CN1158540C - Controllable seismic source system for electromagnetic high-power shallow earthquake - Google Patents
Controllable seismic source system for electromagnetic high-power shallow earthquake Download PDFInfo
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- CN1158540C CN1158540C CNB011281472A CN01128147A CN1158540C CN 1158540 C CN1158540 C CN 1158540C CN B011281472 A CNB011281472 A CN B011281472A CN 01128147 A CN01128147 A CN 01128147A CN 1158540 C CN1158540 C CN 1158540C
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Abstract
The present invention discloses a controlled source system for electromagnetic high-power shallow earthquakes. The present invention is composed of two parts which are a main control machine case and an oscillation exciting body, wherein an industrial control PC makes a DDS generate pulse signals in the main control machine case to trigger a counter and a waveform memory to release digital waveforms, the digital waveforms are sent into a power amplifier driving oscillation exciter to generate oscillation which is transferred into the ground after the digital to analogue conversion and the wave filtering, oscillation signals are picked up by a sensor and compared with preset waveforms in the industrial control PC, and a close loop control circuit is also formed; the oscillation exciter uses the electromagnetic driving principle and adopts a counterweight reversed structure to realize the control of the optimum transmission of the seismic source energy to the earth. The present invention has the advantages of safety, repeatability of signals, etc. which exist in a hydraulic controlled source, the present invention enlarges the signal swept frequency range of 5Hz to 1400Hz by changing the driving means, and the requirements of shallow high-resolution seismic exploration can be met completely; the present invention thoroughly considers the field actual work environment, and meets the requirements of portable field construction and practicality through the optimization design of the system structure.
Description
Technical field:
The present invention relates to a kind of controlled non-explosive source, say it is a kind of controllable seismic source system for electromagnetic high-power shallow earthquake clearly, belong to the focus generating means technical field that seismic prospecting is used.
Background technology:
Vibroseis is to be a kind of non-explosive source that purpose grows up with the defective that overcomes explosive source.Abroad from the nineteen fifty-two hydraulic-driven vehicular vibroseis that begins one's study, its signal frequency sweep limit is at 6～180Hz, and maximum power output is tens KN.Development through decades is perfect, and present hydraulically powered vibroseis has become the main focus of external petroleum exploration domain, and utilization rate is up to more than 70%.But the system scan frequency that causes owing to its type of drive is low and reason such as field work heaviness, more and more is difficult to be applicable to the requirement of shallow-layer high resolution seismic exploration.
Summary of the invention:
The present invention discloses a kind of controllable seismic source system for electromagnetic high-power shallow earthquake, has solved problems such as the low and field work heaviness of system scan frequency that existing vibroseis type of drive causes.
Technical solution of the present invention: controllable seismic source system for electromagnetic high-power shallow earthquake is made up of the master control cabinet and the body two parts that impulse.Wherein, functions such as the quality monitoring of the generation of mutual, the sweep signal of master control cabinet responsible official machine and amplification, vibration signal and control; Vibration exciter realizes that electric energy is to mechanical transformation of energy.
The Bus Interface Unit of industry control PC makes DDS produce pulse signal in the master control cabinet, flip-flop number makes wave memorizer discharge digital waveform, through digital-to-analog conversion and filter filtering, send into pre-amplifier and drive the moving-coil generation vibrations of sending into vibration exciter through power amplifier, vibration signal imports into underground by substrate, the predetermined waveform that is picked up in vibration signal and the PC by sensor compares, and forms close loop control circuit;
Vibration exciter utilizes the Electromagnetic Drive principle, adopts counterweight inverted structure, realizes the best transmission of vibroseis energy to the earth; The body that impulses partly is made up of moving-coil, iron core, magnet steel, magnetic pole plate, counterweight, substrate and outer cover etc., wherein, moving coil framework top directly links to each other with the vibrator bearing bar, moving-coil is in the working gas gap between iron core and the magnetic pole plate, moving-coil constitutes the movable member of vibrator by two groups of spring supports that impulse; Spring one end that impulses is fixed on the counterweight, and substrate links to each other with the magnetic pole plate that produces permanent magnetic field, when electromagnetic field promotes the moving-coil vertical tremor, also can produce a reacting force to substrate and make its continuous " push-and-pull " elastic ground, promptly produces seismic event.
When power amplifier is supplied with moving-coil variable frequency electric current,, can obtain according to the law of electromagnetic induction:
F＝0.102BLI×10
-4 (1)
F
0＝0.102BLI
0×10
-4 (2)
In the formula: F is electromagnetic induction power (newton), promptly common so-called exciting force;
F0 is the amplitude (newton) of exciting force F, promptly so-called maximum exciting force;
B is an average magnetic induction density (Gauss) in the working gas gap;
I is the current instantaneous value (ampere) that power amplifier is supplied with;
I
0Amplitude (ampere) for electric current I;
L is the effective length (rice) of lead of the coil of cutting magnetic line.
Can obtain by (1), (2)
α＝F/I＝F
0/I
0＝0.102BL×10
-4 (3)
For vibrator, B, L are constant, so α is definite value, claim that usually α is the force constant of vibrator.
Good effect of the present invention is: design has been finished Electromagnetic Drive and has been supported the high frequency earthquake controllable earthquake focus system of random waveform scanning, not only have the safety that the hydraulic pressure vibroseis had, the advantages such as repeatability of signal, and by change to its type of drive, promoted the swept frequency range of signal, reach 5～1400Hz, can satisfy the demand of shallow-layer high-resolution seismic survey fully.And take into full account open-air actual working environment, by optimal design, reached the requirement of field construction lighting, practicability to system architecture.
Description of drawings:
Fig. 1 is a structural principle block diagram of the present invention.
Fig. 2 is a signal generation card signal amplitude regulating circuit schematic diagram.
1～handling drop handle; 2～outer cover; 3～counterweight housing; 4～spring impulses; 5～load bearing spring; 6～moving-coil; 7～magnet steel; 8～magnetic pole plate; 9～counterweight; 10～bearing bar; 11～iron core; 12～substrate; 13～crystal oscillator clock; 14～DDS; 15～trigger; 16～counter; 17～EEPROM; 18～D/A switch; 19～signal filtering; 20～signal amplitude is regulated; 21～prime is amplified; 22～power amplifier drives; 23～power amplification output; the indication of 24～state; 25～steering logic; 26～overcurrent-overvoltage overheat protector; 27～vibration transducer; the adjustment of 28～signal; 29～data acquisition; 30～phase-detection; 31～PC-EISA Bus Interface Unit; 32～control algolithm; 33～PC; 34～synchronous triggering unit; 35～keyboard; 36～liquid crystal display; 37～DAC0808.
Embodiment:
With reference to accompanying drawing 1, the master control cabinet mainly comprise servo-drive system 3., signal take place card 1., the power amplification parts 2., servo-drive system 3. in, the signal bus that has the industry control PC, 1. by control signal card takes place, when realizing sweep waveform output, it also is responsible for according to the system works environment of current setting and carries out phase place by the signal that feeds back from vibration exciter substrate 4. and control in real time, and differing of substrate 12 signals and drive signal is controlled in the certain limit; And, provide effective synchronous triggering agreement to the seismic event observation instrument by system synchronization trigger element 34; Realize man-machine interaction by keyboard 35, liquid crystal display 36.
1. card takes place signal is made up of crystal oscillator clock 13, DDS AD7008 14, D/A 18 and traffic filter 19 etc., can export the optional signal of random waveform, wider frequency range and amplitude by this card, is respectively applied for different seismic prospecting occasions.
Power amplifier is partly realized the sweep signal that signal takes place to block is amplified, to reach the enough driving forces to vibration exciter.
Because above DDS technology can only be exported the signal of single amplitude, is difficult to satisfy the actual scanning requirements of one's work, therefore the output terminal at DDS has designed signal amplitude regulating circuit (seeing shown in Figure 2) again.The digital signal of DDS AD7008 is through after the digital-to-analog conversion 18 of DAC0832 like this, by 8 DAC0808 37 its amplitude is regulated again, the voltage signal that makes its output provides quiescent point for the output of DAC0832 digital-to-analog conversion 18, thereby the amplitude that makes card output takes place signal signal can carry out 256 grades is accurately controlled.
The vibroseis power amplification circuit is exported 23 3 parts by preceding utmost point amplification 21, power amplifier driving 22 and power amplification and is formed.Requirements such as system is big dynamically in order to satisfy, low distortion rate and high conversion rate, its driving stage and output stage all adopt discrete component.
Pre-amplifier 21 constitutes 2 to 3 grades of amplifying circuits by three μ A741 to be realized, wherein a slice is switched by switch as reverser, realizes the requirement that input and output signal half-wave differ.Power amplifier drives 22 and forms complementary common-base amplification circuit by two triodes.Power amplifier output 23 is made of the class AB power amplifier of symmetry 26 triodes.Adopt overcurrent, overvoltage, thermal-shutdown circuit 26 to guarantee the safe and reliable work of whole power amplifier.
The electromagnetism of the high frequency body that impulses is a kind of electric device that converts electrical energy into mechanical energy, and it is the final embodiment of vibroseis design philosophy.Therefore, the impulse performance of body directly affects the quality of vibroseis sweep signal.Owing to used high magnetic energy material neodymium iron boron (Nd-Fe-B), this electromagnetic actuator has that thrust-weight ratio is big, volume is little, exciting force is to the characteristics such as non-linear little and response frequency height of power supply.The body that impulses is partly formed (seeing shown in Figure 1) by moving-coil 6, iron core 11, magnet steel 7, magnetic pole plate 8, counterweight 9, substrate 12 and outer cover 2 etc.Wherein moving-coil 6 skeleton tops directly link to each other with vibrator bearing bar 10, and moving-coil 6 is in the working gas gap between iron core 11 and the magnetic pole plate 8, and moving-coil 6 is supported by two groups of springs, constitutes the movable member of vibrator.Spring itself is fixed on the counterweight 9, when power amplifier is supplied with moving-coil variable frequency electric current,, around moving-coil, just can produce corresponding alternating magnetic field by the law of electromagnetic induction, this magnetic field and constant magnetic pole plate magnetic field interaction impel moving-coil to drive housing by given signal vibrations.
Claims (1)
1, a kind of controllable seismic source system for electromagnetic high-power shallow earthquake is made up of the master control cabinet and the body two parts that impulse, and it is characterized in that:
The Bus Interface Unit (31) of industry control PC (33) and crystal oscillator synchronous clock (13) make DDS (14) produce pulse signal in the master control cabinet, make random waveform storer (17) discharge waveform by trigger (15) flip-flop number (16), through digital-to-analog conversion (18) and wave filter (19) filtering, the sweep signal that produces is sent into pre-amplifier (21), this signal amplitude is controlled by amplitude regulator (20), the adjusted signal of pre-amplifier (21) drives moving-coil (6) the generation vibrations that (22) send into vibration exciter through power amplifier, vibration signal imports into underground by substrate (12), the vibration signal that is picked up by sensor (27) carries out digitizing through signal adjustment unit (28) and data collecting card (29), predetermined waveform in this signal and the PC (33) is compared by phase detection unit (30), it is differed under the intervention of predetermined control algorithm (32), form the phase control loop of total system, power amplifier output stage (23) and vibration exciter duty 4. in the system are monitored by protective device (26), unusually take safeguard measure by control logic circuit (25) for what occur, the relevant work state is embodied by state indication (24), keyboard (35) and liquid crystal display (36) are used for human-computer interaction function, and synchronous triggering unit (34) realize the time synchronized function of earthquake controllable earthquake focus system and other external equipment;
The body that impulses adopts counterweight inverted structure, impulse body by moving-coil (6), iron core (11), magnet steel (7), magnetic pole plate (8), counterweight (9), part such as substrate (12) and outer cover (2) is formed, wherein, moving-coil (6) skeleton top directly links to each other with vibration exciter bearing bar (10), moving-coil (6) is in the working gas gap between iron core (11) and the magnetic pole plate (8), moving-coil (6) is supported by two groups of springs that impulse (4), constitute the movable member of vibration exciter, spring (4) one ends that impulse are fixed on the counterweight (9), substrate (12) links to each other with the magnetic pole plate (8) that produces permanent magnetic field, when electromagnetic field promotes moving-coil (6) vertical tremor, also can produce a reacting force and make its continuous " push-and-pull " ground, promptly produce seismic event substrate (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011281472A CN1158540C (en) | 2001-09-05 | 2001-09-05 | Controllable seismic source system for electromagnetic high-power shallow earthquake |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011281472A CN1158540C (en) | 2001-09-05 | 2001-09-05 | Controllable seismic source system for electromagnetic high-power shallow earthquake |
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| CN1343891A CN1343891A (en) | 2002-04-10 |
| CN1158540C true CN1158540C (en) | 2004-07-21 |
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| CNB011281472A Expired - Fee Related CN1158540C (en) | 2001-09-05 | 2001-09-05 | Controllable seismic source system for electromagnetic high-power shallow earthquake |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323874A (en) * | 2013-06-28 | 2013-09-25 | 吉林大学 | Vibroseis phase-locked control system |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102288990B (en) * | 2011-08-03 | 2012-12-19 | 浙江大学 | Ultra-shallow three-dimensional seismic reflection wave exploration method |
| CN102749873B (en) * | 2012-07-27 | 2014-09-03 | 吉林大学 | Electromagnetic drive type phased source phase compensation control system and compensation control method |
| CN110261889A (en) * | 2019-06-17 | 2019-09-20 | 中国铁建重工集团股份有限公司 | A kind of PLC technology focus |
| CN110187380A (en) * | 2019-06-17 | 2019-08-30 | 中国铁建重工集团股份有限公司 | A kind of variable ratio frequency changer hydraulic shock focus |
| CN112505747B (en) * | 2020-12-22 | 2021-10-01 | 吉林大学 | System and method for suppressing vibration distortion based on cooperation of multi-signal generator and controllable seismic source |
| CN112946748A (en) * | 2021-02-01 | 2021-06-11 | 南方科技大学 | Underwater controllable seismic source generating device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323874A (en) * | 2013-06-28 | 2013-09-25 | 吉林大学 | Vibroseis phase-locked control system |
| CN103323874B (en) * | 2013-06-28 | 2015-09-23 | 吉林大学 | The phase-locked control system of vibroseis |
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| CN1343891A (en) | 2002-04-10 |
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