CN108039982A - A kind of DSP platform control system Bandwidth Measurement Method based on network interface - Google Patents
A kind of DSP platform control system Bandwidth Measurement Method based on network interface Download PDFInfo
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- CN108039982A CN108039982A CN201711250745.3A CN201711250745A CN108039982A CN 108039982 A CN108039982 A CN 108039982A CN 201711250745 A CN201711250745 A CN 201711250745A CN 108039982 A CN108039982 A CN 108039982A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0876—Network utilisation, e.g. volume of load or congestion level
- H04L43/0894—Packet rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/50—Testing arrangements
Abstract
The invention discloses a kind of DSP platform control system Bandwidth Measurement Method based on network interface, belong to automatic control system bandwidth measurement field, it is not accurate enough to solve measurement of the time domain approach to system bandwidth, the problem of frequency domain method or system are larger, cost is high or is caused distorted signals method by output condition restriction, this method produces sine sweep pumping signal using DSP, and the method for being exported control signal to host computer by network interface realizes control system bandwidth measurement.Sinusoidal excitation signal for frequency sweep is produced by DSP, without the dynamic signal analyzer that spare interface connection volume is larger；Swept frequency excitation signal, control signal and swept frequency value are exported by network interface, ensure that signal is undistorted during high frequency frequency sweep；Host computer based on network interface will receive data and be exported by established form, and convenient relatively output signal output difference in magnitude and phase difference, system bandwidth respective frequencies point are very clear.
Description
Technical field
The invention belongs to automatic control system bandwidth measurement field, it is related in DSP platform control system and is based on network interface
System Bandwidth Measurement Method.
Background technology
When control system is more demanding to the response speed of signal in servo-actuated stabilized platform, it is necessary to system design in order to control
Higher bandwidth.
Control system using DSP as main control chip can determine system band by the method for frequency response or step response
It is wide.Usual step response can only estimate bandwidth value by empirical equation, and the method cannot in the case of controlled device has resonance
Accurately whether definite resonant frequency point in bandwidth of operation, and control system has the risk for producing and shaking during normal work.By
Dynamic signal analyzer can very easily complete system frequency response test, it is only necessary to according to system input/output signal amplitude
Codomain setting dynamic signal analyzer parameter, but on condition that platform leaves signal input output interface, to ensure control
System is connected with dynamic signal analyzer.Swept frequency excitation signal is completed by DSP to produce, and frequency sweep data are exported by serial ports, are used
Matlab plotting modes analyze amplitude and the difference of phase and pumping signal can obtain system control bandwidth, this method connection letter
List, realize conveniently, but frequency sweep data output rate is restricted by serial port baud rate, and when swept frequency is higher, output control signal is lost
Very, it is impossible to correct measurement system bandwidth value.
In said system bandwidth determining method, measurement of the time domain approach to system bandwidth is not accurate enough, frequency domain method or is
Uniting, larger, cost is high or is caused distorted signals by output condition restriction.
The content of the invention
In view of the above problems, the present invention proposes a kind of DSP platform control system Bandwidth Measurement Method based on network interface, use
In the measurement for realizing control system bandwidth, network interface high transfer rate is avoided that distorted signals, ensure that the standard of system bandwidth measurement
True property, practice result show that this method measuring system bandwidth has that connection is simple, realizes convenient characteristic.
The present invention technical solution be：A kind of DSP platform control system Bandwidth Measurement Method based on network interface, the party
Method includes the description below：
(1) DSP generates pumping signal
DSP produces swept frequency excitation signal, and pumping signal is sinusoidal excitation signal；
(2) control system is according to pumping signal frequency sweep
Control system calculates motor control signal, abbreviation control signal according to input signal, and control signal drives negative
Carry tracking pumping signal and carry out sine sweep movement, periodic recording pumping signal, control signal and frequency sweep frequency are pressed during frequency sweep
Rate, and encapsulated three as frequency sweep data；
(3) frequency sweep data are exported by network interface
Using pumping signal as command value, control signal is worth in response, according to command value, the priority of response and frequency
Sequential organization becomes network interface data frame, and network interface data frame is sent to host computer according to DSP calculating cycles；
(4) host computer receives and resolves frequency sweep data
Host computer sends frequency sweep control command and data, receiving frequency-sweeping data, and completes data calculation according to given protocol,
Preserve to form data file by column vector form；
(5) frequency sweep data analysis
Data file is imported frequency sweep three curves of data are drawn in matlab, when response decays to bid value
At 0.707 times, corresponding frequency values are as bandwidth frequency ω Hz.
Preferably, a kind of above-mentioned DSP platform control system Bandwidth Measurement Method based on network interface, it is characterised in that root
Determine that DSP calculates frequency according to Control System Design bandwidth, calculate 10 times of frequency system design bandwidth in order to control.
Preferably, above-mentioned a kind of DSP platform control system Bandwidth Measurement Method based on network interface, it is characterised in that according to
According to formula：ControlData=Asin (2 π ft) generates sinusoidal excitation signal and calculates control signal, wherein
Signal, A are excitation signal amplitude to ControlData in order to control, and f is sweep sine frequency, and t is DSP calculating cycles.
Preferably, above-mentioned a kind of DSP platform control system Bandwidth Measurement Method based on network interface, it is characterised in that swash
Encourage signal amplitude A, frequency sweep initial frequency value fstart, frequency sweep terminate frequency values fstopWith frequency sweep change step Δ f by host computer
Set and send to DSP.
Preferably, above-mentioned a kind of DSP platform control system Bandwidth Measurement Method based on network interface, it is characterised in that sweep
Each Frequency point carries out p sinusoidal frequency response test during frequency.
Preferably, above-mentioned a kind of DSP platform control system Bandwidth Measurement Method based on network interface, it is characterised in that swash
Encourage signal amplitude A, frequency sweep initial frequency value fstart, frequency sweep terminate frequency values fstopIt is host computer with frequency sweep change step Δ f
The data of transmission, while host computer sends the frequency sweep control command that frequency sweep starts, frequency sweep terminates.
Preferably, above-mentioned a kind of DSP platform control system Bandwidth Measurement Method based on network interface, it is characterised in that press
Column vector form preserves to form data file：Command value is first row, response is secondary series and frequency values are the 3rd row.
This method produces sine sweep pumping signal using DSP, is exported control signal to the side of host computer by network interface
Method realizes control system bandwidth measurement, its feature is, the sinusoidal excitation signal for frequency sweep is produced by DSP, is connect without reserved
The larger dynamic signal analyzer of mouth connection volume；Swept frequency excitation signal, control signal and swept frequency value are exported by network interface, are protected
Signal is undistorted when demonstrate,proving high frequency frequency sweep；Host computer based on network interface will receive data and be exported by established form, convenient relatively to export
Export signal amplitude difference and phase difference, system bandwidth respective frequencies point are very clear.
Compared with the prior art, the invention has the advantages that：
1) pumping signal is independently generated using DSP, saves the use of apparatus and equipment, reduce experimental system scale.
2) data transfer is completed using network interface, avoids the defects of serial port baud rate is low, high speed data transfer ensures frequency sweep
During export signal it is undistorted.
3) swept-frequency signal amplitude and frequency can be adjusted by upper computer software, enable experimental system according to actual control system
Frequency sweep scheme is formulated, there is stronger versatility.
Brief description of the drawings
Fig. 1 is a kind of system composition of DSP platform control system Bandwidth Measurement Method based on network interface.
Fig. 2 is pumping signal product process figure.
Fig. 3 is network data frame composition figure in DSP.
Fig. 4 is upper computer software data processing and preserves flow chart.
Embodiment
The present invention is described in further detail below.
A kind of DSP platform control system Bandwidth Measurement Method based on network interface, this method comprise the following steps：
(1) DSP generates sinusoidal excitation signal
Determine that DSP calculates frequency according to Control System Design bandwidth and aromatic sampling thheorem, it is considered that calculating frequency is
It can ensure that frequency sweep result is accurate during 10 times of design bandwidth.According to formula：ControlData=Asin (2 π ft) generations are sinusoidal to swash
Encourage signal and calculate control signal, signal, A are excitation signal amplitude to wherein ControlData in order to control, and f is swept-sine
Signal frequency, t are DSP calculating cycles, A, fstartInitial frequency value, fstopTerminate frequency values and change step Δ f by upper
Machine sets and sends to DSP, and each Frequency point carries out p sinusoidal frequency response test during frequency sweep；It is each during frequency sweep
Frequency point carries out multiple sinusoidal frequency response test.
(2) control system is according to pumping signal frequency sweep
Control system calculates motor control signal according to input signal, and control signal drives load tracking pumping signal
Carry out sine sweep movement, press periodic recording pumping signal, control signal and swept frequency during frequency sweep, and using three as
Frequency sweep data encapsulate；
(3) frequency sweep data are exported by network interface
Using pumping signal as command value, control signal is worth in response, according to command value, the priority of response and frequency
Sequential organization becomes network interface data frame, and network interface data frame is sent to host computer according to DSP calculating cycles；
(4) host computer receives and resolves frequency sweep data
Host computer be based on MFC using CSocket classes complete, using in udp protocol SendTo functions send control command with
Data, OnReceive function receiving frequency-sweeping data, and according to given protocol complete data calculation, by column vector form preserve to
File；
(5) frequency sweep data analysis
Data file is imported frequency sweep three curves of data are drawn in matlab, when response decays to bid value
At 0.707 times, corresponding frequency values are as bandwidth frequency ω Hz.
Also there is following content：
(1) it is made of using the system of this method three parts：Host computer, DSP and equipment under test.Wherein, host computer
It is responsible for receiving frequency-sweeping and resolves frequency sweep data, and data is write into file according to specified format；DSP control system is responsible for generation and is swept
Frequency pumping signal, and motor control signal driving motor is calculated according to pumping signal, while frequency sweep data sending is organized to upper
Computer；Equipment under test receives motor control signal, and tracks pumping signal according to control signal, completes frequency sweep action.System
Composition is as shown in Figure 1；
(2) generating process of pumping signal using f and Δ f as shown in Fig. 2, calculate pumping signal current frequency fc, profit
Use fcCalculate sinusoidal excitation signal cycle T0, work as T0Change seasonal N=0, M=0, T=Nt, and wherein N is DSP calculating cycles
Number, calculates plus 1, MS is frequency response number, each sinusoidal cycles add 1, that is, work as T=T every time0When M add 1 as M=p fc=fc+
Δ f, realizes the frequency response signal per p sinusoidal cycles Frequency；
(3) by the frequency sweep command value A in frequency sweep datac, response AbMultiply respectively according to required precision is retained with frequency value F
With scale value 10x, successively write network interface send caching array SendData [m], according to DSP calculating cycles by network interface send to
Host computer, data frame composition form are as shown in Figure 3；
(4) upper computer software receives and resolves frequency sweep data flow as shown in figure 4, concrete methods of realizing is：Host computer is soft
Part is based on udp protocol, and SendTo () function, which is sent, in socket (Socket) starts frequency sweep order, and sends A, f and Δ
F, while receive network data using OnReceive () function in Socket, network data is unpacked to obtain frequency command value, sound
It should be worth and frequency values, sentence scale value 10 respectivelyxObtain Ac、AbAnd F, will by column vector using Write () function in CFile classes
Data are written in column in data file ScanData.txt, wherein AcFor first row, AbFor secondary series, F is the 3rd row.
(5) ScanData.txt files are imported in matlab, draws frequency sweep three curves of data, observe Ab=0.707
×AcWhen frequency values be denoted as FωAs control system bandwidth value.
Claims (7)
1. a kind of DSP platform control system Bandwidth Measurement Method based on network interface, it is characterised in that this method is included in following
Hold：
(1) DSP generates pumping signal
DSP produces swept frequency excitation signal, and pumping signal is sinusoidal excitation signal；
(2) control system is according to pumping signal frequency sweep
Control system according to input signal calculate motor control signal, abbreviation control signal, control signal band dynamic load with
Track pumping signal carries out sine sweep movement, and periodic recording pumping signal, control signal and swept frequency are pressed during frequency sweep, and
Encapsulated three as frequency sweep data；
(3) frequency sweep data are exported by network interface
Using pumping signal as command value, control signal is worth in response, according to command value, the sequencing of response and frequency
Tissue becomes network interface data frame, and network interface data frame is sent to host computer according to DSP calculating cycles；
(4) host computer receives and resolves frequency sweep data
Host computer sends frequency sweep control command and data, receiving frequency-sweeping data, and completes data calculation according to given protocol, by row
Vector format preserves to form data file；
(5) frequency sweep data analysis
Data file is imported frequency sweep three curves of data are drawn in matlab, when response decays to 0.707 times of bid value
When, corresponding frequency values are as bandwidth frequency ω Hz.
2. a kind of DSP platform control system Bandwidth Measurement Method based on network interface according to claim 1, its feature exist
In determining that DSP calculates frequency according to Control System Design bandwidth, calculate 10 times of frequency system design bandwidth in order to control.
3. a kind of DSP platform control system Bandwidth Measurement Method based on network interface according to claim 1, its feature exist
According to formula：ControlData=Asin (2 π ft) generates sinusoidal excitation signal and calculates control signal, wherein
Signal, A are excitation signal amplitude to ControlData in order to control, and f is sweep sine frequency, and t is DSP calculating cycles.
4. a kind of DSP platform control system Bandwidth Measurement Method based on network interface according to claim 1, its feature exist
In excitation signal amplitude A, frequency sweep initial frequency value fstart, frequency sweep terminate frequency values fstopWith frequency sweep change step Δ f by upper
Position machine sets and sends to DSP.
5. a kind of DSP platform control system Bandwidth Measurement Method based on network interface according to claim 1, its feature exist
In each Frequency point carries out p sinusoidal frequency response test during frequency sweep.
6. a kind of DSP platform control system Bandwidth Measurement Method based on network interface according to claim 1, its feature exist
In excitation signal amplitude A, frequency sweep initial frequency value fstart, frequency sweep terminate frequency values fstopWith frequency sweep change step Δ f be on
The data that position machine is sent, while host computer sends the frequency sweep control command that frequency sweep starts, frequency sweep terminates.
7. a kind of DSP platform control system Bandwidth Measurement Method based on network interface according to claim 1, its feature exist
In preserving to form data file by column vector form：Command value is first row, response is secondary series and frequency values are the 3rd
Row.
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| CN109212413A (en) * | 2018-08-14 | 2019-01-15 | 瑞声科技(新加坡)有限公司 | Linear motor Bandwidth Measurement Method |
| CN109445769A (en) * | 2018-10-16 | 2019-03-08 | 天津津航技术物理研究所 | The test software development approach of dynamically load communication protocol based on database |
| CN109472846A (en) * | 2018-12-27 | 2019-03-15 | 燕山大学 | The method for obtaining Bode diagram with MATLAB processing frequency sweep data |
| CN112558586A (en) * | 2020-11-30 | 2021-03-26 | 天津津航技术物理研究所 | Embedded software-based frequency sweep test method for airborne stable platform |
| CN117516666A (en) * | 2023-11-16 | 2024-02-06 | 北京首科实华自动化设备有限公司 | Quality factor measuring equipment and method for coriolis flowmeter |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109212413A (en) * | 2018-08-14 | 2019-01-15 | 瑞声科技(新加坡)有限公司 | Linear motor Bandwidth Measurement Method |
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| CN109445769A (en) * | 2018-10-16 | 2019-03-08 | 天津津航技术物理研究所 | The test software development approach of dynamically load communication protocol based on database |
| CN109445769B (en) * | 2018-10-16 | 2021-08-06 | 天津津航技术物理研究所 | Test software development method for dynamic loading communication protocol based on database |
| CN109472846A (en) * | 2018-12-27 | 2019-03-15 | 燕山大学 | The method for obtaining Bode diagram with MATLAB processing frequency sweep data |
| CN109472846B (en) * | 2018-12-27 | 2022-11-29 | 燕山大学 | Method for obtaining bode diagram by processing sweep frequency data by MATLAB |
| CN112558586A (en) * | 2020-11-30 | 2021-03-26 | 天津津航技术物理研究所 | Embedded software-based frequency sweep test method for airborne stable platform |
| CN117516666A (en) * | 2023-11-16 | 2024-02-06 | 北京首科实华自动化设备有限公司 | Quality factor measuring equipment and method for coriolis flowmeter |
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