CN101029856A - System for measuring and analyzing digital-controlled machine-tool dynamic characteristic - Google Patents
System for measuring and analyzing digital-controlled machine-tool dynamic characteristic Download PDFInfo
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Abstract
A test and analysis system of digital machine process-dynamics character comprises hardware prepared as arranging acceleration transducer at tail end of cutter, connecting hammer and said transducer to electric charge amplifier being connected to data collector and carrying out data transmission with computer by said collector; and software formed by man-machine interactive boundary and module of data collection, data play-back, hammering test, transmission function analysis, parameter identification, noise test and analysis.
Description
(1) technical field:
The present invention is a kind of system for measuring and analyzing digital-controlled machine-tool dynamic characteristic (DynaCut), is specifically related to the digital-controlled machine-tool dynamic characteristic research, belongs to the CNC processing technology field.
(2) background technology:
In recent years, digital control processing occupied ratio in the mechanical processing industry of China was more and more heavier, and digital control processing replaces standard machinery processing to become irreversible trend.In order to improve the development level of China's weaponry, China has introduced a large amount of numerical control devices, but the effect that these equipment is brought into play has only external part.Efficiency of numerical control (NC) machining has lowly become a general problem, has not only seriously restricted the China's national defense industrial expansion, and has caused the enormous economic loss and the wasting of resources.
The one of the main reasons that digital control processing application technology level is low is: lack numerical control technological parameter and selection and optimization method.Selecting rational cutting parameter for use is to improve numerically-controlled machine application technology level and the most direct method of overall efficiency, numerical control (NC) Machining simulation and optimisation technique are to obtain the optimal path of optimum cutting parameter data, and data acquisition and analysis process system are the bases of carrying out numerical control (NC) Machining simulation and optimization, and it provides digital control processing process policy and optimizes needed a series of parameter.In the digital control processing process, cutting force, vibration situation, workpiece deformation and surfaceness etc. all are to weigh working angles quality whether important symbol.Because the processing quality of actual milling process is closely related with the dynamics of the process system that " lathe-cutter-workpiece " constitutes, therefore to the test of numerically-controlled machine milling process dynamics with analyze the cutting ability that can effectively improve lathe, be the research direction that numerous theoretical research person and technologist do one's utmost always.
(3) summary of the invention:
A kind of system for measuring and analyzing digital-controlled machine-tool dynamic characteristic of the present invention, its objective is: the test analysis that carries out the digital-controlled machine-tool dynamic characteristic by the scene, obtain the frequency characteristic and the modal parameter of " lathe-cutter-workpiece " process system, as the basis of numerical control (NC) Machining simulation and parameter optimization.
A kind of system for measuring and analyzing digital-controlled machine-tool dynamic characteristic of the present invention, this system partly is made up of hardware platform and software systems two;
This hardware platform includes: cutting tool for CNC machine 1, power hammer 2, acceleration transducer 3, charge amplifier 4, the data acquisition unit 7 with USB (universal serial bus) (USB interface), microphone 12 and portable computer 11; Hardware structure diagram as shown in Figure 1.
This acceleration transducer 3 adopts clay to be bonded at the end of cutting tool for CNC machine 1, this power hammer 2 links to each other with charge amplifier 4 by signal wire with acceleration transducer 3, charge amplifier 4 and data acquisition unit 7 link to each other by cable, and data acquisition unit 7 is realized data transmission with computing machine 11 by the usb data line;
This data acquisition unit 7 is core components of the hardware components of system, the performance index that must satisfy: range ± 5v, port number is 4 the tunnel parallel, modulus (AD) conversion accuracy is 12, the highest sample frequency 50kHz of every passage, microphone 12 links to each other with microphone 12 interfaces of computer sound card, is responsible for gathering the noise signal in the process.
These software systems include following module, and its general structure frame and each functional module specify as follows:
1. main interface provides the inlet that enters each functional module and main human-computer interaction interface; (Fig. 2);
2. data acquisition module: gather the data that sensor transmitted are distortionless, and the data of the gathering form according to tens digit is stored in the computing machine;
3. data readback module: read the data file of having stored, data are shown to the user with wave form or array form check, carry out later stage off-line statistical study;
4. hammering experiment module: machine tool system is carried out the hammering experiment, and collection power and response signal show time domain waveform, and time-domain signal is done fast Flourier (FFT) conversion, obtain frequency domain characteristic, and preserve the time-domain signal data;
5. pass the letter analysis module: hammering is tested the data rate of doing work analysis of spectrum that collects and asked average, calculate system transter and preservation, show amplitude frequency diagram, phase frequency figure, and calculate the reliability of coefficient of coherence judgement transport function;
6. modal parameter recognition module: system transter is carried out the mode match, on the basis of match, calculate modal parameters such as natural frequency, damping ratio, rigidity and preserve;
7. noise testing and analysis module: the voice signal of gathering in the lathe process is also made fft analysis, obtains the noise frequency domain characteristic, judges the vibration situation in the process.
The function of this each functional module of software systems specifically describes as follows:
1. human-computer interaction interface:
After system's operation, can at first call software startup arena face, occur man-machine interaction master interface then, as shown in Figure 3, select the required functional module of calling, click the corresponding functional modules button, will eject the front panel figure of corresponding functional modules; Is its program circuit: the value of at first initialization-next step execution software for display animation-next step execution inquiry state machine-accuse and equal zero?, call data acquisition module if equal zero then to carry out; Otherwise whether inquiry equals 1, if equaling 1 execution calls the data readback module, otherwise whether inquiry equals 2, carries out the hammering experiment if then carry out; Otherwise whether inquiry equals 3, passes the letter analysis module if carry out to call; Otherwise whether inquiry equals 4, calls the modal parameter recognition module if carry out; Otherwise whether inquiry equals 5, calls noise testing and analysis module if carry out; Otherwise carrying out to withdraw from-Ruo do not withdraw from and then turns back to the value of carrying out the inquiry state machine, stop if withdrawing from then to carry out; As shown in Figure 4;
2. data acquisition module:
Left side at the acquisition parameter configuration interface (Fig. 5) of data acquisition module is the parameter of the required input of functional module: sample frequency, sampling number, buffer zone quantity, initial channel, total number of channels, ceiling voltage limit (being highest measurement voltage), minimum voltage limit (being minimum measuring voltage); The user set just can enter that waveform shows behind the above-mentioned parameter and the data acquisition interface in begin to start capture program; The right side can not be modified for from the information that data acquisition unit read;
In demonstration of data acquisition module waveform and data storage interface (Fig. 6), can view the current real system sample frequency input data acquisition date and the storing path of data file, click preservation data button just can be saved as data the data file in the computing machine, and the form of support is text * .txt and Excel file * .xls; Meanwhile in array display interface (Fig. 7), can check the real time data point that is stored in the calculator memory array, the program development flow process of data acquisition module is: at first initialization-next step execution is called dynamic link library (DLL) if if array shows and waveform shows if function-next step carry out to take out that buffer data-next step carries out that translation operation-next step carries out that data recombination-next step is carried out simultaneously-next step is carried out storage data-do not store data and return-store data then carry out next step and write data-next step execution and withdraw from-withdraw from then carry out and withdraw from module, otherwise inquires and whether press exit button; As shown in Figure 8;
3. data readback module:
The data readback module mainly is to carry out off-line ground for the data that former institute is gathered and preserves to analyze, the data file of having stored that selection need be called, click playback button, just can in waveform display interface (Fig. 9), see the waveform of data file, show in (Figure 10) with the two-dimensional table format video data in array simultaneously, is data readback modular program development process is: at first the value of file path-execution query State machine-equal zero called in initialization-execution? equal zero and turn back to the value of query State machine, if read file-carry out display waveform simultaneously and whether array demonstrations-next step inquiry quits a program-then withdraw from otherwise carry out, otherwise continuation inquires whether press " exit button "; As shown in figure 11;
4. hammering experiment module:
In the hammering experiment module, need carry out the sampling parameter setting, comprise the channel number of setting analysis frequency, sampling number, number of taps, sampling trigger voltage, the channel number of gathering impulsive force, collection response, the calibration value of power and response, the filename of data storage file and path etc.; Two curve maps in right side (Figure 12) show the impulsive force gathered and the time-domain signal of response, and are stored in the computing machine with document form; Hammering experiment module development process: if at first initialization-next step execution is provided with sampling parameter-next step wait knocked-whether next step inquiry would have force signal input-otherwise turn back to and wait for and knocking, if then carry out next step collection power and response signal-next step carry out simultaneously display waveform and storage data-inquire simultaneously number of taps wait for and knocking otherwise return to carry out whether greater than setting total degree-if then withdraw from module; As shown in figure 13;
5. pass the letter analysis module:
In passing the letter analysis module, read in the signal file that the hammering experiment is gathered, and in interface (Figure 14), show experimental configuration information.Knock the force signal and the response signal that obtain to N time respectively and make fft analysis and power spectrumanalysis, utilize calculation formulae of frequency response function:
Obtain the frequency response function data of system, and utilize the calculating formula of coherence function:
Judge the test mass and the reliability of frequency response function; Passing letter analysis module development process is: at first initialization-next step execution opens that the image data file-next step is carried out, and to show that acquisition configuration parameter-next step carries out that FFT (fast fourier transform)-next step carries out that power spectrum conversion-next step carries out power spectrum average-next step carry out calculate frequency response function-next step carry out respectively simultaneously show amplitude frequency diagram, phase frequency figure, coefficient of coherence figure-next step is carried out and preserves frequency response function data; As shown in figure 15;
6. modal parameter recognition module:
In the modal parameter recognition module, read in acceleration and pass function according to file, be converted into displacement and pass function certificate and demonstration in interface (Figure 16), the frequency range and the match exponent number of input match, utilize the rational fraction orthogonal polynomial that it is carried out curve fitting, on the basis of curve fitting, obtain natural frequency, damping ratio, modal parameters such as rigidity, the model analysis flow process is: initialization-next step execution open pass function according to file-next step execution be converted to displacement pass function according to-next step determine the match frequency range-next step carry out determine that the match exponent number-next step is carried out curve fitting-next step carry out fitting result and show-next step inquiry whether to the result satisfied-dissatisfied then turn back to carry out determine the match frequency range, if satisfied then carry out next step and ask for that modal parameter-next step is carried out and preserves modal parameter data; As shown in figure 17;
7. noise testing and analysis module:
In noise testing and the analysis module, at first carry out the sampling parameter setting, form, acquisition rate and acquisition time etc. are gathered in setting, and the software startup sound card begins to gather, and system reads in data and shows from buffer zone, and collection is closed sound card after finishing.The voice signal that collects is made fft analysis, obtain the amplitude versus frequency characte of signal and at interface display (Figure 18), noise testing and analysis process are: at first initialization-next step execution be provided with sampling parameter-next step carry out to start sound card-next step execution read buffer data-next step inquiry sampling whether finish-if then carry out and close sound card, read that buffer data-next step is carried out respectively simultaneously, and display waveform and storage data-next step is carried out and selects that signal time section-next step is carried out, and fft analysis-next step is carried out respectively simultaneously and shows the amplitude-frequency waveform otherwise turn back to, measure fundamental frequency; As shown in figure 20.
A kind of system for measuring and analyzing digital-controlled machine-tool dynamic characteristic of the present invention, its advantage and positive effect are:
Can carry out on-the-spot test and analysis easily at processing site, system architecture is simple and clear, and is reliable, easy to operate; Compare with the traditional test instrument, improved testing efficiency and precision greatly, and reduced testing cost, effect is good.
(4) description of drawings:
Fig. 1 system hardware synoptic diagram in kind.
Fig. 2 software systems global design scheme.
Fig. 3 data acquisition and analysis software master interface.
Fig. 4 man-machine interaction master interface program process flow diagram.
Fig. 5 data collecting module collected parameter configuration interface.
Fig. 6 data acquisition module waveform shows and the data storage interface.
Fig. 7 data acquisition module data array display interface.
Fig. 8 data acquisition module process flow diagram.
Fig. 9 data readback module waveform display interface.
Figure 10 data readback module array display interface.
Figure 11 data readback module process flow diagram.
Figure 12 hammering experiment module interface.
Figure 13 hammering experiment module process flow diagram.
Figure 14 passes letter analysis module interface.
Figure 15 passes letter analysis module process flow diagram.
Figure 16 mode match interface.
Figure 17 mode match process flow diagram.
Figure 18 noise acquisition interface.
Figure 19 noise analysis interface.
Figure 20 noise testing and analysis process figure.
Figure 21 hammering experimental technique synoptic diagram.
Number in the figure is as follows:
1 cutting tool for CNC machine, 2 power are hammered 3 acceleration transducers into shape
The positive 6 charge amplifier back sides of 4 charge amplifiers, 5 charge amplifiers
The positive 9 data acquisition unit back sides of 7 data acquisition units, 8 data acquisition units
10 data acquisition unit usb 1s, 1 computing machine, 12 microphones
13 computing machine usb 1s, 4 computing machine microphone interfaces
(5) embodiment:
A kind of system for measuring and analyzing digital-controlled machine-tool dynamic characteristic of the present invention, the experiment test method is a single-point excitation single-point response method, see also shown in Figure 21, accelerometer is installed on the point of a knife of milling cutter, power hammer 2 opposite sides at cutting tool for CNC machine 1, cutting tool for CNC machine 1 is encouraged, obtain the two-way charge signal by power hammer 2 and accelerometer, through charge amplifier 4, data acquisition unit 7 arrives computing machine 11 internal memories, and software is sense data and demonstration from computing machine 11 internal memories, save as text file format, and carry out fft analysis to recording data, pass the letter analysis, model analysis.Hardware cooperates frequency response function (FRF) file and all modal parameters of acquisition " lathe-cutter-workpiece " with software, as the basis of dynamics simulation and parameter optimization.At a machine tool one cutter, the X that needs in machine coordinates respectively carry out hammering experiment on the Y direction, obtain X respectively, the biography function certificate on the Y direction.Concrete implementation step is as follows:
At first build system hardware, it is as follows to build step:
(1) impulsive force hammer 2 and subsidiary cable are connected, need tighten, must not become flexible, otherwise can occur unusual.
(2) cable that power is hammered into shape 2 cables and acceleration transducer 3 is connected with charge amplifier 4, and power is hammered 2 cables into shape and is connected to electric charge input I end, and the accelerometer cable is connected to electric charge input II end.
(3) output terminal of charge amplifier 4 is connected with data acquisition unit response input channel, output I termination data acquisition unit CH0 end, output II terminates to data acquisition unit CH1 end.
(4) data acquisition unit 7 connects by the USB connecting line with portable computer 11.
(5) with clay acceleration transducer 3 is bonded on the point of a knife securely.
After system hardware is built and finished, carry out the setting of charge amplifier 4, corresponding passage of charge amplifier 4 left panels and the setting of power hammer parameter, corresponding two passages of right panel and accelerometer parameter are provided with, and it is as follows that charge amplifier 4 is provided with step:
The charge/voltage selector switch of (1) two passage is put the electric charge place;
(2) two passages straight-through/put every straight place every heading straight for to close;
The function selecting of (3) two passages is linear;
(4) size of selecting electric charge to gain according to the power of charge signal, for example, if the value of passage is less, as 100～200mv, and range 5000mv does not make full use of range fully, should increase the gain multiple, and two channel charges gain default setting is 0.1;
(5) select the low-pass filtering shelves according to the size of want analysis frequency frequency band, default value is 5000Hz;
(6) set the suitable numerical value of transferring sensitivity, the suitable accent sensitivity number of one passage need be consistent with force transducer Default Value value, the suitable accent sensitivity number of two passages need be consistent with acceleration transducer Default Value value, for example, the Sensitirity va1ue of acceleration transducer: 0.392Pc/m/s2, then the numerical value of suitable accent sensitivity is 392.
So far setting completed for system hardware, begins to carry out the hammering experiment.
The hammering experimental procedure is as follows:
1. at first carry out the sampling parameter setting, it is as follows that sampling parameter is provided with step:
(1) by drop-down menu analysis frequency is set, determines the size of sample frequency, analysis frequency numerical value will be complementary with the charge amplifier low-pass filtering value of setting, is defaulted as 5000Hz;
(2) input experiment name is provided with the file storing path, and the acquired signal data are kept under the specified path to test filename by name;
(3) the input experiment number is determined the number of taps of power hammer in the hammering experiment, increases the measurement number of times and can reduce noise, is defaulted as 5 times;
The calibration value size of (4) input power and response.The calibration value size of power is 100 times of charge amplifier left panel electric charge yield value; Response calibration value size is 10 times (charge amplifier electric charge yield value default setting is 0.1, and then the power calibration value is defaulted as 10, and the response calibration value is defaulted as 1) of charge amplifier right panel electric charge yield value.
2. sampling parameter is provided with after the end, the beginning image data, and the image data step is as follows:
Click begins to gather button, and system begins to wait for triggering, if experiment number is made as 5, then carries out 5 times and knocks, the power that waveform display interface (Figure 12) demonstration is knocked each time and the waveform of response.Knock the inquiry of end rear interface ejection dialog box knocks next time or knocks again at every turn.As double hit (be power and response wave shape show for once impact) does not take place and remove impact portion exceptionally signal value be 0, then click " OK " button and knock next time, heavily strike otherwise need to click " CANCEL " button.
After the hammering experiment finishes, hammering experiment module storage file is passed the letter analysis.It is as follows to pass the letter analytical procedure:
(1) in main interface, clicks biography letter analysis button, enter and pass letter analysis module interface.
(2) select the data file that to analyze, click and pass the letter analysis button, show the sampling parameter configuration information when knocking experiment in the file data parameter box in left side, interface (Figure 14), comprise number of taps, sample frequency, analysis frequency, sampling number, the time interval, frequency interval.The right side, interface shows amplitude frequency diagram, phase frequency figure and coefficient of coherence, passing the corresponding value in place, letter amplitude frequency diagram hump greater than 0.8, represent that then the transport function numerical value that obtains is believable, otherwise explanation has noise as coefficient of coherence, need carry out the hammering experiment again.
(3) system can real part, the form of imaginary part preserves and pass the function certificate, clicks and passes function according to the output button, and the Data Filename that input is preserved can pass function according to saving as text formatting (.txt) form.
(4) after the analysis of biography letter finishes, enter the modal parameter recognition module.
The model analysis step is as follows:
(1) clicks the model analysis button at main interface, enter the model analysis interface
(2) select to pass function according to file, the numerical value of input initial frequency and termination frequency is determined the scope of analysis frequency, the biography function certificate of the displacement-power in the interface display frequency range, as shown in figure 16.
(3) according to passing letter figure input match exponent number, click mode match button, the interface shows that simultaneously actual measurement passes the biography letter figure of letter figure and match, and below the interface, showing biography function by match according to each the rank modal parameter that obtains by the array form, each row is respectively natural frequency, damping ratio, modal mass and modal stiffness.
When (4) selecting the match exponent number, be close to the master most with measured curve and matched curve.As satisfied to fitting result, can text file format preserve the modal parameter data, click and preserve data button, import file name is preserved data in data are preserved dialog box.
(5) after the mode match finishes, click return push-button, system turns back to main interface.
Noise testing and analysis module are mainly used in the accuracy of proof machine bed system flutter Calculation of Stability Region, voice signal in noise testing and the analysis module harvester bed system process, and time-domain signal obtained the frequency domain characteristic of system as fft analysis, judge the vibration situation in the machine tooling process.Need test in process with microphone near Working position during test.Test is as follows with analytical procedure:
(1) carry out acquisition parameter configuration, set acquisition time, click begin to gather button after system begin to gather sound, acquisition time finishes rear interface and shows time-domain signal and the amplitude frequency diagram of gathering, and in the fundamental frequency value of the lower left corner, interface shows signal.Click and preserve data button preservation data file.As shown in figure 18.
(2) audio files after the optional piecewise analysis of click interface top data readback button is preserved, the audio files that the selection of data file button will be analyzed is opened in click, the time period that in the time-domain signal interface, will analyze with two vertical lines selections of mouse drag, click selected frequency domain range button after selected, then show starting point and terminating point coordinate after selecting in the left side, interface; Click the spectrum analysis button, system carries out fft analysis to selected time period signal, and below, left side, interface shows the fundamental frequency value, and the below, right side shows spectrogram.As shown in figure 19.
Claims (2)
1, a kind of system for measuring and analyzing digital-controlled machine-tool dynamic characteristic is characterized in that: this system partly is made up of hardware platform and software systems two;
This hardware platform partly includes: cutting tool for CNC machine (1), power hammer (2), acceleration transducer (3), charge amplifier (4), data acquisition unit (7), microphone (12) and computing machine (11);
This acceleration transducer (3) adopts clay to be bonded at the end of cutting tool for CNC machine (1), this power hammer (2) links to each other with charge amplifier (4) by signal wire with acceleration transducer (3), charge amplifier (4) links to each other by cable with data acquisition unit (7), data acquisition unit (7) is realized data transmission with computing machine (11) by the usb data line, and the interface of the interface of microphone (12) and computing machine (11) sound card links to each other and responsible noise signal of gathering in the process;
These software systems partly include following module:
1. main interface provides the inlet that enters each functional module and main human-computer interaction interface;
2. data acquisition module: gather the data that sensor transmitted are distortionless, and the data of the gathering form according to tens digit is stored in the computing machine;
3. data readback module: read the data file of having stored, data are shown to the user with wave form or array form check, carry out later stage off-line statistical study;
4. hammering experiment module: machine tool system is carried out the hammering experiment, and collection power and response signal show time domain waveform, and time-domain signal is done fast Flourier (FFT) conversion, obtain frequency domain characteristic, and preserve the time-domain signal data;
5. pass the letter analysis module: hammering is tested the data rate of doing work analysis of spectrum that collects and asked average, calculate system transter and preservation, show amplitude frequency diagram, phase frequency figure, and calculate the reliability of coefficient of coherence judgement transport function;
6. modal parameter recognition module: system transter is carried out the mode match, on the basis of match, calculate modal parameters such as natural frequency, damping ratio, rigidity and preserve;
7. noise testing and analysis module: the voice signal of gathering in the lathe process is also made fft analysis, obtains the noise frequency domain characteristic, judges the vibration situation in the process.
2, a kind of system for measuring and analyzing digital-controlled machine-tool dynamic characteristic according to claim 1, it is characterized in that: the function of this each functional module of software systems is as follows:
1. human-computer interaction interface:
After system's operation, can at first call software startup arena face, occur man-machine interaction master interface then, select the required functional module of calling, click the corresponding functional modules button, will eject the front panel figure of corresponding functional modules; Its program circuit is: the value of at first initialization-next step execution software for display animation-next step execution inquiry state machine-whether accuse and equal zero, call data acquisition module if equal zero then to carry out; Otherwise whether inquiry equals 1, if equaling 1 execution calls the data readback module, otherwise whether inquiry equals 2, carries out the hammering experiment if then carry out; Otherwise whether inquiry equals 3, passes the letter analysis module if carry out to call; Otherwise whether inquiry equals 4, calls the modal parameter recognition module if carry out; Otherwise whether inquiry equals 5, calls noise testing and analysis module if carry out; Otherwise carrying out to withdraw from-Ruo do not withdraw from and then turns back to the value of carrying out the inquiry state machine, stop if withdrawing from then to carry out;
2. data acquisition module:
Left side at the acquisition parameter configuration interface of data acquisition module is the parameter of the required input of functional module: sample frequency, sampling number, buffer zone quantity, initial channel, total number of channels, ceiling voltage limit, minimum voltage limit; The user set just can enter that waveform shows behind the above-mentioned parameter and the data acquisition interface in begin to start capture program; The right side can not be modified for from the information that data acquisition unit read;
In demonstration of data acquisition module waveform and data storage interface, can view the current real system sample frequency input data acquisition date and the storing path of data file, click preservation data button just can be saved as data the data file in the computing machine, and the form of support is text * .txt and Excel file * .xls; Meanwhile in the array display interface, can check the real time data point that is stored in the calculator memory array, the program development flow process of data acquisition module is: at first initialization-next step execution is called dynamic link library (DLL) if if array shows and waveform shows if function-next step carry out to take out that buffer data-next step carries out that translation operation-next step carries out that data recombination-next step is carried out simultaneously-next step is carried out storage data-do not store data and return-store data then carry out next step and write data-next step execution and withdraw from-withdraw from then carry out and withdraw from module, otherwise inquires and whether press exit button;
3. data readback module:
The data readback module mainly is to carry out off-line ground for the data that former institute is gathered and preserves to analyze, the data file of having stored that selection need be called, click playback button, just can in the waveform display interface, see the waveform of data file, simultaneously in array shows with the two-dimensional table format video data, is data readback modular program development process is: at first the value of file path-execution query State machine-equal zero called in initialization-execution? equal zero and turn back to the value of query State machine, if read file-carry out display waveform simultaneously and array shows whether next step inquiry quits a program-then withdraw from otherwise carry out, otherwise to continue to inquire whether press " exit button ";
4. hammering experiment module:
In the hammering experiment module, need carry out the sampling parameter setting, comprise the channel number of setting analysis frequency, sampling number, number of taps, sampling trigger voltage, the channel number of gathering impulsive force, collection response, the calibration value of power and response, the filename of data storage file and path etc.; Two curve maps in right side show the impulsive force of being gathered and the time-domain signal of response, and are stored in the computing machine with document form; Hammering experiment module development process: if at first initialization-next step execution is provided with sampling parameter-next step wait knocked-whether next step inquiry would have force signal input-otherwise turn back to and wait for and knocking, if then carry out next step collection power and response signal-next step carry out simultaneously display waveform and storage data-inquire simultaneously number of taps wait for and knocking otherwise return to carry out whether greater than setting total degree-if then withdraw from module;
5. pass the letter analysis module:
In passing the letter analysis module, read in the signal file that the hammering experiment is gathered, and in interface (Figure 14), show experimental configuration information.Knock the force signal and the response signal that obtain to N time respectively and make fft analysis and power spectrumanalysis, utilize calculation formulae of frequency response function:
Obtain the frequency response function data of system, and utilize the calculating formula of coherence function:
Judge the test mass and the reliability of frequency response function; Passing letter analysis module development process is: at first initialization-next step execution opens that the image data file-next step is carried out, and to show that acquisition configuration parameter-next step carries out that FFT (fast fourier transform)-next step carries out that power spectrum conversion-next step carries out power spectrum average-next step carry out calculate frequency response function-next step carry out respectively simultaneously show amplitude frequency diagram, phase frequency figure, coefficient of coherence figure-next step is carried out and preserves frequency response function data;
6. modal parameter recognition module:
In the modal parameter recognition module, read in acceleration and pass function according to file, be converted into displacement pass function according to and in the interface, show, the frequency range and the match exponent number of input match, utilize the rational fraction orthogonal polynomial that it is carried out curve fitting, on the basis of curve fitting, obtain natural frequency, damping ratio, modal parameters such as rigidity, the model analysis flow process is: initialization-next step execution open pass function according to file-next step execution be converted to displacement pass function according to-next step determine the match frequency range-next step carry out determine that the match exponent number-next step is carried out curve fitting-next step carry out fitting result and show-next step inquiry whether to the result satisfied-dissatisfied then turn back to carry out determine the match frequency range, if satisfied then carry out next step and ask for that modal parameter-next step is carried out and preserves modal parameter data;
7. noise testing and analysis module:
In noise testing and the analysis module, at first carry out the sampling parameter setting, form, acquisition rate and acquisition time etc. are gathered in setting, and the software startup sound card begins to gather, and system reads in data and shows from buffer zone, and collection is closed sound card after finishing.The voice signal that collects is made fft analysis, obtain the amplitude versus frequency characte of signal and in interface display, noise testing and analysis process are: at first initialization-next step execution be provided with sampling parameter-next step carry out to start sound card-next step execution read buffer data-next step inquiry sampling whether finish-if then carry out and close sound card, read that buffer data-next step is carried out respectively simultaneously, and display waveform and storage data-next step is carried out and selects that signal time section-next step is carried out, and fft analysis-next step is carried out respectively simultaneously and shows the amplitude-frequency waveform otherwise turn back to, measure fundamental frequency.
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Cited By (38)
| Publication number | Priority date | Publication date | Assignee | Title |
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