A design method for unreinforced 3D-printed concrete landscape chairs and related products

Abstract

This application discloses a design method and related products for an unreinforced 3D-printed concrete landscape chair, relating to the field of 3D-printed concrete landscape furniture design technology. The method includes: determining an initial landscape chair model; constructing human body models of the target population for the landscape chair, and then constructing several human body sitting posture models; then establishing the contact relationship between each human body sitting posture model and the initial landscape chair model, determining the forces acting on each part of each human body sitting posture model within the initial landscape chair model, and obtaining a load dataset; calculating the load uniformity coefficient based on the load dataset, and making local adjustments to the initial landscape chair model accordingly, obtaining an adjusted landscape chair model; determining the extreme values ​​of tensile stress and compressive stress at each part of the adjusted landscape chair model after applying a standard load, and making shape adjustments to the adjusted landscape chair model accordingly, obtaining a design model for the unreinforced 3D-printed concrete landscape chair. This application can simultaneously guarantee comfort and load strength requirements.

Description

Technical Field

[0001] This application relates to the field of 3D printed concrete landscape furniture design technology, and in particular to a design method for an unreinforced 3D printed concrete landscape chair and related products. Background Technology

[0002] The application of 3D printed concrete technology in architecture and furniture design is rapidly expanding, and its high efficiency and modularity are revolutionizing traditional design and manufacturing processes. Compared to traditional cast concrete processes, 3D printed concrete technology offers greater modeling freedom, consumes less material, and causes less environmental pollution, which has led to its rapid development in recent years.

[0003] However, the material properties of 3D-printed concrete result in superior compressive strength but poor tensile strength. Furthermore, its layer-by-layer printing and extrusion stacking process is incompatible with traditional reinforcement methods, making it difficult to strengthen with traditional steel cages. This means that while increasing the freedom of form, it is difficult to meet load-bearing requirements. To make 3D-printed concrete landscape furniture both aesthetically pleasing and functional, a spatial curved surface structure that can fully utilize the compressive strength of 3D-printed concrete is needed.

[0004] Landscape furniture typically uses materials such as stone, steel, and wood. Due to technological limitations and processing difficulties, the shapes of landscape furniture are often monotonous and lack comfort. Furthermore, there is a lack of methods for establishing musculoskeletal models and human sitting posture models based on the body characteristic data of the target population. This results in insufficient consideration of human-computer interaction during the design of public furniture, leading to a generally poor user experience. Summary of the Invention

[0005] The purpose of this application is to provide a design method and related products for unreinforced 3D printed concrete landscape chairs that can simultaneously ensure comfort and load-bearing strength requirements.

[0006] To achieve the above objectives, this application provides the following solution:

[0007] In a first aspect, this application provides a design method for an unreinforced 3D-printed concrete landscape chair, the design method comprising:

[0008] Determine the initial landscape chair model;

[0009] A musculoskeletal model of the target population for the landscape chairs is constructed, and human skin modeling is performed based on the musculoskeletal model to obtain a human body model.

[0010] Adjust the positions of the control points in the human body model to construct several human body sitting posture models; each human body sitting posture model has a different sitting posture.

[0011] Establish the contact relationship between each of the human sitting posture models and the initial landscape chair model; the contact relationship includes: the contact relationship between the seat of the initial landscape chair model and the human sitting posture model and the contact relationship between the back of the initial landscape chair model and the human sitting posture model.

[0012] Based on the mutual contact relationship, the forces exerted by each part of each human sitting posture model on the initial landscape chair model are determined to obtain the load dataset; the load dataset includes: seat load dataset and back load dataset.

[0013] The load uniformity coefficient is calculated based on the load dataset, and the initial landscape chair model is locally adjusted based on the load uniformity coefficient to obtain the adjusted landscape chair model.

[0014] After applying a standard load to the adjusted landscape chair model, the extreme values ​​of tensile stress and compressive stress at each part are determined to obtain the strength requirement data;

[0015] The shape of the landscape chair model is adjusted according to the strength requirement data to obtain the design model of the unreinforced 3D printed concrete landscape chair.

[0016] Optionally, the shape of the landscape chair model is adjusted according to the strength requirement data to obtain a design model of an unreinforced 3D-printed concrete landscape chair, specifically including:

[0017] When the extreme value of tensile stress in a part of the landscape chair model exceeds the tensile strength of the 3D printed concrete material, the local upward curvature of the corresponding part is increased.

[0018] When the extreme compressive stress of a part of the landscape chair model exceeds the compressive strength of the 3D printed concrete material, the local thickness of the corresponding part is increased.

[0019] Optionally, the contact relationship between each of the human sitting posture models and the initial landscape chair model is constructed, specifically including:

[0020] The surfaces of the human sitting model and the initial landscape chair model are both defined as elastic catenary meshes to obtain the human body mesh and the landscape chair mesh.

[0021] Define the edge nodes on the surface contour line of the landscape chair mesh as anchor points for deformation constraint;

[0022] A force is applied to the back and thigh positions of the human body mesh, pointing towards the chair surface of the landscape chair mesh, causing the human body mesh to collide with the chair surface, and the catenary mesh shape of the chair surface area in the landscape chair mesh is changed according to the collision relationship.

[0023] By changing the elastic coefficient and initial length of the meshes in the human body mesh and the landscape chair mesh, the morphology of the human body mesh and the landscape chair mesh after their surfaces are in full contact is simulated, and their mutual contact relationship is obtained.

[0024] Optionally, based on the mutual contact relationship, the forces exerted by each part of each of the human sitting posture models on the initial landscape chair model are determined to obtain a load dataset, specifically including:

[0025] For a human sitting posture model:

[0026] Based on the mutual contact relationship, a spherical contact geometry is used to represent the contact area between the ischium and ribs in the human sitting posture model and the initial landscape chair model;

[0027] By defining the contact area and the material properties of the contact surface, the forces exerted by each part of the human sitting posture model on the initial landscape chair model are determined, and load data are obtained.

[0028] Optionally, determining the initial landscape chair model specifically includes:

[0029] While meeting the size requirements of the landscape chair, the spatial curved surface structure of the landscape chair is determined according to the pressure conditions; wherein, the bottom part of the landscape chair is determined to be a positive Gaussian curvature shell; and the seat part of the landscape chair is determined to be a negative Gaussian curvature shell.

[0030] Using parametric design software, an initial landscape chair model was constructed based on the spatial curved surface structure of the landscape chair.

[0031] Optionally, the step of constructing a musculoskeletal model of the target population for the landscape chair, and then performing human skin modeling based on the musculoskeletal model to obtain a human body model, specifically includes:

[0032] Obtain body characteristic data of the target group for the landscape benches; the body characteristic data includes: height, weight, leg length, hip width, and knee height;

[0033] Using musculoskeletal modeling software, a musculoskeletal model is constructed based on the body characteristic data of the target population for the landscape chairs.

[0034] Human skin is modeled based on the musculoskeletal model to obtain a human body model.

[0035] Optionally, the formula for calculating the load uniformity coefficient is:

[0036]

[0037] Among them, F max and F minThese represent the maximum and minimum forces acting on a part of the initial landscape chair model, respectively; s represents the load uniformity coefficient. When the load uniformity coefficient is less than 0.3, the initial landscape chair model no longer needs to be adjusted.

[0038] In a second aspect, this application provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the unreinforced 3D printed concrete landscape chair design method described above.

[0039] Thirdly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the unreinforced 3D printed concrete landscape chair design method described above.

[0040] Fourthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the unreinforced 3D printed concrete landscape chair design method described above.

[0041] According to the specific embodiments provided in this application, the following technical effects are disclosed:

[0042] This application provides a design method and related products for an unreinforced 3D-printed concrete landscape chair. The method includes: determining an initial landscape chair model; constructing a musculoskeletal model of the target population for the landscape chair, and performing human skin modeling based on the musculoskeletal model to obtain a human body model; adjusting the control point positions in the human body model to construct several human sitting posture models; each human sitting posture model has a different sitting posture; and establishing the mutual contact relationship between each human sitting posture model and the initial landscape chair model; the mutual contact relationship includes: the contact relationship between the seat of the initial landscape chair model and the human sitting posture model, and the contact relationship between the backrest of the initial landscape chair model and the human sitting posture model. Based on the mutual contact relationship, the forces exerted by each part of the human sitting posture model on the initial landscape chair model are determined, resulting in a load dataset. The load dataset includes a seat load dataset and a backrest load dataset. A load uniformity coefficient is calculated based on the load dataset, and the initial landscape chair model is locally adjusted according to the load uniformity coefficient to obtain an adjusted landscape chair model. The extreme values ​​of tensile and compressive stresses at each part of the adjusted landscape chair model after applying a standard load are determined, resulting in strength requirement data. The shape of the adjusted landscape chair model is adjusted according to the strength requirement data to obtain a design model for an unreinforced 3D-printed concrete landscape chair. This application constructs a human body model using target population data, calculates a load uniformity coefficient based on the contact relationship between the human body model and the initial landscape chair model, and adjusts the initial landscape chair model according to the load uniformity coefficient, thereby ensuring the comfort of the landscape chair. Furthermore, this application also applies a standard load to the adjusted landscape chair model and adjusts it according to strength requirements; therefore, this application can simultaneously ensure both comfort and load strength requirements. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 A flowchart illustrating a design method for an unreinforced 3D-printed concrete landscape chair, provided as an embodiment of this application;

[0045] Figure 2 This is a schematic diagram of an initial landscape chair model provided in one embodiment of this application;

[0046] Figure 3 This is a schematic diagram illustrating the construction of a human sitting posture model according to an embodiment of this application;

[0047] Figure 4This is a schematic diagram illustrating the ergonomic design optimization provided in one embodiment of this application;

[0048] Figure 5 This is a schematic diagram of the ergonomic design optimization to be performed according to an embodiment of this application;

[0049] Figure 6 This is a schematic diagram illustrating the acquisition of load data according to an embodiment of this application.

[0050] Figure 7 A complete flowchart illustrating a design method for an unreinforced 3D-printed concrete landscape chair, as provided in an embodiment of this application;

[0051] Figure 8 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] The mechanical performance requirements for landscape furniture are mainly implemented according to the relevant provisions of GB 28478—2012 "Safety Performance Requirements for Outdoor Leisure Furniture - Tables and Chairs". However, consideration of the mechanical performance of landscape furniture under actual human load is lacking, and there is a lack of optimized measurement indicators for landscape furniture based on human load models.

[0054] Therefore, in order to meet the needs of 3D printed concrete landscape furniture design, there is an urgent need for a design method that takes into account both the freedom of form and the load-bearing requirements, while also considering comfort and optimizing the mechanical performance of landscape furniture based on the actual load of the human body.

[0055] This application discloses a design method for an unreinforced 3D-printed concrete landscape chair based on the coupling optimization of morphological shaping and mechanical properties. The method includes: introducing a spatial curved surface structure mainly under compression for conceptual design, initially determining the basic shape of the landscape chair, and establishing an initial landscape chair model. Collecting body characteristic data of the target population and constructing a musculoskeletal model, performing skin modeling to obtain a human skin model, and constructing a human sitting posture model by adjusting the model's posture. Based on the initial landscape chair model and the human sitting posture model, computer-aided ergonomic design is performed to initially complete the landscape chair model design that meets human comfort. The interaction between the musculoskeletal model and the landscape chair model under different sitting postures is analyzed, and the mechanical properties of the landscape chair model are evaluated according to specifications. Through the coupling optimization of morphological shaping and mechanical properties, consistency between structural performance, aesthetic form, and ergonomic requirements is achieved. The unreinforced 3D-printed concrete landscape chair based on the coupling optimization of morphological shaping and mechanical properties has higher degrees of freedom, better comfort, and superior mechanical properties.

[0056] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0057] In one exemplary embodiment, such as Figure 1 As shown, a method for designing an unreinforced 3D-printed concrete landscape chair is provided, including the following steps S1 to S8. Wherein:

[0058] S1. Determine the initial landscape chair model.

[0059] Specifically: Under the premise of meeting the size requirements of the landscape chair, the spatial curved surface structure of the landscape chair is determined according to the pressure conditions; wherein, the bottom part of the landscape chair is determined to be a positive Gaussian curvature shell; the seat part of the landscape chair is determined to be a negative Gaussian curvature shell; using parametric design software, an initial landscape chair model is constructed based on the spatial curved surface structure of the landscape chair.

[0060] In this embodiment, the landscape chair is designed with a spatial curved surface structure mainly under pressure, the basic shape of the landscape chair is initially determined, and an initial landscape chair model is established.

[0061] According to the relevant provisions of GB 3326-2016 "Main Dimensions of Furniture Tables, Chairs and Stools", the landscape chair is designed with a spatial curved surface structure primarily under compression, while meeting the basic dimensional requirements, to fully utilize the superior compressive strength of 3D printed concrete. In areas of concentrated tensile stress, a shell structure primarily under compression is considered. Specifically, the seat base can be designed as a positive Gaussian curvature shell, including ellipsoidal shells and parabolic shells; the seat surface can be designed as a negative Gaussian curvature shell, including hyperboloid shells.

[0062] After initially determining the basic shape of the landscape chair, an initial model of the landscape chair was created using the parametric design software Rhino. (See reference...) Figure 2 In parametric design, key parameters affecting the chair's shape and structure are initially defined, such as length, width, height, surface curvature, and thickness. These parameters will be adjusted during subsequent optimization.

[0063] S2. Construct a musculoskeletal model of the target population for the landscape chairs, and perform human skin modeling based on the musculoskeletal model to obtain a human body model.

[0064] Specifically: acquire body characteristic data of the target group for the landscape chairs; use musculoskeletal modeling software to construct a musculoskeletal model based on the body characteristic data of the target group for the landscape chairs; and perform human skin modeling based on the musculoskeletal model to obtain a human body model.

[0065] S3. Adjust the position of the control points in the human body model to construct several human body sitting posture models; each human body sitting posture model has a different sitting posture.

[0066] In this embodiment, the body characteristic data of the target population is first collected. Taking the main users of the 3D-printed concrete landscape chair as the target group, their height, weight, leg length, hip width, knee height, and other body characteristic data are collected. The body characteristic data used in the construction of the musculoskeletal model or in the process of using this data for modeling is the average value of the collected body characteristic data of the target population.

[0067] Then, a musculoskeletal model is constructed based on statistical data.

[0068] The foundation for building a musculoskeletal model is the universal human musculoskeletal model that comes with the OpenSim musculoskeletal modeling software. This universal model can be matched with the body feature data of the target population to achieve the creation of a musculoskeletal model for the target population.

[0069] The software itself provides a general model that supports editing. In the absence of data acquisition equipment, the general musculoskeletal model can be edited by measuring and recording the subject's own body characteristic data, and using interfaces such as MATLAB / Python / C++ to edit the specific marker positions of the general musculoskeletal model to obtain a personalized musculoskeletal model for the subject.

[0070] Next, human skin modeling is performed, and a human seated model is constructed by adjusting the model's posture, such as... Figure 3 As shown.

[0071] Based on a musculoskeletal model reflecting user characteristics, a closed surface with elastic features is added to the surface of the musculoskeletal model using the Grasshopper plugin based on Rhino to simulate the shape of skin, thus creating the human body model. A mesh structure composed of multiple control points is created on top of the human body model, and the positions of these control points are adjusted to match the precise shape of the human body model. Control points of key body parts are selected and connected according to the logical order of the human torso lines to form lines representing the human torso lines. These lines can be used as a basic framework to build a simplified human body model. The morphological changes of the human body in a realistic sitting posture are analyzed, identifying key control points affecting these changes, including the points where the buttocks contact the seat, the knees bend, and the waist bends. The positions of these control points are adjusted on the human body model to create a human sitting posture model, which is then mapped to complete the construction of a corresponding realistic human sitting posture model.

[0072] S4. Establish the mutual contact relationship between each of the human sitting posture models and the initial landscape chair model; the mutual contact relationship includes: the contact relationship between the seat of the initial landscape chair model and the human sitting posture model and the contact relationship between the back of the initial landscape chair model and the human sitting posture model.

[0073] Specifically:

[0074] The surfaces of the human sitting model and the initial landscape chair model are both defined as elastic catenary meshes to obtain the human body mesh and the landscape chair mesh.

[0075] Define the edge nodes on the surface contour line of the landscape chair mesh as anchor points for deformation constraint;

[0076] A force is applied to the back and thigh positions of the human body mesh, pointing towards the chair surface of the landscape chair mesh, causing the human body mesh to collide with the chair surface, and the catenary mesh shape of the chair surface area in the landscape chair mesh is changed according to the collision relationship.

[0077] By changing the elastic coefficient and initial length of the meshes in the human body mesh and the landscape chair mesh, the morphology of the human body mesh and the landscape chair mesh after their surfaces are in full contact is simulated, and their mutual contact relationship is obtained.

[0078] In this embodiment, a human sitting posture model is used to perform computer-aided ergonomic design on the initial landscape chair model.

[0079] The treatment of the contact relationship between the human sitting posture model and the initial landscape chair model is mainly based on the following three principles: (1) good back support, close to the shape of the spine; (2) comfortable adaptation of the buttocks and thighs; (3) the popliteal fossa area is not impacted by the front of the seat.

[0080] Both the surface of the human seated model and the surface of the initial landscape chair model are defined as elastic catenary meshes. Deformation constraints are applied by defining the edge nodes on the surface contour of the initial landscape chair model as anchor points. Forces pointing towards the chair surface are applied to the back and thighs of the human seated model, causing the human seated model to collide with the chair surface and altering the shape of the catenary mesh in the chair surface design area. By changing the elastic coefficient and initial length of the catenary mesh in the chair surface, the shape after the initial landscape chair model and the surface of the human seated model are in full contact can be simulated, thus defining the shape of the contact areas between the chair surface and the back, buttocks, thighs, and calves of the human seated model, such as... Figure 4 and Figure 5 As shown.

[0081] S5. Based on the mutual contact relationship, determine the force exerted by each part of each human sitting posture model on the initial landscape chair model to obtain a load dataset; the load dataset includes: seat load dataset and backrest load dataset.

[0082] For a human sitting posture model:

[0083] Based on the mutual contact relationship, a spherical contact geometry is used to represent the contact area between the ischium and ribs in the human sitting posture model and the initial landscape chair model;

[0084] By defining the contact area and the material properties of the contact surface, the forces exerted by each part of the human sitting posture model on the initial landscape chair model are determined, and load data are obtained.

[0085] In this embodiment, human sitting posture models are established in Opensim for various sitting postures, such as standard sitting, cross-legged sitting, and hunched sitting. The areas of contact between the ischium and ribs in the human sitting posture models and the surface of the chair are represented using spherical contact geometry. Spherical contact geometry can simulate the contact between the human body and the chair surface. By defining the contact area and the material properties of the contact surface, contact analysis is performed to determine the forces exerted on the chair surface by various parts of the human sitting posture model, obtaining the relevant load dataset, such as... Figure 6 As shown.

[0086] S6. Calculate the load uniformity coefficient based on the load dataset, and make local adjustments to the initial landscape chair model based on the load uniformity coefficient to obtain the adjusted landscape chair model.

[0087] Load data of the human sitting posture models under the above three sitting postures on the initial landscape chair were extracted. The human load on the landscape chair under each sitting posture includes two parts: the seat and the backrest. It was determined whether the human load distribution of each part met the uniformity requirement. It is stipulated that the load uniformity coefficient is less than 0.3 to meet the requirement. The load uniformity coefficient is defined as follows:

[0088]

[0089] Among them, F max and F min These represent the maximum and minimum forces acting on a part of the initial landscape chair model, respectively; s represents the load uniformity coefficient. When the load uniformity coefficient is less than 0.3, the initial landscape chair model no longer needs to be adjusted.

[0090] The surface shape of the initial landscape chair model is locally adjusted. Human load distribution is analyzed, and local optimization adjustments are made to areas of uneven human load distribution on the chair surface. The shape of the chair surface is changed by adjusting the elastic coefficient and shrinkage rate of the catenary mesh, generating a series of chair surfaces that match the human sitting posture model, thus achieving coupled optimization of form shaping and mechanical performance. During adjustment, the shape of the chair surface is mainly changed by adjusting the elastic coefficient and shrinkage rate of the catenary mesh. If s > 0.3, the radius of curvature of the landscape chair surface is increased.

[0091] S7. Determine the extreme values ​​of tensile stress and compressive stress at each part of the adjusted landscape chair model after applying a standard load, and obtain the strength requirement data.

[0092] S8. Adjust the shape of the landscape chair model according to the strength requirement data to obtain the design model of the unreinforced 3D printed concrete landscape chair.

[0093] In this embodiment, the type and magnitude of the load that the landscape chair model needs to bear are determined according to the requirements of GB 28478—2012 "Safety Performance Requirements for Outdoor Leisure Furniture - Tables and Chairs". The stress situation of the landscape chair model is simulated by finite element analysis.

[0094] Based on the finite element analysis results, it was determined whether the extreme values ​​of tensile stress and compressive stress of the adjusted landscape chair model exceeded the strength requirements of the 3D printed concrete material.

[0095] If the maximum tensile stress exceeds the tensile strength of the 3D printed concrete material, the local upward curvature can be increased; if the maximum compressive stress exceeds the compressive strength of the 3D printed concrete material, the local thickness can be increased.

[0096] Finally, the concrete is 3D printed to complete the physical object printing.

[0097] This embodiment provides a method for designing an unreinforced 3D-printed concrete landscape chair, the complete flowchart of which is shown below. Figure 7As shown, to address the limitations of 3D-printed concrete reinforcement, a spatial curved surface structure design method based primarily on compression is proposed. This method ensures both the freedom of form for the landscape chair and meets its load-bearing requirements, combining aesthetics and practicality. Furthermore, computer-aided ergonomics is incorporated into the design, considering the interaction between the human body and the chair to improve comfort. Simulations of the load-bearing effects of various human sitting postures on the chair provide direction for the coupled optimization of form design and mechanical performance. By adjusting the local form of weak points under stress, consistency between structural performance, aesthetic form, and ergonomic requirements is achieved. This design method has significant implications for the application of new materials and technologies in the design and manufacture of landscape furniture.

[0098] In one exemplary embodiment, a computer device is provided, which may be a server or a terminal, and its internal structure diagram may be as follows. Figure 8 As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and databases. The internal memory provides the environment for the operating system and computer programs stored in the non-volatile storage media to run. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communicating with external terminals via a network connection. When the computer program is executed by the processor, it implements a method for designing an unreinforced 3D-printed concrete landscape chair.

[0099] Those skilled in the art will understand that Figure 8 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0100] In one exemplary embodiment, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0101] In one exemplary embodiment, a computer-readable storage medium is provided storing a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0102] In one exemplary embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0103] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0104] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0105] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0106] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0107] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A design method for an unreinforced 3D-printed concrete landscape chair, characterized in that, The design method for the unreinforced 3D printed concrete landscape chair includes: Determine the initial landscape chair model; A musculoskeletal model of the target population for the landscape chairs is constructed, and human skin modeling is performed based on the musculoskeletal model to obtain a human body model. Adjust the positions of the control points in the human body model to construct several human body sitting posture models; each human body sitting posture model has a different sitting posture. Establish the contact relationship between each of the human sitting posture models and the initial landscape chair model; the contact relationship includes: the contact relationship between the seat of the initial landscape chair model and the human sitting posture model and the contact relationship between the back of the initial landscape chair model and the human sitting posture model. Based on the mutual contact relationship, the forces exerted by each part of each human sitting posture model on the initial landscape chair model are determined to obtain the load dataset; the load dataset includes: seat load dataset and back load dataset. The load uniformity coefficient is calculated based on the load dataset, and the initial landscape chair model is locally adjusted based on the load uniformity coefficient to obtain the adjusted landscape chair model. After applying a standard load to the adjusted landscape chair model, the extreme values ​​of tensile stress and compressive stress at each part are determined to obtain the strength requirement data; Based on the strength requirement data, the shape of the landscape chair model is adjusted to obtain the design model of the unreinforced 3D printed concrete landscape chair. Establishing the contact relationship between each of the human sitting posture models and the initial landscape chair model specifically includes: The surfaces of the human sitting model and the initial landscape chair model are both defined as elastic catenary meshes to obtain the human body mesh and the landscape chair mesh. Define the edge nodes on the surface contour line of the landscape chair mesh as anchor points for deformation constraint; A force is applied to the back and thigh positions of the human body mesh, pointing towards the chair surface of the landscape chair mesh, causing the human body mesh to collide with the chair surface, and the catenary mesh shape of the chair surface area in the landscape chair mesh is changed according to the collision relationship. By changing the elastic coefficient and initial length of the meshes in the human body mesh and the landscape chair mesh, the morphology of the human body mesh and the landscape chair mesh after their surfaces are in full contact is simulated, and their mutual contact relationship is obtained.

2. The design method for unreinforced 3D printed concrete landscape chairs according to claim 1, characterized in that, Based on the strength requirement data, the shape of the landscape chair model is adjusted to obtain a design model of an unreinforced 3D printed concrete landscape chair, specifically including: When the extreme value of tensile stress in a part of the landscape chair model exceeds the tensile strength of the 3D printed concrete material, the local upward curvature of the corresponding part is increased. When the extreme compressive stress of a part of the landscape chair model exceeds the compressive strength of the 3D printed concrete material, the local thickness of the corresponding part is increased.

3. The design method for unreinforced 3D printed concrete landscape chairs according to claim 1, characterized in that, Based on the mutual contact relationships, the forces exerted by each part of the human sitting posture model on the initial landscape chair model are determined, resulting in a load dataset, which specifically includes: For a human sitting posture model: Based on the mutual contact relationship, a spherical contact geometry is used to represent the contact area between the ischium and ribs in the human sitting posture model and the initial landscape chair model; By defining the contact area and the material properties of the contact surface, the forces exerted by each part of the human sitting posture model on the initial landscape chair model are determined, and load data are obtained.

4. The design method for unreinforced 3D printed concrete landscape chairs according to claim 1, characterized in that, The determination of the initial landscape chair model specifically includes: While meeting the size requirements of the landscape chair, the spatial curved surface structure of the landscape chair is determined according to the pressure conditions; wherein, the bottom part of the landscape chair is determined to be a positive Gaussian curvature shell; and the seat part of the landscape chair is determined to be a negative Gaussian curvature shell. Using parametric design software, an initial landscape chair model was constructed based on the spatial curved surface structure of the landscape chair.

5. The design method for unreinforced 3D printed concrete landscape chairs according to claim 1, characterized in that, The process of constructing a musculoskeletal model of the target population for the landscape chair, and then performing human skin modeling based on the musculoskeletal model to obtain a human body model, specifically includes: Obtain body characteristic data of the target group for the landscape benches; the body characteristic data includes: height, weight, leg length, hip width, and knee height; Using musculoskeletal modeling software, a musculoskeletal model is constructed based on the body characteristic data of the target population for the landscape chairs. Human skin is modeled based on the musculoskeletal model to obtain a human body model.

6. The design method for unreinforced 3D printed concrete landscape chairs according to claim 1, characterized in that, The formula for calculating the load uniformity coefficient is as follows: ； in, F max and F min These represent the maximum and minimum forces acting on a part of the initial landscape chair model, respectively. s This represents the load uniformity coefficient. When the load uniformity coefficient is less than 0.3, the initial landscape chair model no longer needs to be adjusted.

7. A computer device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the design method for unreinforced 3D printed concrete landscape chairs according to any one of claims 1-6.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the design method for unreinforced 3D printed concrete landscape chairs as described in any one of claims 1-6.

9. A computer program product, comprising a computer program, characterized in that, When executed by a processor, the computer program implements the design method for unreinforced 3D printed concrete landscape chairs as described in any one of claims 1-6.

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