CN112906163A - Model selection method and model selection device of shock absorber - Google Patents
Model selection method and model selection device of shock absorber Download PDFInfo
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Abstract
The invention provides a model selection method and a model selection device of a shock absorber. The shock absorber is used for reducing vibration isolation for power electronic equipment, and the model selection method comprises the following steps: determining basic state information of the target shock absorber according to the state information of the power electronic equipment, wherein the basic state information comprises the working environment, the installation size and the bearing capacity of the target shock absorber; determining an excitation frequency of a target damper according to a power supply frequency of the power electronic equipment; determining a target vibration transmissibility of the target damper; determining a target stiffness of the target damper according to the excitation frequency, the target vibration transmissibility and the mass of the power electronic device; and selecting the shock absorber meeting the basic state information and the target rigidity from a preset shock absorber library as an actual shock absorber.
Description
Technical Field
The invention relates to a model selection design method of a shock absorber, in particular to a model selection and basic design method of a shock absorber of power electronic equipment suspended under a rail transit subway vehicle.
Background
The power electronic equipment refers to equipment taking power electronic devices as main functional elements, and comprises equipment such as a current transformer, a resistor, a reactor, an electronic switch and an electronic alternating current power controller. These power electronic devices constitute an important part of rail transit equipment, and performance optimization thereof is also an important concern.
Taking an auxiliary transformer in power electronic equipment as an example, the auxiliary transformer is generally a transformer in a rail transit auxiliary converter, is an important unit of a rail transit power system vehicle such as a subway vehicle and the like, is responsible for providing stable power frequency alternating current for a whole vehicle, and serves a lighting system, an air conditioning system, an air compression system, a conventional power supply system and the like of the whole vehicle. The auxiliary converter is fixed at the bottom of a carriage through bolts by rigid lifting lugs on the periphery, the auxiliary transformer is arranged at the center of the auxiliary converter and is hung on a frame beam of a converter cabinet body through 4 rigid lifting lugs, the weight of the auxiliary transformer is generally 350-550 kg, the power of the auxiliary transformer is 200-250 kVA, the auxiliary transformer is a vibration source, and the influence of the transformer on the vibration safety and the comfort of the converter cabinet body and a car body is particularly important to evaluate.
The auxiliary transformer can produce electromagnetic vibration, receive the influence of multiple electromagnetic force and input current harmonic, lead to the auxiliary transformer all to produce great electromagnetic vibration at a very big wide band section, not only influence the structural safety of the converter cabinet body, vibration direct transfer to the carriage floor simultaneously, can influence the travelling comfort that the passenger took, consequently, auxiliary transformer in present stage and future all can hang the lug department at its 4 and install rubber shock absorbers, be used for keeping apart and absorb most electromagnetic vibration, promote converter product quality.
Not only the auxiliary transformer has the vibration reduction requirement, but also the power electronic equipment applied to the rail transit has the urgent vibration reduction requirement. However, when the shock absorber of the power electronic equipment is selected, the shock absorber can be directly selected from other items on the premise of meeting the installation space and the bearing condition easily only by experience, and certain shock absorption effect is achieved. However, this may not maximize the vibration isolation effect of the damper, and may be counterproductive because of improper selection of the damper which may result in severe amplification of the vibration at certain frequencies. Therefore, the proper power electronic equipment shock absorber is selected, the service life of a power electronic equipment product can be prolonged, the body vibration and the vibration transmitted to the vehicle body can be reduced, the competitiveness of the product can be improved, and the riding comfort of passengers can be improved.
Therefore, a fast, effective, highly applicable and accurate model selection design method for the shock absorber of the power electronic device is needed to solve the model selection design problem of the shock absorber of the rail transit power electronic device.
Disclosure of Invention
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
As described above, in order to solve the problem of the prior art that the power electronic equipment vibration damper is not suitable for being selected, the invention provides a simple and accurate method for selecting a vibration damper for damping vibration of power electronic equipment, which comprises the following steps:
determining basic state information of a target shock absorber according to the state information of the power electronic equipment, wherein the basic state information comprises the working environment, the installation size and the bearing capacity of the target shock absorber;
determining an excitation frequency of the target damper according to a power supply frequency of the power electronic device;
determining a target vibration transfer rate of the target damper;
determining a target stiffness of the target damper based on the excitation frequency, the target vibration transmissivity, and a mass of the power electronic device; and
and selecting the shock absorber meeting the basic state information and the target rigidity from a preset shock absorber library as an actual shock absorber.
In an embodiment of the type selecting method, optionally, the type selecting method further includes:
in response to the absence of a shock absorber from the preset shock absorber library that satisfies the base condition information and the target stiffness:
adjusting the target vibration transfer rate of the target vibration absorber within a preset range;
re-determining the target rigidity of the target vibration absorber according to the adjusted target vibration transfer rate; up to
The shock absorber that satisfies the above-described basic state information and the newly determined target stiffness can be selected as the actual shock absorber in a preset shock absorber library.
In an embodiment of the type selecting method, optionally, the type selecting method further includes:
in response to a failure to select a shock absorber satisfying the basic state information and the re-determined target stiffness in a preset shock absorber library by adjusting the target vibration transmissivity, a new type of shock absorber is developed based on the basic state information and the initial target stiffness, and the preset shock absorber library is expanded.
In an embodiment of the type selecting method, optionally, the type selecting method further includes:
and carrying out finite element simulation check on the power electronic equipment provided with the actual shock absorber to verify whether the actual shock absorber meets the shock absorption target.
In an embodiment of the aforementioned sizing method, optionally, in response to the actual shock absorber failing to meet the damping target, the shock absorber that meets the basic state information and the target stiffness is reselected as the actual shock absorber from a preset shock absorber library until the actual shock absorber meets the damping target
The newly selected actual damper can satisfy the damping target.
In an embodiment of the above sizing method, optionally, in response to the damper satisfying both the basic state information and the target stiffness failing to satisfy the damping target:
adjusting the target vibration transfer rate of the target vibration absorber within a preset range;
re-determining the target rigidity of the target vibration absorber according to the adjusted target vibration transfer rate; up to
The actual dampers selected from the preset damper library to satisfy the above-described basic state information and the newly determined target stiffness can satisfy the damping target.
In an embodiment of the type selecting method, optionally, the type selecting method further includes:
and carrying out a vibration damping effect verification test on the power electronic equipment provided with the actual vibration damper so as to verify whether the actual vibration damper meets a vibration damping target.
In an embodiment of the aforementioned sizing method, optionally, in response to the actual shock absorber failing to meet the damping target, the shock absorber that meets the basic state information and the target stiffness is reselected as the actual shock absorber from a preset shock absorber library until the actual shock absorber meets the damping target
The newly selected actual damper can satisfy the damping target.
In an embodiment of the above sizing method, optionally, in response to the damper satisfying both the basic state information and the target stiffness failing to satisfy the damping target:
adjusting the target vibration transfer rate of the target vibration absorber within a preset range;
re-determining the target rigidity of the target vibration absorber according to the adjusted target vibration transfer rate; up to
The actual dampers selected from the preset damper library to satisfy the above-described basic state information and the newly determined target stiffness can satisfy the damping target.
In an embodiment of the aforementioned sizing method, optionally, determining the target vibration transfer rate of the target vibration absorber further includes:
and determining the target vibration transfer rate according to the installation mode of the power electronic equipment.
The invention provides a simple, universal and accurate model selection design method for a subway power electronic equipment shock absorber, which considers a series of flows such as excitation frequency characteristics, vibration isolation rate, natural frequency, system rigidity matching and the like, and provides an accurate, direct and practical method for the model selection design of the shock absorber of the power electronic equipment. According to the model selection design method provided by the invention, a proper shock absorber can be accurately selected for the power electronic equipment, so that the vibration magnitude of the system can be reduced, the passenger riding environment can be improved, the service life of the product can be prolonged, and the comprehensive competitiveness of the product can be improved.
Drawings
The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar relative characteristics or features may have the same or similar reference numerals.
Fig. 1 shows a vibration spectrum characteristic of an auxiliary transformer according to an aspect of the present invention.
FIG. 2 illustrates a flow chart of a method of selecting a type of shock absorber provided in accordance with an aspect of the present invention.
Fig. 3 shows a schematic structural diagram of an alternative type of shock absorber provided by another aspect of the present invention.
Reference numerals
100 type selection device
110 processor
120 memory
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is noted that the aspects described below in connection with the figures and the specific embodiments are only exemplary and should not be construed as imposing any limitation on the scope of the present invention.
The following description is presented to enable any person skilled in the art to make and use the invention and is incorporated in the context of a particular application. Various modifications, as well as various uses in different applications will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to a wide range of embodiments. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
In the following detailed description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the practice of the invention may not necessarily be limited to these specific details. In other instances, well-known structures and devices are shown in block diagram form, rather than in detail, in order to avoid obscuring the present invention.
The reader's attention is directed to all papers and documents which are filed concurrently with this specification and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference. All the features disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
As described above, power electronic equipment applied to rail transit has a demand for vibration reduction. Taking an auxiliary transformer as an example, the subway auxiliary transformer has a characteristic vibration spectrum characteristic, i.e., a comb-tooth-shaped spectrum characteristic of a plurality of single-frequency vibration peaks formed by components of power frequency (50Hz) frequency doubling, IGBT switching frequency doubling and harmonic components thereof, wherein the peaks are mainly concentrated between 50Hz and 6400Hz and are electromagnetic vibrations with a wider frequency band, as shown in fig. 1.
Although the high-frequency vibration component of the transformer is more, the basic high-frequency part is isolated after the vibration isolation effect of the vibration isolation pad. The vibration transmitted to the cabinet body and the vehicle body is mainly low-frequency components below 200Hz, particularly is most obvious at 100Hz (double frequency of power frequency), and the low-frequency vibration can be amplified if the type of the vibration damping pad is not properly selected. Therefore, the selection of the vibration damper for damping the low-frequency vibration of the auxiliary transformer is particularly important, and the vibration damper capable of damping the low-frequency vibration of the auxiliary transformer in a targeted manner needs to be provided.
Similar to the auxiliary transformer, power electronic devices applied to rail transit, such as transformers and reactors, have similar characteristics, and in view of this, an aspect of the present invention provides a method for selecting a type of a shock absorber, which specifically includes:
determining basic state information of the target shock absorber according to the state information of the power electronic equipment, wherein the basic state information comprises the working environment, the installation size and the bearing capacity of the target shock absorber;
determining an excitation frequency of a target damper according to a power supply frequency of the power electronic equipment;
determining a target vibration transmissibility of the target damper;
determining a target stiffness of the target damper according to the excitation frequency, the target vibration transmissibility and the mass of the power electronic device; and
and selecting the shock absorber meeting the basic state information and the target rigidity from a preset shock absorber library as an actual shock absorber.
It will be appreciated that the above-described target damper is an ideal damper capable of meeting damping requirements, installation size requirements, operating environment requirements, and load bearing requirements. The method positions an ideal target shock absorber by comprehensively considering the shock absorption requirement, the installation size requirement, the working environment requirement and the bearing capacity requirement, and then searches the shock absorber matched with the target shock absorber in a preset shock absorber library as an actual shock absorber, thereby realizing the model selection of the shock absorber.
In an embodiment of the model selection method provided by the present invention, in response to that there is no shock absorber in the preset shock absorber library that satisfies the basic state information and the target stiffness, that is, an actual shock absorber matching the target shock absorber cannot be found in the preset shock absorber library, an aspect of the present invention further includes:
adjusting the target vibration transfer rate of the target vibration absorber within a preset range;
re-determining the target rigidity of the target vibration absorber according to the adjusted target vibration transfer rate; up to
The shock absorber that satisfies the basic state information and the re-determined target stiffness can be selected as the actual shock absorber in a preset shock absorber library.
Specifically, the preset range of the target vibration transfer rate may include a plurality of ranges from small to large, and in the above embodiment, the preset range may be sequentially expanded, and the target vibration transfer rate after expanding the range may be selected from the expanded preset range, so as to expand the range of the target stiffness and expand the range of the target damper.
It can be understood that the preset damper library includes a plurality of types of dampers which are already put into engineering application, that is, if a target damper can be found in the preset damper library, the damper can be directly selected and applied to the power electronic equipment.
It is understood that if a proper damper cannot be found in a preset damper library, even in the case of modifying the model selection condition, basic requirements of installation size, working environment and bearing capacity need to be satisfied preferentially, and the three conditions serve as overrules, and if one condition is not satisfied, the damper should be directly excluded. That is, when constructing an ideal target damper, basic state information of the damper, such as the installation size, the working environment, and the magnitude of the bearing force, is not adjusted.
In the model selection method provided by the invention, the installation size in the basic state information of the target damper refers to the available space when the transformer damper is installed, and the upper limit of the length, width and height of the damper is limited. The operating environment requirements in the basic state information refer to the temperature, humidity use range, salt spray environment and the like of the shock absorber.
Still further, according to another aspect of the present invention, the determination of the target vibration transmissivity may be adjusted according to the manner in which the power electronic device is mounted. Still taking the auxiliary transformer as an example, for the auxiliary transformer, the mounting mode is generally the hanging lug suspension mounting, and few have the side-hanging mounting or the direct vertical mounting, and different mounting modes can select a reasonable vibration isolation rate range according to GB 50463. For example, if the auxiliary transformer is mounted in a manner of hanging lug suspension, according to GB 50463, the target vibration isolation ratio is generally less than 0.1, and in general, a range of 0.01 to 0.08 may be selected.
In the above-described embodiment, as a pocket bottom, it is impossible to select a shock absorber that satisfies the basic state information and the newly determined target stiffness in a preset shock absorber library by adjusting the target vibration transmissivity, and then a new type of shock absorber is developed based on the basic state information and the initial target stiffness, and the preset shock absorber library is expanded.
In other words, the range of the target damper cannot be expanded by expanding the range of the target vibration transmission rate, or the damper selected by expanding the range of the target vibration transmission rate cannot actually satisfy the relevant damping requirement. In this case, it is possible to choose to develop a new damper according to the parameters associated with the original target damper, as this raises design and production costs, generally as a secondary option.
In another aspect of the method for selecting a type of a shock absorber provided by the present invention, the method for selecting a type further includes:
and carrying out finite element simulation check on the power electronic equipment provided with the actual shock absorber to verify whether the actual shock absorber meets the shock absorption target.
Further, in response to the actual shock absorber failing to meet the damping target, the shock absorber satisfying the basic state information and the target stiffness is newly selected as the actual shock absorber in the preset shock absorber library until the newly selected actual shock absorber is able to meet the damping target. This corresponds to the possibility of screening out a plurality of vibration dampers from a predetermined damper bank on the basis of the same target vibration transmission rate. Therefore, if a selected shock absorber from the plurality of shock absorbers cannot meet the shock absorption requirement in the finite element simulation check, other shock absorbers from the plurality of shock absorbers can be selected to perform the finite element simulation check, so as to find out a suitable shock absorber from the plurality of shock absorbers.
On the other hand, if the vibration dampers meeting the basic state information and the target rigidity can not meet the vibration damping target, the model selection method provided by the invention can also adjust the target vibration transfer rate of the target vibration damper within a preset range; re-determining the target rigidity of the target vibration absorber according to the adjusted target vibration transfer rate; until the actual damper selected from the preset damper library to satisfy the basic state information and the newly determined target stiffness can satisfy the damping target.
It can be understood that, similar to the situation that a shock absorber matched with a target shock absorber cannot be found in a preset shock absorber library, if an actual shock absorber found in the preset shock absorber cannot meet the shock absorption requirement after finite element simulation check, the range of the suitable shock absorber can be expanded by adjusting the target vibration transmission rate, and the most suitable shock absorber can be found through the finite element simulation check.
It can be understood that the finite element simulation check may include modal analysis, transient dynamics analysis and vibration response analysis in the installation state of the power electronic device, and determine whether the natural frequency of the vibration reduction and isolation system avoids the excitation frequency; transient dynamics calculation of the power electronic equipment is carried out, and whether the dynamic displacement of the vibration reduction and isolation system meets the conditions of installation space limitation and the like is determined; and the vibration transfer rate and response analysis is mainly used for verifying whether the vibration reduction and isolation system achieves the vibration reduction and isolation target. It should be noted that, persons skilled in the art may implement the finite element simulation check in the existing or future manner, and the specific implementation manner of the finite element simulation check should not unduly limit the scope of the present invention.
In another aspect of the method for selecting a type of a shock absorber provided by the present invention, the method for selecting a type further includes:
and carrying out a vibration damping effect verification test on the power electronic equipment provided with the actual vibration damper so as to verify whether the actual vibration damper meets a vibration damping target.
Further, in response to the actual shock absorber failing to meet the damping target, the shock absorber satisfying the basic state information and the target stiffness is newly selected as the actual shock absorber in the preset shock absorber library until the newly selected actual shock absorber is able to meet the damping target. This corresponds to the possibility of screening out a plurality of vibration dampers from a predetermined damper bank on the basis of the same target vibration transmission rate. Therefore, if any one of the plurality of shock absorbers fails to satisfy the damping target in the damping effect verification test, the other shock absorbers of the plurality of shock absorbers may be selected to perform the damping effect verification test to find an appropriate shock absorber from the plurality of shock absorbers.
On the other hand, if the vibration dampers meeting the basic state information and the target rigidity can not meet the vibration damping target, the model selection method provided by the invention can also adjust the target vibration transfer rate of the target vibration damper within a preset range; re-determining the target rigidity of the target vibration absorber according to the adjusted target vibration transfer rate; until the actual damper selected from the preset damper library to satisfy the basic state information and the newly determined target stiffness can satisfy the damping target.
It can be understood that, similar to the situation that a shock absorber matched with a target shock absorber cannot be found in a preset shock absorber library, if an actual shock absorber found out from the preset shock absorbers cannot meet the shock absorption requirement after a shock absorption effect verification test, the range of the suitable shock absorber can be expanded by adjusting the target vibration transfer rate, and the most suitable shock absorber can be further found through the shock absorption effect verification test.
It is to be understood that the above-described vibration damping effect verification test refers to a vibration damping effect verification test of the power electronic device in a state where the vibration damper is mounted. The test can be realized by arranging the vibration acceleration sensors at two ends of the vibration damper (namely a transformer lifting lug and a current transformer cabinet body beam respectively) and collecting vibration data before and after vibration damping of the transformer lifting lug when the current transformer cabinet body is electrified and operated. Specifically, the vibration reduction and isolation effect of the vibration absorber can be evaluated by using the insertion loss, the vibration drop and the transfer function, and the model selection design process of the vibration absorber of the power electronic equipment is completed. It should be noted that, a person skilled in the art may implement the vibration damping effect verification test in an existing or future manner, and the specific implementation manner of the vibration damping effect verification test should not unduly limit the scope of the present invention.
Thus, a particular implementation of the method of selecting a type of shock absorber provided by the present invention has been described. An embodiment of the type selecting method provided by the present invention will be described in detail below with reference to fig. 2. In the following embodiments, the auxiliary transformer is used as an illustration of the power electronic device. The device can be adaptively adjusted for other device equipment in the power electronic equipment.
Referring to fig. 2, it is first necessary to determine the type-selection input condition of the shock absorber, i.e., the input of the basic state information of the target shock absorber. The basic state information comprises the use environment of the shock absorber, the installation size space, the bearing size and various geometric and physical parameters of the damped object. One of the key steps is to identify the excitation frequency of vibration reduction, which is typically 100Hz for auxiliary transformers in power electronics.
The electromagnetic forces in the transformer are mainly generated by magnetic field interactions or magnetic field and conductor current interactions, so that the frequency thereof is related to the magnetic field frequency, and the magnetic field frequency corresponds to the excitation source frequency one to one. The main correspondence is as follows:
where ω is 2 pi f.
Due to the fact that
Thus B-t(N is the number of turns of the coil, and S is the area through which the magnetic flux passes).
And because: current density
(A is the cross-sectional area of turn), therefore J ∈ ItThereby to make
And (3) integrating the sum and difference relation according to trigonometric functions:
sin(a)sin(b)＝-1/2*[cos(a+b)-cos(a-b)] (13)
in a clear view of the above, it is known that,
the above equation reflects that the lorentz force experienced by the conductor is composed of a direct current component and a force wave component of 2 times the power supply frequency. The direct current component does not generate vibration, and the component generating vibration is an exciting force component of 2 times of power supply frequency. Therefore, when the excitation power frequency is 50Hz, the frequency of the generated force wave is 100 Hz.
Secondly, the target vibration transfer rate and the installation mode of the auxiliary transformer are determined. The auxiliary transformer is generally suspended by lifting lugs, the target vibration isolation rate is generally less than 0.1 according to GB 50463, and the range of 0.01-0.08 can be selected under general conditions. Different mounting manners affect the selection of the target vibration isolation rate. Therefore, it is necessary to determine the target vibration transmission rate in a targeted manner according to the manner of mounting the auxiliary transformer.
And then, calculating to obtain the design rigidity of the shock absorber according to the target vibration transmissibility and the system mass, wherein the natural frequency of the main vibration isolation direction (vertical direction) of the vibration isolation system is less than 0.4 time of the excitation frequency (the common knowledge of vibration mechanics, the excitation frequency is more than 2 times of the root of the natural frequency, and the vibration isolation effect is only achieved when the excitation frequency is more than 2 times of the root). The formula mainly used is as follows:
ωnreducing the natural circular frequency (also the natural angular frequency) (rad/s) of the vibration isolation system;
ω — circular frequency of vibration excitation (rad/s) (converted from excitation frequency 100Hz to reduce vibration isolation);
eta, vibration transmissibility of vibration reduction and isolation system;
k-total damper stiffness (N/m);
Ki-stiffness (N/m) of the single shock absorber;
m-auxiliary transformer mass (kg);
n-number of dampers (typically 4).
After the rigidity of the shock absorber is obtained through calculation, the shock absorber which meets the requirements of the design rigidity range (obtained through calculation), the installation size, the use environment, the bearing capacity (basic state information, actual requirements of the field engineering environment) and the like is selected from the existing shock absorber library. If the vibration absorber library of the main vibration absorber supplier contains the vibration absorbers meeting the requirements, various parameters of the vibration absorbers can be obtained, and subsequent simulation and test check can be carried out.
If no suitable damper is available in the library, the relevant parameters need to be adjusted. The basic principle is as follows: firstly, the basic requirements of installation size, working environment and bearing capacity are preferably met, the three conditions are used as overrules, and one condition which is not met is that the damper is directly excluded, namely, the basic state information is not modified. Secondly, when the basic conditions are met, if the vibration absorbers in the library are not in the target vibration isolation rate range, the vibration isolation rate range can be properly widened, the design rigidity is recalculated, and the vibration isolation rate range can be widened from 0.01-0.08 to 0.008-0.15 according to a great deal of practical engineering experience. Finally, when the target isolation rate is relaxed and there are still no suitable dampers in the library, the damper supplier is required to custom develop new dampers, but this raises design and production costs, generally as a secondary option.
After obtaining various parameters of the shock absorber, in general, finite element simulation check is needed. It can be understood that the subsequent installation test verification link can be directly entered under the conditions of simple structure, short development period and the like. The finite element simulation mainly comprises the steps of calculating the mode and the natural frequency of the transformer in the installation state, and determining whether the natural frequency of the vibration reduction and isolation system avoids the excitation frequency; transient dynamics calculation of the transformer is carried out, and whether the dynamic displacement of the vibration reduction and isolation system meets the conditions of installation space limitation and the like is determined; and the vibration transfer rate and response analysis is mainly used for verifying whether the vibration reduction and isolation system achieves the vibration reduction and isolation target. Meanwhile, if the selected shock absorber does not meet the requirements, the shock absorber can be reselected according to the situation, or the shock absorber can be reselected after the target rigidity is adjusted.
And after finite element simulation check, carrying out installation test verification on the selected shock absorber, namely carrying out a shock absorption effect verification test on the transformer in a shock absorber installation state. Specifically, the vibration acceleration sensors can be arranged at two ends of the vibration damper (respectively at the transformer lifting lug and the current transformer cabinet beam), and when the current transformer cabinet is powered on and operated, vibration data of the transformer lifting lug before and after vibration reduction is acquired. The vibration reduction and isolation effect of the vibration absorber can be evaluated by using the insertion loss, the vibration drop and the transfer function, and the model selection design process of the auxiliary transformer vibration absorber is completed. Similarly, if the selected damper is not satisfactory, the damper may be reselected according to the situation, or after the target stiffness is adjusted, the damper may be reselected.
In conclusion, the invention provides a model selection design method flow of a shock absorber, which is applied to rail transit power electronic equipment. The model selection method of the vibration absorber provided by the invention provides a numerical calculation method for the design rigidity of the vibration absorption system for determining the excitation frequency and the target vibration transfer rate based on the vibration characteristics of power electronic equipment and engineering experience. The method for selecting the type of the shock absorber can recommend a proper method for selecting the type and developing the shock absorber according to engineering practice and on the premise of cost reduction and efficiency improvement. Meanwhile, the invention achieves the design method for realizing the accurate model selection of the shock absorber for the transformer by utilizing specific numerical calculation, finite element simulation and test verification.
The invention is applied to the design method for the type selection of the shock absorber of the power electronic equipment of the rail transit, solves the problem of the type selection of the shock absorber depending on experience or a single mode, avoids the phenomena of poor vibration isolation effect, resonance, large deformation and the like caused by improper type selection of the shock absorber, has clear flow and definite design target, provides theoretical and method basis for the vibration attenuation design of a converter and a transformer, and has obvious engineering guidance significance for the structure optimization design of the converter and the transformer.
In another aspect of the present invention, a model selection device for a shock absorber is provided, and referring to fig. 3, fig. 3 shows the model selection device. As shown in fig. 3, the aforementioned type selection apparatus 100 includes a processor 110 and a memory 120. The processor 110 of the aforementioned type selection apparatus 100 can implement the aforementioned type selection method when executing the computer program stored in the memory 120, for which reference is specifically made to the aforementioned description about the type selection method, which is not repeated herein.
The invention also provides a computer storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the above-described method of typing. For details, please refer to the above description of the type selection method, which is not repeated herein.
The method, apparatus and computer readable storage medium for selecting a type of shock absorber provided by the present invention have been described so far. The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.
In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software as a computer program product, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a web site, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk (disk) and disc (disc), as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks (disks) usually reproduce data magnetically, while discs (discs) reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
Claims (12)
1. A method of sizing a vibration damper for damping vibration for a power electronic device, comprising:
determining basic state information of a target shock absorber according to the state information of the power electronic equipment, wherein the basic state information comprises the working environment, the installation size and the bearing capacity of the target shock absorber;
determining an excitation frequency of the target damper according to a power supply frequency of the power electronic device;
determining a target vibration transfer rate of the target vibration damper;
determining a target stiffness of the target damper from the excitation frequency, the target vibration transmissivity, and a mass of the power electronics device; and
and selecting the vibration absorber meeting the basic state information and the target rigidity from a preset vibration absorber library as an actual vibration absorber.
2. The typing method according to claim 1, wherein the typing method further comprises:
in response to the absence of a shock absorber from the preset bank of shock absorbers meeting the base status information and the target stiffness:
adjusting the target vibration transfer rate of the target vibration absorber within a preset range;
re-determining the target rigidity of the target vibration absorber according to the adjusted target vibration transfer rate; up to
The shock absorber satisfying the basic state information and the re-determined target stiffness can be selected as an actual shock absorber in a preset shock absorber library.
3. The typing method according to claim 2, wherein the typing method further comprises:
in response to failing to select a shock absorber satisfying the basic state information and the re-determined target stiffness in a preset shock absorber library by adjusting a target vibration transmissivity, developing a new type of shock absorber based on the basic state information and the initial target stiffness, and expanding the preset shock absorber library.
4. The typing method according to claim 1, wherein the typing method further comprises:
and carrying out finite element simulation check on the power electronic equipment provided with the actual shock absorber to verify whether the actual shock absorber meets a shock absorption target.
5. The model selection method as claimed in claim 4, wherein in response to said actual shock absorber failing to meet a damping target, a shock absorber satisfying said basic state information and said target stiffness is reselected as an actual shock absorber from a preset shock absorber library until said actual shock absorber satisfies said basic state information and said target stiffness
The newly selected actual damper can satisfy the damping target.
6. The typing method as set forth in claim 5, wherein in response to none of the dampers meeting the base state information and the target stiffness meeting a damping target:
adjusting the target vibration transfer rate of the target vibration absorber within a preset range;
re-determining the target rigidity of the target vibration absorber according to the adjusted target vibration transfer rate; up to
The actual shock absorber selected from a preset shock absorber library to satisfy the basic state information and the re-determined target stiffness can satisfy the shock absorption target.
7. The typing method according to claim 1, wherein the typing method further comprises:
and carrying out a vibration damping effect verification test on the power electronic equipment provided with the actual vibration damper so as to verify whether the actual vibration damper meets a vibration damping target.
8. The model selection method as claimed in claim 7, wherein in response to said actual shock absorber failing to meet a damping target, a shock absorber satisfying said basic state information and said target stiffness is reselected as an actual shock absorber from a preset shock absorber library until said actual shock absorber satisfies said basic state information and said target stiffness
The newly selected actual damper can satisfy the damping target.
9. The typing method as set forth in claim 8, wherein in response to none of the dampers meeting the base state information and the target stiffness meeting a damping target:
adjusting the target vibration transfer rate of the target vibration absorber within a preset range;
re-determining the target rigidity of the target vibration absorber according to the adjusted target vibration transfer rate; up to
The actual shock absorber selected from a preset shock absorber library to satisfy the basic state information and the re-determined target stiffness can satisfy the shock absorption target.
10. The model selection method as defined in claim 1, wherein determining a target vibration transmissivity of the target vibration damper further comprises:
and determining the target vibration transfer rate according to the installation mode of the power electronic equipment.
11. A sizing device for a shock absorber, said sizing device comprising: a processor, a memory, and a computer program stored on the memory and executable on the processor, the processor configured to:
the steps of performing the typing method according to any one of claims 1 to 10.
12. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the typing method according to any one of claims 1 to 10.
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