CN104135248A - Filter system and method - Google Patents
Filter system and method Download PDFInfo
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- CN104135248A CN104135248A CN201410351426.1A CN201410351426A CN104135248A CN 104135248 A CN104135248 A CN 104135248A CN 201410351426 A CN201410351426 A CN 201410351426A CN 104135248 A CN104135248 A CN 104135248A
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Abstract
The present application provides a filter system, comprising a hardware filter circuit and a processor connected with the hardware filter circuit. With the filter system provided in the present application, the whole filtering process is accomplished by initially performing the low-pass filtering of first preset frequency-band signals with the hardware filter circuit for the signals to be filtered, reducing the frequency bands entering the processor and then continuing to perform the filtering of second preset frequency-band signals for signals by the processor according to second preset frequency-band signal filtering conditions. During that process, since the hardware filter circuit filters the signals to be filtered, enabling the frequency bands of the first filter signals entering the processor to meet the requirements of less and lower frequency bands, filtering that meets the accuracy requirement can be achieved by only processing the signals of less frequency bands by the processor. It has small data processing amount in the whole filter system, is shorter in time used for computing and is advantageous for the subsequent analytical apparatus to analyze the operation status of train body in time, to meet the high real-time demands of in-situ application and to ensure the operation security of train.
Description
Technical field
The present invention relates to signal process field, in particular, relate to a kind of filtering system and method.
Background technology
Train in running, due to reasons such as track irregularities, the hunting that train wheel there will be, wheel is double swerve in track, and moves forward according to certain amplitude, figure acceptance of the bid shows the wavelength X of hunting.Along with the also corresponding raising of frequency of the proportional hunting of train running speed, this frequency approaches the right eigentone of wheel, more easily occurs the operation of crawling of self-excited vibration.In the time that train running speed reaches critical speed, once there is serpentine locomotion, no matter train speed remains certain or continues is improved, the amplitude of hunting can strengthen gradually, there is horizontal unstability, wheel edge and rail generation sharp impacts, circuit and wheel can be seriously damaged, ride quality sharply worsens, and the danger of derailing can occur when serious.
Therefore, the how movement vibration stability of support vehicles under high-speed cruising state, becomes the major issue that affects safe train operation.
In prior art, adopt detection car body bogie transverse vibration acceleration to judge whether to occur horizontal unstability, when this acceleration repeatedly meets or exceeds critical value, judge that horizontal unstability has occurred train, need take corresponding safety measure.
But because the signal of transducer output is the sophisticated signal that frequency band is very wide, contain a large amount of high order harmonic components and interference noise, signal to noise ratio is lower, need to carry out filtering processing to extract useful signal to this sophisticated signal.
In prior art, the general software filtering that adopts, by building digital filter, realize the signal of transducer output is carried out to filtering, the schematic diagram of filtering of the prior art as shown in Figure 1, transducer 101 inspection vehicle running body signals generate signal to be filtered, and digital filter 102 carries out filtering processing to signal, and export analytical equipment 103 to and analyze.
Because software filtering is realized by numerical computations, for ensureing the precision of filtering, need to be by higher the setting of filtering exponent number, as 1024 rank.But in the time improving filtering exponent number, software needs data volume to be processed to increase, even need the calculating of magnanimity, cause the time of filtering to increase, produce time delay, cause follow-up analytical equipment to car body running state analysis not in time, can exert an influence to train operating safety.
Summary of the invention
In view of this, the invention provides a kind of filtering system and method, solved the problem that data amount of calculation that available technology adopting software filtering causes causes greatly time delay.
For achieving the above object, the invention provides following technical scheme:
A kind of filtering system, comprising: hardware filtering circuit and processor;
Described hardware filtering circuit, carries out the low-pass filtering of the first default frequency band signals for treating filtering signal, obtain the first filtering signal;
Described processor is connected with described hardware filtering circuit, for according to the second default frequency band signals filtering condition, described the first filtering signal being carried out to filtering, obtains the second filtering signal output.
Above-mentioned system, preferred, also comprise:
The sample circuit being connected with described hardware filtering circuit, for the signal of transducer output is sampled, obtains signal to be filtered.
Above-mentioned system, preferred, also comprise:
The post processing electric circuit being connected with described processor, requires described the second filtering signal to process for the input parameter according to subsequent analysis equipment, obtains the 3rd filtering signal, and exports described the 3rd filtering signal to described analytical equipment.
Above-mentioned system, preferred, also comprise:
The analog/digital A/D modular converter being connected with described processor with described hardware filtering circuit respectively, for the first filtering signal of described hardware filtering circuit output is converted to digital form by analog form, and exports described processor to.
Above-mentioned system, preferred, described hardware filtering circuit is the frequency overlapped-resistable filter on Pyatyi seven rank, described frequency overlapped-resistable filter comprises: first order filtering, second level filtering, third level filtering, fourth stage filtering and level V filtering;
Wherein, first and second, Pyatyi is filtered into single order active low-pass filter, third and fourth level is filtered into second order active low-pass filter.
Above-mentioned system, preferred, described processor adopting digital signal processor DSP, field programmable gate array FPGA or complex programmable logic device (CPLD).
Above-mentioned system, preferred, described digital filter software comprises: endless impulse response IIR or have limit for length's impulse response FIR.
A kind of filtering method, comprising:
Hardware filtering circuit is treated filtering signal and is carried out the first default frequency band signals filtering, obtains the first filtering signal;
Processor carries out filtering according to the second default frequency band signals filtering condition to described the first filtering signal, obtains the second filtering signal output.
Above-mentioned method, preferred, hardware filtering circuit is treated before filtering signal carries out the first default frequency band signals filtering, also comprises:
Sample circuit is sampled to the signal of transducer output, obtains signal to be filtered, and signal to be filtered is sent to hardware filtering circuit.
Above-mentioned method, preferred, also comprise:
Post processing electric circuit requires described the second filtering signal to process according to the input parameter of subsequent analysis equipment, obtains the 3rd filtering signal, and exports described the 3rd filtering signal to described analytical equipment.
Known via above-mentioned technical scheme, compared with prior art, the invention provides a kind of filtering system, comprise: hardware filtering circuit and the processor being connected with this hardware filtering circuit, the filtering system that adopts the application to provide, first adopt hardware filtering circuit to low-pass filtering of carrying out the first default frequency band signals to be filtered, reduce the signal frequency range that enters processor, then this processor is proceeded the second default frequency band signals filtering according to the second default frequency band signals filtering condition to signal, completes whole filtering.In this process, because hardware filtering circuit is treated filtering signal and is carried out filtering, make the frequency range of the first filtering signal that enters processor meet the requirement that frequency range is less and lower, only need this processor to process and can realize the filtering that meets required precision the signal of less frequency range, data processing amount in whole filtering system is little, calculating is shorter service time, is beneficial to follow-up analytical equipment car body running status is analyzed in time, ensures train operating safety.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
Fig. 1 is the schematic diagram of filtering of the prior art;
The structural representation of a kind of filtering system embodiment 1 that Fig. 2 provides for the application;
Another structural representation of a kind of filtering system embodiment 1 that Fig. 3 provides for the application;
The structural representation of a kind of filtering system embodiment 2 that Fig. 4 provides for the application;
The structural representation of a kind of filtering system embodiment 3 that Fig. 5 provides for the application;
The structural representation of a kind of filtering system embodiment 4 that Fig. 6 provides for the application;
The circuit diagram of the middle hardware filtering circuit of a kind of filtering system embodiment 4 that Fig. 7 provides for the application;
The flow chart of a kind of filtering method embodiment 1 that Fig. 8 provides for the application;
The flow chart of a kind of filtering method embodiment 2 that Fig. 9 provides for the application;
The flow chart of a kind of filtering method embodiment 3 that Figure 10 provides for the application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
A kind of filtering system and the method that in the application, relate to, be used to the signal analysis equipment of train that the useful signal of filtering interference signals and high order harmonic component is provided.
The structural representation of a kind of filtering system embodiment 1 that the application as shown in Figure 2 provides, this filtering system comprises: hardware filtering circuit 201 and processor 202;
Wherein, this hardware filtering circuit 201 is connected with processor 202.
Described hardware filtering circuit 201, carries out the low-pass filtering of the first default frequency band signals for treating filtering signal, obtain the first filtering signal;
Wherein, this first default frequency range is the cut-off frequency of this hardware filtering circuit, and concrete, the cut-off frequency of hardware filtering circuit can be set as Fp=50Hz, and this first default frequency range is signal more than 50Hz frequency.
Concrete, hardware filtering circuit 201 is treated target signal filter more than the 50Hz frequency in filtering signal, and the signal of 0～50Hz frequency is retained, and the signal of 0～50Hz frequency that this remains is the first filtering signal.
Concrete, this hardware filtering circuit is made up of devices such as operational amplifier, resistance, electric capacity, and the corresponding circuit that amplifier forms of single-section filter, in the time adopting different circuit structure, can realize the filtering characteristic of single-order, second order or higher exponent number.In actual enforcement, for reaching the effect of setting, generally multi-stage filter circuit is cascaded up, every grade arranges different rank, bandpass characteristics (low pass, high pass, band lead to) and cut-off frequency.Concrete implementation can be done specific explanations in follow-up embodiment, and the present embodiment is not explained in detail.
It should be noted that, the high frequency band signal in this hardware filtering circuit filtering signal to be filtered, the signal of reservation lower frequency, so that follow-up processor 202 is processed the signal of lower frequency by the digital filter software of low order.
It should be noted that, hardware filtering circuit can adopt different sum of series exponent numbers, does not affect the function of this filtering system.
It should be noted that, in concrete enforcement, this hardware circuit also can be provided with enlarging function, in the time of the occasion that is applied to low signal-to-noise ratio of this filtering system, can realize the signal to noise ratio that promotes signal, avoid occurring the distortion situation of useful signal in the time that Low SNR signal is processed, so that follow-up processor is processed more accurate to signal.
Described processor 202, for according to the second default frequency band signals filtering condition, described the first filtering signal being carried out to filtering, obtains the second filtering signal output.
Wherein, in processor 202, be provided with low-order digit filter software, this digital filter software comprises: IIR (Infinite impact Response, endless impulse response) or FIR (Finite impact Response, has limit for length's impulse response).
Wherein, the exponent number of this digital filter software can be set according to the condition of filtering in reality enforcement, as 512 rank; The filtering frequency range of this digital filter software also can be set according to the condition of filtering in reality enforcement, as logical in high pass, low pass or band.
Concrete, this processor carries out 2～12.6Hz frequency band signals to the signal of input and carries out bandpass filtering, also can carry out amplitude compensation to filtered signal, so that the signal amplitude of output meets the requirement of follow-up analytical equipment.
Concrete, when processor 202 receives after the first filtering signal that hardware filtering circuit 201 exports, its embedded digital filter software carries out the filtering of the second default frequency band signals to this first filtering signal, this second default frequency range is corresponding with specifically arranging of this digital filter software.
Wherein, this second filtering signal is that signal to be filtered is distinguished after filtering through hardware filtering circuit 201 and processor 202, the signal that meets required precision obtaining, and this signal may be output to analytical equipment, to analyze the characteristic of this signal, show whether train horizontal unstability situation occurs.
In concrete enforcement, this processor adopting DSP (Digital Signal Processor, digital signal processor), FPGA (Field Programmable Gate Array, field programmable gate array) or CPLD (Complex Programmable Logic Device CPLD).
It should be noted that, because hardware filtering circuit is by the filtering of the high-frequency signal in signal to be filtered, retain the signal of lower frequency, make this digital filter software process the signal of lower frequency, this digital filter software only need be set to low order, and the data processing amount of digital filter software is little.
Because software filtering exists a constant time lag that affected by filtering exponent number, signal sampling rate, and this time delay cannot reduce by Optimization Software code, and this digital filter software only need arrange low order filtering in the application, reduce the constant time lag time, improve the real-time of filtering.
Concrete, in the time adopting FIR, because this FIR filter itself exists inherent delay t ≈ N/f, wherein N is filtering exponent number, f is sample frequency, therefore,, for obtaining reasonable time delay, need to select suitable N and f, concrete, available sampling frequency is 500Hz, and time delay is controlled to 1s left and right, can meet the requirement of on-the-spot application.
It should be noted that, exponent number, the sample rate etc. of software filtering can be adjusted, and the function of this filtering system is constant.
It should be noted that, in the application, first adopt hardware filtering circuit to carry out High frequency filter, then adopt processor to carry out low frequency filtering, but be not limited to this, in actual enforcement, the sequencing of the process of hardware filtering and software filtering can be exchanged as required, to realize the process of compound filter.
Another structural representation of a kind of filtering system embodiment 1 that the application as shown in Figure 3 provides, in this structure, filtering system comprises: hardware filtering circuit 301, A/D (Analog-to-digital, analog/digital) modular converter 302 and processor 303;
Wherein, this A/D modular converter 302 is arranged between hardware filtering circuit 301 and processor 303, is converted to digital form for the first filtering signal that described hardware filtering circuit 301 is exported by analog form, and exports described processor 303 to.
Wherein, the first filtering signal of exporting when this hardware filtering circuit 301 is analog form, and these processor 303 input request signals are while being digital signal, and this A/D modular converter is converted to digital form by this first filtering signal by analog form.
It should be noted that, the filtering system providing in the present embodiment combines the advantage of software digital filter and hardware digital filtering, has avoided the defect of software digital filter.By the configuration of different parameters, aspect the real-time of filtering accuracy and processing, obtaining equilibrium, be applicable to the real-time control under site environment.
To sum up, a kind of filtering system that the present embodiment provides, comprise: hardware filtering circuit and the processor being connected with this hardware filtering circuit, the filtering system that adopts the application to provide, first adopt hardware filtering circuit to low-pass filtering of carrying out the first default frequency band signals to be filtered, reduce the signal frequency range that enters processor, then this processor is proceeded the second default frequency band signals filtering according to the second default frequency band signals filtering condition to signal, completes whole filtering.In this process, because hardware filtering circuit is treated filtering signal and is carried out filtering, make the frequency range of the first filtering signal that enters processor meet the less requirement of frequency range, only need this processor to process and can realize the filtering that meets required precision the signal of less frequency range, data processing amount in whole filtering system is little, calculating is shorter service time, is beneficial to follow-up analytical equipment car body running status is analyzed in time, ensures train operating safety.
The structural representation of a kind of filtering system embodiment 2 that the application as shown in Figure 4 provides, this filtering system comprises: sample circuit 401, hardware filtering circuit 402, processor 403;
Wherein, this sample circuit 401 is connected with hardware filtering circuit 402, and hardware filtering circuit 402 is connected with processor 403.
Wherein, hardware filtering circuit 402 is consistent with the corresponding construction function in embodiment 1 with processor 403, and the present embodiment repeats no more.
Sample circuit 401, for the signal of transducer output is sampled, obtains signal to be filtered.
Wherein, transducer detects car body bogie transverse vibration motion conditions, the very wide and sophisticated signal that contains a large amount of high order harmonic components and interference noise of the signal bandwidth of its output.
Concrete, sample circuit 401 is sampled to the signal of this transducer output, obtains signal to be filtered, and this signal to be filtered is sent in hardware filtering circuit 402, to carry out follow-up filtering.
It should be noted that, in concrete enforcement, this sample circuit not only can be sampled, and also can carry out the early stages such as transformation of scale to signal and process, so that enter the service conditions that the signal to be filtered of hardware filtering circuit adapts to hardware filtering circuit most.
To sum up, a kind of filtering system that the present embodiment provides, also comprises: sample circuit, for the signal of transducer output is sampled, obtains signal to be filtered, and signal to be filtered is exported in hardware filtering circuit, to carry out follow-up filtering.
The structural representation of a kind of filtering system embodiment 3 that the application as shown in Figure 5 provides, this filtering system comprises: hardware filtering circuit 501, processor 502 and post processing electric circuit 503;
Wherein, this hardware filtering circuit 501 is connected with processor 502, and processor 502 is connected with this post processing electric circuit 503.
Wherein, hardware filtering circuit 501 is consistent with the corresponding construction function in embodiment 1 with processor 502, and the present embodiment repeats no more.
Post processing electric circuit 503, requires described the second filtering signal to process for the input parameter according to subsequent analysis equipment, obtains the 3rd filtering signal, and exports described the 3rd filtering signal to described analytical equipment.
Wherein, the input parameter requirement of default coupled subsequent analysis equipment in this post processing electric circuit 503 in advance, this input parameter requires to comprise: waveforms amplitude scope, the frequency range etc. of input signal.
Wherein, when the input parameter that does not meet this analytical equipment when the second filtering signal of this processor output requires, this post processing electric circuit 503 is processed and is obtained the 3rd filtering signal this second filtering signal, the 3rd filtering signal meets the input parameter requirement of this subsequent analysis equipment, to make this analytical equipment according to the transverse vibration acceleration situation of train body bogie corresponding to the 3rd filtering signal Accurate Analysis signal to be filtered that meets input parameter requirement, judge whether train occurs horizontal unstability situation, avoid occurring because the amplitude of the second filtering signal is too small or excessive, cause the analysis of analytical equipment to occur larger error.
Concrete, when the input parameter that the amplitude (or signal strength signal intensity) of the second filtering signal of exporting when this processor 502 does not meet analytical equipment requires, this post processing electric circuit is processed this second filtering signal, so that it meets the input parameter requirement of analytical equipment.
Concrete, this post processing electric circuit 503 also can comprise D/A (Digital-to-Analog, digital-to-analog) module, and the second filtering signal that processor 502 is exported is converted to analog signal by digital signal, for subsequent analysis device processes.
Certainly, this post processing electric circuit also can be adjusted other parameters of the second filtering signal, so that it meets the input requirements of analytical equipment, in the present embodiment, repeats no more.
To sum up, a kind of filtering system that the present embodiment provides, also comprise: post processing electric circuit, require described the second filtering signal to process for the input parameter according to subsequent analysis equipment, obtain the 3rd filtering signal, and export described the 3rd filtering signal to described analytical equipment, so that analytical equipment is according to the transverse vibration acceleration situation of train body bogie corresponding to the 3rd filtering Accurate Analysis signal to be filtered that meets its input parameter requirement, judge whether train occurs horizontal unstability situation.
The structural representation of a kind of filtering system embodiment 5 that the application as shown in Figure 6 provides, comprising: hardware filtering circuit 601 and processor 602;
Wherein, processor 602 is consistent with the corresponding construction function in embodiment 1, and the present embodiment repeats no more.
Concrete, the hardware filtering circuit adopting in the present embodiment is the frequency overlapped-resistable filter on Pyatyi seven rank, this anti-aliasing filter implement body comprises: first order filtering, second level filtering, third level filtering, fourth stage filtering and level V filtering, wherein: first and second, Pyatyi is filtered into single order active low-pass filter, third and fourth level is filtered into second order active low-pass filter.
Be specially, signal to be filtered is the active low pass of single order (first order filtering) 603 successively, the active low pass of single order (second level filtering) 604, the active low pass of second order (third level filtering) 605, the active low pass of second order (fourth stage filtering) 606, after the active low pass of single order (level V filtering) 607 filtering, export the first filtering signal to processor 602, so that processor 602 is realized follow-up software filtering process, finally obtain may be output to the second filtering signal of subsequent analysis equipment, to realize the object for the treatment of filtering signal and carrying out the first default frequency band signals filtering.
As Fig. 7 shows the circuit diagram of hardware filtering circuit, first order filter circuit 701, second level filter circuit 702 ... level V filter circuit 705 connects successively.
It should be noted that, adopt multi-stage filter circuit, every grade arranges different exponent numbers, bandpass characteristics and cut-off frequency, and every grade of filter circuit coordinates the filtering of realize target frequency, and precision is higher.
To sum up, in a kind of filtering system that the present embodiment provides, hardware filtering circuit is the frequency overlapped-resistable filter on Pyatyi seven rank, wherein: first and second, Pyatyi is filtered into single order active low-pass filter, third and fourth level is filtered into second order active low-pass filter.This hardware filtering circuit is treated filtering signal and is carried out the filtering on Pyatyi seven rank, and the first filtering signal that filtering is obtained exports processor to, and every grade of filter circuit coordinates the filtering of realize target frequency, and precision is higher.
A kind of filtering system embodiment providing with above-mentioned the application is corresponding, and the application also provides a kind of filtering method embodiment.
As Fig. 8 shows the flow chart of a kind of filtering method embodiment 1 that the application provides, comprising:
Step S801: hardware filtering circuit is treated filtering signal and carry out the low-pass filtering of the first default frequency band signals, obtains the first filtering signal;
Wherein, this first default frequency range is the cut-off frequency of this hardware filtering circuit, and concrete, the cut-off frequency of hardware filtering circuit can be set as Fp=50Hz, and this first default frequency range is signal more than 50Hz frequency.
Concrete, hardware filtering circuit 201 is treated target signal filter more than the 50Hz frequency in filtering signal, and the signal of 0～50Hz frequency is retained, and the signal of 0～50Hz frequency that this remains is the first filtering signal.
Concrete, this hardware filtering circuit is made up of devices such as operational amplifier, resistance, electric capacity, and the corresponding circuit that amplifier forms of single-section filter, in the time adopting different circuit structure, can realize the filtering characteristic of single-order, second order or higher exponent number.In actual enforcement, for reaching the effect of setting, generally multi-stage filter circuit is cascaded up, every grade arranges different rank, bandpass characteristics (low pass, high pass, band lead to) and cut-off frequency.Concrete implementation can be done specific explanations in follow-up embodiment, and the present embodiment is not explained in detail.
It should be noted that, the high frequency band signal in this hardware filtering circuit filtering signal to be filtered, the signal of reservation lower frequency, so that follow-up processor is processed the signal of lower frequency by the digital filter software of low order.
It should be noted that, hardware filtering circuit can adopt different sum of series exponent numbers, does not affect the function of this filtering system.
It should be noted that, in concrete enforcement, this hardware circuit also can be provided with enlarging function, in the time of the occasion that is applied to low signal-to-noise ratio of this filtering system, can realize the signal to noise ratio that promotes signal, avoid occurring the distortion situation of useful signal in the time that Low SNR signal is processed, so that follow-up processor is processed more accurate to signal.
Step S802: processor carries out filtering according to the second default frequency band signals filtering condition to described the first filtering signal, obtains the second filtering signal output.
Wherein, be provided with low-order digit filter software in processor, this digital filter software comprises: IIR or FIR.
Wherein, the exponent number of this digital filter software can be set according to the condition of filtering in reality enforcement, as 512 rank; The filtering frequency range of this digital filter software also can be set according to the condition of filtering in reality enforcement, as logical in high pass, low pass or band.
Concrete, this processor carries out 2～12.6Hz frequency band signals to the signal of input and carries out bandpass filtering, also can carry out amplitude compensation to filtered signal, so that the signal amplitude of output meets the requirement of follow-up analytical equipment.
Concrete, when processor receives after the first filtering signal of hardware filtering circuit output, its embedded digital filter software carries out the filtering of the second default frequency band signals to this first filtering signal, this second default frequency range is corresponding with specifically arranging of this digital filter software.
Wherein, this second filtering signal is that signal to be filtered is distinguished after filtering through hardware filtering circuit and processor, the signal that meets required precision obtaining, and this signal may be output to analytical equipment, to analyze the characteristic of this signal, show whether train horizontal unstability situation occurs.
In concrete enforcement, this processor adopting DSP, FPGA or CPLD.
It should be noted that, because hardware filtering circuit is by the filtering of the high-frequency signal in signal to be filtered, retain the signal of lower frequency, make this digital filter software process the signal of lower frequency, this digital filter software only need be set to low order, and the data processing amount of digital filter software is little.
Because software filtering exists a constant time lag that affected by filtering exponent number, signal sampling rate, and this time delay cannot reduce by Optimization Software code, and this digital filter software only need arrange low order filtering in the application, reduce the constant time lag time, improve the real-time of filtering.
Concrete, in the time adopting FIR, because this FIR filter itself exists inherent delay t ≈ N/f, wherein N is filtering exponent number, f is sample frequency, therefore,, for obtaining reasonable time delay, need to select suitable N and f, concrete, available sampling frequency is 500Hz, and time delay is controlled to 1s left and right, can meet the requirement of on-the-spot application.
It should be noted that, exponent number, the sample rate etc. of software filtering can be adjusted, and the function of this filtering system is constant.
It should be noted that, in the application, first adopt hardware filtering circuit to carry out High frequency filter, then adopt processor to carry out low frequency filtering, but be not limited to this, in actual enforcement, the sequencing of the process of hardware filtering and software filtering can be exchanged as required, to realize the process of compound filter.
To sum up, a kind of filtering method that the present embodiment provides, comprise: first adopt hardware filtering circuit to low-pass filtering of carrying out the first default frequency band signals to be filtered, reduce the signal frequency range that enters processor, then this processor is proceeded the second default frequency band signals filtering according to the second default frequency band signals filtering condition to signal, completes whole filtering.In this process, because hardware filtering circuit is treated filtering signal and is carried out filtering, make the frequency range of the first filtering signal that enters processor meet the less requirement of frequency range, only need this processor to process and can realize the filtering that meets required precision the signal of less frequency range, data processing amount in whole filtering system is little, calculating is shorter service time, is beneficial to follow-up analytical equipment car body running status is analyzed in time, ensures train operating safety.
As Fig. 9 shows the flow chart of a kind of filtering method embodiment 2 that the application provides, comprising:
Step S901: sample circuit is sampled to the signal of transducer output, obtains signal to be filtered, and signal to be filtered is sent to hardware filtering circuit;
Wherein, transducer detects car body bogie transverse vibration motion conditions, the very wide and sophisticated signal that contains a large amount of high order harmonic components and interference noise of the signal bandwidth of its output.
Concrete, sample circuit is sampled to the signal of this transducer output, obtains signal to be filtered, and this signal to be filtered is exported in hardware filtering circuit, to carry out follow-up filtering.
It should be noted that, in concrete enforcement, this sample circuit not only can be sampled, and also can carry out the early stages such as transformation of scale to signal and process, so that enter the service conditions that the signal to be filtered of hardware filtering circuit adapts to hardware filtering circuit most.
Step S902: hardware filtering circuit is treated filtering signal and carried out the first default frequency band signals filtering, obtains the first filtering signal;
Step S903: processor carries out the second default frequency band signals filtering according to the low-order digit filter software arranging to described the first filtering signal, obtains the second filtering signal output;
Wherein, step S902-903 is consistent with the step S801-802 in embodiment 1, and the present embodiment repeats no more.
To sum up, a kind of filtering method that the present embodiment provides, also comprises: sample circuit is sampled to the signal of transducer output, obtains signal to be filtered, and signal to be filtered is exported in hardware filtering circuit, to carry out follow-up filtering.
As Figure 10 shows the flow chart of a kind of filtering method embodiment 2 that the application provides, comprising:
Step S1001: hardware filtering circuit is treated filtering signal and carried out the first default frequency band signals filtering, obtains the first filtering signal;
Step S1002: processor carries out filtering according to the second default frequency band signals filtering condition to described the first filtering signal, obtains the second filtering signal output;
Wherein, step S1001-1002 is consistent with the step S801-802 in embodiment 1, and the present embodiment repeats no more.
Step S1003: post processing electric circuit requires described the second filtering signal to process according to the input parameter of subsequent analysis equipment, obtains the 3rd filtering signal, and export described the 3rd filtering signal to described analytical equipment.
Wherein, the input parameter requirement of default coupled subsequent analysis equipment in this post processing electric circuit in advance, this input parameter requires to comprise: waveforms amplitude scope, the frequency range etc. of input signal.
Wherein, when the input parameter that does not meet this analytical equipment when the second filtering signal of this processor output requires, this post processing electric circuit is processed and is obtained the 3rd filtering signal this second filtering signal, the 3rd filtering signal meets the input parameter requirement of this subsequent analysis equipment, to make this analytical equipment according to the transverse vibration acceleration situation of train body bogie corresponding to the 3rd filtering signal Accurate Analysis signal to be filtered that meets input parameter requirement, judge whether train occurs horizontal unstability situation, avoid occurring because the amplitude of the second filtering signal is too small or excessive, cause the analysis of analytical equipment to occur larger error.
Concrete, when the input parameter that does not meet analytical equipment when the amplitude (or signal strength signal intensity) of the second filtering signal of this processor output requires, this post processing electric circuit is processed this second filtering signal, so that it meets the input parameter requirement of analytical equipment.
Concrete, this post processing electric circuit also can comprise D/A module, the second filtering signal of processor output is converted to analog signal by digital signal, for follow-up analytical equipment processing.
Certainly, this post processing electric circuit also can be adjusted other parameters of the second filtering signal, so that it meets the input requirements of analytical equipment, in the present embodiment, repeats no more.
To sum up, a kind of filtering method that the present embodiment provides, also comprise: post processing electric circuit requires described the second filtering signal to process according to the input parameter of subsequent analysis equipment, obtain the 3rd filtering signal, and export described the 3rd filtering signal to described analytical equipment, so that analytical equipment is according to the transverse vibration acceleration situation of train body bogie corresponding to the 3rd filtering Accurate Analysis signal to be filtered that meets its input parameter requirement, judge whether train occurs horizontal unstability situation.
Claims (10)
1. a filtering system, is characterized in that, comprising: hardware filtering circuit and processor;
Described hardware filtering circuit, carries out the low-pass filtering of the first default frequency band signals for treating filtering signal, obtain the first filtering signal;
Described processor is connected with described hardware filtering circuit, for according to the second default frequency band signals filtering condition, described the first filtering signal being carried out to filtering, obtains the second filtering signal output.
2. system according to claim 1, is characterized in that, also comprises:
The sample circuit being connected with described hardware filtering circuit, for the signal of transducer output is sampled, obtains signal to be filtered.
3. system according to claim 1, is characterized in that, also comprises:
The post processing electric circuit being connected with described processor, requires described the second filtering signal to process for the input parameter according to subsequent analysis equipment, obtains the 3rd filtering signal, and exports described the 3rd filtering signal to described analytical equipment.
4. system according to claim 1, is characterized in that, also comprises:
The analog/digital A/D modular converter being connected with described processor with described hardware filtering circuit respectively, for the first filtering signal of described hardware filtering circuit output is converted to digital form by analog form, and exports described processor to.
5. system according to claim 1, it is characterized in that, described hardware filtering circuit is the frequency overlapped-resistable filter on Pyatyi seven rank, and described frequency overlapped-resistable filter comprises: first order filtering, second level filtering, third level filtering, fourth stage filtering and level V filtering;
Wherein, first and second, Pyatyi is filtered into single order active low-pass filter, third and fourth level is filtered into second order active low-pass filter.
6. system according to claim 1, is characterized in that, described processor adopting digital signal processor DSP, field programmable gate array FPGA or complex programmable logic device (CPLD).
7. system according to claim 1, is characterized in that, described digital filter software comprises: endless impulse response IIR or have limit for length's impulse response FIR.
8. a filtering method, is characterized in that, comprising:
Hardware filtering circuit is treated filtering signal and is carried out the first default frequency band signals filtering, obtains the first filtering signal;
Processor carries out filtering according to the second default frequency band signals filtering condition to described the first filtering signal, obtains the second filtering signal output.
9. method according to claim 8, is characterized in that, hardware filtering circuit is treated before filtering signal carries out the first default frequency band signals filtering, also comprises:
Sample circuit is sampled to the signal of transducer output, obtains signal to be filtered, and signal to be filtered is sent to hardware filtering circuit.
10. method according to claim 8, is characterized in that, also comprises:
Post processing electric circuit requires described the second filtering signal to process according to the input parameter of subsequent analysis equipment, obtains the 3rd filtering signal, and exports described the 3rd filtering signal to described analytical equipment.
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