Rapid characterization method for physical defects on surface of electromagnetic model of complex target
By simplifying the physical damage model of complex target models, using only the cross-sectional shape dimension and the sweeping trajectory dimension, a complex target surface physical damage model was established, which solved the problem of rapid characterization of physical defects in complex target surfaces, and achieved simplification and rapid acquisition of surface physical damage defect parameters of complex target models.
Patent Information
- Application Number
- CN202510085511.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-05-09
AI Technical Summary
The prior art is difficult to quickly and efficiently characterize the effects of physical defects in complex target surfaces on their low detectable performance, especially in cases where actual measurement costs are high.
By simplifying the physical damage modeling of complex target models, using only the cross-sectional shape dimension and the swept trajectory dimension, a complex target surface physical damage model is established to achieve rapid characterization.
The simplification of the surface physical damage defect parameters of complex target models is achieved, and the rapid acquisition of scattering characteristic data of massive physical damage defects of different types and degrees is supported, solving the problem of inefficiency of traditional modeling methods.
Smart Images
Figure CN119962226A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a characterization method, in particular to a method for quickly characterizing physical defects on the surface of a complex target electromagnetic model, and belongs to the field of electromagnetic scattering characteristic modeling and simulation. Background Art
[0002] In daily use environments, low-scattering complex targets (such as low-observable aircraft) are often adversely affected by natural environmental factors and human factors, such as rain erosion, impact damage, electrostatic ablation, and human impact. These damages will cause structural damage to the surface of the complex target (mainly gaps, step differences, and impact damage), which will not only affect the mechanical strength of the structural components and flight safety, but may also cause electrical discontinuity on the target surface, resulting in changes in the electromagnetic scattering characteristics and reducing the low-detectability performance of the complex target. In order to study the impact of physical damage on the surface of complex targets on their low-detectability performance, it is necessary to use simulation methods to establish a method for obtaining the scattering characteristics of some damage types in the case of high actual measurement costs, and form a statistical mapping relationship between the apparent properties of the damage and the electromagnetic properties, as a low-observable aircraft or other low-observable target stealth design or the impact of physical damage defects on stealth performance in daily use of aircraft. Due to the natural random characteristics and uncertainty of physical damage in daily use of complex targets, in order to determine the impact of physical damage on the target surface on low detectability performance, it is necessary to simulate physical damage defects on the electromagnetic model of the complex target. However, since there are many parameters to truly characterize the physical damage defects on the target surface, it is impossible to use traditional modeling methods. It is urgent to find a simplified and fast method to establish the physical damage of the complex target model based on the sensitivity of the electromagnetic scattering characteristics of different characterization parameters of the physical damage defects, and to characterize the electromagnetic scattering characteristics of the actual physical damage defects. Summary of the invention
[0003] In view of the problems in the prior art, the present invention provides a method for quickly characterizing physical defects on the surface of a complex target electromagnetic model.
[0004] The purpose of the present invention can be achieved by the following technical solutions:
[0005] A method for rapidly characterizing physical defects on the surface of a complex target electromagnetic model is used for rapidly modeling and characterizing physical damage on the surface of a low-scattering complex target. The method comprises the following steps:
[0006] Step 1: Establish an electromagnetic model of the complex target according to its actual physical size;
[0007] Step 2: According to the physical damage defect to be characterized, the physical damage cross-sectional shape dimension is set on the complex target electromagnetic model, and the two-dimensional plane shape is constructed using the cross section to form the cross-sectional shape, and the cross-sectional shape is used as the plane dimension;
[0008] Step 3: Setting trajectory reference points, generating a static cross-sectional surface of a corresponding shape according to the shape parameters of the physical damage, and presetting multiple trajectory reference points on the static cross-sectional surface;
[0009] Step 4: Set the scanning trajectory dimension and scan multiple trajectory reference points to form a scanning trajectory line;
[0010] Step 5: Establish a physical damage model of the complex target surface through parametric characterization of the cross-sectional shape dimension and the scanning trajectory dimension.
[0011] Optionally, after the cross section is formed, it is parameterized to obtain cross-sectional shape parameters.
[0012] Optionally, each of the plurality of trajectory reference points is on a cross-sectional shape formed at its corresponding position.
[0013] Optionally, the process of sweeping a plurality of trajectory reference points to form a sweep trajectory line is as follows:
[0014] The sweeping trajectory direction is parameterized, and the tangent line between the plane where multiple trajectory reference points are located and the static cross-section surface is defined as the sweeping trajectory line using a parameter characterization algorithm.
[0015] Optionally, the process of establishing the complex target surface physical damage model is as follows:
[0016] The cross-sectional shape is moved along the scanning trajectory, and the three-dimensional shape formed by the movement and scanning of the cross-sectional shape is the physical damage model of the complex target surface.
[0017] Optionally, when the cross-sectional shape moves along the sweeping trajectory line, the trajectory reference point on the cross-sectional shape is always located on the sweeping trajectory line.
[0018] Beneficial effects of the present invention:
[0019] The conventional modeling parameter dimensions of physical damage defects in low-scattering complex target models are simplified into two dimensions: cross-section and direction control, namely the cross-sectional shape dimension and the scanning trajectory dimension. Through these two dimensions, the shape, depth, and type (gap, step difference, impact damage) of surface physical damage can be quickly modeled, and the parameters of physical damage defects on the surface of complex target models can be simplified. This supports the rapid acquisition of scattering characteristic data of massive physical damage defects of different types and degrees, and solves the problem of inefficiency of traditional modeling methods that use actual physical dimensions of damage. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.
[0021] Figure 1 A target surface trajectory line formed by a trajectory reference point in an implementation of the present invention.
[0022] Figure 2 This is a display diagram of the application of the first embodiment of the present invention to arbitrary plane shapes and spherical curved shapes.
[0023] Figure 3 Two trajectory lines and cross-sectional shapes are implemented for the present invention.
[0024] Figure 4 This is a simulation diagram of the direction of the trajectory reference points in the second embodiment of the present invention.
[0025] Figure 5 The target model is formed by moving and stretching the cross-sectional shape along the trajectory line in the second embodiment of the present invention. DETAILED DESCRIPTION
[0026] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0027] Implementation 1:
[0028] See also Figure 1-5 As shown, a method for quickly characterizing physical defects on the surface of a complex target electromagnetic model includes the following steps:
[0029] Step 1: Establish an electromagnetic model of the complex target based on its actual physical size.
[0030] Step 2: According to the physical damage defect to be characterized, the physical damage cross-sectional shape dimension is set on the complex target electromagnetic model, and the two-dimensional plane shape is constructed using the cross-section to form the cross-sectional shape, and the cross-sectional shape is used as the plane dimension; the cross-sectional shape can be divided into polygonal structural cross-sections such as triangles and quadrilaterals according to the number of boundaries, and the size of the cross-sectional shape, the internal angle, etc. can also be parameterized.
[0031] Step 3: Set the trajectory reference points, generate a static cross-sectional surface of the corresponding shape according to the shape parameters of the physical damage, and preset multiple trajectory reference points on the static cross-sectional surface. Each of the multiple trajectory reference points is on the cross-sectional shape formed at its corresponding position.
[0032] Taking the starting point O among multiple trajectory reference points as an example, point O is represented as a static three-dimensional coordinate on the static cross-sectional surface. Given the shape parameters of point O and physical damage, the cross-sectional shape and position at that moment are fixed.
[0033] Step 4: Set the scanning trajectory dimension and scan multiple trajectory reference points to form a scanning trajectory line;
[0034] The sweeping trajectory direction is parameterized, and the tangent line between the plane where multiple trajectory reference points are located and the static cross-section surface is defined as the sweeping trajectory line using a parameter characterization algorithm.
[0035] When facing an arbitrary target physical damage model, several trajectory reference point positions are set on the static cross-sectional surface corresponding to the target physical damage model. The parameter characterization algorithm fits the corresponding model surface trajectory line according to the projection of the spatial connection line of the two adjacent trajectory reference points actually set on the static cross-sectional surface. Its purpose is to fit the trajectories of these trajectory reference points and expand the trajectory reference point list on the static cross-sectional surface. The trajectory reference point list is the dynamic trajectory list of the cross-sectional shape trajectory reference point O. The trajectory reference point list contains the position and posture information of the trajectory reference point O, so that its spatial position is always maintained on the static cross-sectional surface of the model, so that the curvature change of the surface of the target physical damage model can be characterized.
[0036] as follows Figure 1 As shown in Figure 1, given several key trend trajectory reference points 2 to 9, the parameter characterization algorithm projects the line between two adjacent trajectory reference points onto the target surface and fits a list of several trajectory reference points to form a smooth trajectory line on the target surface, as follows Figure 1 The red, yellow, green, blue and purple curves.
[0037] This dimension is for parametric characterization of complex target shapes. The trajectory reference point list provided by this dimension dynamically expresses the position of the cross-sectional shape trajectory reference point O and the posture at the sampling time. Therefore, it can characterize the curvature information of the parametric surface of the selected target physical damage model, thereby controlling the spatial position of the physical damage to always slide along the surface. It can realize the generation of projection curves on regional surfaces and can be applied to arbitrary plane shapes and spherical curved shapes, such as the following Figure 2 shown.
[0038] Step 5: Establish a physical damage model for the complex target surface through parametric representation of the cross-sectional shape dimension and the scanning trajectory dimension. Move the cross-sectional shape along the scanning trajectory, and the three-dimensional shape formed by the movement and scanning of the cross-sectional shape is the physical damage model for the complex target surface.
[0039] When the cross-sectional shape moves along the sweeping trajectory line, the trajectory reference point on the cross-sectional shape is always located on the sweeping trajectory line.
[0040] Implementation 2:
[0041] According to any curve on the complex target surface, the key points (trajectory reference points) are simulated for division; at the same time, different cross-sectional shapes (whose shapes and sizes can be parameterized), postures and initial heading vectors can be designed. Because gaps and protrusions are complementary, for the convenience of description, the characterization is demonstrated here using protrusions as an example. In this case, the cross-sectional shape is a regular pentagon, the initial normal vector is the tangent vector of the starting point of the curve, the side length is set to 1mm, the center point is the starting point of the curve, the curve interval of 1mm is set as the key point, and the curve length is 12mm.
[0042] The details are as follows Figure 3 As shown;
[0043] According to the smooth curve formed by the broken line, the corresponding tangent direction (containing curvature information) of the curve is obtained at the key point (trajectory reference point). The direction of the tangent vector is the direction of the cross-sectional shape, as shown below Figure 4 shown.
[0044] Then, based on the above cross-sectional direction and cross-sectional shape, a tubular model is generated as follows Figure 5 shown.
[0045] Through the simple implementation of parametric modeling of standard bodies, the corresponding regular and irregular cross-sections can be parametrically represented, such as circles, rectangles, triangles, polygons, etc. The above method can be extended to the parametric representation of irregular random physical damage defects. According to the trend vector of the key points of the broken line, the parametric cross-section and the cross-section posture, the physical damage model of the specified direction can be obtained.
[0046] Specifically, after the cross section is formed, it is parameterized to obtain the cross section shape parameters.
[0047] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.
Claims
1. A method for rapid characterization of physical defects on the surface of a complex target electromagnetic model, characterized in that: The characterization method includes the following steps: Step 1: Establish an electromagnetic model of the complex target according to its actual physical size; Step 2: According to the physical damage defect to be characterized, the physical damage cross-sectional shape dimension is set on the complex target electromagnetic model, and the two-dimensional plane shape is constructed using the cross section to form the cross-sectional shape, and the cross-sectional shape is used as the plane dimension; Step 3: Setting trajectory reference points, generating a static cross-sectional surface of a corresponding shape according to the shape parameters of the physical damage, and presetting multiple trajectory reference points on the static cross-sectional surface; Step 4: Set the scanning trajectory dimension and scan multiple trajectory reference points to form a scanning trajectory line; Step 5: Establish a physical damage model of the complex target surface through parametric characterization of the cross-sectional shape dimension and the scanning trajectory dimension.
2. According to claim 1, a method for rapid characterization of physical defects on the surface of a complex target electromagnetic model is characterized in that: After the cross section is formed, it is parameterized to obtain the cross section shape parameters.
3. The method for rapid characterization of surface physical defects of a complex target electromagnetic model according to claim 1 is characterized in that: Each of the plurality of trajectory reference points is on a cross-sectional shape formed at its corresponding position.
4. The method for rapid characterization of surface physical defects of complex target electromagnetic models according to claim 1 is characterized in that: The process of sweeping multiple trajectory reference points to form a sweep trajectory line is as follows: The sweeping trajectory direction is parameterized, and the tangent line between the plane where multiple trajectory reference points are located and the static cross-section surface is defined as the sweeping trajectory line using a parameter characterization algorithm.
5. The method for rapid characterization of physical defects on the surface of a complex target electromagnetic model according to claim 1 is characterized in that: The process of establishing the complex target surface physical damage model is as follows: The cross-sectional shape is moved along the scanning trajectory, and the three-dimensional shape formed by the movement and scanning of the cross-sectional shape is the physical damage model of the complex target surface.
6. A method for rapid characterization of physical defects on the surface of a complex target electromagnetic model according to claim 5, characterized in that: When the cross-sectional shape moves along the sweeping trajectory line, the trajectory reference point on the cross-sectional shape is always located on the sweeping trajectory line.