CN114547916B - System and method for eliminating and analyzing low-frequency vibration of rocker arm of slope monitoring radar - Google Patents
System and method for eliminating and analyzing low-frequency vibration of rocker arm of slope monitoring radar Download PDFInfo
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- CN114547916B CN114547916B CN202210434156.5A CN202210434156A CN114547916B CN 114547916 B CN114547916 B CN 114547916B CN 202210434156 A CN202210434156 A CN 202210434156A CN 114547916 B CN114547916 B CN 114547916B
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Abstract
The invention discloses a system and a method for eliminating and analyzing low-frequency vibration of a side slope monitoring radar rotating arm, belongs to the field of radar monitoring, relates to a finite element analysis technology, and is used for selecting proper wall thickness and materials for the radar rotating arm so as to eliminate low-frequency vibration, so that field portable carrying of a foundation micro variable monitoring radar is realized, and the measurement accuracy is improved; the material selection module selects materials and thicknesses of the radar rotating arm structure and sends the materials and the thicknesses to the model building module; the model establishing module establishes a radar rotating arm analysis model; the vibration analysis module establishes a global coordinate and sends a vibration starting signal to the load application module; the load application module applies a load force to the radar rotating arm analysis model along a direction perpendicular to the frame arm; the decision making module is combined with the vibration analysis module to generate a statistical table; and selecting a preferable material and a preferable thickness according to a statistical table, and designing the radar rotating arm structure with the corresponding material thickness.
Description
Technical Field
The invention belongs to the field of radar monitoring, relates to a finite element analysis technology, and particularly relates to a system and a method for eliminating and analyzing low-frequency vibration of a rocker arm of a slope monitoring radar.
Background
The basic concept of radar is formed in the beginning of the 20 th century, the radar technology is developed rapidly, the frequency of the radar is increased from dozens of MHz to more than 500 MHz, and then to 3000 MHz and 10 GHz, the miniaturization of the airborne radar is realized, and the measurement accuracy is improved. The types of radar are developed from pulse radar to solid-state phased array radar, pulse Doppler radar, air defense two-coordinate and three-coordinate warning guide radar, ground-air missile guidance radar, remote missile initial stage target field measurement radar and reentry stage target field measurement, recovery radar and airborne synthetic aperture radar. In civil use, navigation and anti-collision radars of ocean-going ships, navigation control radars of airports, meteorological radars and the like are produced and applied, and the ground-based micro variable monitoring radar is used for deformation monitoring and early warning of buildings such as large strip mine slopes, mountain areas, railway and highway slopes, tunnel bridges and the like.
The existing radar has the characteristics of large volume and heavy weight in military and civil applications, the miniature variable-monitoring radar of the foundation is convenient to carry, simple in disassembly and assembly operability and good in portability, but the rotating arm of the miniature variable-monitoring radar of the foundation is a technical difficulty of portability, and the rotating arm of the radar can vibrate at low frequency if being too thin and can be heavy and inconvenient to carry in the field if being too thick.
Therefore, the invention provides a system and a method for eliminating and analyzing low-frequency vibration of a rocker arm of a slope monitoring radar, which are used for selecting proper wall thickness and materials for the rocker arm of the radar so as to eliminate the low-frequency vibration, realizing the field portable carrying of the miniature variable monitoring radar of a foundation and improving the measurement accuracy.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
In order to achieve the above object, an embodiment according to a first aspect of the present invention provides a slope monitoring radar boom low-frequency vibration elimination analysis system, which includes a radar boom structure, a material selection module, a model establishment module, a load application module, a vibration analysis module, and a decision making module;
the material selection module is used for selecting materials and thicknesses of the radar rotating arm structure; the material selection module inputs the selected material attribute and the corresponding radar rotating arm structure into the model building module;
the model establishing module is used for establishing a radar rotating arm analysis model and sending the radar rotating arm analysis model to the vibration analysis module;
the vibration analysis module is used for carrying out vibration analysis on the radar rotating arm analysis model established by the model establishing module, and the vibration analysis module comprises global coordinate establishment and analog simulation; obtaining amplitude perpendicular to the direction of a frame arm of a radar rotating arm analysis model and frequency response amplitude of stress;
the decision making module sequentially acquires a secondary peak value in the frequency response of Z-direction deformation and a secondary peak value in the frequency response of Z-direction stress, and generates a statistical table by combining materials and thicknesses;
and the decision-making module selects the preferred material and the preferred thickness according to the statistical table and designs the radar rotating arm structure with the corresponding material thickness.
Preferably, the process of selecting the material by the material selection module comprises the following processes:
the material selection module marks the product with numbers according to the type of the material
Wherein i is a positive integer, and i =1,2 … … n; n is the total number of material types; respectively obtaining material attributes of different materials, respectively marking the material attributes as Sij, wherein j represents the serial number of the material attributes, and j =1,2,3 and 4; corresponding to Si1, Si2, Si3, and Si4, the material number i indicates the elastic modulus, the material number i indicates the density, the material number i indicates the poisson's ratio, and the material number i indicates the yield strength.
Preferably, the material selection module divides the radar rotating arm into a plurality of groups of thicknesses according to the adjustable thickness range of the radar rotating arm, wherein the adjustable thickness range is subjected to range adjustment according to the structure of the radar, and the plurality of groups of radar rotating arm thicknesses are respectively marked as
Wherein l is the radar boom thickness number, and l =1,2, … …, m; and m is the total number of the thickness numbers.
Preferably, the material selection module inputs the selected material attributes and the corresponding radar rotating arm structures into the model building module, the model building module generates radar rotating arm models according to the received material attributes and the corresponding radar rotating arm structures, generates a plurality of groups of radar rotating arm models according to the thicknesses of the radar rotating arms set by the material selection module, and marks the plurality of groups of radar rotating arm models with different materials and different thicknesses as radar rotating arm analysis models.
Preferably, the process of the vibration analysis module for global coordinate establishment of the radar rotating arm analysis model comprises the following steps:
a vibration analysis module selects a basic point, the direction perpendicular to the frame arm is marked as a Z axis, the direction parallel to the frame arm is marked as an X axis, and the vertical upward direction is marked as a Y axis;
the base point is selected to be on the plane of the frame arm and is positioned at the center of the connecting position of the frame arm with the third supporting arm and the fourth supporting arm.
Preferably, the process of performing analog simulation on the radar boom analysis model by the vibration analysis module comprises the following steps:
the method comprises the following steps: the vibration analysis module sends a vibration starting signal to the load application module;
step two: after receiving the vibration starting signal, the load application module applies a load force to the radar rotating arm analysis model along the direction vertical to the frame arm; and dividing according to standard grids;
step three: the vibration analysis module acquires the amplitude perpendicular to the direction of a frame arm of the radar rotating arm analysis model and the frequency response amplitude of stress;
step four: and the vibration analysis module sends the obtained amplitude perpendicular to the direction of the radar rotating arm analysis model frame arm and the obtained frequency response amplitude of the stress to the decision making module.
Preferably, the load force is a harmonic load with an amplitude of 10N, a frequency range of 0-210Hz and a frequency interval of 10 Hz.
An embodiment according to a second aspect of the present invention provides a method for analyzing low-frequency vibration elimination of a rotating arm of a slope monitoring radar, comprising the following steps:
the material selection module selects materials and thicknesses of the radar rotating arm structure; sending the selected material and the thickness to a model building module;
the model building module builds a radar rotating arm analysis model according to the radar rotating arm structure, the selected material and the thickness;
the vibration analysis module establishes a global coordinate for the received radar rotating arm analysis model and sends a vibration starting signal to the load application module;
the load application module applies a load force to the radar rotating arm analysis model along a direction perpendicular to the frame arm;
the vibration analysis module acquires the amplitude perpendicular to the direction of a frame arm of the radar rotating arm analysis model and the frequency response amplitude of stress; and sending the data to a decision making module;
the decision making module sequentially acquires a secondary peak value in the frequency response of the Z-direction deformation and a secondary peak value in the frequency response of the Z-direction stress, and generates a statistical table by combining materials and thicknesses;
and the decision making module selects the preferred material and the preferred thickness according to a statistical table and designs the radar rotating arm structure with the corresponding material thickness.
Compared with the prior art, the invention has the beneficial effects that:
the method is used for selecting proper wall thickness and materials for the radar rotating arm so as to eliminate low-frequency vibration, so that the field portable carrying of the foundation miniature variable monitoring radar is realized, and the measurement accuracy is improved; the material selection module selects materials and thicknesses of the radar rotating arm structure and sends the materials and the thicknesses to the model building module; the model building module builds a radar rotating arm analysis model; the vibration analysis module establishes a global coordinate and sends a vibration starting signal to the load application module; the load application module applies a load force to the radar rotating arm analysis model along a direction perpendicular to the frame arm; the decision making module is combined with the vibration analysis module to generate a statistical table; and selecting a preferable material and a preferable thickness according to a statistical table, and designing the radar rotating arm structure with the corresponding material thickness.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a diagram of a swivel arm of the radar of the present invention;
FIG. 3 is a flow chart of the present invention.
In the figure: 1. a frame arm; 2. a connecting arm; 3. a first support arm; 4. a second support arm; 5. a third support arm; 6. and a fourth support arm.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The existing radar has the characteristics of large volume and heavy weight in military and civil applications, the miniature variable-monitoring radar of the foundation is convenient to carry, simple in disassembly and assembly operability and good in portability, but the rotating arm of the miniature variable-monitoring radar of the foundation is a technical difficulty of portability, and the rotating arm of the radar can vibrate at low frequency if being too thin and can be heavy and inconvenient to carry in the field if being too thick.
Therefore, the invention provides a system and a method for eliminating and analyzing low-frequency vibration of a rotating arm of a slope monitoring radar.
The embodiment of the invention provides a low-frequency vibration elimination analysis system for a rotating arm of a slope monitoring radar. Referring to fig. 1, fig. 1 is a schematic diagram of a low-frequency vibration elimination analysis system for a tumbler of a slope monitoring radar according to an embodiment of the present invention.
As shown in fig. 1, a slope monitoring radar rotating arm low-frequency vibration elimination analysis system comprises a radar rotating arm structure, a material selection module, a model establishment module, a load application module, a vibration analysis module and a decision making module;
as shown in fig. 2, in the present application, the radar boom structure includes a frame arm 1, a connecting arm 2, and two supporting arms, where the number of the supporting arms is four, and the supporting arms are a first supporting arm 3, a second supporting arm 4, a third supporting arm 5, and a fourth supporting arm 6; one end of each of the two connecting arms 2 is fixedly connected with two ends of the first supporting arm 3, the other end of each of the two connecting arms 2 is fixedly connected with the two frame arms 1, the second supporting arm 4, the third supporting arm 5 and the fourth supporting arm 6 are sequentially arranged on the inner sides of the two frame arms 1, and the second supporting arm 4, the third supporting arm 5 and the fourth supporting arm 6 are arranged at equal intervals;
it should be noted that, as can be seen from fig. 2, when the frame arm 1, the connecting arm 2 and the supporting arm are connected, they are all locked by the connection relationship of the bolt and the threaded hole, and when locked, the torsion is consistent;
the material selection module is used for selecting materials and thicknesses of the radar rotating arm structure;
in a specific embodiment, the process of material selection by the material selection module comprises the following processes:
the material selection module marks the product with numbers according to the type of the material
Wherein i is a positive integer, and i =1,2 … … n; n is the total number of material types; respectively obtaining material attributes of different materials, respectively marking the material attributes as Sij, wherein j represents the serial number of the material attributes, and j =1,2,3 and 4; corresponding Si1 represents the elastic modulus of material number i, Si2 represents the density of material number i, Si3 represents the poisson's ratio of material number i, and Si4 represents the yield strength of material number i;
in a specific embodiment, the process of material selection by the material selection module comprises the following processes:
the material selection module divides the radar rotating arm into a plurality of groups of thicknesses according to the adjustable thickness range of the radar rotating arm, wherein the adjustable thickness range is subjected to range adjustment according to the structure of the radar, and the thicknesses of the plurality of groups of radar rotating arms are respectively marked as
Wherein l is the radar boom thickness number, and l =1,2, … …, m; m is the total number of the thickness numbers;
the material selection module inputs the selected material attributes and the corresponding radar rotating arm structures into the model establishment module, the model establishment module generates radar rotating arm models according to the received material attributes and the corresponding radar rotating arm structures, generates a plurality of groups of radar rotating arm models according to the thicknesses of the radar rotating arms set by the material selection module, and marks the plurality of groups of radar rotating arm models with different materials and different thicknesses as radar rotating arm analysis models; sending the radar rotating arm analysis model established by the model establishing module to a vibration analysis module;
the vibration analysis module is used for carrying out vibration analysis on the radar rotating arm analysis model established by the model establishing module, in the application, the analysis process of the vibration analysis module comprises two parts, the first part is a pre-analysis process, namely the process of establishing global coordinates, and the process of carrying out pre-analysis on the radar rotating arm analysis model by the vibration analysis module comprises the following steps:
a vibration analysis module selects a basic point, marks the direction perpendicular to the frame arm 1 as a Z axis, marks the direction parallel to the frame arm 1 as an X axis, and marks the vertical upward direction as a Y axis;
in a specific embodiment, the base point is selected to be on the plane of the frame arm 1 and located at the center of the connection position of the frame arm 1 with the third support arm 5 and the fourth support arm 6;
the second part is an analog simulation process: the process of the vibration analysis module for carrying out analog simulation on the radar rotating arm analysis model comprises the following steps:
the method comprises the following steps: the vibration analysis module sends a vibration starting signal to the load application module;
step two: after receiving the vibration starting signal, the load application module applies a load force to the radar rotating arm analysis model along the direction vertical to the frame arm 1; dividing according to standard grids;
wherein, it needs to be explained that the load force is a harmonic load with an amplitude of 10N, a frequency range of 0-210Hz and a frequency interval of 10 Hz;
step three: the vibration analysis module acquires the amplitude perpendicular to the direction of a frame arm 1 of the radar rotating arm analysis model and the frequency response amplitude of stress;
step four: the vibration analysis module sends the obtained amplitude perpendicular to the direction of the frame arm 1 of the radar rotating arm analysis model and the obtained frequency response amplitude of the stress to the decision making module;
the decision-making module is used for selecting the preferred material and the preferred thickness, and specifically, the process of selecting the preferred material and the preferred thickness by the decision-making module is as follows:
step S1: the decision making module combines the received amplitude perpendicular to the direction of the frame arm 1 of the radar rotating arm analysis model and the received frequency response amplitude of the stress with the pre-stressed mode analysis to obtain the resonance frequency and the maximum deformation of the radar rotating arm;
step S2: the decision making module sequentially acquires a secondary peak value in the frequency response of the Z-direction deformation and a secondary peak value in the frequency response of the Z-direction stress, and generates a statistical table by combining materials and thicknesses;
step S3: and the decision making module selects the preferred material and the preferred thickness according to a statistical table and designs the radar rotating arm structure with the corresponding material thickness.
The embodiment of the invention also provides a method for eliminating and analyzing the low-frequency vibration of the rotating arm of the slope monitoring radar. Referring to fig. 3, fig. 3 is a flowchart of a method for analyzing elimination of low-frequency vibration of a rotating arm of a slope monitoring radar according to an embodiment of the present invention.
As shown in fig. 3, a method for analyzing elimination of low-frequency vibration of a rotating arm of a slope monitoring radar comprises the following steps:
the material selection module selects materials and thicknesses of the radar rotating arm structure; sending the selected material and the thickness to a model building module;
the model building module builds a radar rotating arm analysis model according to the radar rotating arm structure, the selected material and the thickness;
the vibration analysis module establishes a global coordinate for the received radar rotating arm analysis model and sends a vibration starting signal to the load application module;
the load application module applies a load force to the radar rotating arm analysis model along a direction perpendicular to the frame arm 1;
the vibration analysis module acquires the amplitude perpendicular to the direction of a frame arm 1 of the radar rotating arm analysis model and the frequency response amplitude of stress; and sending the data to a decision making module;
the decision making module sequentially acquires a secondary peak value in the frequency response of the Z-direction deformation and a secondary peak value in the frequency response of the Z-direction stress, and generates a statistical table by combining materials and thicknesses;
and the decision making module selects the preferred material and the preferred thickness according to a statistical table and designs the radar rotating arm structure with the corresponding material thickness.
The above formulas are all calculated by removing dimensions and taking numerical values thereof, the formula is a formula which is obtained by acquiring a large amount of data and performing software simulation to obtain the closest real situation, and the preset parameters and the preset threshold value in the formula are set by the technical personnel in the field according to the actual situation or obtained by simulating a large amount of data.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (2)
1. A side slope monitoring radar rotating arm low-frequency vibration elimination analysis system is characterized by comprising a radar rotating arm structure, a material selection module, a model establishing module, a load applying module, a vibration analysis module and a decision making module;
the material selection module is used for selecting materials and thicknesses of the radar rotating arm structure; the material selection module inputs the selected material attribute and the corresponding radar rotating arm structure into the model building module;
the model establishing module is used for establishing a radar rotating arm analysis model and sending the radar rotating arm analysis model to the vibration analysis module;
the vibration analysis module is used for carrying out vibration analysis on the radar rotating arm analysis model established by the model establishing module, and the vibration analysis module comprises global coordinate establishment and analog simulation; acquiring the amplitude perpendicular to the direction of a frame arm (1) of the radar rotating arm analysis model and the frequency response amplitude of stress;
the decision making module sequentially acquires a secondary peak value in the frequency response of Z-direction deformation and a secondary peak value in the frequency response of Z-direction stress, and generates a statistical table by combining materials and thicknesses;
the decision making module selects the preferred material and the preferred thickness according to the data statistical table, and designs the radar rotating arm structure with the corresponding material thickness;
the process of material selection by the material selection module comprises the following processes:
the material selection module marks the product with numbers according to the type of the material
Wherein i is a positive integer, and i =1,2 … … n; n is the total number of material types; respectively obtaining material attributes of different materials, respectively marking the material attributes as Sij, wherein j represents the serial number of the material attributes, and j =1,2,3 and 4; corresponding Si1 represents the elastic modulus of material number i, Si2 represents the density of material number i, Si3 represents the poisson's ratio of material number i, and Si4 represents the yield strength of material number i;
the material selection module divides the radar rotating arm into a plurality of groups of thicknesses according to the adjustable thickness range of the radar rotating arm, wherein the adjustable thickness range is subjected to range adjustment according to the structure of the radar, and the thicknesses of the plurality of groups of radar rotating arms are respectively marked as
Wherein l is the radar boom thickness number, and l =1,2, … …, m; m is the total number of the thickness numbers;
the material selection module inputs the selected material attributes and the corresponding radar rotating arm structures into the model establishment module, the model establishment module generates radar rotating arm models according to the received material attributes and the corresponding radar rotating arm structures, generates a plurality of groups of radar rotating arm models according to the thicknesses of the radar rotating arms set by the material selection module, and marks the plurality of groups of radar rotating arm models with different materials and different thicknesses as radar rotating arm analysis models;
the process of the vibration analysis module for establishing the global coordinate of the radar rotating arm analysis model comprises the following steps:
a vibration analysis module selects a basic point, the direction perpendicular to the frame arm (1) is marked as a Z axis, the direction parallel to the frame arm (1) is marked as an X axis, and the vertically upward direction is marked as a Y axis;
the base point is selected to be on the plane of the frame arm (1) and is positioned at the center of the connecting position of the frame arm (1) with the third supporting arm (5) and the fourth supporting arm (6);
the process of the vibration analysis module for carrying out analog simulation on the radar rotating arm analysis model comprises the following steps:
the method comprises the following steps: the vibration analysis module sends a vibration starting signal to the load application module;
step two: after receiving the vibration starting signal, the load application module applies a load force to the radar rotating arm analysis model along the direction vertical to the frame arm (1); and dividing according to standard grids;
step three: the vibration analysis module acquires the amplitude perpendicular to the direction of a frame arm (1) of the radar rotating arm analysis model and the frequency response amplitude of stress;
step four: the vibration analysis module sends the obtained amplitude perpendicular to the direction of the frame arm (1) of the radar rotating arm analysis model and the frequency response amplitude of the stress to the decision making module;
the load force is a harmonic load with an amplitude of 10N, a frequency range of 0-210Hz and a frequency interval of 10 Hz.
2. A slope monitoring radar rotating arm low-frequency vibration elimination analysis method is characterized by comprising the following steps:
the material selection module marks the product with numbers according to the type of the material
Wherein i is a positive integer, and i =1,2 … … n; n is the total number of material types; respectively obtaining material attributes of different materials, respectively marking the material attributes as Sij, wherein j represents the serial number of the material attributes, and j =1,2,3 and 4; corresponding Si1 represents the elastic modulus of material number i, Si2 represents the density of material number i, Si3 represents the poisson's ratio of material number i, and Si4 represents the yield strength of material number i;
the material selection module divides the radar rotating arm into a plurality of groups of thicknesses according to the adjustable thickness range of the radar rotating arm, wherein the adjustable thickness range is subjected to range adjustment according to the structure of the radar, and the thicknesses of the plurality of groups of radar rotating arms are respectively marked as
Wherein l is the radar boom thickness number, and l =1,2, … …, m; m is the total number of the thickness numbers;
the material selection module inputs the selected material attributes and the corresponding radar rotating arm structures into the model establishment module, the model establishment module generates radar rotating arm models according to the received material attributes and the corresponding radar rotating arm structures, generates a plurality of groups of radar rotating arm models according to the thicknesses of the radar rotating arms set by the material selection module, and marks the plurality of groups of radar rotating arm models with different materials and different thicknesses as radar rotating arm analysis models;
the model building module builds a radar rotating arm analysis model according to the radar rotating arm structure, the selected material and the thickness;
a vibration analysis module selects a basic point, the direction perpendicular to the frame arm (1) is marked as a Z axis, the direction parallel to the frame arm (1) is marked as an X axis, and the vertically upward direction is marked as a Y axis;
the base point is selected to be on the plane of the frame arm (1) and is positioned at the center of the connecting position of the frame arm (1) with the third supporting arm (5) and the fourth supporting arm (6);
the process of the vibration analysis module for carrying out analog simulation on the radar rotating arm analysis model comprises the following steps:
the method comprises the following steps: the vibration analysis module sends a vibration starting signal to the load application module;
step two: after receiving the vibration starting signal, the load application module applies a load force to the radar rotating arm analysis model along the direction vertical to the frame arm (1); and dividing according to standard grids;
step three: the vibration analysis module acquires the amplitude perpendicular to the direction of a frame arm (1) of the radar rotating arm analysis model and the frequency response amplitude of stress;
step four: the vibration analysis module sends the obtained amplitude perpendicular to the direction of the frame arm (1) of the radar rotating arm analysis model and the frequency response amplitude of the stress to the decision making module;
wherein, the load force is a harmonic load with an amplitude of 10N, a frequency range of 0-210Hz and a frequency interval of 10 Hz;
the vibration analysis module acquires the amplitude perpendicular to the direction of a frame arm (1) of the radar rotating arm analysis model and the frequency response amplitude of stress; and sending the data to a decision making module;
the decision making module sequentially acquires a secondary peak value in the frequency response of the Z-direction deformation and a secondary peak value in the frequency response of the Z-direction stress, and generates a statistical table by combining materials and thicknesses;
and the decision making module selects the preferred material and the preferred thickness according to a statistical table and designs the radar rotating arm structure with the corresponding material thickness.
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