the four nodes, the excitation amplitude of each node displacement load is the same, but the initial phase of each node displacement load excitation is different by 90 degrees. Because the rotating shaft on the double-rotor compressor is provided with two eccentric rotors which are symmetrically distributed at 180 degrees, if the compressor is divided into four quadrants, the rotating shaft rotates for a circle, the circumferential surface of the compressor is excited, and the displacement of the unit node of the four nodes is the excitation force which is used for simulating the two eccentric rotors to act on the surface of the cylinder body of the compressor.
As a further optimization, in the simulation analysis frequency range, the starting frequency is the normal operating frequency of the dual-rotor compressor, and the cut-off frequency is n times the maximum operating frequency of the dual-rotor compressor (n is greater than or equal to 2).
As a further optimization, in step f, the simulated vibration response data is a frequency domain signal, and the simulated vibration response data and the actually measured vibration response data should be in accordance with the type, wherein the data type may be stress data,
alternatively, the data type may be strain data;
alternatively, the data type may be acceleration data;
alternatively, the data type may be speed data;
alternatively, the data type may be displacement data.
As a further optimization, in step g, the curve fitting is performed by determining frequency components of piping vibration response at each operating frequency point of the compressor according to a frequency spectrum analysis result of the vibration test, and then linearly superimposing the simulation frequency domain data.
The invention has the beneficial effects that: the vibration simulation method takes the load excitation characteristic of the double-rotor compressor and the frequency component of the piping vibration response into consideration during vibration simulation, so that the vibration condition of the piping system of the double-rotor compressor of the air conditioner can be accurately predicted, and a basis is provided for piping design optimization and scheme selection. The simulation analysis result is utilized to optimize the piping in the piping concept design stage so as to achieve the purpose of reducing the vibration and noise of the piping system, thereby improving the success rate of the piping trial production, shortening the research and development design period and reducing the design and experiment cost.
Drawings
FIG. 1 is a flow chart of a vibration simulation method for a piping system of a dual-rotor compressor of a variable frequency air conditioner in an embodiment of the invention;
FIG. 2 is a graph of a spectral analysis of experimental test data;
FIG. 3 is a graph of experimental test stress frequency;
fig. 4 is a simulated stress frequency plot.
Detailed Description
The invention aims to provide a vibration simulation method for a piping system of a double-rotor compressor of a variable frequency air conditioner, which solves the problem that the error between a vibration simulation result and an actual measurement result of the piping system of the double-rotor compressor is large, can accurately predict the vibration condition of a piping design scheme and provides a basis for piping design optimization and scheme selection. The method comprises the following specific steps:
a. and carrying out vibration test on the piping system of the double-rotor compressor of the air conditioner to obtain test data. Wherein the test data comprises stress and/or strain and/or acceleration and/or velocity and/or displacement data, while the vibration test data may be a time domain signal.
b. And carrying out spectrum analysis on the test data to obtain the frequency components of the piping system vibration response of the compressor in the stable operation state of each frequency point. The frequency spectrum analysis may be to convert the time domain signal into a frequency domain signal through FFT, and further determine the frequency component of the piping system vibration response at each operating frequency point of the compressor.
c. And determining a finite element model of a piping system of the double-rotor compressor of the air conditioner. The finite element model can comprise a compressor, a pipe and a rubber foot, and the grid nodes at the joint of each section of pipe in the finite element model are shared.
d. And c, adding boundary conditions and load excitation to the finite element model determined in the step c in a virtual simulation environment. The boundary condition can be the fixed constraint of the rubber sole surface and the boundary pipe orifice, and the load excitation can be four-node displacement load; in the displacement load of the four nodes, the excitation amplitude of each node displacement load is the same, but the initial phase of each node displacement load excitation is different by 90 degrees. Because the rotating shaft on the double-rotor compressor is provided with two eccentric rotors which are symmetrically distributed at 180 degrees, if the compressor is divided into four quadrants, the rotating shaft rotates for a circle, the circumferential surface of the compressor is excited, and the displacement of the unit node of the four nodes is the excitation force which is used for simulating the two eccentric rotors to act on the surface of the cylinder body of the compressor.
e. And c, determining a simulation analysis frequency range according to the spectrum analysis result determined in the step b. In the simulation analysis frequency range, the starting frequency is the normal operating frequency of the dual-rotor compressor, the cut-off frequency is n times of the highest operating frequency of the dual-rotor compressor, and n is more than or equal to 2.
f. And d, determining a simulation analysis frequency range according to the boundary condition and the load excitation added in the step d and the step e, and performing simulation calculation to obtain simulation vibration response data of the piping. The simulated vibration response data is a frequency domain signal, the simulated vibration response data and the vibration response data obtained by actual measurement are consistent in type, and the data type can be stress data, strain data, acceleration data, speed data or displacement data.
g. And f, performing curve fitting on the simulation data obtained in the step f according to the test data spectrum analysis result obtained in the step b. The curve fitting can determine the frequency components of piping vibration response under each operating frequency point of the compressor according to the frequency spectrum analysis result of the vibration test, and then the simulation frequency domain data are linearly superposed.
Examples
The embodiment provides a vibration simulation method for a double-rotor compressor piping system of a variable frequency air conditioner, and specific implementation steps are explained below according to the attached drawings.
a. And performing vibration test on the piping system of the double-rotor compressor of the air conditioner to obtain test data, wherein the type of the test data in the embodiment is stress time domain data.
b. Performing spectrum analysis on the stress time domain data, converting the time domain signal into a frequency domain signal through FFT (fast Fourier transform), obtaining the frequency component of the piping system vibration response of the compressor in a stable operation state of each frequency point, as shown in FIG. 2, and converting the stress time domain data into stress frequency domain data, as shown in FIG. 3;
c. determining a finite element model of a piping system of a double-rotor compressor of an air conditioner, wherein the finite element model comprises a compressor, piping and rubber feet, and a grid node at the joint of each section of piping in the finite element model adopts a sharing mode;
d. adding boundary conditions and load excitation to the finite element model determined in the step c under a virtual simulation environment, wherein the boundary conditions are the fixed constraint of the bottom surface of the rubber foot and the boundary pipe orifice, the load excitation is four-node displacement load, the excitation amplitude of each node displacement load is 0.1mm, but the initial phase difference of each node displacement load excitation is 90 degrees, and the load excitation position is on the surface of the compressor cylinder body;
e. and b, determining a simulation analysis frequency range according to the spectrum analysis result determined by the b. The frequency component of the vibration response of the piping system in the example mainly consists of 1 frequency multiplication and 2 frequency multiplication of the running frequency of the compressor, and the running frequency range of the dual-rotor compressor is set to be 30 Hz-73.2 Hz in the test of the example, so the simulation analysis frequency range is set to be 30 Hz-160 Hz;
f. d, determining a simulation analysis frequency range according to the boundary condition and the load excitation added in the step d and the step e, and performing simulation calculation to obtain simulation stress response data of the piping, wherein the simulation stress response data is a frequency domain signal;
g. and f, performing curve fitting on the simulation data obtained in the step f according to the spectrum analysis result of the test data obtained in the step b. The simulation data obtained in this example is a stress frequency curve, and the 1-fold and 2-fold simulated stress frequency curves corresponding to the compressor operating frequency are linearly superimposed, as shown in fig. 4. And then comparing the peak frequency point of the fitted simulated stress frequency curve with the peak frequency point of the experimental test stress frequency curve, wherein the comparison result is shown in the table 1. The simulation curve peak frequency point is basically consistent with the test curve peak frequency point, and the accuracy of the simulation method is verified.
TABLE 1 comparison of simulated stress frequency curve with peak frequency point of experimental test stress frequency curve
| Simulation stress frequency curve peak frequency point | 37.4Hz | 42.2Hz | 73.4Hz |
| Testing stress frequency curve peak frequency point | 36.2Hz | 41Hz | 71.3Hz |
Claims (7)
1. The vibration simulation method for the piping system of the double-rotor compressor of the variable frequency air conditioner is characterized by comprising the following steps of:
a. carrying out vibration test on a piping system of the air conditioner double-rotor compressor to obtain test data;
b. carrying out spectrum analysis on the test data to obtain frequency components of vibration response of the piping system of the compressor in a stable operation state of each frequency point;
c. determining a finite element model of a piping system of a double-rotor compressor of an air conditioner;
d. c, adding boundary conditions and load excitation to the finite element model determined in the step c under a virtual simulation environment; the boundary condition is the fixed constraint of the rubber sole surface and the boundary pipe orifice, and the load excitation is four-node displacement load; the excitation amplitude of each node displacement load is the same, and the initial phase difference of each node displacement load excitation is 90 degrees;
e. b, determining a simulation analysis frequency range according to the spectrum analysis result determined in the step b;
f. d, determining a simulation analysis frequency range according to the boundary condition and the load excitation added in the step d and the step e, and performing simulation calculation to obtain simulation vibration response data of the piping;
g. according to the test data spectrum analysis result obtained in the step b, performing curve fitting on the simulation data obtained in the step f; and the curve fitting is to determine the frequency components of the piping vibration response under each operating frequency point of the compressor according to the frequency spectrum analysis result of the vibration test, and then linearly superimpose the simulation frequency domain data.
2. The vibration simulation method for piping systems of double rotors and compressors of inverter air conditioner according to claim 1, wherein in step a, the test data comprises stress and/or strain and/or acceleration and/or velocity and/or displacement data.
3. The vibration simulation method for piping system of dual rotors compressor of inverter air conditioner as claimed in claim 1, wherein in step a, said test data is time domain signal.
4. The vibration simulation method for piping systems of twin-rotor compressors of inverter air conditioners as claimed in claim 3, wherein in the step b, the frequency spectrum analysis is to convert the time domain signals into frequency domain signals by FFT, and further to determine the frequency components of the piping system vibration response at each operating frequency point of the compressors.
5. The vibration simulation method for piping systems of a double-rotor compressor of an inverter air conditioner as claimed in claim 1, wherein in the step c, the finite element model comprises a compressor, piping and rubber feet, and the mesh nodes at the joints of the sections of piping in the finite element model are shared.
6. The vibration simulation method for piping system of dual-rotor compressor of inverter air conditioner according to claim 1, wherein in step e, the simulation analysis frequency range has an initial frequency of normal operation frequency of dual-rotor compressor, a cut-off frequency of n times of the highest operation frequency of dual-rotor compressor, and n is greater than or equal to 2.
7. The vibration simulation method for piping system of dual rotors compressor of inverter air conditioner as claimed in claim 1, wherein in step f, said simulated vibration response data is frequency domain signal, and the simulated vibration response data should be in accordance with the type of the vibration response data obtained by actual measurement.
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| CN111651846B (en) * | 2020-06-02 | 2023-02-03 | 四川长虹空调有限公司 | Automatic optimization method for pipeline design of refrigeration equipment |
| CN111639455B (en) * | 2020-06-11 | 2022-09-30 | 四川长虹空调有限公司 | Vibration simulation method for piping of variable-frequency air conditioner compressor |
| CN111881605B (en) * | 2020-07-24 | 2022-12-16 | 四川长虹空调有限公司 | Automatic optimization design method for variable frequency air conditioner compressor pipeline |
| CN113139317B (en) * | 2021-05-12 | 2022-10-28 | 四川长虹空调有限公司 | Vibration simulation method for piping of air-conditioning compressor |
| CN113128101B (en) * | 2021-05-12 | 2022-07-12 | 四川长虹空调有限公司 | Method for evaluating vibration and low-frequency noise of variable-frequency air conditioner pipeline |
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