CN105865274B - Resonance or subresonance destroy method - Google Patents
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/20—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser
- A61B18/22—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser the beam being directed along or through a flexible conduit, e.g. an optical fibre; Couplings or hand-pieces therefor
- A61B18/26—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using laser the beam being directed along or through a flexible conduit, e.g. an optical fibre; Couplings or hand-pieces therefor for producing a shock wave, e.g. laser lithotripsy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/18—Use of auxiliary physical effects, e.g. ultrasonics, irradiation, for disintegrating
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/06—Particular applications of blasting techniques for seismic purposes
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Abstract
Present invention firstly provides a kind of resonance or subresonance to destroy method, it is to achieve the purpose that object on the intersection point of its direction of propagation line of destruction using the same or similar load stress wave resonance of two or more frequencies or subresonance including successively using frequency conversion load stress wave and determine frequency load stress wave for destroying object or the method.The present invention also provides a kind of method for releasing resonance, the method is to provide third road stress wave for releasing the resonance state having occurred and that between existing two-way stress wave, and the frequency of the third road stress wave provided is not equal to the frequency of existing two-way stress wave.The present invention makes full use of the resonance generated between stress wave and subresonance state, realizes that resonance destroys and release the purpose of resonance respectively.
Description
Technical field
The present invention relates to structural mechanics fields, and in particular to it is a kind of resonance or subresonance destroy method, a kind of subresonance
The method of multiplexing dynamic force and a kind of method for releasing resonance.
Background technique
Stress wave is the mode of propagation of stress and strain disturbance.For example, work as explosive explosion time in native rock medium, impact
Pressure, to propagating outside four, is exactly a kind of stress wave with wave.When stress and strain is in a linear relationship, Propagation
It is elastic wave；It is plastic wave and shock wave when in non-linear relation.Sound wave and ultrasonic wave etc. in seismic wave, solid are all normal
The stress wave seen.Various practical problems under the conditions of the dynamic loadings such as the same earthquake of research, explosion and the high velocity impact of stress wave are close
It is related.In the late three decades, the research of stress wave is rapidly developed, and in earthquake, engineering explosion, explosive processing and explosion are closed
At ultrasonic wave and acoustic emission, the impact strength of mechanical equipment, the dynamic response of engineering structure and building, bullet is to plate armour
Shock penetration, micrometeroroid and sleet Sorbet to the high-speed impact and the earth of aircraft, the crater of the moon and geology knot
The research of " impact denaturation ", the research of material dynamic mechanical and constitutive relation under high strain-rate, breaking kinetics in structure
Research, the research of Mechanical Properties of Materials, electromagnetic property and phase transformation etc., the high-energy density particle beams (electronics under shock loading
Beam, X-ray, laser etc.) to being had important application in the wide fields such as the research of effect (see explosion by beam radiation) of material.
As described above, elastic wave is one kind of stress wave, it is stress and strain caused by disturbance or external force in elasticity
The form transmitted in medium.Elastic force in elastic fluid between particle there is interaction.When somewhere, material particle is left flat
Weigh position, that is, when straining, which vibrates under the action of elastic force, while cause again the strains of ambient particles with
Vibration, communication process of the vibration formed in this way in elastic fluid are known as " elastic wave ".In vibration place of arrival stress and answer
Change will change.Elastic wave theory comparative maturity, be widely used in earthquake, geological prospecting, mining, material it is lossless
Flaw detection, the antidetonation antiknock of engineering structure, rock-soil dynamics etc..
When resonance refers to that the frequency of mechanical system institute excited target is close with certain rank intrinsic frequency of the system, system amplitude
The phenomenon that significantly increasing.Resonance is harmful under normal circumstances, can cause mechanically and structurally very big deformation and dynamic stress, very
To sexual behavior event is damaged, it is no lack of example in engineering history.Also there is the vibrating machine developed using resonance principle, can be used smaller
Power complete certain technical process, such as resonance screens.In addition, there are also radio, the oscillator of placing concrete, pulverizer,
The fields such as vialog, electricity vibration pump, tachymeter, micro-wave oven, musical therapy, particle accelerator are useful for resonance principle.In addition, existing
There is the anti-resonance measure to mechanical equipment mainly to have: improving mechanical structure or change excitation, avoid mechanical intrinsic frequency
Driving frequency；Using vibration absorber；Quickly through resonance region in mechanical actuation or docking process.
Summary of the invention
Present inventor prevents the solution of setting about beginning one's study of driving level from asking from the energy conservation of engine and diesel engine
The method of topic.When being surprised to find that so that engine keeps a kind of subresonance state, it is able to achieve desired result.
Present invention firstly provides a kind of resonance or subresonance to destroy method, specifically a kind of to utilize stress wave resonance or Asia altogether
Vibration destruction method, for destroying the object of unknown intrinsic frequency, described method includes following steps:
1) object to be destroyed unknown to natural frequency ω is further applied load frequency in the frequency conversion load stress wave of 1~θ of θ 2, swashs
The hair object to be destroyed generates natural stress wave, i.e. the intrinsic frequency of some Loading frequency θ and object to be destroyed in 1~θ of θ 2
ω is same or similar and both load stress wave and natural stress wave is made to reach resonance or subresonance state；If frequency is 1~θ of θ 2
Frequency conversion load stress wave fail to excite object to be destroyed to generate natural stress wave, then adjust the frequency range of load stress wave extremely
3~θ of θ 4 is tested again and object to be destroyed is made to generate natural stress wave；
It is learnt according to the frequency value or range of the load stress wave applied when destroying object and generating natural stress wave
The natural frequency ω of object to be destroyed；
2) the fixed load stress wave of frequency, Loading frequency θ and its natural frequency ω are applied to the object to be destroyed
It is equal or close, so that the load stress wave that applies and forming resonance or subresonance wait destroy between object and destroying the object；
Wherein it is equal with the i.e. natural frequency of vibration ω of intrinsic frequency to refer to Loading frequency θ for the resonance, and the subresonance refers to
The ratio range of Loading frequency θ and natural frequency ω is between 0.75~1.25 and is not equal to 1.
In a kind of specific embodiment, Loading frequency is frequency consecutive variations in the frequency conversion load stress wave of 1~θ of θ 2
Load stress wave or frequency stepped change (step by step change) frequency conversion load stress wave.
Skilled person will appreciate that, the θ 1, θ 2, θ 3 and θ 4 are four kinds of Loading frequency values, and wherein θ 3 and θ 2 can be with
Equal or different, same θ 4 and θ 1 can be equal or different；And the range of 1~θ of θ 2 and the range of 3~θ of θ 4 can have it is Chong Die or
It is not overlapped, this is all unrestricted in the present invention.
In a kind of specific embodiment, treating and destroying the load stress wave that object applies is laser, i.e. frequency conversion load
Stress wave is frequency conversion laser, and the load stress wave that frequency is fixed is to determine frequency laser.
The present invention provide again it is a kind of resonance or subresonance destroy method, it is specifically a kind of using stress wave resonance or subresonance
Destruction method, for destroying the object of unknown intrinsic frequency, which comprises treat and destroy object while applying two or two
A above load stress wave, and any two load stress wave in the two load stress waves or multiple load stress waves
Loading frequency θnWith θmBetween it is equal or close so that between two or more load stress waves formed resonance or subresonance state,
The object on intersection point to destroy the direction of propagation line in two or more load stress waves；The resonance refers to frequency θn
=θm, i.e., the frequency ratio of two load stress waves is θn/θm=1, the subresonance refers to θn/θmRatio range 0.75
Between~1.25 and it is not equal to 1.
A kind of any two load in specific embodiment, in two load stress waves or multiple load stress waves
The angle α of the direction of propagation line of stress wave is 0 ° of α≤30 ° <, preferably 0 ° of α≤15 ° <, more preferable 0 ° of α≤5 ° <.
In the present invention, the angle α of the direction of propagation line of two load stress waves is as small as possible, so that two-way load stress
Both wave is bordering on parallel and towards identical, is conducive to the focusing between two load stress waves, i.e., is easier imaging overlapping.
A kind of any two load in specific embodiment, in two load stress waves or multiple load stress waves
The frequency of stress wave can individually be calculated and determined, to obtain the purpose that orientation is destroyed and destroyed, and its frequency ratio is
0.85≤θn/θm≤ 1.15, preferably 0.95≤θn/θm≤ 1.05, more preferable θn/θm=1.
Skilled person will appreciate that, any two load in two load stress waves or multiple load stress waves is answered
Between Reeb in addition to frequency is equal, preferably its payload values is also equal, realizes strongest resonance destruction state with this.
The present invention also provides a kind of method for releasing resonance, the method is existing for releasing to provide third road stress wave
Two-way stress wave between the resonance state that has occurred and that, the frequency that the existing two-way stress wave of resonance state occurs is equal, and
The frequency of the third road stress wave of offer is not equal to the frequency of existing two-way stress wave.
Skilled artisans will appreciate that, for Mr. Yu's device, the existing two-way stress wavelength-division resonated
Not Wei load stress wave and when natural stress wave, apply the third road stress wave of a frequency and its significant difference to device, and
When the load of third road stress wave is same or similar with the load stress wave, the speed of the former resonance of releasing is faster, effect is better.
And for Mr. Yu's device, when the existing two-way stress wave to resonate is load stress wave respectively, in existing two-way
Loading stress bourbon applies the third road stress wave of a frequency and resonant frequency significant difference, and third road stress wave to device
Load when being determined as certain preferred value, the speed for releasing former resonance is faster, effect is better.In addition, those skilled in the art can manage
Xie Di, the newly-increased stress wave for releasing resonance should not necessarily be limited by all the way, can be while increasing third road and the 4th road stress wave newly
To release original resonance state, and the rest may be inferred can increase a plurality of stress wave.In addition, skilled artisans will appreciate that
, if necessary, original subresonance state can be equally released using the method for the present invention for releasing resonance.
The present invention also provides the method that another releases resonance, the resonance is to apply two simultaneously to object to be destroyed
Or more than two load stress waves and the resonance state that generates, the method for releasing resonance include that adjustment is any all the way or more
The frequency of road-load lotus stress wave keeps its frequency different from the frequency of loading stress wave that another way frequency is constant, to release altogether
Vibration.
Skilled artisans will appreciate that ground, the frequency for adjusting one or more any loading stress wave includes by it
Frequency is set to zero, that is, closes the situation of the road load stress wave.
In conclusion present invention firstly provides a kind of resonance or subresonance to destroy method, the method includes successively using
Frequency conversion load stress wave and determine frequency load stress wave for destroy object or the method be the two or more frequencies of use it is identical or
Similar load stress wave resonance or subresonance achieve the purpose that destroy object on the intersection point of its direction of propagation line.The present invention also mentions
For a kind of method for releasing resonance, the method is to provide third road stress wave for releasing between existing two-way stress wave
Resonance state through occurring, and the frequency of the third road stress wave provided is not equal to the frequency of existing two-way stress wave.
The present invention makes full use of the resonance generated between stress wave and subresonance state, realizes that resonance or subresonance destroy respectively
And the purpose of resonance is released, it solves the problems, such as existing in the prior art each.
Detailed description of the invention
Fig. 1 is spoke frequency curve graph disclosed in " structural mechanics " textbook,
Fig. 2 is laser target shooting method schematic diagram provided by the invention.
Specific embodiment
The of textbook " structural mechanics " the Chinese building material industry publishing house first edition (in August, 2003) edited from Liu Jinchun
15 chapter Structural Dynamicses page 303~305 (wherein Figure 15-23 amplitude frequency curve of page 304 is attached drawing 1 in the present invention) are it is found that power
Coefficient, that is, magnificationfactorβ only with the Loading frequency θ of two stress waves of collision, intrinsic frequency, that is, natural frequency of vibration ω and damping
It is more related than ξ.In the range of 0≤damping ratio ξ≤1, resonated when θ/ω=1 between load stress wave and natural stress wave,
And multiplexing dynamic force state is generated when 0.75≤θ/ω≤1.25 and θ/ω ≠ 1, between load stress wave and natural stress wave, I
Be referred to as subresonance state.At this point, if damping ratio ξ it is smaller i.e. its value more level off to 0 when, in the resonance state of θ/ω=1,
The coefficient of impact, that is, magnificationfactorβ is intended to infinity, and in the subresonance state of 0.75≤θ/ω≤1.25 and θ/ω ≠ 1,
And with damping ratio ξ it is smaller i.e. its value more level off to 0 when, the coefficient of impact, that is, magnificationfactorβ is bigger.
The introduction of the prior art all only provides and avoids resonance state within the engine as far as possible, and does not have tried to exploitation one
Kind subresonance state is the engine for running normality.As pointed out in above-mentioned " structural mechanics " page 305: however, even if due to ξ
It influences β and is not increased to infinity, but its value is still very big, when especially damping smaller, the generation of covibration is to endanger very much
Danger, it is possible to lead to the destruction for causing structure itself.Therefore, in Practical Project, the design of especially large-scale important feature,
It should be noted that carrying out the natural frequency of vibration ω of control structure by adjusting the distribution of quality and rigidity, or increase damping, reduces vibration amplitude
Or take measures the influence for reducing vibration source to structural system.
Embodiment 1
The present embodiment provides a kind of monochromatic light source laser carry out laser lithotripsy or laser target shooting and a kind of double light source laser into
The method of row laser lithotripsy or laser target shooting.
In this field, there is corresponding resonance destruction method to the object of known intrinsic frequency.Such as to known intrinsic
The aircraft of frequency can apply the laser of the Loading frequency θ equal with its natural frequency ω to it, so that load stress wave and solid
There is stress wave is equal to destroy aircraft to which resonance occur.Either in laser lithotripsy field, when known to the intrinsic frequency of calculus (or
Substantially in the range) when, it can directly use the laser equal with its frequency to generate resonance with calculus and rapidly destroy calculus.
And if when the intrinsic frequency of the calculus is unknown and frequency inconsistent (frequency phase-difference is larger) of laser with application, there can be no
Resonance or subresonance state, and it is only capable of the orientation destructive power using laser photon itself.Therefore, it at this time generally requires through excessive
Secondary rubble side becomes effective.Such as existing laser lithotripsy generally uses wavelength for 2.1 μm, i.e. the fixed pulsed Bladder stone of frequency
Rubble is carried out, thus the laser lithotripsy operation of certain patients may carry out repeatedly.And those skilled in the art is generally not
It is variant between its intrinsic natural frequency of vibration ω in view of different calculus.
For this problem, the invention proposes two different resonance or subresonance to destroy method.One is single loads
Frequency conversion stress wave (single channel frequency conversion laser) first finds out the intrinsic frequency of object to be destroyed (UFO or calculus), then applies and determine
Frequency stress wave (the fixed laser of frequency, or equally replaced with the frequency conversion laser of frequency range amplitude very little) and object to be destroyed
Body occurs resonance or subresonance and destroys object.Another method is directly to treat to destroy object and apply the frequencies of determining of double loads to answer
Reeb, this two-way determine that resonance or subresonance occurs and destroys the object on its intersection point between frequency stress wave.Because of the invention of variable-frequency power sources
So that frequency conversion stress wave such as frequency conversion laser becomes contents known in the prior art, the present inventor is first using frequency conversion laser
The intrinsic natural frequency of vibration of calculus is found, then destroys calculus under multiplexing dynamic force state, if it is considered that in organism such as human body
Violent broken effect under possible unbearable resonance state can then make to destroy in certain accurate frequency by minute design
It is carried out under the subresonance state of rate ratio.Specifically, in the first resonance of the present invention or subresonance destruction method, such as swashing
Light is practiced shooting, and when carrying out laser target shooting to the unknown external aircraft of intrinsic frequency, first can apply one to the external aircraft
The load stress wave (frequency conversion laser) of a frequency conversion, if varying to Loading frequency is θxWhen, load stress wave and external aircraft it
Between there is subresonance or resonance state, i.e., external aircraft produces natural stress wave, therefore and it can be seen that external aircraft
Natural frequency ω, value and Loading frequency θxEqual or close, recycling frequency-invariant is θxOr and θxThe load of similar frequency
Laser is applied on the external aircraft, so that the two resonates (or subresonance) and achievees the purpose that destroy external aircraft.
Principle of this method for laser lithotripsy is identical.And in second of resonance of the invention or subresonance destruction method, example
It is such as used for laser target shooting, then the almost parallel laser of two-way is directly applied simultaneously to external aircraft, the light source of two-way laser is most
Measure close, the two is directed to the external aircraft, and the frequency of two-way laser is equal and to generate resonance described external to destroy
Aircraft.The schematic diagram of the method is as shown in Figure 2.
Embodiment 2
It destroys the present embodiment provides resonance is realized between the double load stress waves of application in the method for object on its intersection point
Another embodiment.Specifically double equal planoconvex lens of light source generate resonance after focusing, and generated energy is for heating stone etc.
High-melting-point substances.
Under sunlight, when using a piece of convex lens focusing sunlight, the scraps of paper placed in its focus are easy burning, but
The heating speed of the substances such as the stone placed in focus is slower.
The identical convex lens focusing sunlight of two panels, two panels convex lens are set under same sunlight, on same plane
Between as close as possible in order to focus, two-way sunlight produces resonance, and placing scraps of paper in its common focus area can fire rapidly
To the greatest extent, the rate of rise in temperature of the stone of placement is very fast, or even can achieve the effect that melt in stone.
Embodiment 3
The method that double load stress waves provided by the invention realize that resonance or subresonance destroy is applied in the present embodiment
Explosion field can substantially save explosive consumption.
It is usually to go to break the substances such as tunnel ground using the densely covered blasting charge in existing explosion field, it is fried designs it
It generally only considered the explosion amount of the single blasting charge and the collaboration efficiency of multiple blastings charge when pack position, and not for every
Its intrinsic frequency is made between two blastings charge to investigate and stress wave calculating.Therefore, in existing explosion, some regions occur
Resonance or subresonance state thus the burst region occur comminuted explosion as a result, and other many regions only play
Thus its demolition effect is limited for the active force of the single blasting charge itself.
The present invention in view of explosion stress wave profile be frequency is constant and amplitude decay mechanical periodicity curve, by setting
The ratio for counting the stress wave frequency rate of the adjacent explosive parlor of every two, particular by design and calculate its alternate position spike, the time difference and
The parameters such as phase difference to form resonance or subresonance state between the two in explosion, reach energy multiplication output and (or substantially save
About explosive charge) and the accurately effect of directional blasting.It can influence each other when packaging fried in view of each explosive, setting position is faced
Close explosive parlor intrinsic frequency differs bigger meeting so that the resonance or subresonance state that have generated are forced to release, thus of the invention
The method of offer needs the burst time to each blasting charge (or all blastings charge in interactional region) and its consolidates
There is frequency to make accurately to calculate.Being finally reached method provided by the invention can hundreds and thousands of times of ground reduction for engineering explosion
The effect of explosive consumption.
Other than the application provided in above-described embodiment, method provided by the invention can also be filled in other fields
Divide application, as long as the method for the invention may all be can be used by being related to mechanics and kinematic field.Such as:
1) applied to fields such as molecule, atom, electronics, the ions of interior of articles, in particle accelerator.
2) it is applied to electric power magnetic field field: if the essence of magnetic field, electric current, laser, explosion wave is also all load stress
Wave, motor can produce load stress wave.
Generally speaking, the stress wave collision method provided through the invention can slightly improve existing many equipment,
The energy consumption that device is substantially reduced in the case where output power is constant can be realized.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (2)
1. a kind of resonance or subresonance destroy method, specifically a kind of to destroy method using stress wave resonance or subresonance, it is used for
Destroy the object of unknown intrinsic frequency, which comprises it treats destruction object while applying more than two load stress waves,
And the Loading frequency θ of any two load stress wave in this multiple load stress wavenWith θmBetween it is equal or close so that more
Resonance or subresonance state are formed between a load stress wave, to destroy the direction of propagation line in multiple load stress waves
Object on intersection point；The resonance refers to frequency θn=θm, i.e., the frequency ratio of two load stress waves is θn/θm=1, it is described
Subresonance refers to θn/θmRatio range between 0.75~1.25 and be not equal to 1, and in multiple load stress waves formed resonance or
The angle α of the direction of propagation line of any two load stress wave of subresonance state is 0 ° of α≤5 ° <.
2. method according to claim 1, which is characterized in that any two load stress wave in multiple load stress waves
Frequency can individually be calculated and determined, to obtain the purpose that orientation is destroyed and destroyed, and its frequency ratio is θn/θm=1.
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| CN201610190209.8A CN105865274B (en) | 2016-03-30 | 2016-03-30 | Resonance or subresonance destroy method |
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Citations (5)
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|---|---|---|---|---|
| CN102102446A (en) * | 2009-12-22 | 2011-06-22 | 刘传胜 | Method for destroying disused structure by using same-frequency resonance |
| CN102506621A (en) * | 2011-10-10 | 2012-06-20 | 中国神华能源股份有限公司 | Method for determining coal mine blasting mode based on principal vibration frequency of flood-control dam system |
| CN104453275A (en) * | 2014-10-23 | 2015-03-25 | 中冶集团武汉勘察研究院有限公司 | Method for demolishing building or building components based on resonance principle |
| CN105091681A (en) * | 2014-05-22 | 2015-11-25 | 南京大五教育科技有限公司 | Building blasting device based on infrasonic wave resonance technology |
| CN105275435A (en) * | 2015-11-24 | 2016-01-27 | 中国矿业大学 | Accurate time-delay presplitting blasting reinforcement coal seam gas extraction method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102102446A (en) * | 2009-12-22 | 2011-06-22 | 刘传胜 | Method for destroying disused structure by using same-frequency resonance |
| CN102506621A (en) * | 2011-10-10 | 2012-06-20 | 中国神华能源股份有限公司 | Method for determining coal mine blasting mode based on principal vibration frequency of flood-control dam system |
| CN105091681A (en) * | 2014-05-22 | 2015-11-25 | 南京大五教育科技有限公司 | Building blasting device based on infrasonic wave resonance technology |
| CN104453275A (en) * | 2014-10-23 | 2015-03-25 | 中冶集团武汉勘察研究院有限公司 | Method for demolishing building or building components based on resonance principle |
| CN105275435A (en) * | 2015-11-24 | 2016-01-27 | 中国矿业大学 | Accurate time-delay presplitting blasting reinforcement coal seam gas extraction method |
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