CN115406663A - Method and device for determining surface vibration index of engine part - Google Patents
Method and device for determining surface vibration index of engine part Download PDFInfo
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- CN115406663A CN115406663A CN202210888718.3A CN202210888718A CN115406663A CN 115406663 A CN115406663 A CN 115406663A CN 202210888718 A CN202210888718 A CN 202210888718A CN 115406663 A CN115406663 A CN 115406663A
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- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/12—Testing internal-combustion engines by monitoring vibrations
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Abstract
The invention discloses a method and a device for determining surface vibration indexes of engine parts, and relates to the technical field of engines. The invention determines the target value of the vibration speed level of the surface of the part of the engine according to the target value of the sound pressure level of the radiation noise of the whole engine, realizes the definition of the vibration index of the surface of the part of the engine, can test whether the structural design of the part meets the vibration index of the surface of the part after the design of the part is finished, and can perform redesign at the design stage of the part if the test result does not meet the standard, thereby being beneficial to reducing the development period and the cost of the engine.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method and a device for determining surface vibration indexes of engine parts.
Background
The initial development of the engine generally defines the sound pressure level target of the overall radiated noise of the engine. When all parts of the engine are designed in the design stage, no part surface vibration index exists, whether the structural design of the parts meets the noise requirement cannot be judged, only after the complete machine development of the engine is completed, the complete machine radiation noise is tested in the test verification stage, if the test result does not reach the standard, all parts can be redesigned, and the development period and the cost can be greatly increased.
It can be understood that if the surface vibration index of the part can be defined, it is possible to determine whether the structural design of the part meets the surface vibration index of the part after the design of the part is completed, and if the test result does not meet the standard, the part can be redesigned at the design stage, thereby reducing the development period and the cost. Therefore, how to define the surface vibration index of the engine component is an urgent problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides a method and a device for determining the surface vibration index of the engine part, and solves the technical problem of how to define the surface vibration index of the engine part.
On one hand, the embodiment of the invention provides the following technical scheme:
a method for determining the surface vibration index of an engine part comprises the following steps:
acquiring a sound pressure level target value of the radiation noise of the whole engine;
and determining a target value of the vibration speed level of the surface of the part of the engine according to the sound pressure level target value.
Preferably, the determining a target value of a vibration speed level of a surface of a component of an engine according to the target value of the sound pressure level includes:
determining a sound power level target value according to the sound pressure level target value;
determining a target value of the vibration speed level of the surface of the engine according to the target value of the sound power level;
determining a standard frequency vibration speed level target value according to the engine surface vibration speed level target value;
and determining the target value of the vibration speed level of the surface of the part according to the center frequency of the octave and the target value of the vibration speed level of the standard frequency.
Preferably, the determining the sound power level target value according to the sound pressure level target value includes:
acquiring atmospheric pressure and ambient temperature corresponding to the sound pressure level target value;
determining a temperature and air pressure correction coefficient according to the atmospheric pressure and the environmental temperature;
and determining the sound power level target value according to the sound pressure level target value and the temperature and air pressure correction coefficient.
Preferably, the determining the temperature and air pressure correction coefficient according to the atmospheric pressure and the environmental temperature includes:
C 1 is the temperature and air pressure correction factor, B is the atmospheric pressure, B 0 T is the ambient temperature, referred to as the standard atmospheric pressure.
Preferably, the determining the sound power level target value according to the sound pressure level target value and the temperature and air pressure correction coefficient includes:
L W ＝L P +10·log 10 4πr 2 +C 1 ；
L W for said sound power level target value, L P Is the sound pressure level target value, r is the test radius corresponding to the sound pressure level target value, C 1 And the temperature and air pressure correction coefficients are obtained.
Preferably, said determining an engine surface vibration speed level target value according to said sound power level target value comprises:
Preferably, the determining a target value of a vibration speed level of a standard frequency according to the target value of the vibration speed level of the surface of the engine includes:
v j for the standard frequency vibration speed level target value,
is said engine surface vibration speed level target value, C 2 Is an octave correction factor.
On the other hand, the embodiment of the invention also provides the following technical scheme:
an engine component surface vibration index determining apparatus comprising:
the sound pressure level target value acquisition module is used for acquiring a sound pressure level target value of the whole engine radiation noise;
and the part surface vibration index determining module is used for determining the part surface vibration speed level target value of the engine according to the sound pressure level target value.
Preferably, the component surface vibration index determining module is further configured to:
determining a sound power level target value according to the sound pressure level target value;
determining an engine surface vibration speed level target value according to the sound power level target value;
determining a standard frequency vibration speed level target value according to the engine surface vibration speed level target value;
and determining the target value of the vibration speed level of the surface of the part according to the center frequency of the octave and the target value of the vibration speed level of the standard frequency.
Preferably, the component surface vibration index determining module is further configured to:
acquiring atmospheric pressure and ambient temperature corresponding to the sound pressure level target value;
determining a temperature and air pressure correction coefficient according to the atmospheric pressure and the environmental temperature;
and determining the sound power level target value according to the sound pressure level target value and the temperature and air pressure correction coefficient.
Preferably, the component surface vibration index determining module determines the temperature and air pressure correction coefficient according to the atmospheric pressure and the ambient temperature, and includes:
C 1 is the temperature and air pressure correction factor, B is the atmospheric pressure, B 0 For reference to standard atmospheric pressure, T is the ambient temperature.
Preferably, the determining module of the component surface vibration index determines the sound power level target value according to the sound pressure level target value and the temperature and air pressure correction coefficient, and includes:
L W ＝L P +10·log 10 4πr 2 +C 1 ；
L W is the sound power level target value, L P Is the sound pressure level target value, r is the test radius corresponding to the sound pressure level target value, C 1 And the temperature and air pressure correction coefficients are obtained.
Preferably, the component surface vibration index determination module determines an engine surface vibration speed level target value according to the sound power level target value, and includes:
Preferably, the component surface vibration index determination module determines a standard frequency vibration speed level target value according to the engine surface vibration speed level target value, and includes:
v j for the standard frequency vibration speed level target value,
is said engine surface vibration speed level target value, C 2 Is an octave correction factor.
On the other hand, the embodiment of the invention also provides the following technical scheme:
an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements any one of the above engine component surface vibration index determination methods.
On the other hand, the embodiment of the invention also provides the following technical scheme:
a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements any of the above engine component surface vibration index determination methods.
The technical scheme provided by the invention at least has the following technical effects or advantages:
the invention determines the target value of the vibration speed level of the surface of the part of the engine according to the target value of the sound pressure level of the radiation noise of the whole engine, realizes the definition of the vibration index of the surface of the part of the engine, can test whether the structural design of the part meets the vibration index of the surface of the part after the design of the part is finished, and can redesign the part at the design stage if the test result does not meet the standard, thereby being beneficial to reducing the development period and the cost of the engine.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for determining a surface vibration index of an engine component according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of an engine component surface vibration index determination device in an embodiment of the invention.
Detailed Description
The embodiment of the invention provides a method and a device for determining the surface vibration index of the engine part, and solves the technical problem of how to define the surface vibration index of the engine part.
In order to better understand the technical scheme of the invention, the technical scheme of the invention is described in detail in the following with the accompanying drawings and specific embodiments.
As shown in fig. 1, the method for determining the surface vibration index of the engine component according to the embodiment includes:
s1, acquiring a sound pressure level target value of the radiation noise of the whole engine;
and S2, determining a target value of the vibration speed level of the surface of the part of the engine according to the target value of the sound pressure level.
In step S1, the sound pressure level is obtained by multiplying the ratio of the sound pressure to the reference sound pressure by 20 after taking the common logarithm, and the unit is dB. In step S2, the target value of the surface vibration speed level of the component is a surface vibration index of the engine component.
The method for determining the surface vibration index of the engine part determines the surface vibration speed level target value of the part of the engine according to the sound pressure level target value of the radiation noise of the whole engine, realizes the definition of the surface vibration index of the part of the engine, can test whether the structural design of the part meets the surface vibration index of the part after the design of the part is completed, and can perform redesign in the design stage of the part if the test result does not meet the standard, thereby being beneficial to reducing the development period and the cost of the engine.
In this embodiment, step S2 specifically includes:
determining a sound power level target value according to the sound pressure level target value;
determining a target value of the vibration speed level of the surface of the engine according to the target value of the sound power level;
determining a standard frequency vibration speed level target value according to the engine surface vibration speed level target value;
and determining the target value of the vibration speed level of the surface of the part according to the center frequency of the octave and the target value of the vibration speed level of the standard frequency.
The sound power level is obtained by multiplying the ratio of the sound power to the reference sound power by 10 after taking the common logarithm, and the unit of the sound power level is dB.
In this embodiment, under the requirement of the whole engine radiation noise, sound pressure level target values defined under different test radii, atmospheric pressures and ambient temperatures are different, and how large the ambient temperature and the atmospheric pressure correspond to the sound pressure level target value is specified when the sound pressure level target value is determined. If the sound pressure level target value corresponds to the reference standard ambient temperature and the reference standard atmospheric pressure, the influence of the ambient temperature and the atmospheric pressure on the determination of the sound power level target value does not need to be considered, and the sound power level target value can be directly determined according to the sound pressure level target value, wherein the formula is as follows: l is a radical of an alcohol W ＝L P +10·log 10 4πr 2 ，L W Is the sound power level target value, L P And r is the test radius corresponding to the sound pressure level target value. The sound power level target value thus obtained is accurate. However, if the sound pressure level target value does not correspond to the reference standard ambient temperature and the reference standard atmospheric pressure, the influence of the ambient temperature and the atmospheric pressure corresponding to the sound pressure level target value on the determination of the sound power level target value needs to be considered, otherwise, the obtained sound power level target value is inaccurate. For this reason, in step S2 of this embodiment, determining the sound power level target value according to the sound pressure level target value specifically includes:
acquiring atmospheric pressure and ambient temperature corresponding to the sound pressure level target value;
determining a temperature and air pressure correction coefficient according to the atmospheric pressure and the ambient temperature corresponding to the sound pressure level target value;
and determining the sound power level target value according to the sound pressure level target value, the temperature and the air pressure correction coefficient.
Wherein, according to the atmospheric pressure and the ambient temperature that the sound pressure level target value corresponds and confirm temperature and atmospheric pressure correction coefficient, include:
C 1 temperature and air pressure correction coefficients; b is the atmospheric pressure corresponding to the sound pressure level target value, and the unit is Pa; b is 0 A value of 101325Pa for reference to standard atmospheric pressure; and T is the ambient temperature corresponding to the sound pressure level target value and has the unit of ℃.
Wherein, according to sound pressure level target value and temperature and atmospheric pressure correction coefficient confirm the sound power level target value, include:
L W ＝L P +10·log 10 4πr 2 +C 1 ；
L W is the sound power level target value with the unit of dB; l is a radical of an alcohol P Is the sound pressure level target value with the unit of dB; and r is the test radius corresponding to the sound pressure level target value, namely the distance from the defined microphone position to the test center, and the unit is m.
In step S2, determining a target value of the vibration speed level of the engine surface according to the target value of the sound power level includes:
In step S2, determining a target value of a vibration speed level of a standard frequency according to the target value of the vibration speed level of the surface of the engine, including:
v j the target value of the vibration speed level of the standard frequency is dB; c 2 C corresponding to 1/3 octave for octave correction factor 2 Is 6dB, C corresponding to octave 2 Is 11dB.
In step S2, an example of determining the target value of the vibration speed level of the surface of the component according to the center frequency of the octave and the target value of the vibration speed level of the standard frequency is shown in table 1.
TABLE 1
The standard frequency in table 1 is 1000, and it can be seen that when the center frequency of the octave is 1000 or more, the target values of the vibration speed levels of the surface of the component are the target values of the vibration speed levels of the standard frequency.
As shown in fig. 2, the present embodiment further provides an engine component surface vibration index determining apparatus, including:
the sound pressure level target value acquisition module is used for acquiring a sound pressure level target value of the whole engine radiation noise;
and the part surface vibration index determining module is used for determining the part surface vibration speed level target value of the engine according to the sound pressure level target value.
The device for determining the surface vibration index of the engine part determines the surface vibration speed level target value of the part of the engine according to the sound pressure level target value of the radiation noise of the whole engine, realizes the definition of the surface vibration index of the engine part, can test whether the structural design of the part meets the surface vibration index of the part after the design of the part is finished, and can be redesigned in the design stage of the part if the test result does not meet the standard, thereby being beneficial to reducing the development period and the cost of the engine.
Further, the component surface vibration index determining module is further configured to:
determining a sound power level target value according to the sound pressure level target value;
determining a target value of the vibration speed level of the surface of the engine according to the target value of the sound power level;
determining a standard frequency vibration speed level target value according to the engine surface vibration speed level target value;
and determining the target value of the vibration speed level of the surface of the part according to the center frequency of the octave and the target value of the vibration speed level of the standard frequency.
Further, the component surface vibration index determining module is further configured to:
acquiring atmospheric pressure and ambient temperature corresponding to the sound pressure level target value;
determining a temperature and air pressure correction coefficient according to the atmospheric pressure and the ambient temperature corresponding to the sound pressure level target value;
and determining the sound power level target value according to the sound pressure level target value, the temperature and the air pressure correction coefficient.
Further, the component surface vibration index determining module determines the temperature and air pressure correction coefficient according to the atmospheric pressure and the ambient temperature corresponding to the sound pressure level target value, and includes:
C 1 the correction coefficient of temperature and air pressure, B is the atmospheric pressure corresponding to the sound pressure level target value, B 0 For reference to standard atmospheric pressure, T is sound pressureThe stage target value corresponds to the ambient temperature.
Further, the module for determining the surface vibration index of the component determines the target value of the sound power level according to the target value of the sound pressure level, the temperature and the air pressure correction coefficient, and comprises:
L W ＝L P +10·log 10 4πr 2 +C 1 ；
L W is a sound power level target value, L P And r is the test radius corresponding to the sound pressure level target value.
Further, the component surface vibration index determination module determines an engine surface vibration speed level target value according to the acoustic power level target value, and includes:
Further, the component surface vibration index determination module determines a standard frequency vibration speed level target value according to the engine surface vibration speed level target value, and includes:
v j as a target value of a vibration speed level of a standard frequency, C 2 Is an octave correction factor.
Based on the same inventive concept as the method for determining the surface vibration index of the engine component, the present embodiment further provides an electronic device, which includes a memory, a processor and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of any one of the methods for determining the surface vibration index of the engine component when executing the computer program.
Where a bus architecture (represented by a bus) is used, the bus may comprise any number of interconnected buses and bridges that link together various circuits including one or more processors, represented by a processor, and memory, represented by a memory. The bus may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface provides an interface between the bus and the receiver and transmitter. The receiver and transmitter may be the same element, i.e., a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor is responsible for managing the bus and general processing, while the memory may be used for storing data used by the processor in performing operations.
Since the electronic device described in this embodiment is an electronic device used for implementing the method for determining the surface vibration index of the engine component in the embodiment of the present invention, based on the method for determining the surface vibration index of the engine component described in this embodiment of the present invention, a person skilled in the art can understand the specific implementation manner of the electronic device of this embodiment and various variations thereof, and therefore, how to implement the method in the embodiment of the present invention by the electronic device is not described in detail herein. The electronic device used by the person skilled in the art to implement the method for determining the surface vibration index of the engine component in the embodiment of the present invention is within the scope of the present invention.
Based on the same inventive concept as the engine part surface vibration index determining method described above, the present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements any of the engine part surface vibration index determining methods described above.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for determining surface vibration indexes of engine parts is characterized by comprising the following steps:
acquiring a sound pressure level target value of the radiation noise of the whole engine;
and determining a target value of the vibration speed level of the surface of the part of the engine according to the sound pressure level target value.
2. The engine component surface vibration index determination method according to claim 1, wherein determining a component surface vibration speed level target value of the engine based on the sound pressure level target value includes:
determining a sound power level target value according to the sound pressure level target value;
determining an engine surface vibration speed level target value according to the sound power level target value;
determining a standard frequency vibration speed level target value according to the engine surface vibration speed level target value;
and determining the target value of the vibration speed level of the surface of the part according to the center frequency of the octave and the target value of the vibration speed level of the standard frequency.
3. The engine component surface vibration index determination method of claim 2, wherein said determining a sound power level target value based on said sound pressure level target value comprises:
acquiring atmospheric pressure and ambient temperature corresponding to the sound pressure level target value;
determining a temperature and air pressure correction coefficient according to the atmospheric pressure and the environmental temperature;
and determining the sound power level target value according to the sound pressure level target value and the temperature and air pressure correction coefficient.
4. The engine component surface vibration index determination method of claim 3, wherein said determining a temperature and barometric pressure correction factor based on said barometric pressure and said ambient temperature comprises:
C 1 is the temperature and barometric pressure correction factor, B is the atmospheric pressure, B 0 T is the ambient temperature, referred to as the standard atmospheric pressure.
5. The engine component surface vibration index determination method of claim 3, wherein said determining said sound power level target value based on said sound pressure level target value and said temperature and air pressure correction factor comprises:
L W ＝L P +10·log 10 4πr 2 +C 1 ；
L W for said sound power level target value, L P Is the sound pressure level target value, r is the test radius corresponding to the sound pressure level target value, C 1 And correcting coefficients for the temperature and the air pressure.
6. The engine component surface vibration index determination method of claim 2, wherein said determining an engine surface vibration speed level target value based on said acoustic power level target value comprises:
7. The engine component surface vibration index determination method according to claim 2, wherein said determining a standard frequency vibration speed level target value based on said engine surface vibration speed level target value includes:
v j for the standard frequency vibration speed level target value,
is said engine surface vibration speed level target value, C 2 Is an octave correction factor.
8. An engine component surface vibration index determining apparatus, comprising:
the sound pressure level target value acquisition module is used for acquiring a sound pressure level target value of the whole engine radiation noise;
and the part surface vibration index determining module is used for determining a part surface vibration speed level target value of the engine according to the sound pressure level target value.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and operable on the processor, wherein the processor executes the program to implement the engine component surface vibration index determination method according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the engine part surface vibration index determination method of any one of claims 1 to 7.
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| CN202210888718.3A CN115406663A (en) | 2022-07-27 | 2022-07-27 | Method and device for determining surface vibration index of engine part |
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