CN-121980868-A - Method and device for expanding region of large-scale vibration propagation of foundation of large-scale power machine

CN121980868ACN 121980868 ACN121980868 ACN 121980868ACN-121980868-A

Abstract

The invention discloses a large-scale vibration propagation area expansion method and device for a large-scale power machine foundation, which comprises the steps of firstly establishing an initial finite element domain model of the large-scale power machine foundation and field soil with the foundation size of 2 times of the surrounding foundation size, then establishing a spectrum element area expansion model within the kilometer range of the surrounding of the large-scale power machine foundation, extracting surface node information parameters of a hollowed area, constructing a finite element domain expansion model of the large-scale power machine foundation and soil with the foundation size of 3 times of the surrounding, selecting a foundation stress surface of the finite element domain expansion model, extracting free field equivalent node forces of each surface of the soil with the foundation size of 2 times of the surrounding of the large-scale power machine foundation, and finally applying the free field equivalent node forces to the spectrum element area expansion model according to corresponding positions for analysis. According to the invention, the large-scale analysis model is decomposed into an internal fine finite element domain and an external spectrum element domain, and the large-scale vibration response under the basis of a large-scale complex machine can be obtained by combining the auxiliary solution domain of the external expansion of the internal finite element domain.

Inventors

FU ZHANYUAN
BA ZHENNING
HAN QINGHUA
LU YAN
LIANG JIANWEN

Assignees

天津大学

Dates

Publication Date: 20260505
Application Date: 20260128

Claims (5)

1. The region expansion method for large-scale vibration propagation of the foundation of the large-scale power machine is characterized by comprising the following steps of: according to basic design parameters of the large-scale power machine and parameters of the field soil around the basic, an initial finite element domain model of the large-scale power machine basic and the field soil around the large-scale power machine basic with 2 times of basic size is built; according to the land parameters around the foundation of the large-scale power machine, establishing a spectrum element region expansion model in a kilometer level range around the foundation of the large-scale power machine, hollowing out a corresponding region of the initial finite element region model, and extracting surface node information parameters of the hollowing out region; Expanding the initial finite element domain model by 1 time of a basic size soil body, and constructing a finite element domain expansion model of a large power machine foundation and surrounding 3 times of the basic size soil body; Based on the basic stress characteristics of the large-scale power machine, selecting a basic stress surface of a finite element domain expansion model, applying equivalent concentrated or uniform load under the action of the power machine, and extracting the free field equivalent node force of each surface of a soil body with 2 times of basic size around the large-scale power machine foundation; And (3) based on the surface node information parameters of the hollowed-out area, applying a spectrum element area expansion model to the free field equivalent node force according to the corresponding position for analysis.
2. The method for expanding the region of large-scale vibration propagation of a large-scale power machine foundation according to claim 1, wherein the process of establishing an initial finite element field model of the large-scale power machine foundation and the surrounding 2 times of foundation-size field soil comprises the steps of: establishing a basic model according to a basic design scheme of the large-scale power machine and determining material parameters; on the basis of a basic model of a large-scale power machine, selecting 2 times of basic size to determine the size of the field soil; according to the material parameters, a large-scale site soil model with 2 times of basic size is established; And determining the unit sizes of the basic model and the large-scale field soil model according to the precision requirement, performing grid division, selecting proper unit types and viscoelastic artificial boundaries, and establishing an initial finite element domain model of the large-scale power machine foundation and the field soil with the surrounding 2 times of the basic size.
3. The method for expanding the region of large-scale vibration propagation of a large-scale power machine foundation according to claim 1, wherein the process of constructing a finite element domain expansion model of the large-scale power machine foundation and a soil mass with the size of 3 times of the foundation size around the large-scale power machine foundation and extracting surface node information parameters of the hollowed-out region comprises the following steps: determining the size of the large-scale field soil according to actual analysis requirements, determining material parameters according to the results of a soil investigation and an indoor geotechnical test, and establishing a large-scale field soil model; Digging a foundation corresponding to an initial finite element domain model in a large-scale site soil model and a soil area with the size of 2 times of the foundation in the surrounding, and extracting node information parameters on the surface of the digging area; determining the unit size of the large-scale field soil model according to the precision requirement, performing grid division, selecting proper unit types and viscoelastic artificial boundaries, and establishing a spectrum element region expansion model of the large-scale field.
4. The method for expanding the region of large-scale vibration propagation of a large-scale power machine foundation according to claim 1, wherein the process for constructing the finite element domain expansion model of the large-scale power machine foundation and the soil mass with the size of 3 times of the foundation size comprises the following steps: establishing a basic model according to a basic design scheme of the large-scale power machine and determining material parameters; on the basis of a basic model of a large-scale power machine, selecting a basic size which is 3 times that of the basic model to determine the size of the field soil; According to the material parameters, a large-scale site soil model with the basic size of 3 times is established; determining the unit sizes of a basic model and a large-scale field soil model according to the precision requirement, performing grid division, selecting proper unit types and viscoelastic artificial boundaries, and establishing a finite element domain expansion model of a large-scale power machine foundation and surrounding field soil with the 3 times of the basic size.
5. The utility model provides a region expansion device of large-scale vibration propagation of large-scale power machine basis which characterized in that, the device includes: The finite element model construction unit is used for constructing an initial finite element domain model of the large-scale power machine foundation and the surrounding field soil with the 2 times of the foundation size according to the foundation design parameters of the large-scale power machine and the foundation surrounding field soil parameters; The spectrum element model construction unit is used for establishing a spectrum element region expansion model in a kilometer level range around a large-scale power machine foundation according to the field soil parameters around the large-scale power machine foundation, hollowing out a corresponding region of the initial finite element region model and extracting surface node information parameters of the hollowing out region; the model extension unit is used for externally extending the initial finite element domain model by 1 time of a basic size soil body and constructing a finite element domain extension model of a large power machine foundation and surrounding 3 times of basic size soil bodies; The simulation unit selects a basic stress surface of the finite element domain expansion model based on basic stress characteristics of the large-scale power machine, applies equivalent concentrated or uniform load under the action of the power machine, and extracts free field equivalent node forces of each surface of a soil body with 2 times of basic size around the foundation of the large-scale power machine; And the data analysis unit is used for applying a spectrum element region expansion model according to the corresponding position to analyze the equivalent node force of the free field based on the surface node information parameters of the hollowed region.

Description

Method and device for expanding region of large-scale vibration propagation of foundation of large-scale power machine Technical Field The invention relates to the field of large-scale power machine foundation vibration analysis, in particular to a large-scale power machine foundation vibration propagation area expanding method and device. Background Along with the development of technology and the requirements of engineering construction, large power machine equipment with large working counter force, wide frequency range and high space requirement (huge equipment composition) is continuously emerging. Under the action of working load, the machine foundation and the surrounding large-scale (kilometer range) field can generate excessive vibration, thereby influencing the working precision of the machine, reducing the comfort level of human bodies and even threatening the safety of building structures. At present, vibration propagation analysis of a large-scale power machine foundation is often limited to a machine foundation and a place in the range of hundreds of meters around the machine foundation, and the degree of influence of vibration of each point of a large-scale (kilometer-scale range) place is less researched. Meanwhile, conventional numerical analysis generally adopts finite elements to establish an overall refined foundation-site numerical analysis model, even if a limited calculation region is intercepted by a manual boundary, the spatial scale of the overall model is still larger, high-performance calculation resources are generally required when higher precision and finer simulation are pursued, and complicated algorithms and parallelization technologies are possibly involved, so that the large-scale site vibration attenuation condition cannot be well analyzed. Thus, there is a need to provide a reliable large scale vibration influence numerical analysis framework to accommodate the need for large scale power machine based large scale vibration influence studies. Disclosure of Invention In view of the above, the invention provides a method and a device for expanding the region of large-scale vibration propagation of a large-scale power machine foundation, which are used for solving the problem that the vibration propagation analysis method of the existing large-scale power machine foundation cannot explore the vibration attenuation of a large-scale site. In order to achieve the above object, the following schemes are proposed: The region expansion method for large-scale vibration propagation of the foundation of the large-scale power machine comprises the following steps: according to basic design parameters of the large-scale power machine and parameters of the field soil around the basic, an initial finite element domain model of the large-scale power machine basic and the field soil around the large-scale power machine basic with 2 times of basic size is built; according to the land parameters around the foundation of the large-scale power machine, establishing a spectrum element region expansion model in a kilometer level range around the foundation of the large-scale power machine, hollowing out a corresponding region of the initial finite element region model, and extracting surface node information parameters of the hollowing out region; Expanding the initial finite element domain model by 1 time of a basic size soil body, and constructing a finite element domain expansion model of a large power machine foundation and surrounding 3 times of the basic size soil body; Based on the basic stress characteristics of the large-scale power machine, selecting a basic stress surface of a finite element domain expansion model, applying equivalent concentrated or uniform load under the action of the power machine, and extracting the free field equivalent node force of each surface of a soil body with 2 times of basic size around the large-scale power machine foundation; And (3) based on the surface node information parameters of the hollowed-out area, applying a spectrum element area expansion model to the free field equivalent node force according to the corresponding position for analysis. Preferably, the process of establishing an initial finite element field model of a large power machine foundation and surrounding 2 times the foundation size field earth comprises: establishing a basic model according to a basic design scheme of the large-scale power machine and determining material parameters; on the basis of a basic model of a large-scale power machine, selecting 2 times of basic size to determine the size of the field soil; according to the material parameters, a large-scale site soil model with 2 times of basic size is established; And determining the unit sizes of the basic model and the large-scale field soil model according to the precision requirement, performing grid division, selecting proper unit types and viscoelastic artificial boundaries, and establishing an initial finite eleme