CN110133098A - A kind of high precision measuring device and measurement method of land mine sound vibration characteristic - Google Patents
A kind of high precision measuring device and measurement method of land mine sound vibration characteristic Download PDFInfo
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- CN110133098A CN110133098A CN201910260421.0A CN201910260421A CN110133098A CN 110133098 A CN110133098 A CN 110133098A CN 201910260421 A CN201910260421 A CN 201910260421A CN 110133098 A CN110133098 A CN 110133098A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/36—Detecting the response signal, e.g. electronic circuits specially adapted therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
- G01N29/4418—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with a model, e.g. best-fit, regression analysis
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Abstract
The present invention is the high precision measuring device and measurement method of a kind of land mine sound vibration characteristic, including laser vibration measurer, impulsive force hammer, data collecting card, model analysis instrument, signal generator, sound console, balancer, power amplifier, loudspeaker, computer and land mine to be measured；Laser vibration measurer is sequentially connected model analysis instrument, data collecting card and computer by data line；Impulsive force hammer connects data collecting card by data line；Signal generator is sequentially connected sound console, balancer, power amplifier and loudspeaker by data line；Force signal is acquired by data collecting card；High-intensitive sound wave is emitted by loudspeaker；Response signal is acquired by laser vibration measurer；Collected time-domain signal is transformed to frequency-region signal in model analysis instrument and obtains the frequency response function of corresponding points；The frequency response function and each rank modal parameter of land mine model to be measured are obtained by data fitting and parameter identification method.The present invention realizes the high-precision of land mine sound vibration characteristic, easy-operating non-cpntact measurement.
Description
Technical field
The present invention relates to mine detection technical field, the high precision measuring device of especially a kind of land mine sound vibration characteristic and survey
Amount method is the measuring device and method of the mechanical vibration performance of land mine in the research of acoustic detection land mine.
Background technique
The safety of mine and effectively detection are a worldwide problems.Common low frequency metal detector base
In electromagnetic induction principle, the less nonmetallic mine of tenor can not be effectively detected in detection mechanism, reliability is low, and
Since it is sensitive to metal clips, there are false alarm rates it is higher, detection efficient is low the problems such as.It is other such as ground penetrating radar explorations, red
The imaging techniques such as outside line thermal imaging mine-detecting technique, X-ray mine-detecting technique, signal processing time is long, and recognition accuracy is poor, Wu Fayou
Effect differentiates the type of land mine, fragment, stone or other treasure troves；Some non-imaged technologies, such as neutron mine-detecting technique, nuclear power quadrupole
Square resonance mine-detecting technique identifies land mine by the nucleic reaction or nuclear resonance signal of explosive in detection land mine, has higher
Detectivity and speed of detection, but its system complex is expensive, and detection signal is weaker, and will receive the interference of electromagnetic field, distance
Practical stage, there are also certain distances.In addition, biological formula detecting a mine method (detect a mine careless and detect a mine luminous thin by such as detecting a mine honeybee, detecting a mine dog
Bacterium etc.) also in exploration and experimental stage, although the lower reliability of false alarm rate is poor.
Acoustic resonance mine-detecting technique based on land mine mechanical property illustrates good detection prospect, and wherein the sound and vibration of land mine is special
Property be measure land mine mechanical property an important feature.The geometric dimension of land mine and common buried depth, determine ground
The resonant frequency for the resonator system that buried soil above Lei Yuqi is constituted in low-frequency range, and what land mine was constituted with necromancer earth thereon
For resonator system in acoustic wave excitation and in the case where resonate, it is special that the vibration of the thunder body cover of land mine can show specific sound and vibration
Property, and influence the specific vibrational state of earth's surface.Therefore, it can be used for the embedded ground of sound wave identification by detecting the sound vibration characteristic of land mine
The research of thunder.
Lack commercial or dedicated land mine sound vibration characteristic measuring device, a typical land mine sound vibration characteristic measurement dress at present
Setting should include signal excitation system, land mine embedded device and contactless vibration signal detection system.Currently, emitting system in sound wave
There is commercial product in system face, but lacks and be applied in combination with land mine embedded device；There is dedicated set in terms of vibration signal detection system
It is standby, but structure is complicated, and not portable, light is not easy to calibrate, and measurement result precision is not high, and intuitive is poor, can not be to vibration
Object carries out effective non-contact detection.The present invention is exactly directed to what this key technology was unfolded.
Summary of the invention
It is an object of the invention to overcome the high precision measuring device etc. that there is no dedicated land mine sound vibration characteristic at present
The problem of, the high precision measuring device and measurement method for providing a kind of land mine sound vibration characteristic are, it can be achieved that thunder sound vibration characteristic over the ground
High-acruracy survey.
In order to achieve the above objectives, the present invention adopts the following technical solutions:
A kind of high precision measuring device of land mine sound vibration characteristic, including laser vibration measurer, impulsive force hammer, data collecting card,
Model analysis instrument, signal generator, sound console, balancer, power amplifier, loudspeaker, computer and land mine to be measured；It is described to swash
Flash ranging Vibration Meter is sequentially connected the model analysis instrument, the data collecting card and the computer by data line；The pulse
Power hammer connects the data collecting card by data line；The signal generator by data line be sequentially connected the sound console,
The balancer, the power amplifier and the loudspeaker.
Using above-mentioned measuring device, a kind of high-precision measuring method of land mine sound vibration characteristic is directed to non-mine, tool
Body implementation steps are as follows:
(1) sound of the land mine to be measured is established in the computer connecting with the model analysis instrument by data line
Shake model, carries out test point arrangement to the sound and vibration model of the land mine, the specific steps are as follows:
A) on the basis of the diameter of the land mine upper end to be measured disc, θ angle is rotated every time around the center of circle, wherein θ≤20 °,
Upper end disc is evenly dividing as 2 π/θ sector portion；
B) the upper end disc of the land mine to be measured is evenly dividing the circumference for being R/x for distance interval along radius R, wherein x
>=6, x are positive integer；
C) circumference for being H/y for distance interval is evenly dividing along height H in the side of the land mine to be measured, wherein y >=3, y
For positive integer；
D) to step a)-c) in divide the intersection point of the land mine to be measured and be successively numbered, and mark MmA mark point,
M=1,2,3 ... (2 π/θ) [(R/x)+(H/y) -1]+1；
E) the lower end disc of the land mine to be measured is bonded on rigid platfor with foamed glue level.
(2) centre bit of the Laser emission mouth of the adjustment laser vibration measurer and the upper end disc for being directed at the land mine to be measured
It sets a little, inspection center's location point is reflected back the laser signal of the laser vibration measurer；
(3) according to the distance between the laser emission point of the land mine center point and the laser vibration measurer to be measured,
The Focusing parameter of the laser vibration measurer and the model analysis instrument is adjusted, laser is kept to be in focusing state；
(4) mark point on the upper end disc and side of the land mine to be measured, position are successively motivated using impulsive force hammer
Twice in the excitation of the mark point of upper end disc and side intersection, the excitation of other each points is primary, the centre bit of the land mine to be measured
It sets a little excitation as a reference point and twice, motivates n times, N=(2 π/θ) [(R/x)+(H/y)]+1 altogether；
(5) the force signal F generated by data collecting card acquisition land mine to be measured as described in the pulse power hammer excitationi
(ω), i=1,2,3 ... N, and by force signal Fi(ω) data are transferred in the model analysis instrument and the computer, ω table
Show driving frequency range；
(6) the response signal X that the land mine to be measured generates is acquired by the laser vibration measureri(ω), i=1,2,3 ... N,
And by response signal Xi(ω) data are transferred in the model analysis instrument and the computer；
(7) in the model analysis instrument, through analog-to-digital conversion and Fast Fourier Transform (FFT) by the input power and output of acquisition
The time-domain signal of response is transformed to frequency-region signal and saves, and obtains after the model analysis instrument and the computer disposal described
The frequency response function h of each mark point of land mine to be measuredi(ω)=Xi(ω)/Fi(ω), i=1,2,3 ... N, then pass through data
The method of fitting obtains the frequency response function of the land mine sound and vibration model to be measured, and is demodulated by Parameter Identification described to be measured
The modal parameter of land mine；
(8) it is described to geodetic that the data demodulated in the model analysis instrument are handled in the computer, show and are recorded
Transmission function, modal frequency and the Mode Shape parameter of thunder in a vibrating mode.
Using above-mentioned measuring device, a kind of high-precision measuring method of land mine sound vibration characteristic is directed to mine, specifically
Implementation steps are as follows:
(I) land mine to be measured is embedded in sandy soil, make the sandy soil above the land mine to be measured be completely covered it is described to
The upper end disc of geodetic thunder；
(II) in sandy soil surface grid division, make the net region divided that burying for the land mine to be measured can be completely covered
If region, the intersection point number consecutively to grid is In, n=1,2,3 ... M (M >=50) are passing through data with the model analysis instrument
The grid model in the land mine region to be measured corresponding with number is established in the computer of line connection；
(III) the center point in land mine region to be measured described in the sounding port face by the loudspeaker；
(IV) it adjusts the Laser emission mouth of the laser vibration measurer and is aligned in the net region of the land mine to be measured and number
For 1 mesh point, the laser signal that the mesh point is reflected back the laser vibration measurer is detected；
(V) signal generator is issued frequency is f0The starting sine wave signal of Hz, is adjusted by the sound console
The size of acoustic pressure is high by issuing after the power amplifier amplifying power by the intensity of the balancer stabilization signal wave
Intensity sinusoidal sound wave；
(VI) keep the energy output power parameter setting of the signal generator and the loudspeaker constant, by the letter
The sinusoidal sound wave signal frequency that number generator issues increases 1Hz, i.e. the frequency of sending sine wave signal is (f0+ 1) Hz, using logical
The sequentially connected laser vibration measurer of data line, the model analysis instrument, the data collecting card and the computer is crossed to survey
Measure and record the vibration response signal for the test point that number is 1 in the land mine net region to be measured under frequency sound waves excitation；
(VII) operation for repeating step (VI), measuring and recording to predeterminated frequency is (f0+ N) Hz when the land mine to be measured
The vibration response signal for the point that number is 1 in net region；
(VIII) take with the identical operation of step (IV)-(VII), measured and recorded in the computer number be 2 net
The vibration response signal of lattice point；
(Ⅸ) operation of step (VIII) is repeated, being measured and recorded in the computer to number is IMMesh point vibration
Sound of something astir induction signal；
(Ⅹ) in the computer, using CATS Mdoal analysis software and the mesh point that number is 1~M is obtained
It is f in frequency0~(f0+ N) corresponding vibratory response amplitude curve under Hz, the minefield to be measured is obtained by curve-fitting method
The mode in domain indicates transmission function, by corresponding to the vibration amplitude of mesh point under demodulation different frequency, draws in the computer
The mode of oscillation for producing grid model demodulates the modal parameter in the land mine region to be measured after software is handled.
Compared with prior art, the present invention has the advantages that following substantive distinguishing features outstanding and significant:
Laser vibration measurer in apparatus of the present invention is based on laser self-mixing translation principle of interference, overcomes conventional interference measurement experiment
The device is complicated, system is huge, light beam is not easy the disadvantages of collimating, is not portable, can carry out to coarse divergence surface accurate
Non-contacting vibration signal measurement, and the data demodulated in model analysis instrument can be grasped in computer terminal 3D animation and visualization display
Make more intuitive, simpler.
Detailed description of the invention
Fig. 1 is the high precision measuring device structural schematic diagram of land mine sound vibration characteristic of the invention；
Fig. 2 is the surface test point arrangement schematic diagram of land mine；
Fig. 3 is the high-precision measuring method implementation steps block diagram of land mine sound vibration characteristic；
Fig. 4 is mine net region test point arrangement schematic diagram；
Fig. 5 is the high-precision measuring method implementation steps block diagram of mine sound vibration characteristic.
Specific embodiment
The preferred embodiment of the present invention combination attached drawing is discussed below:
Referring to Fig. 1, a kind of high precision measuring device of land mine sound vibration characteristic, including laser vibration measurer 101, impulsive force hammer
102, data collecting card 103, model analysis instrument 104, signal generator 112, sound console 113, balancer 114, power amplifier
115, loudspeaker 116, computer 105, do not bury land mine 106 to be measured and bury land mine 119 to be measured；The laser vibration measurer 101
The model analysis instrument 104, the data collecting card 103 and the computer 105 are sequentially connected by data line；The pulse
Power hammer 102 connects the data collecting card 103 by data line；The signal generator 112 is sequentially connected institute by data line
State sound console 113, the balancer 114, the power amplifier 115 and the loudspeaker 116.
The laser vibration measurer and model analysis instrument used in the present embodiment use the VSM1000L- of Julight company production
EXT-SCAN system module, 086 series of pulses power hammer of the impulsive force hammer using the production of U.S. PCB Piezo Lab Co., Ltd., data collecting card
The NI-PXI multi-channel data acquisition board produced using American National instrument (NI) Co., Ltd, signal generator select Tyke section
AFG3022C type random waveform/function generator of skill (Tektronix) Co., Ltd production, loudspeaker select sound king
(SoundKing) the high-power speaker of JB215 of Co., Ltd's production, sound console select the production of Yamaha (Yamaha) company
Mg8/2fx professional audio sound console, balancer select the Q2031B series balance device of Yamaha (Yamaha) company production, power
Amplifier selects the PA bank of power amplifier of Dongguan Dong Ya sound equipment Co., Ltd production.
As shown in figure 3, a kind of high-precision measuring method of land mine sound vibration characteristic is directed to not using above-mentioned measuring device
Mine, this method specific implementation step are as follows:
(1) it is not buried described in being established in the computer 105 being connect with the model analysis instrument 104 by data line
The sound and vibration model of land mine 106 to be measured carries out test point arrangement to the sound and vibration model for not burying land mine 106 to be measured, such as Fig. 2 institute
Show, the specific steps are as follows:
A) on the basis of the diameter for not burying 106 upper end disc 109 of land mine to be measured, θ angle is rotated every time around the center of circle,
Upper end disc 109 is evenly dividing as 2 π/θ sector portion by wherein θ≤20 °；
B) being evenly dividing the upper end disc 109 for not burying land mine 106 to be measured for distance interval along radius R is R/x
Circumference, wherein x >=6, x are positive integer；
C) circle for being H/y for distance interval is evenly dividing along height H in the side 108 for not burying land mine 106 to be measured
In week, wherein y >=3, y are positive integer；
D) to step a)-c) in divide the intersection point for not burying land mine 106 to be measured and be successively numbered, and mark Mm
A mark point, m=1,2,3 ... (2 π/θ) [(R/x)+(H/y) -1]+1；
E) the lower end disc 110 for not burying land mine 106 to be measured is bonded in rigid platfor 111 with foamed glue level
On.
(2) it adjusts the Laser emission mouth of the laser vibration measurer 101 and is directed at the upper end for not burying land mine 106 to be measured
The center point 107 of disc 109, inspection center's location point 107 are reflected back the laser signal of the laser vibration measurer 101；
(3) it is sent out according to the laser for not burying 106 center point 107 of land mine to be measured and the laser vibration measurer 101
The distance between exit point adjusts the Focusing parameter of the laser vibration measurer 101 and the model analysis instrument 104, keeps at laser
In focusing state；
(4) upper end disc 109 and the side for not burying land mine 106 to be measured described in impulsive force hammer 102 successively excitation are utilized
Mark point on face 108 motivates twice positioned at the mark point of 108 intersection of upper end disc 109 and side, other each points excitation one
Secondary, the excitation as a reference point of center point 107 for not burying land mine 106 to be measured twice, motivates n times, N=(2 π/θ) altogether
[(R/x)+(H/y)]+1；
(5) land mine to be measured is not buried by 102 excitation of impulsive force hammer is described by the data collecting card 103 acquisition
The 106 force signal F generatedi(ω), i=1,2,3 ... N, and by force signal Fi(ω) data are transferred to the model analysis instrument 104
In the computer 105, ω indicates driving frequency range；
(6) the response signal X for not burying land mine 106 to be measured and generating is acquired by the laser vibration measurer 101i(ω), i
=1,2,3 ... N, and by response signal Xi(ω) data are transferred in the model analysis instrument 104 and the computer 105；
(7) in the model analysis instrument 104, through analog-to-digital conversion and Fast Fourier Transform (FFT) by the input power of acquisition with it is defeated
The time-domain signal responded out is transformed to frequency-region signal and saves, after the model analysis instrument 104 and the computer 105 are handled
Obtain the frequency response function h of each mark point for not burying land mine 106 to be measuredi(ω)=Xi(ω)/Fi(ω), i=1,
2,3 ... N, then the frequency response function for not burying 106 sound and vibration model of land mine to be measured is obtained by the method that data are fitted, and
The modal parameter for not burying land mine 106 to be measured is demodulated by Parameter Identification；
(8) it is described that the data demodulated in the model analysis instrument 104 are handled in the computer 105, show and are recorded
Transmission function, modal frequency and the Mode Shape parameter of land mine 106 to be measured in a vibrating mode are not buried.
That uses in the present embodiment does not bury 106 sample of land mine to be measured using the antitank plastics practice mine of 69 formulas.Referring to
Fig. 2 carries out test point arrangement, Zhi Houyong to the upper end disc 109 for not burying land mine 106 to be measured and side 108 in the present embodiment
Impulsive force hammer 102 is motivated, and acquires the force signal and response signal of generation.
Referring to Fig. 1 and Fig. 5, a kind of high-precision measuring method of land mine sound vibration characteristic is directed to using above-mentioned measuring device
Mine, specific implementation step are as follows:
(I) it buries land mine 119 to be measured by described and is embedded in sandy soil 118, make the sand for burying 119 top of land mine to be measured
The upper end disc 120 for burying land mine 119 to be measured is completely covered in soil；
(II) as shown in figure 4, in the 118 surface grid division of sandy soil, make the net region divided that institute can be completely covered
The embedded region for burying land mine 119 to be measured is stated, the intersection point number consecutively to grid is In, n=1,2,3 ... M (M >=50), with
The land mine to be measured corresponding with number is established in the computer 105 that the model analysis instrument 104 is connected by data line
The grid model in 106 regions；
(III) the center point in 119 region of land mine to be measured is buried described in the sounding port face by the loudspeaker 116
117；
(IV) it adjusts the Laser emission mouth of the laser vibration measurer 101 and is directed at the grid for burying land mine 119 to be measured
The mesh point that number is 1 in region, detects the laser signal that the mesh point is reflected back the laser vibration measurer 101；
(V) signal generator 112 is issued frequency is f0The starting sine wave signal of Hz, passes through the sound console
113 adjust the size of acoustic pressure, by the intensity of the 114 stabilization signal wave of balancer, are amplified by the power amplifier 115
High-intensitive sinusoidal sound wave is issued after power；
(VI) keep the energy output power parameter setting of the signal generator 112 and the loudspeaker 116 constant, it will
The sinusoidal sound wave signal frequency that the signal generator 112 issues increases 1Hz, i.e. the frequency of sending sine wave signal is (f0+1)
Hz, using pass through the sequentially connected laser vibration measurer 101 of data line, the model analysis instrument 104, the data collecting card
103 and the computer 105 measure and record the frequency sound waves excitation under described bury numbered in 119 net region of land mine to be measured
For the vibration response signal of 1 test point；
(VII) operation for repeating step (VI), measuring and recording to predeterminated frequency is (f0+ N) Hz when it is described bury it is to be measured
The vibration response signal for the point that number is 1 in 119 net region of land mine；
(VIII) take with the identical operation of step (IV)-(VII), measuring and recording number in the computer 105 is 2
Mesh point vibration response signal；
(Ⅸ) operation of step (VIII) is repeated, measuring and recording in the computer 105 to number is IMMesh point
Vibration response signal；
(Ⅹ) in the computer 105, using CATS Mdoal analysis software and the net that number is 1~M is obtained
Lattice point is f in frequency0~(f0+ N) corresponding vibratory response amplitude curve under Hz, by curve-fitting method obtain it is described it is embedded to
The mode in 119 region of geodetic thunder indicates transmission function, by corresponding to the vibration amplitude of mesh point under demodulation different frequency, described
The mode of oscillation that grid model is drawn out in computer 105 demodulates the mould in 119 region of land mine to be measured after software is handled
State parameter.
That uses in the present embodiment buries 119 sample of land mine to be measured using the antitank plastics practice mine of 69 formulas.Referring to figure
4, grid dividing is carried out to the sandy soil for burying 119 upper area of land mine to be measured in the present embodiment, later according to grid mark shown in Fig. 4
The sequence of note point successively measures and records the vibration response signal of the point, analyzed by computer 105 and demodulate bury it is to be measured
The sound vibration characteristic parameter of land mine 119.
Claims (4)
1. a kind of high precision measuring device of land mine sound vibration characteristic, which is characterized in that including laser vibration measurer (101), impulsive force
Hammer (102), data collecting card (103), model analysis instrument (104), signal generator (112), sound console (113), balancer into shape
(114), power amplifier (115), loudspeaker (116), computer (105), do not bury land mine to be measured (106) and embedded to geodetic
Thunder (119)；The laser vibration measurer (101) is sequentially connected the model analysis instrument (104) by data line, the data acquire
Block (103) and the computer (105), the impulsive force hammer (102) connects the data collecting card (103) by data line；
The signal generator (112) is sequentially connected the sound console (113), the balancer (114), the power by data line
Amplifier (115) and the loudspeaker (116).
2. a kind of high-precision measuring method of land mine sound vibration characteristic is directed to and is not buried using measuring device described in claim 1
Land mine, which is characterized in that specific implementation step are as follows:
(1) it is not buried described in being established in the computer (105) being connect with the model analysis instrument (104) by data line
The sound and vibration model of land mine (106) to be measured, and test point arrangement is carried out to sound and vibration model；
(2) it adjusts the Laser emission mouth of the laser vibration measurer (101) and is directed at the upper end for not burying land mine to be measured (106)
The center point (107) of disc (109), inspection center's location point (107) are reflected back the laser of the laser vibration measurer (101)
Signal；
(3) according to the laser for not burying land mine to be measured (106) center point (107) Yu the laser vibration measurer (101)
The distance between launch point adjusts the Focusing parameter of the laser vibration measurer (101) and the model analysis instrument (104), keeps
Laser is in focusing state；
(4) using impulsive force hammer (102) successively the excitation upper end disc (109) for not burying land mine to be measured (106) and
Mark point on side (108), the mark point for being located at upper end disc (109) and side (108) intersection motivate twice, other are each
Point excitation is primary, and center point (107) excitation as a reference point for not burying land mine to be measured (106) twice, motivates N altogether
It is secondary, N=(2 π/θ) [(R/x)+(H/y)]+1；
(5) land mine to be measured is not buried by impulsive force hammer (102) excitation is described by the data collecting card (103) acquisition
(106) the force signal F generatedi(ω), i=1,2,3 ... N, and by force signal Fi(ω) data are transferred to the model analysis instrument
(104) and in the computer (105), ω indicates driving frequency range；
(6) by the laser vibration measurer (101) acquisition response signal X for not burying land mine to be measured (106) generationi(ω), i
=1,2,3 ... N, and by response signal Xi(ω) data are transferred to the model analysis instrument (104) and the computer (105)
In；
(7) in the model analysis instrument (104), through analog-to-digital conversion and Fast Fourier Transform (FFT) by the input power and output of acquisition
The time-domain signal of response is transformed to frequency-region signal and saves, and handles through the model analysis instrument (104) and the computer (105)
The frequency response function h of each mark point for not burying land mine to be measured (106) is obtained afterwardsi(ω)=Xi(ω)/Fi(ω), i
=1,2,3 ... N, then the frequency response for not burying land mine to be measured (106) sound and vibration model is obtained by the method that data are fitted
Function, and the modal parameter for not burying land mine to be measured (106) is demodulated by Parameter Identification；
(8) data demodulated in the processing model analysis instrument (104) in the computer (105) show and record described
Transmission function, modal frequency and the Mode Shape parameter of land mine to be measured (106) in a vibrating mode are not buried.
3. the high-precision measuring method of land mine sound vibration characteristic according to claim 2, which is characterized in that the step (1)
In to do not bury land mine to be measured (106) sound and vibration model carry out test point arrangement, the specific steps are as follows:
A) on the basis of the diameter for not burying land mine to be measured (106) upper end disc (109), θ angle is rotated every time around the center of circle,
Upper end disc (109) is evenly dividing as 2 π/θ sector portion by wherein θ≤20 °；
B) being evenly dividing the upper end disc (109) for not burying land mine to be measured (106) for distance interval along radius R is R/x
Circumference, wherein x >=6, x are positive integer；
C) circle for being H/y for distance interval is evenly dividing along height H in the side (108) for not burying land mine to be measured (106)
In week, wherein y >=3, y are positive integer；
D) to step a)-c) in divide the intersection point for not burying land mine to be measured (106) and be successively numbered, and mark MmIt is a
Mark point, m=1,2,3 ... (2 π/θ) [(R/x)+(H/y) -1]+1；
E) the lower end disc (110) for not burying land mine to be measured (106) is bonded in rigid platfor (111) with foamed glue level
On.
4. a kind of high-precision measuring method of land mine sound vibration characteristic is directed to embedded ground using measuring device described in claim 1
Thunder, which is characterized in that specific implementation step are as follows:
(I) land mine to be measured (119) of burying is embedded in sandy soil (118), makes described bury above land mine to be measured (119)
The upper end disc (120) for burying land mine to be measured (119) is completely covered in sandy soil；
(II) in the sandy soil (118) surface grid division, the net region divided is completely covered and described buries land mine to be measured
(119) embedded region, the intersection point number consecutively to grid are In, n=1,2,3 ... M, wherein M >=50, divide with the mode
It is established in the computer (105) that analyzer (104) is connected by data line and corresponding with number described buries land mine to be measured
(119) grid model in region；
(III) the center point in land mine to be measured (119) region is buried described in the sounding port face by the loudspeaker (116)
(117)；
(IV) it adjusts the Laser emission mouth of the laser vibration measurer (101) and is directed at the grid for burying land mine to be measured (119)
The mesh point that number is 1 in region, detects the laser signal that the mesh point is reflected back the laser vibration measurer (101)；
(V) signal generator (112) are issued frequency is f0The starting sine wave signal of Hz, passes through the sound console
(113) size for adjusting acoustic pressure passes through the power amplifier by the intensity of the balancer (114) stabilization signal wave
(115) high-intensitive sinusoidal sound wave is issued after amplifying power；
(VI) keep the energy output power parameter setting of the signal generator (112) and the loudspeaker (116) constant, it will
The sinusoidal sound wave signal frequency that the signal generator (112) issues increases 1Hz, i.e. the frequency of sending sine wave signal is (f0+
1) Hz, using pass through the sequentially connected laser vibration measurer (101) of data line, the model analysis instrument (104), the data
Capture card (103) and the computer (105) measure and record and described bury land mine to be measured (119) net under frequency sound waves excitation
The vibration response signal for the test point that number is 1 in lattice region；
(VII) operation for repeating step (VI), measuring and recording to predeterminated frequency is (f0+ N) Hz when described bury land mine to be measured
(119) vibration response signal for the point that number is 1 in net region；
(VIII) take with the identical operation of step (IV)-(VII), measured and recorded in the computer (105) number be 2
The vibration response signal of mesh point；
(Ⅸ) operation of step (VIII) is repeated, measuring and recording in the computer (105) to number is IMMesh point vibration
Sound of something astir induction signal；
(Ⅹ) in the computer (105), using CATS Mdoal analysis software and the grid that number is 1~M is obtained
Point is f in frequency0~(f0+ N) corresponding vibratory response amplitude curve under Hz, it is obtained by curve-fitting method described embedded to geodetic
The mode in thunder (119) region indicates transmission function, by corresponding to the vibration amplitude of mesh point under demodulation different frequency, in the meter
The mode of oscillation that grid model is drawn out in calculation machine (105) demodulates after software is handled and described buries land mine to be measured (119) area
The modal parameter in domain.
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