A high-stiffness, high-damping common frame for vibration reduction of electromechanical equipment

Abstract

This invention discloses a high-stiffness, high-damping common frame for vibration reduction in electromechanical equipment, comprising: a frame body and a damping layer; the frame body is welded from multiple steel plates, including a main structural plate and an auxiliary structural plate; under preset dimensional and weight boundary conditions, the thickness distribution of the main and auxiliary structural plates is determined through global topology optimization and parameter optimization, with the optimization objective being to minimize the overall deformation of the frame; the damping layer, based on the vibration transmission path calculation results, is directionally laid on the frame body at corresponding high strain energy regions or vibration transmission nodes to achieve a synergistic design of high-stiffness load-bearing and high-damping vibration reduction. This common frame, through structural design and topology optimization, optimizes the structural distribution under fixed dimensional and weight boundary conditions, improves the overall stiffness of the common frame, and sets damping arrangement positions. By arranging damping materials, the high-stiffness, high-damping design of the common frame is achieved, resulting in vibration reduction and noise reduction.

Description

Technical Field

[0001] This invention relates to the field of mechanical and electrical equipment support and vibration reduction structure technology, and more specifically, to a high-rigidity, high-damping common frame structure for vibration reduction of mechanical and electrical equipment. Background Technology

[0002] The common frame is a core load-bearing component of electromechanical equipment such as steam turbine generators, large compressors, and heavy-duty pump sets. Existing common frames are typically assembled from steel plates of varying sizes using welding processes, such as... Figure 1 As shown, the design of structural components relies heavily on engineers' experience, and the dimensions and thickness distribution of sheet metal lack systematic quantitative control. Under strict dimensional and weight constraints, traditional designs fail to control the structural parameters of common rack components, resulting in materials that are too thick or too thin, failing to achieve rational material utilization and distribution. This leads to problems such as unreasonable stiffness design and short-circuiting in vibration transmission, which is detrimental to vibration transmission and hinders the effectiveness of damping materials. Furthermore, because damping is not designed for areas where vibration energy accumulates, even if damping materials are arbitrarily applied to traditional racks, they are unlikely to dissipate energy within the effective frequency band, resulting in extremely poor vibration reduction and noise reduction effects.

[0003] A search revealed the following relevant patent documents in the prior art:

[0004] 1. Patent document (CN103629297A) discloses a broadband dynamic damping vibration reduction device for equipment mounting bases, which achieves broadband vibration reduction by setting a multi-stage subsystem of "mass-spring-damping" within the base support beam. The technical problem with this patent is that it focuses on adding an independent damping subsystem within existing beam components, without topological optimization of the plate thickness distribution from a global frame perspective. In large welded plate frames, the introduction of internal subsystems significantly increases structural complexity, assembly difficulty, and manufacturing costs, and fails to resolve the contradiction between the overall frame stiffness and weight boundary conditions. Furthermore, its damping mechanism mainly relies on subsystem resonance, which has limited effectiveness in suppressing low-frequency bending / torsional modal vibrations caused by uneven stiffness distribution within the frame structure itself.

[0005] 2. Patent document (CN201277422Y) discloses a high-damping vibration-absorbing platform structure, which adopts a frame structure with internal damping material and an upper cover plate. It is mainly used as a lightweight load-bearing platform for precision optical or semiconductor equipment. The technical problems of this patent are: its overall lightweight modular design of "frame + filling" has limited structural load-bearing capacity and is not suitable for large electromechanical equipment that bears heavy loads and high impacts; moreover, its damping material is uniformly filled throughout and is not precisely oriented in conjunction with the vibration transmission path of the large welded frame, which cannot effectively cut off the vibration short-circuit path in the heavy frame, making it difficult to achieve high damping and high stiffness in heavy working conditions.

[0006] In summary, existing technologies lack a common frame structure that can simultaneously achieve high stiffness load-bearing capacity and efficient broadband vibration reduction by globally optimizing structural parameters under strict dimensional and weight constraints and precisely arranging damping materials based on the vibration transmission path. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a high-stiffness, high-damping common rack for vibration reduction in electromechanical equipment. This rack achieves a reasonable distribution of plate thickness through topology optimization and parameter optimization, maximizing the overall stiffness of the rack under weight boundary conditions. Simultaneously, based on vibration transmission path calculation results, damping material is directionally laid to effectively attenuate vibration energy transmission, solving the problems of unreasonable material distribution, vibration short-circuiting, and damping failure in traditional racks.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A high-stiffness, high-damping electromechanical equipment vibration reduction common frame includes: a frame body and a damping layer; the frame body is welded from multiple steel plates, and includes a main structural plate and an auxiliary structural plate; under preset dimensional and weight boundary conditions, the thickness distribution of the main structural plate and the auxiliary structural plate is determined through global topology optimization and parameter optimization, with the optimization objective being to minimize the overall deformation of the frame; the damping layer is oriented and laid on the frame body at corresponding high strain energy regions or vibration transmission nodes based on the frame vibration transmission path calculation results, so as to achieve a synergistic design of high-stiffness load-bearing and high-damping vibration reduction of the frame.

[0009] Furthermore, the thickness of the main structural plate is optimized to be in the range of 30mm to 50mm, and the thickness of the auxiliary structural plate is optimized to be in the range of 10mm to 20mm.

[0010] Furthermore, the global topology optimization and parameter optimization specifically involves: using the thickness of the main structural plate and the auxiliary structural plate as design variables, taking the total weight of the frame not exceeding the traditional design weight as a constraint, and taking the minimization of the maximum deformation and average deformation under static and dynamic load excitation as the objective function, iterative calculations are performed using finite element simulation tools to obtain the optimal thickness allocation combination.

[0011] Furthermore, the vibration transmission path calculation includes: performing modal analysis and frequency response analysis on the frame body, extracting strain energy distribution cloud maps and vibration acceleration transmissibility under each mode, and identifying regions with strain energy density ≥ preset thresholds or structural surfaces where transmissibility peaks as high strain energy regions or vibration transmission nodes.

[0012] Furthermore, the main structural plate constitutes the main load-bearing skeleton of the frame, and the auxiliary structural plate connects the adjacent main structural plate to form a closed or semi-closed reinforced cavity; the damping and vibration reduction layer is laid on the inner wall surface of the reinforced cavity or the overlapping transition area of ​​the main and auxiliary structural plates.

[0013] Furthermore, the common rack is suitable for steam turbine generator bases, large compressor racks, industrial pump set supports, or common platforms for installing heavy electromechanical equipment.

[0014] Furthermore, under the same weight boundary conditions, the maximum deformation of the frame is reduced by 10% to 20%, the average deformation is reduced by 8% to 15%, and the vibration transmissibility is attenuated by ≥3dB in the 10Hz to 1000Hz operating frequency band.

[0015] Compared with the prior art, the present invention has the following significant advantages: 1. Through the collaborative design of "global topology optimization for fixed thickness + transmission path calculation for fixed damping position", the system achieves maximum stiffness and precise damping energy dissipation under the same weight, breaking through the technical bottleneck of the difficulty in balancing stiffness and damping.

[0016] 2. Limit the process window for optimizing the main / auxiliary plates to ensure the optimal stiffness-to-weight ratio is obtained within the manufacturable range, avoiding material waste or structural weakness.

[0017] 3. By using the minimization of deformation as the objective function and combining it with finite element iteration, the design of structural parameters is transformed from "experience-based trial and error" to "data-driven", which significantly improves the reliability of the design.

[0018] 4. Based on the peak values ​​of strain energy and transmissibility, high-energy-consuming areas can be accurately located, allowing damping materials to be used effectively and significantly improving vibration reduction efficiency.

[0019] 5. Enclosed / semi-enclosed cavities enhance torsional stiffness, and the inner wall damping effectively suppresses airborne acoustic radiation and coupled vibration of the plate.

[0020] 6. It is clearly applicable to heavy-duty electromechanical equipment, verifying the engineering practical value of the structure under high load and strong excitation conditions.

[0021] 7. Under the boundary conditions of keeping the overall dimensions of the frame unchanged and the total weight basically constant, the deformation is significantly reduced and the vibration transmission rate is attenuated by ≥3dB.

[0022] In summary, the common rack of the present invention optimizes the structural distribution and improves the overall stiffness of the common rack under the condition of fixed size and weight through structural design and topology optimization. It also sets the damping arrangement position and realizes the high stiffness and high damping design of the common rack by arranging damping materials, thereby achieving the effect of vibration reduction and noise reduction. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the general structure of an existing traditional public rack; Figure 2 A schematic diagram of a common frame structure for vibration reduction of high-rigidity, high-damping electromechanical equipment provided by the present invention; Figure 3 A schematic diagram of design factors for common rack structural components (showing the external dimensions and thickness parameters of the main structural plate and auxiliary plates). Figure 4 To improve the vibration transmission characteristic curves of the front and rear common frame structure prototypes; Figure 5 A comparison diagram of deformation of the test specimens before and after the improvement of the common frame structure. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. These embodiments are only for explaining the present invention and are not intended to limit the scope of protection of the present invention.

[0025] like Figure 2 As shown, the high-rigidity, high-damping electromechanical equipment vibration reduction common frame structure of this embodiment mainly includes a frame body and a damping layer 3. The frame body is welded from steel plates and includes a main structural plate 1 and an auxiliary structural plate 2. The main structural plate 1 forms a load-bearing skeleton, the auxiliary structural plates 2 are connected to form a reinforcing cavity, and the damping layer 3 is laid on the inner wall of the cavity or in the overlapping transition area.

[0026] The high-rigidity frame is formed through structural design and topology optimization. The thicknesses of the main structural plate and auxiliary structural plate are set as optimization parameters, with the deformation minimization target within the allowable material thickness range of the process design (e.g., 30-50mm for the main structural plate and 10-20mm for the auxiliary plate). Parameter optimization is performed using finite element analysis to obtain the minimized deformation. Damping materials are then arranged based on excitation transmission path calculations to attenuate vibration transmission. This ultimately forms a high-rigidity, high-damping, vibration-reducing common frame.

[0027] In the initial design phase, the thickness of the main structural plate of the traditional prototype was set to 30mm, and the thickness of the auxiliary plate was set to 15mm. Under the boundary conditions of maintaining the overall dimensions of the frame and a relatively constant total weight, parametric topology optimization was performed using finite element tools such as ANSYS / ABAQUS. Based on... Figure 3The design factors shown use the thickness of the main and auxiliary plates as design variables (main plate range 30-50mm, auxiliary plate range 10-20mm), with the objective function being to minimize the maximum and average deformation of the frame under rated equipment load and dynamic excitation. After multiple rounds of iterative calculations, the optimal thickness distribution scheme was obtained: the main structural plate thickness was optimized to 35mm, and the auxiliary structural plate thickness was optimized to 12mm. This scheme significantly improves the overall bending and torsional stiffness without increasing weight through a "main-strong, auxiliary-tough" distribution strategy.

[0028] Vibration transmission path calculation includes: performing modal analysis and frequency response analysis on the frame body, extracting strain energy distribution cloud maps and vibration acceleration transmissibility under each mode, and identifying regions with strain energy density ≥ preset thresholds or structural surfaces where transmissibility peaks as high strain energy regions or vibration transmission nodes.

[0029] To evaluate the vibration reduction effect of the high-stiffness, high-damping common frame, the finite element method was used to calculate the vibration transmission of the structural prototype in the simulation. Sinusoidal excitations of various frequencies were applied to the structural prototype models before and after the improvement, and the vibration attenuation effect of the turbine generator frame was calculated.

[0030] like Figure 4 As shown, finite element simulation and physical vibration tests were performed on the samples before improvement (traditional 30 / 15mm thickness) and after improvement (optimized 35 / 12mm thickness + directional damping). The test method was as follows: a 10Hz to 1000Hz sweep frequency sinusoidal excitation was applied to the bottom feet of the frame, and the vibration acceleration response of the top equipment mounting surface was collected.

[0031] like Figure 5 As shown, the test results indicate that: (1) Under the same weight conditions, the maximum deformation of the improved frame is reduced by 10% to 20%, and the average deformation is reduced by 8% to 15%. This verifies the effect of topology optimization on stiffness distribution.

[0032] (2) In the operating frequency band of 10Hz to 1000Hz, the vibration transmissibility of the improved structure is reduced by ≥3dB. The directional laying of the damping layer enables the vibration energy to be efficiently dissipated in the transmission path.

[0033] This embodiment fully illustrates that by combining "plate thickness topology optimization under size / weight constraints" with "precise damping arrangement based on transmission path", the present invention successfully solves the technical problems of unreasonable material allocation, short-circuiting vibration transmission, and low damping utilization rate in traditional common racks, and achieves the organic unity of high stiffness load-bearing and high damping vibration reduction, which has significant industrial application value and patent stability.

[0034] Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this invention shall be included within the scope of protection of this invention.

Claims

1. A common frame for vibration reduction of high-rigidity, high-damping electromechanical equipment, characterized in that, include: The frame body and the damping and vibration reduction layer; the frame body is welded from multiple steel plates, and the frame body includes a main structural plate and an auxiliary structural plate; Under preset size and weight boundary conditions, the thickness distribution of the main structural plate and the auxiliary structural plate is determined through global topology optimization and parameter optimization, with the optimization objective being to minimize the overall deformation of the frame. The damping and vibration reduction layer is oriented and laid on the corresponding high strain energy area or vibration transmission node on the frame body based on the calculation results of the frame vibration transmission path, so as to achieve the coordinated design of high stiffness load bearing and high damping vibration reduction of the frame.

2. The high-stiffness, high-damping electromechanical equipment vibration reduction common frame according to claim 1, characterized in that, The thickness of the main structural plate is optimized to be between 30mm and 50mm, and the thickness of the auxiliary structural plate is optimized to be between 10mm and 20mm.

3. The high-stiffness, high-damping electromechanical equipment vibration reduction common frame according to claim 1 or 2, characterized in that, The global topology optimization and parameter optimization are specifically as follows: taking the thickness of the main structural plate and the auxiliary structural plate as design variables, taking the total weight of the frame not exceeding the traditional design weight as a constraint, taking the minimization of the maximum deformation and average deformation under static and dynamic load excitation as the objective function, and performing iterative calculations through finite element simulation tools to obtain the optimal thickness allocation combination.

4. The high-stiffness, high-damping electromechanical equipment vibration reduction common frame according to claim 1, characterized in that, The vibration transmission path calculation includes: performing modal analysis and frequency response analysis on the frame body, extracting strain energy distribution cloud maps and vibration acceleration transmissibility under each mode, and identifying regions with strain energy density ≥ preset thresholds or structural surfaces where transmissibility peaks as high strain energy regions or vibration transmission nodes.

5. The high-stiffness, high-damping electromechanical equipment vibration reduction common frame according to claim 1, characterized in that, The main structural plate constitutes the main load-bearing skeleton of the frame, and the auxiliary structural plate connects the adjacent main structural plate to form a closed or semi-closed reinforced cavity; the damping and vibration reduction layer is laid on the inner wall of the reinforced cavity or in the overlapping transition area of ​​the main and auxiliary structural plates.

6. The high-stiffness, high-damping electromechanical equipment vibration reduction common frame according to any one of claims 1-5, characterized in that, The common rack is suitable for steam turbine generator bases, large compressor racks, industrial pump set supports, or common platforms for installing heavy electromechanical equipment.

7. The high-stiffness, high-damping electromechanical equipment vibration reduction common frame according to any one of claims 1-5, characterized in that, Under the same weight boundary conditions, the maximum deformation of the frame is reduced by 10% to 20%, the average deformation is reduced by 8% to 15%, and the vibration transmissibility is reduced by ≥3dB in the 10Hz to 1000Hz operating frequency band.

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