A method for optimizing design of a plant structure against micro-vibration
By measuring the environmental acceleration response of the factory building and optimizing the cross-sectional dimensions of beams, slabs, and columns using finite element models, the problem of lacking systematic theory in factory building structural design was solved, achieving efficient and economical anti-micro-vibration design and avoiding resonance phenomena.
Patent Information
- Application Number
- CN202411832277.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2044-12-12
AI Technical Summary
Existing technologies lack systematic theories and methods for anti-micro-vibration design of factory structures, leading to reliance on foreign consulting firms, increased project costs and insufficient economic efficiency. Furthermore, existing designs tend to be conservative, resulting in large component sizes.
By measuring the acceleration response of the factory environment, performing frequency domain analysis, establishing a finite element model, and iteratively optimizing the cross-sectional dimensions of beams, slabs, and columns, resonance can be avoided, and the requirements for preventing micro-vibrations can be met while improving economic efficiency.
The system achieved optimized design for anti-micro-vibration of the factory building structure, which improved design efficiency and economy, avoided resonance, and reduced component size while meeting the anti-micro-vibration requirements.
Smart Images
Figure CN119885336B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of anti-micro-vibration technology for civil engineering structures, and specifically relates to an optimized design method for anti-micro-vibration of factory building structures. Background Technology
[0002] With the development of the times, modern high-tech products, especially electronic products such as chips and panels, have increasingly higher requirements for the precision of production and processing. The equipment used to produce these products often requires micron or even nanometer-level precision. Under such conditions, even minute vibrations from the environment can have a significant impact on the equipment, potentially affecting its normal operation, reducing its lifespan, impacting product processing accuracy, and leading to a decrease in product yield. Therefore, for production plants of such products, anti-vibration design is of paramount importance and is a crucial consideration in plant design and planning.
[0003] In the design of factory buildings to prevent fretting vibrations, optimizing the structural design to improve the structure's inherent resistance to fretting vibrations often eliminates the need for any additional subsystems, offering significant economic advantages and making it the preferred solution for fretting vibration prevention. However, research on structural fretting vibration prevention design in my country is relatively recent, and related technologies are still immature, mainly facing the following problems:
[0004] 1) Lack of systematic theories and methods for anti-micro-vibration design;
[0005] 2) The relevant technologies are not mature enough, which means that the design and planning of many engineering projects have to rely on foreign consulting agencies, resulting in high project design costs;
[0006] 3) Current factory building structural designs tend to be conservative, resulting in structural components that are often large in size, and the economic efficiency of factory building construction needs to be improved.
[0007] With the development of my country's electronics technology industry, the demand for related industrial plants is constantly increasing, and higher requirements are being placed on the anti-vibration capabilities of these plants. Therefore, the optimized design of anti-vibration structures for plants is of great significance for improving the economic efficiency of plant construction projects, strengthening the technical level of plant structure design in my country, and promoting the development of my country's high-tech industries. Summary of the Invention
[0008] To address the problems existing in the prior art, this invention provides a method for optimizing the design of factory building structures to prevent micro-vibration. This method comprehensively considers the coupling effect of components such as beams, slabs, and columns in the structure and their influence on the micro-vibration response. It systematically and efficiently performs iterative optimization design of the factory building structure, so that the design results meet the requirements for preventing micro-vibration while also having good economic efficiency.
[0009] The present invention proposes a method for optimizing the design of factory building structures to prevent micro-vibrations, comprising the following steps:
[0010] Step 1: Measure the acceleration response of the external environment of the proposed factory building and perform frequency domain analysis;
[0011] Step 2: Arrange the factory structure according to the building requirements and vibration damping level requirements;
[0012] Step 3: Establish a finite element model of the factory structure, use the measured environmental acceleration response as the input excitation, and calculate the velocity response of each point of the structure using time history analysis.
[0013] Step 4: Select representative points for the target number;
[0014] Step 5: Perform a 1 / 3 octave band analysis on the velocity response of the selected point, compare the velocity response in the horizontal direction with the micro-vibration response limit required by the design, adjust the cross-sectional dimensions of the columns of the factory building structure according to the comparison results, and recalculate the velocity response in the horizontal direction.
[0015] Step 6: Compare the vertical velocity response with the micro-vibration response limit required by the design, adjust the cross-sectional dimensions of the beams and slabs of the factory structure according to the comparison results, and recalculate the vertical velocity response;
[0016] Step 7: Determine whether the horizontal and vertical velocity responses both meet the design requirements for micro-vibration response limits. If not, return to step 5 until the design requirements are met.
[0017] Furthermore, in step 5, the step of comparing the horizontal velocity response with the design-required micro-vibration response limit and adjusting the cross-sectional dimensions of the columns in the factory building structure based on the comparison result includes:
[0018] Determine whether the horizontal velocity response meets the design requirements for the micro-vibration response limit:
[0019] If not, increase the column cross-section size;
[0020] If so, and the value is below the preset limit, then the column cross-section size will be reduced.
[0021] Furthermore, in step 6, the step of comparing the vertical velocity response with the design-required micro-vibration response limit and adjusting the cross-sectional dimensions of the beams and slabs of the factory building structure based on the comparison result includes:
[0022] Determine whether the vertical velocity response meets the design requirements for the micro-vibration response limit:
[0023] If not, increase the cross-sectional dimensions of the beams and slabs at the points exceeding the limits;
[0024] If so, and the ratio is lower than the preset limit, then the cross-sectional dimensions of the beams and slabs will be reduced.
[0025] Furthermore, in step 6, the target ratio of plate thickness to beam height is 1 / 2 to 1 / 1; when the vertical velocity response does not meet the micro-vibration response limit required by the design, the plate thickness is increased.
[0026] Increasing the plate thickness can more effectively control structural micro-vibrations and ensure the rationality of beam and plate dimensions.
[0027] Furthermore, in step 6, the target ratio of the beam cross-section width to height is 1 / 4 to 1 / 2.
[0028] Furthermore, in step 6, when adjusting the cross-sectional dimensions of the beams and slabs of the factory building structure, if the maximum velocity response at the selected point at 1 / 3 octave band increases after increasing the cross-sectional dimensions of the beams and slabs, then the cross-sectional dimensions of the beams are adjusted, and the velocity response is analyzed to see if it can be reduced. If it can be reduced, then this is used as the cross-sectional dimensions of the beams for further analysis.
[0029] If the maximum response increases after increasing the cross-sectional dimensions of beams and slabs, it indicates that resonance may exist. By adjusting the cross-sectional dimensions of the beams, the structure can better avoid the resonance range of environmental excitation, thereby improving the economic efficiency of the structure.
[0030] Furthermore, in the finite element analysis of step 3, the external excitation is input in the form of acceleration boundary conditions at the bottom of the vertical components of the factory building structure.
[0031] Compared with existing methods such as the large mass method and the large stiffness method, the calculation results of this method can better reflect the micro-vibration response of the actual structure and can avoid ill-conditioning and stability problems in numerical calculation.
[0032] Furthermore, the vertical components include columns and shear walls of the factory building structure.
[0033] Further, step 1 includes: measuring the horizontal and vertical acceleration response of the environment at the proposed factory site using an accelerometer, with a sampling frequency of not less than 160Hz, and performing frequency domain analysis on the collected data.
[0034] Compared to displacement and velocity, the acceleration response of environmental excitations is easier to measure and has higher measurement accuracy. Since the main frequency range of environmental excitations is between 0 and 80 Hz, the sampling frequency should not be lower than 160 Hz to ensure that the frequency domain analysis results can cover a sufficient frequency range.
[0035] Furthermore, in step 3, the measuring points used for measuring the excitation cover the area around the proposed factory site and encompass multiple operating conditions in the environmental vibration. Each measuring point records two orthogonal horizontal and vertical excitations, and the excitation with the most unfavorable spectral characteristics is selected as the input excitation.
[0036] Since the structural optimization design process involves considering both horizontal and vertical responses, the environmental excitation measured by this method can make the calculation results more reliable and closer to reality.
[0037] The beneficial effects of this invention are:
[0038] 1) A relatively systematic method for optimizing the design of factory building structures to prevent micro-vibration was proposed.
[0039] 2) The structural optimization design takes into account components such as beams, slabs, and columns, which enables a more comprehensive optimization of the structure and thus improves the economic efficiency of the structure.
[0040] 3) By taking into account the influence characteristics of different types of components on the micro-vibration response of the structure, the iterative design speed is often faster, which improves the design efficiency.
[0041] 4) Considering the structural resonance phenomenon caused by environmental excitation, the structure can better avoid the resonance range of environmental excitation, which is conducive to improving the economy of the structure. Attached Figure Description
[0042] Figure 1 This is a flowchart of the present invention.
[0043] Figure 2 This refers to the time history response data of vibration acceleration in an electronic factory environment obtained by the method of this invention.
[0044] Figure 3 This is the frequency domain amplitude spectrum of the vibration acceleration in an electronic factory environment obtained by the method of the present invention.
[0045] Figure 4 A three-dimensional diagram of the finite element model of the factory structure established by the method of the present invention.
[0046] Figure 5 This is a schematic diagram showing the planar positions of selected points P1 and P2 within the electronic factory building according to the method of the present invention.
[0047] Figure 6 This is a 1 / 3 octave band velocity response amplitude diagram of point P1 obtained by finite element simulation of the method of the present invention.
[0048] Figure 7 This is a 1 / 3 octave band velocity response amplitude diagram of point P2 obtained by finite element simulation of the method of the present invention. Detailed Implementation
[0049] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments:
[0050] This embodiment uses an electronics factory project in Shanghai as an example to illustrate the specific implementation of the present invention.
[0051] like Figure 1 As shown, the steps of the optimized design method for preventing fretting vibrations in factory structures are as follows:
[0052] Step (1): Measure the acceleration response of the environment at the proposed factory site and perform frequency domain analysis.
[0053] Horizontal and vertical acceleration responses were measured at the proposed factory site using accelerometers. The data acquisition instrument used sampled at a frequency of 200Hz, and measurements were taken at multiple locations around the proposed site. The final selected environmental acceleration time-history response data is as follows: Figure 2 As shown, the X and Y directions correspond to the two horizontal directions, and the Z direction corresponds to the vertical direction. A Fourier transform is performed on the collected data to obtain the acceleration amplitude spectrum of the environmental excitation, as shown below. Figure 3 As shown.
[0054] Step (2): Arrange the structure according to the building requirements and the level of vibration prevention.
[0055] The main structure of the factory building consists of three floors. The vibration damping standards are based on the internationally recognized VC (Vibration Criteria) standard. Certain areas on the first and second floors meet the VC-B standard, while the main part of the third floor is a clean production area, requiring a VC-D standard. Since this clean production area is the core of the vibration damping design, subsequent optimization design will focus on this area. Due to the high vibration damping requirements in this area, dense columns were installed beneath it to improve floor stiffness. The dimensions of the main structural components in this area are shown in Table 1. The corresponding VC-D standard requires a velocity response of no more than 6.25 μm / s in the 1 / 3 octave band range of 1–80 Hz.
[0056] Table 1. Structural Dimensions of Main Components in the Clean Production Area
[0057] Component type plate Liang column Cross-sectional dimensions 650mm 350mm×800mm 700mm×700mm
[0058] Step (3): Establish a finite element model of the factory structure using ABAQUS software. Input the environmental acceleration response measured in step (1) into the factory structure as an excitation, and calculate the velocity response at each point of the structure through time history analysis. The established finite element model of the factory structure is shown below. Figure 4 As shown, the acceleration excitation is input in the form of acceleration boundary conditions for the bottom nodes of vertical members such as columns and shear walls.
[0059] Step (4): Based on the calculated velocity response, select a certain number of representative points as analysis points. The following description uses two points P1 and P2 within the clean production area as an example. The locations of P1 and P2 are as follows: Figure 5 As shown.
[0060] Step (5): Perform a 1 / 3 octave band analysis on the velocity responses of P1 and P2 to determine whether the horizontal velocity response meets the design requirements for the micro-vibration response limit. If it does not meet the requirements, increase the column cross-section size. If it meets the requirements and is below 70% of the limit, appropriately reduce the column cross-section size to keep it within the limit range, and then recalculate. For the structure shown in Table 1, the 1 / 3 octave band amplitudes of the velocity responses at points P1 and P2 are as follows: Figure 6 and Figure 7 As shown in Table 2, by changing the column cross-sectional dimensions, the maximum values of the 1 / 3 octave band velocity response in the horizontal direction for P1 and P2 are obtained. Based on the above results, a column cross-sectional dimension of 550mm × 550mm is selected for subsequent analysis.
[0061] Table 2. Maximum octave band velocity response (μm / s) of P1 and P2 for different column sizes.
[0062]
[0063] Step (6): Determine whether the vertical velocity response at the selected point meets the micro-vibration response limit required by the design. If not, increase the cross-sectional dimensions of the beam and slab at the point exceeding the limit. If the requirement is met and the response is less than 80% of the limit, appropriately reduce the cross-sectional dimensions of the beam and slab, and then recalculate until the structure is in the optimal state. By changing the cross-sectional dimensions of the beam and slab respectively, the maximum values of the 1 / 3 octave band velocity response in the vertical direction of P1 and P2 are shown in Table 3. Based on the analysis results, the cross-sectional dimensions of the beam are taken as 250×800, and the thickness of the slab is 600mm.
[0064] Table 3. Maximum octave band velocity response (μm / s) of P1 and P2 under different beam and slab cross-sectional dimensions.
[0065]
[0066] Step (7): Analyze the optimized structure again to check if the response at each point exceeds the limit. At this point, the velocity response at each point meets the requirements of the VC standard. The final column cross-section dimensions are determined to be 550mm×550mm, the beam cross-section dimensions to be 250mm×800mm, and the slab thickness to be 600mm. Through the above optimization design, not only can the structure meet the requirements for preventing micro-vibrations, but the dimensions of the beams, columns, and slabs are also more economical.
[0067] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.
Claims
1. A method for optimizing the design of a factory building structure to prevent micro-vibrations, characterized in that, Includes the following steps: Step 1: Measure the acceleration response of the external environment of the proposed factory building and perform frequency domain analysis; Step 2: Arrange the factory structure according to the building requirements and vibration damping level requirements; Step 3: Establish a finite element model of the factory structure, use the measured environmental acceleration response as the input excitation, and calculate the velocity response of each point of the structure using time history analysis. Step 4: Select representative points for the target number; Step 5: Perform a 1 / 3 octave band analysis on the velocity response of the selected point, compare the velocity response in the horizontal direction with the micro-vibration response limit required by the design, adjust the cross-sectional dimensions of the columns of the factory building structure according to the comparison results, and recalculate the velocity response in the horizontal direction. Step 6: Compare the vertical velocity response with the micro-vibration response limit required by the design, adjust the cross-sectional dimensions of the beams and slabs of the factory structure according to the comparison results, and recalculate the vertical velocity response; Step 7: Determine whether the horizontal and vertical velocity responses both meet the design requirements for the micro-vibration response limits. If not, return to step 5 until the design requirements are met. Step 6, which involves comparing the vertical velocity response with the micro-vibration response limit required by the design, and adjusting the cross-sectional dimensions of the beams and slabs of the factory building structure based on the comparison results, includes the following steps: Determine whether the vertical velocity response meets the design requirements for the micro-vibration response limit: If not, increase the cross-sectional dimensions of the beams and slabs at the points exceeding the limits; If so, and the ratio is lower than the preset limit, then reduce the cross-sectional dimensions of the beams and slabs; In step 6, when adjusting the cross-sectional dimensions of the beams and slabs of the factory building structure, if the maximum velocity response at the selected point at 1 / 3 octave band increases after increasing the cross-sectional dimensions of the beams and slabs, then the cross-sectional dimensions of the beams are adjusted, and the velocity response is analyzed to see if it can be reduced. If it can be reduced, then this is used as the cross-sectional dimensions of the beams for further analysis.
2. The method for optimizing the design of a factory building structure to prevent micro-vibration according to claim 1, characterized in that, Step 5, which involves comparing the horizontal velocity response with the design-required micro-vibration response limit and adjusting the column cross-sectional dimensions of the factory building structure based on the comparison result, includes: Determine whether the horizontal velocity response meets the design requirements for the micro-vibration response limit: If not, increase the column cross-section size; If so, and the value is below the preset limit, then the column cross-section size will be reduced.
3. The method for optimizing the design of a factory building structure to prevent micro-vibration according to claim 1, characterized in that, In step 6, the target ratio of plate thickness to beam height is 1 / 2 to 1 / 1; when the vertical velocity response does not meet the micro-vibration response limit required by the design, the plate thickness is increased.
4. The method for optimizing the design of a factory building structure to prevent micro-vibration according to claim 3, characterized in that, In step 6, the target ratio of beam cross-section width to height is 1 / 4 to 1 / 2.
5. The method for optimizing the design of a factory building structure to prevent micro-vibration according to claim 1, characterized in that, In the finite element analysis in step 3, the external excitation is input in the form of acceleration boundary conditions at the bottom of the vertical components of the factory building structure.
6. The method for optimizing the design of a factory building structure to prevent micro-vibration according to claim 5, characterized in that, The vertical components include columns and shear walls of the factory building structure.
7. The method for optimizing the design of a factory building structure to prevent micro-vibration according to claim 1, characterized in that, Step 1 includes: measuring the horizontal and vertical acceleration responses of the environment at the proposed factory site using an accelerometer, with a sampling frequency of not less than 160Hz, and performing frequency domain analysis on the collected data.
8. The method for optimizing the design of a factory building structure to prevent micro-vibration according to claim 1, characterized in that, In step 3, the measuring points used for measuring the excitation cover the area around the proposed factory site and encompass multiple operating conditions in the environmental vibration. Each measuring point records two orthogonal horizontal and vertical excitations, and the excitation with the most unfavorable spectral characteristics is selected as the input excitation.