CN103440369B - The optimization method of Pulse Source and device - Google Patents
The optimization method of Pulse Source and device Download PDFInfo
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Abstract
The embodiment of the present invention provides optimization method and the device of a kind of Pulse Source, and described Pulse Source includes framework, weight, flat board and ballast；Wherein, described method includes: utilize flat board-the earth FEM (finite element) model of pre-building that Pulse Source plate impact process is analyzed, to obtain the deformation of flat board and/or acceleration change situation and/or impact stress wave loops situation；Based on the deformation of flat board and/or acceleration change situation and/or impact stress wave loops situation, it is determined that flat board is hit the rule of produced stress wave；Be hit the rule of produced stress wave based on flat board, and Pulse Source is optimized.According to the method and device, it is possible to reduce analysis cost, improve analysis efficiency, thus the optimization reducing Pulse Source is designed and developed cost and shortens the construction cycle.
Description
Technical Field
The invention relates to the field of pulse seismic sources, in particular to an optimization method and device of a pulse seismic source.
Background
The pulse seismic source is an excitation energy source used for small refraction method, micro-logging method, Vertical Seismic Profiling (VSP) and shallow exploration. The working principle is as follows: the heavy hammer is accelerated to fall down to impact the flat plate, so that shock waves which can be used for exploration are generated and transmitted into the stratum through the flat plate, and through analyzing the propagation process of the shock waves in the stratum, the related information of the stratum structure of an exploration area is obtained, and further whether mineral resources exist in the area or not is preliminarily estimated.
For an impulse signal source used for seismic exploration, the basic technical requirements are as follows: 1) has sufficient signal energy; 2) to ensure a high resolution of the signal, the signal pulses should have as narrow a duration as possible; 3) the jump is dry and crisp and the signal is first arrived; 4) the signal waveform has good repeatability and is stable; 5) the signal excitation source has the characteristic of low noise (such as background noise like mechanical vibration and weight rebound). The flat plate is a main part of a pulse seismic source, is a source for generating shock waves, and is a key execution element for finally transmitting energy into the ground. Since the characteristics (such as structure, material, etc.) of the flat plate have great influence on the form, bandwidth and amplitude of the pulse stress wave, analyzing the formation and propagation related parameters of the impact wave under different impact conditions of different flat plate materials and structures has important significance on the optimization design development of the pulse seismic source.
At present, there are two main methods for analyzing the impact process of the impulse source flat plate: analytical analysis and experimental analysis. The impulse source flat plate impact process is very complex, so that the analysis and the analysis of the impact process are difficult to realize and very complex; the experimental analysis method has high precision, but has the defects of high cost and complex operation, and is generally used for final strength verification only before the optimized design is finalized and put into use, so that the method is not suitable for being adopted in the optimized design process.
It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the invention.
Disclosure of Invention
The invention aims to provide an optimization method and device of a pulse seismic source, which can reduce the analysis cost and improve the analysis efficiency, thereby reducing the optimization design development cost of the pulse seismic source and shortening the development period.
According to one aspect of the invention, an optimization method of a pulse seismic source is provided, wherein the pulse seismic source comprises a frame, a heavy hammer, a flat plate and a press weight; wherein the method comprises the following steps: analyzing the impulse source flat plate impact process by utilizing a pre-established flat plate-geodetic finite element model to obtain the deformation condition, the acceleration change condition and/or the shock stress wave transmission condition of the flat plate; determining the rule of stress waves generated by the flat plate under impact based on the deformation condition, and/or the acceleration change condition and/or the shock stress wave transmission condition of the flat plate; and optimizing the pulse seismic source based on the rule of the stress wave generated by the impact on the flat plate.
According to another aspect of the invention, an optimization device of a pulse seismic source is provided, wherein the pulse seismic source comprises a frame, a heavy hammer, a flat plate and a press weight; wherein the apparatus comprises: the analysis unit is used for analyzing the impulse source flat plate impact process by utilizing a pre-established flat plate-geodetic finite element model so as to obtain the deformation condition, the acceleration change condition and/or the shock stress wave transmission condition of the flat plate; determining the rule of stress waves generated by the flat plate under the impact based on the deformation condition, the acceleration change condition and/or the shock stress wave transmission condition of the flat plate; and the optimization unit is used for optimizing the pulse seismic source based on the rule of the stress wave generated by the impact on the flat plate.
The invention has the beneficial effects that: the analysis cost is reduced, the analysis efficiency is improved, and therefore the optimization design development cost of the pulse seismic source can be reduced, and the development period is shortened.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.
Drawings
Many aspects of the invention can be better understood with reference to the following drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. For convenience in illustrating and describing some parts of the present invention, corresponding parts may be enlarged or reduced in the drawings. Elements and features depicted in one drawing or one embodiment of the invention may be combined with elements and features shown in one or more other drawings or embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views, and may be used to designate corresponding parts for use in more than one embodiment.
In the drawings:
FIG. 1 is a schematic view of the structure of a pulsed seismic source according to embodiment 1 of the present invention;
FIG. 2 is a flow chart of a method of optimizing an impulsive seismic source according to embodiment 1 of the invention;
FIG. 3 is a flowchart of a method of establishing a flat-earth finite element model according to embodiment 1 of the present invention;
FIG. 4 is a schematic structural diagram of an optimization apparatus for a pulsed seismic source according to embodiment 2 of the present invention;
FIG. 5 is a schematic structural diagram of a modeling module according to embodiment 2 of the present invention.
Detailed Description
Various embodiments of the present invention will be described below with reference to the accompanying drawings. These embodiments are merely exemplary and are not intended to limit the present invention.
Example 1
Fig. 1 is a schematic view of the structure of a pulsed seismic source according to embodiment 1 of the present invention. As shown in fig. 1, the impulsive source includes: frame 101, weight 102, plate 103, and weights 104 and 105 represent the ground. Wherein, the weight 102 is fixed on the frame 101 and can freely fall down to impact the flat plate 103; the plate 103 contacts the earth 105, and when the plate 103 is impacted by the weight 102, the plate 104 generates a shock wave and transmits the shock wave to the earth 105.
Fig. 2 is a flowchart of the method for optimizing the impulsive seismic source according to embodiment 1 of the present invention. As shown in fig. 2, the method includes:
step 201: analyzing the impulse source flat plate impact process by utilizing a pre-established flat plate-geodetic finite element model to obtain the deformation condition, the acceleration change condition and/or the shock stress wave transmission condition of the flat plate;
step 202: determining the rule of stress waves generated by the flat plate under impact based on the deformation condition, and/or the acceleration change condition and/or the shock stress wave transmission condition of the flat plate;
step 203: and optimizing the pulse seismic source based on the rule of the stress wave generated by the impact on the flat plate.
According to the embodiment, the pulse seismic source flat plate impact process is analyzed based on the flat plate-geodetic finite element model, so that the rule of stress waves generated by the flat plate under impact is determined, the pulse seismic source is optimized based on the rule, the analysis cost can be reduced, the analysis efficiency can be improved, the optimization design development cost of the pulse seismic source can be reduced, and the development period can be shortened.
In this embodiment, the method may further include:
step 204: and establishing a plate-earth finite element model.
Wherein this step is an optional step, indicated by a dashed line in fig. 2.
In the present embodiment, any method of the prior art may be used to create the slab-earth finite element model. FIG. 3 is a flowchart of a method for creating a finite element slab-earth model according to the present embodiment, but the present invention is not limited to this method.
As shown in fig. 3, the method of creating a slab-earth finite element model includes:
step 301: establishing a finite element model of the impulse seismic source impact process by utilizing a three-dimensional geometric solid model;
step 302: establishing a ground vibration finite element model, a contact interface of the heavy hammer and the flat plate and a contact interface of the flat plate and the ground by using an explicit nonlinear dynamics method;
step 303: and establishing a plate-geodetic finite element model based on the finite element model of the impulse seismic source impact process, the geodetic vibration finite element model, the contact interface of the heavy hammer and the plate and the contact interface of the plate and the ground.
In step 301 of this embodiment, the finite element model of the impulse source impact process may include, for example, finite element models of a frame, a weight, a plate, and a ground, but the invention is not limited thereto.
In step 302 of the present embodiment, the finite element model of the earth vibration, the contact interface between the weight and the flat plate, and the contact interface between the flat plate and the earth are established by using the explicit nonlinear dynamics method, wherein the finite element model and the contact interface can be established by using any one of the existing explicit nonlinear dynamics methods. For example, a finite element model of earth vibration may be established using a Duake-Prager model, a contact interface of a weight and a plate may be established using a penalty function method, and a contact interface of a plate and the earth may be set as a viscous boundary using a spring-damper. The present invention is not limited to these methods.
In step 303 of this embodiment, when the flat-geodetic finite element model is built, the impact of the weight may be simplified into a load with impact power and positive pressure and input into the finite element model of the impulse source impact process, and the weight of the impulse source may be simplified into a force and a five-degree-of-freedom constraint and input into the finite element model of the impulse source impact process, where the force is equal to the gravity of the weight.
In this way, by simplifying the impact of the weight and the weight of the pulse source, the model can be further simplified, and the analysis efficiency can be improved.
In step 201 of this embodiment, the impulsive source plate impact process is analyzed according to the plate-earth finite element model, wherein the purpose of analyzing the impulsive source plate impact process is to analyze the parameters related to the formation and propagation of shock waves under different impact conditions by different plate parameters, so that at least one of the following three analysis methods may be performed, but the invention is not limited to these analysis methods and contents:
analyzing the deformation condition of the flat plate and/or the acceleration change curve of the flat plate and/or the shock stress wave transfer curve of the flat plate according to the difference of the impact power of the heavy hammer; for example, the deformation condition, the acceleration change curve, and the shock stress wave transfer curve of the flat plate can be analyzed under the condition that the impact energy of the weight is respectively 3 kilojoules, 4 kilojoules, and 5 kilojoules;
under the maximum impact power of the heavy hammer, analyzing an acceleration curve of the flat plate and/or a shock stress wave transfer curve of the flat plate according to the difference of the weight of the heavy hammer; for example, the maximum impact energy of the weight is 5 kilojoules, and at this time, when the weight is 120%, 100% and 80% of the maximum impact force, the deformation condition, the acceleration change curve and the shock stress wave transmission curve of the flat plate are analyzed respectively;
analyzing the deformation condition of the flat plate, and/or the acceleration change curve of the flat plate, and/or the shock stress wave transfer curve of the flat plate according to the difference of the material, and/or the shape and/or the size of the flat plate; for example, when the materials of the flat plate are 45 steel, high-strength aluminum alloy and high-strength copper alloy, the deformation condition, the acceleration change curve and the shock stress wave transmission curve of the flat plate are analyzed; for another example, when the shape of the flat plate is circular, square or frustum, the deformation condition, the acceleration change curve and the shock stress wave transfer curve of the flat plate are analyzed; for another example, the area of the bottom surface of the flat plate is 0.36m2And 1.44m2And (4) analyzing the deformation condition, the acceleration change curve and the shock stress wave transfer curve of the flat plate.
Therefore, through the analysis, the shock waves formed by different panel parameters under different impact conditions and the related parameters for propagating the shock waves can be obtained, so that the rule of the stress waves generated by the panel under impact is determined, the optimization direction of the panel is determined, and the pulse seismic source is optimized according to the rule.
According to the embodiment, the pulse seismic source flat plate impact process is analyzed based on the flat plate-geodetic finite element model, so that the rule of stress waves generated by the flat plate under impact is determined, the pulse seismic source is optimized based on the rule, the analysis cost can be reduced, the analysis efficiency can be improved, the optimization design development cost of the pulse seismic source can be reduced, and the development period can be shortened. Furthermore, the impact of the heavy hammer and the weight of the pulse seismic source are simplified, so that the model can be further simplified, and the analysis efficiency is improved.
Example 2
Fig. 4 is a schematic structural diagram of an apparatus 400 for optimizing an impulsive seismic source according to embodiment 2 of the present invention, which corresponds to the method for optimizing an impulsive seismic source according to embodiment 1. As shown in fig. 4, the apparatus 400 includes an analysis module 401 and an optimization module 402. Wherein,
the analysis module 401 is configured to analyze the impulse source flat plate impact process by using a pre-established flat plate-geodetic finite element model to obtain a deformation condition, and/or an acceleration change condition, and/or a shock stress wave transmission condition of the flat plate; determining the rule of stress waves generated by the flat plate under the impact based on the deformation condition, the acceleration change condition and/or the shock stress wave transmission condition of the flat plate;
the optimization module 402 is configured to optimize the pulsed seismic source based on a rule of a stress wave generated by the impact on the slab.
According to the embodiment, the pulse seismic source flat plate impact process is analyzed based on the flat plate-geodetic finite element model, so that the rule of stress waves generated by the flat plate under impact is determined, the pulse seismic source is optimized based on the rule, the analysis cost can be reduced, the analysis efficiency can be improved, the optimization design development cost of the pulse seismic source can be reduced, and the development period can be shortened.
In this embodiment, the apparatus may further include:
and a modeling module 403 for establishing a flat-earth finite element model.
Wherein the component is an optional component, indicated in fig. 4 by dashed lines.
In the present embodiment, any method of the prior art may be used to create the slab-earth finite element model. Fig. 5 is a schematic structural diagram of the modeling module of the present embodiment, but the present invention is not limited to this structure. As shown in fig. 5, the modeling module 403 includes: a first modeling unit 501, a second modeling unit 502, and a third modeling unit 503. Wherein,
the first modeling unit 501 is used for establishing a finite element model of the impulse seismic source impact process by using a three-dimensional geometric solid model;
the second modeling unit 502 is used for establishing a ground vibration finite element model, a contact interface of a heavy hammer and a flat plate, and a contact interface of the flat plate and the ground by using an explicit nonlinear dynamics method;
the third modeling unit 503 is configured to establish a plate-ground finite element model based on the finite element model of the impulse source impact process, the ground vibration finite element model, the contact interface between the heavy hammer and the plate, and the contact interface between the plate and the ground.
In this embodiment, the method of establishing the finite element model of the impulsive source impact process, the geodetic finite element model, the contact interface between the weight and the slab, and the contact interface between the slab and the ground, the method of establishing the slab-geodetic finite element model, and the method of analyzing the impulsive source slab impact process according to the slab-geodetic finite element model are the same as those described in embodiment 1, and will not be repeated here.
According to the embodiment, the pulse seismic source flat plate impact process is analyzed based on the flat plate-geodetic finite element model, so that the rule of stress waves generated by the flat plate under impact is determined, the pulse seismic source is optimized based on the rule, the analysis cost can be reduced, the analysis efficiency can be improved, the optimization design development cost of the pulse seismic source can be reduced, and the development period can be shortened. Furthermore, the impact of the heavy hammer and the weight of the pulse seismic source are simplified, so that the model can be further simplified, and the analysis efficiency is improved.
The above devices and methods of the present invention can be implemented by hardware, or can be implemented by hardware and software. The present invention relates to a computer-readable program which, when executed by a logic section, enables the logic section to realize the above-described apparatus or constituent section, or to realize the above-described various methods or steps.
The present invention also relates to a storage medium such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, or the like, for storing the above program.
While the invention has been described with reference to specific embodiments, it will be apparent to those skilled in the art that these descriptions are illustrative and not intended to limit the scope of the invention. Various modifications and alterations of this invention will become apparent to those skilled in the art based upon the spirit and principles of this invention, and such modifications and alterations are also within the scope of this invention.
Claims (8)
1. A method for optimizing a pulse seismic source, wherein the pulse seismic source comprises a frame, a heavy hammer, a flat plate and a ballast weight; wherein the method comprises the following steps:
analyzing the impulse source flat plate impact process by utilizing a pre-established flat plate-geodetic finite element model to obtain the deformation condition, the acceleration change condition and/or the shock stress wave transmission condition of the flat plate;
determining the rule of stress waves generated by the flat plate under impact based on the deformation condition, and/or the acceleration change condition and/or the shock stress wave transmission condition of the flat plate;
optimizing a pulse seismic source based on the rule of stress waves generated by the impact on the flat plate;
analyzing the impulse source flat plate impact process by using a pre-established flat plate-geodetic finite element model to obtain the deformation condition, the acceleration change condition and/or the shock stress wave transmission condition of the flat plate, wherein the conditions comprise the following conditions:
analyzing the deformation condition of the flat plate, and/or the acceleration change curve of the flat plate, and/or the shock stress wave transfer curve of the flat plate according to the difference of the impact power of the heavy hammer;
under the maximum impact power of the heavy hammer, analyzing an acceleration curve of the flat plate and/or a shock stress wave transfer curve of the flat plate according to the difference of the weights;
according to the difference of the material, and/or the shape and/or the size of the flat plate, the deformation condition of the flat plate, and/or the acceleration change curve of the flat plate, and/or the shock stress wave transmission curve of the flat plate are analyzed.
2. The method of claim 1, wherein the method further comprises: establishing a flat-earth finite element model;
the establishing of the plate-earth finite element model comprises the following steps:
establishing a finite element model of the impulse seismic source impact process by utilizing a three-dimensional geometric solid model;
establishing a ground vibration finite element model, a contact interface of the heavy hammer and the flat plate and a contact interface of the flat plate and the ground by using an explicit nonlinear dynamics method;
and establishing a plate-geodetic finite element model based on the finite element model of the impulse seismic source impact process, the geodetic vibration finite element model, the contact interface of the heavy hammer and the plate and the contact interface of the plate and the ground.
3. The method of claim 2, wherein the finite element model of the impulsive source impact process comprises finite element models of the frame, weight, slab, and earth.
4. The method of claim 2, wherein the establishing a finite element model of earth vibration, the contact interface of the weight and the plate, and the contact interface of the plate and the earth using an explicit nonlinear dynamics method comprises:
the earth vibration finite element model is established by utilizing a Duake-Prager (Drucker-Prager) model, the contact interface of the heavy hammer and the flat plate is established by utilizing a penalty function method, and the contact interface of the flat plate and the earth is set as a viscous boundary by utilizing a spring-damper.
5. The method of claim 2, wherein the building a plate-geodetic finite element model based on the finite element model of the impulsive source impact process, the geodetic finite element model, the contact interface of the weight and the plate, and the contact interface of the plate and the earth comprises:
based on the finite element model of the impulse seismic source impact process, the earth vibration finite element model, the contact interface of the heavy hammer and the flat plate and the contact interface of the flat plate and the earth, the impact of the heavy hammer is simplified into a load with impact power and positive pressure and is input into the finite element model of the impulse seismic source impact process, and the weight of the impulse seismic source is simplified into a force and a five-degree-of-freedom constraint and is input into the finite element model of the impulse seismic source impact process, wherein the force is equal to the gravity of the weight.
6. An optimization device of a pulse seismic source, wherein the pulse seismic source comprises a frame, a heavy hammer, a flat plate and a weight; wherein the apparatus comprises:
the analysis unit is used for analyzing the impulse source flat plate impact process by utilizing a pre-established flat plate-geodetic finite element model so as to obtain the deformation condition, the acceleration change condition and/or the shock stress wave transmission condition of the flat plate; determining the rule of stress waves generated by the flat plate under the impact based on the deformation condition, the acceleration change condition and/or the shock stress wave transmission condition of the flat plate;
the optimization module is used for optimizing the pulse seismic source based on the rule of the stress wave generated by the impact on the flat plate;
the analysis module analyzes the impulse source flat plate impact process by using a pre-established flat plate-geodetic finite element model to obtain the deformation condition, the acceleration change condition and/or the shock stress wave transmission condition of the flat plate, wherein the conditions comprise the following conditions:
analyzing the deformation condition of the flat plate, and/or the acceleration change curve of the flat plate, and/or the shock stress wave transfer curve of the flat plate according to the difference of the impact power of the heavy hammer;
under the maximum impact power of the heavy hammer, analyzing an acceleration curve of the flat plate and/or a shock stress wave transfer curve of the flat plate according to the difference of the weights;
according to the difference of the material, and/or the shape and/or the size of the flat plate, the deformation condition of the flat plate, and/or the acceleration change curve of the flat plate, and/or the shock stress wave transmission curve of the flat plate are analyzed.
7. The apparatus of claim 6, wherein the apparatus further comprises:
a modeling module for establishing a flat-earth finite element model;
the modeling module includes:
the first modeling unit is used for establishing a finite element model of the impulse seismic source impact process by utilizing a three-dimensional geometric solid model;
the second modeling unit is used for establishing a ground vibration finite element model, a contact interface of the heavy hammer and the flat plate and a contact interface of the flat plate and the ground by utilizing an explicit nonlinear dynamics method;
and the third modeling unit is used for establishing a plate-geodetic finite element model based on the finite element model of the impulse source impact process, the geodetic vibration finite element model, the contact interface of the heavy hammer and the plate and the contact interface of the plate and the ground.
8. The apparatus of claim 7, wherein the third modeling unit is configured to reduce the impact of the weight to a load having impact power and positive pressure and input the finite element model of the impulsive source impact process, and reduce the ballasting of the impulsive source to one force and one five-degree-of-freedom constraint and input the finite element model of the impulsive source impact process, based on the finite element model of the impulsive source impact process, the geodetic finite element model, the contact interface of the weight and the slab, and the contact interface of the slab and the earth, wherein the magnitude of the force is equal to the gravitational force of the ballasting.
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