Method and device for evaluating energy consumption influence of mattress on change of sleeping posture of human body

Abstract

The invention belongs to the technical field of human body health monitoring, and discloses a method and a device for evaluating the energy consumption influence of a mattress on human body sleeping posture change. The method comprises the following steps: establishing mattress models with different attributes, analyzing sleep behaviors of a human body, establishing a digital human body model, constructing a human-bed coupling model, and carrying out dynamic simulation analysis on a sleeping posture change process of the human body on the mattress, so as to obtain a dynamic simulation result; therefore, the real-time strain energy and potential energy on mattresses with different attributes and under different sleeping postures in the human sleeping posture changing process can be accurately calculated, the energy consumption influence of the mattresses on the human sleeping posture changing can be accurately evaluated, the method is not limited by specific experiment places, and application and popularization are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of human health monitoring, and particularly to an evaluation method and device for the influence of a mattress on the energy consumption caused by the change of human sleeping posture. Background Art

[0002] Sleep is the guarantee of human physical and mental health, and has important impacts on people's social interaction, emotions, quality of life, work efficiency, etc. During one night's sleep, a person usually makes 20 to 50 turning over or posture adjustment behaviors, so as to adjust the pressure distribution on the human body, avoid local long-term pressure, facilitate blood circulation and nerve conduction, and relieve muscle fatigue.

[0003] The turning over or posture adjustment behavior of a person during sleep is a process of the interaction of forces between the person and the bed. The difficulty of changing the human sleeping posture behavior is affected by the support performance such as the softness and hardness of the mattress. It is relatively easy for a person to turn over on a harder mattress, but a hard mattress may cause excessive local pressure on the human body, resulting in soft tissue ischemia and soreness, and forcing a person to turn over too frequently during sleep, affecting sleep comfort. It is relatively difficult for a person to turn over on a softer mattress because the depression amount of the human body on a softer mattress is larger, the contact area between the person and the bed is larger, and the gravity of the human body and the binding force of the mattress that the human body needs to overcome during the turning over process are both larger, and the energy consumption is larger. Further, it affects the number of turning over times of the human body during sleep, thus affecting sleep comfort.

[0004] At present, the evaluation methods for human sleep energy consumption are mainly direct calorimetry, indirect calorimetry, doubly labeled water method, formula method, wearable sensor test method, etc. based on human metabolism. However, the process of changing the sleeping posture of a person during sleep is a complex biomechanical behavior process. In addition to the energy consumed by metabolism, it also includes the strain energy caused by the action of the human body on the mattress, that is, the deformation of the mattress, and the energy consumed by the change of the human body's own potential energy. The existing methods are not applicable to the quantitative calculation of the energy consumption caused by the change of the human sleeping posture on the mattress, cannot be accurately evaluated, and are also restricted by specific experimental sites, which is not conducive to application and popularization.

[0005] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0006] The main purpose of the present invention is to provide an evaluation method and device for the influence of a mattress on the energy consumption caused by the change of human sleeping posture, aiming to solve the technical problems that the existing methods are not applicable to the quantitative calculation of the energy consumption caused by the change of the human sleeping posture on the mattress, cannot be accurately evaluated, and are also restricted by specific experimental sites, which is not conducive to application and popularization.

[0007] To achieve the above object, the present invention provides an evaluation method for the influence of a mattress on the energy consumption caused by the change of human body sleeping posture. The evaluation method for the influence of a mattress on the energy consumption caused by the change of human body sleeping posture includes the following steps:

[0008] Use an infrared camera to record the sleeping behavior of the subject to obtain sleeping behavior information, and extract the postural parameter of the characteristic action of the human body sleeping posture from the sleeping behavior information;

[0009] Use a three-dimensional scanner to scan the subject to obtain the human body shape parameter information;

[0010] Based on the postural parameter of the characteristic action of the human body sleeping posture, adjust the posture of the digital human model based on the human body shape parameter information to establish digital human models under different characteristic actions of the sleeping posture;

[0011] Construct mattress models corresponding to different attributes based on the basic parameters of the mattress;

[0012] Construct a human-bed coupling model based on the digital human models under different characteristic actions of the sleeping posture and the mattress models corresponding to different attributes;

[0013] Use the human-bed coupling model to perform energy analysis on the behavior of the change of the human body sleeping posture to evaluate the influence of different mattresses on the energy consumption caused by the change of the human body sleeping posture.

[0014] In some embodiments, the selected wavelength of the infrared camera is greater than 900 nm, the sampling rate is 50 f / s, and the postural parameter of the characteristic action of the human body sleeping posture extracted is the postural parameter corresponding to the characteristic actions of 0°, 15°, 30°, 45°, 60°, 75°, and 90° with the bed surface as the reference plane when the human body turns over.

[0015] In some embodiments, the adjusting the posture of the digital human model based on the human body shape parameter information according to the postural parameter of the characteristic action of the human body sleeping posture to establish digital human models under different characteristic actions of the sleeping posture includes:

[0016] Obtain a digital human model in a closed standard template library format according to the human body shape parameter information;

[0017] Import the digital human model into 3D rendering software, and use skinning animation to bind the model mesh of the digital human model to a specific virtual human skeleton, and drive the movement of the entire digital human model by controlling the movement of the specific virtual human skeleton;

[0018] Repair and solidify the digital human model through reverse engineering software to obtain digital human models under different characteristic actions of the sleeping posture.

[0019] In some embodiments, constructing a human-bed coupling model based on the digital human models in different sleeping posture characteristic action postures and the mattress models corresponding to different attributes includes:

[0020] Import the digital human models in different sleeping posture characteristic action postures and the mattress models corresponding to different attributes into finite element analysis software, and perform assembly in the assembly module to determine the positions of the models, so as to obtain a human-bed coupling model. The mesh division unit of the mattress models corresponding to different attributes is a regular hexahedron unit, and the mesh division unit of the digital human models in different sleeping posture characteristic action postures is a tetrahedron unit. The contact type is set as surface-to-surface contact. The bottom of the mattress models corresponding to different attributes is fixed, and for the digital human models in different sleeping posture characteristic action postures.

[0021] In some embodiments, using the human-bed coupling model to perform energy analysis on the behavior of human sleeping posture change to evaluate the influence of different mattresses on the energy consumption of human sleeping posture change includes:

[0022] Using finite element software to analyze the interface pressure between the digital human models in different sleeping posture characteristic action postures and the mattress models corresponding to different attributes during the sleeping posture change process based on the human-bed coupling model;

[0023] Convert the human-bed interface pressure into the human-bed interface depression amount according to the mattress material properties;

[0024] Select a torso and limb angle at a preset angle interval to perform simulation analysis on the human-bed interface depression amount, and obtain the dynamic simulation result of the human-bed interface depression amount during the whole process of sleeping posture change;

[0025] Perform energy analysis on the behavior of human sleeping posture change according to the dynamic simulation result of the human-bed interface depression amount to evaluate the influence of different mattresses on the energy consumption of human sleeping posture change.

[0026] In some embodiments, performing energy analysis on the behavior of human sleeping posture change according to the dynamic simulation result of the human-bed interface depression amount to evaluate the influence of different mattresses on the energy consumption of human sleeping posture change includes:

[0027] Perform energy analysis on the behavior of human sleeping posture change according to the dynamic simulation result of the human-bed interface depression amount to obtain the strain energy of the mattress during the sleeping posture change process, the energy consumed by the work done to overcome the change of the center of gravity of each part of the human body, and the human resting energy consumption;

[0028] Determine the total energy consumption according to the strain energy of the mattress, the energy consumed by the work done to overcome the change of the center of gravity of each part of the human body, and the human resting energy consumption;

[0029] Evaluate the energy consumption impact of different mattresses on the change of human sleeping postures based on the total energy consumption.

[0030] In some embodiments, the strain energy of the mattress is obtained by converting the energy consumed by the human body doing work on the mattress, and is determined by the height of the mattress, the elastic modulus of the mattress material, the pressure, and the total pressure contact area. The energy consumed by the work done to overcome the change in the center of gravity of each part of the human body itself is determined by the change in the height of the center of gravity of each part of the human body, and the energy consumed by human resting is determined by human parameters.

[0031] In addition, to achieve the above object, the present invention also proposes an evaluation device for the energy consumption impact of a mattress on the change of human sleeping postures. The evaluation device for the energy consumption impact of a mattress on the change of human sleeping postures includes:

[0032] A shooting module, configured to record the sleeping behavior of a subject by using an infrared camera, obtain sleeping behavior information, and extract the postural characteristic action posture parameters of the human sleeping posture from the sleeping behavior information;

[0033] A scanning module, configured to scan the subject by using a three-dimensional scanner to obtain human body shape parameter information;

[0034] A construction module, configured to adjust the posture of a digital human model based on the human body shape parameter information according to the postural characteristic action posture parameters of the human sleeping posture, so as to establish a digital human model in different postural characteristic actions of the sleeping posture;

[0035] The construction module is configured to construct a mattress model corresponding to different attributes based on the basic parameters of the mattress;

[0036] The construction module is configured to construct a human-bed coupling model based on the digital human model in different postural characteristic actions of the sleeping posture and the mattress models corresponding to different attributes;

[0037] An evaluation module, configured to perform energy analysis on the human sleeping posture change behavior by using the human-bed coupling model, so as to evaluate the energy consumption impact of different mattresses on the change of human sleeping postures.

[0038] In some embodiments, the selected wavelength of the infrared camera is greater than 900 nm, the sampling rate is 50 f / s, and the postural characteristic action posture parameters of the human sleeping posture extracted are the posture parameters corresponding to the characteristic actions of 0°, 15°, 30°, 45°, 60°, 75°, and 90° with the bed surface as the reference plane when the human body turns over.

[0039] In some embodiments, the construction module is configured to obtain a digital human model in a closed standard template library format according to the human body shape parameter information;

[0040] Import the digital human model into 3D rendering software, and use skinning animation to bind the model mesh of the digital human model to specific virtual human bones. Control the movement of the specific virtual human bones to drive the movement of the entire digital human model;

[0041] Repair and solid construct the digital human model through reverse engineering software to obtain digital human models in different sleeping posture characteristic action postures.

[0042] The present invention uses an infrared camera to record the sleep behavior of a subject to obtain sleep behavior information, and extracts human sleeping posture characteristic action posture parameters from the sleep behavior information; uses a 3D scanner to scan the subject to obtain human body shape parameter information; based on the human sleeping posture characteristic action posture parameters, adjusts the posture of the digital human model based on the human body shape parameter information to establish digital human models in different sleeping posture characteristic action postures; constructs mattress models corresponding to different attributes based on the basic parameters of the mattress; constructs a human-bed coupling model based on the digital human models in different sleeping posture characteristic action postures and the mattress models corresponding to different attributes; uses the human-bed coupling model to perform energy analysis on the behavior of human sleeping posture change to evaluate the influence of different mattresses on the energy consumption of human sleeping posture change. Through the above method, the influence of the mattress on the energy consumption of human sleeping posture change can be accurately evaluated, and it is not restricted by a specific experimental site, which is convenient for application and popularization. Brief Description of the Drawings

[0043] Figure 1 It is a schematic flowchart of the first embodiment of the evaluation method for the influence of the mattress of the present invention on the energy consumption of human sleeping posture change;

[0044] Figure 2 It is a schematic diagram of the characteristic actions of human sleeping posture change in the evaluation method for the influence of the mattress of the present invention on the energy consumption of human sleeping posture change;

[0045] Figure 3 It is a schematic diagram of the human-bed coupling model in the evaluation method for the influence of the mattress of the present invention on the energy consumption of human sleeping posture change;

[0046] Figure 4 It is a schematic diagram of the solution result of the human-bed interface pressure of the human-bed coupling model in the evaluation method for the influence of the mattress of the present invention on the energy consumption of human sleeping posture change;

[0047] Figure 5 It is a schematic diagram of the solution result of the mattress depression amount in the human-bed coupling model in the evaluation method for the influence of the mattress of the present invention on the energy consumption of human sleeping posture change;

[0048] Figure 6Schematic diagram of the depression amount at the human-mattress interface in the 45° sleeping position in the evaluation method of the energy consumption impact of the mattress of the present invention on the change of human sleeping posture;

[0049] Figure 7 Schematic diagram of the energy consumption analysis of the change of human sleeping posture in the evaluation method of the energy consumption impact of the mattress of the present invention on the change of human sleeping posture;

[0050] Figure 8 Structural block diagram of the first embodiment of the evaluation device for the energy consumption impact of the mattress of the present invention on the change of human sleeping posture.

[0051] The realization, functional characteristics and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0052] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0053] The embodiment of the present invention provides an evaluation method for the energy consumption impact of a mattress on the change of human sleeping posture. Refer to Figure 1 , Figure 1 Flow chart of the first embodiment of an evaluation method for the energy consumption impact of a mattress of the present invention on the change of human sleeping posture.

[0054] In this embodiment, the evaluation method for the energy consumption impact of the mattress on the change of human sleeping posture includes the following steps:

[0055] Step S10: Use an infrared camera to record the sleeping behavior of the subject to obtain sleeping behavior information, and extract the action posture parameters of the human sleeping posture characteristics from the sleeping behavior information.

[0056] In this embodiment, the execution subject of this embodiment is an evaluation device for the energy consumption impact of a mattress on the change of human sleeping posture. Among them, the evaluation device for the energy consumption impact of a mattress on the change of human sleeping posture has functions such as data processing, data communication and program operation. The evaluation device for the energy consumption impact of a mattress on the change of human sleeping posture can be a computer terminal device or other network devices. Of course, it can also be other devices with similar functions. This embodiment does not limit this.

[0057] It should be noted that currently, the evaluation methods for the energy consumption of human sleep are mainly based on human metabolism, including direct calorimetry, indirect calorimetry, doubly labeled water method, formula method, wearable sensor testing method, etc. However, the process of changing body positions during sleep is a complex biomechanical behavior process. In addition to the energy consumed by metabolism, it also includes the strain energy caused by the action of the human body on the mattress, i.e., the deformation of the mattress, and the energy consumed by the change of the body's own potential energy. The existing methods are not applicable to the quantitative calculation of the energy consumption during the change of body positions on the mattress, cannot accurately evaluate, and are also restricted by specific experimental sites, which is not conducive to application and popularization.

[0058] To solve the above technical problems, in this embodiment, an infrared camera is used to record the sleep behavior of the subject to obtain sleep behavior information, and the body position characteristic action posture parameters of the human body are extracted from the sleep behavior information; a three-dimensional scanner is used to scan the subject to obtain the body shape parameter information of the human body; based on the body position characteristic action posture parameters, the digital human model based on the body shape parameter information of the human body is adjusted in posture to establish digital human models under different body position characteristic action postures; a mattress model corresponding to different attributes is constructed based on the basic parameters of the mattress; a human-mattress coupling model is constructed based on the digital human models under different body position characteristic action postures and the mattress models corresponding to different attributes; the human-mattress coupling model is used to perform energy analysis on the behavior of changing body positions of the human body to evaluate the influence of different mattresses on the energy consumption of the change of body positions of the human body. Through the above method, the influence of the mattress on the energy consumption of the change of body positions of the human body can be accurately evaluated, and it is not restricted by specific experimental sites, which is convenient for application and popularization. Specifically, it can be implemented in the following manner.

[0059] In this embodiment, the types of body position change behaviors, the time consumed, the angles of the trunk and limbs, etc. during the process of changing body positions in sleep information are extracted as the body position characteristic action posture parameters of the human body for the subsequent digital human model. Among them, the types of body position change behaviors are summarized as directly turning over to change the body position, turning over by lifting one lower limb to change the body position, and turning over by lifting one upper and lower limb to change the body position; the action behaviors from the supine position to the left lateral position or the right lateral position can be summarized into two types. One is to use the calf and foot for leverage and kick to change the body position; the other is to use the elbow and palm of the arm to achieve turning over to change the body position. The angles of the trunk and limbs are the angles of the trunk and limbs at any moment or an angle is taken every n°, where 0 < n ≤ 90 during the process of changing the body position action.

[0060] In a specific implementation, in this embodiment, the infrared imaging method is adopted, and the laboratory sleep behavior video acquisition and monitoring system equipment is used to record the sleep process of the experimenter from 23:00 at night to 7:00 the next day. Considering the influence of night light on human sleep, an infrared camera with a wavelength greater than 900 nm and a sampling rate of 50 f / s is selected. The infrared camera is installed on the wall at the end of the mattress, and the image covers the entire mattress with a wide and unobstructed field of view, ensuring that all irregular sleep activities are within the recording range of the camera. During the acquisition process, it is necessary to ensure that the indoor temperature is (23±2)°C, the relative humidity is (50±5)%, and the environment is quiet, so as to restore the real sleep scene to obtain effective experimental sleep videos. Then, the sleep videos are detected and classified, and effective and real human body turning action behaviors are extracted from a large number of sleep videos. The turning behaviors are analyzed and summarized, and finally seven characteristic actions of 0°, 15°, 30°, 45°, 60°, 75°, and 90° with the bed surface as the reference plane are obtained when the human body turns over, providing parameter information for various actions for subsequent digital human body modeling. Specifically, it can be referred to Figure 2 As shown, taking n = 15 as an example; a, b, c, d, e, f, g are the human body characteristic actions of 0°, 15°, 30°, 45°, 60°, 75°, and 90° with the bed surface as the reference degree when the human body sleeping posture changes.

[0061] Step S20: Scan the subject using a 3D scanner to obtain human body shape parameter information.

[0062] It should be noted that using 3D scanning technology to perform a three-dimensional scan on the subject, obtaining the human body shape parameter information of the subject, generating a personalized human body model. The human body model is established based on human body characteristic parameters, which can accurately describe the human body morphological characteristics and is very important in the research, analysis, design, and evaluation of the man-machine system.

[0063] Step S30: Based on the posture parameters of the human body sleeping posture characteristic actions, adjust the posture of the digital human body model based on the human body shape parameter information to establish digital human body models in different sleeping posture characteristic action postures.

[0064] In this embodiment, a digital human body model in the format of a closed standard template library is obtained according to the human body shape parameter information; the digital human body model is imported into 3D rendering software, and the model mesh of the digital human body model is bound to a specific virtual human skeleton using skinning animation, and the movement of the entire digital human body model is driven by controlling the specific virtual human skeleton; the digital human body model is repaired and physically constructed through reverse engineering software to obtain digital human body models in different sleeping posture characteristic action postures.

[0065] Specifically, the three-dimensional scanning system performs in-depth fusion and automatic stitching on the scanned data through computer software to obtain a personalized human body model in the format of a closed standard template library (STL). Then, the human body model in the STL file is imported into 3D rendering software. Using the principle of "skin animation", the model mesh is bound to specific "bones", and the movement of the entire model is driven by controlling the movement of the bones, adjusting the human body model with characteristic actions at seven different turning angles during the human body turning motion, such as characteristic human body models with turning angles of 0°, 15°, 30°, 45°, 60°, 75°, and 90°. Finally, the human body model is repaired and constructed into a solid through reverse engineering software. Operations such as patching, smoothing, and filling holes are performed in the polygon stage to improve the quality of the polygon surface. In the surface generation stage, the contour lines of the model surface are detected, and operations such as generating surface patches, repairing surface patches, constructing grids, and forming NURBS surfaces are carried out, and the exported format is an Initial Graphics Exchange Specification (IGS) file. Finally, the IGS file is imported into finite element analysis software, and the material properties of the Mooney-Rivlin model are adopted for the human body model in the finite element simulation software, as shown in Table 1 below.

[0066] Table 1:

[0067]

[0068] Step S40: Construct mattress models corresponding to different attributes based on the basic parameters of the mattress.

[0069] In this embodiment, data on the internal structure and material properties of the mattress are obtained through experiments, a one-to-one size model of the mattress is built, and the built mattress model is imported into finite element analysis software, and various experimental data parameters are assigned to generate a finite element mattress model. The specific tests are as follows: The supporting surface of the mattress material and the sponge filling material are cut into specimens with a size of 100mm * 100mm * 100mm, and 3 replicated specimens of each material are prepared. And they are placed in a constant temperature and humidity environment with a temperature of 20°C and a relative humidity of 65% for at least 16h. The test method can be the national standard test method, such as GB / T 18942.1-2003 "Determination of Compressive Stress-Strain Properties of Cellular Elastomeric Materials - Part 1". A universal mechanical testing machine is used to perform uniaxial compression on the specimens. During the experiment, the indenter is loaded at a uniform speed of 3mm / s, and the pressure is stopped after loading to 75% of the original specimen thickness and then unloaded to the original position of the indenter at the same speed. Each specimen is subjected to uniaxial compression with 3 identical specimens, and the specimens need to be left standing for at least 12 hours before repeating the experiment. The compressive performance data measured through the experiment will be applied to the mechanical properties of the mattress material in the human-bed interface pressure simulation.

[0070] Step S50: Construct a human-mattress coupling model based on the digital human models in different sleeping posture characteristic action postures and the mattress models corresponding to different attributes.

[0071] In a specific implementation, import the digital human models in different sleeping posture characteristic action postures and the mattress models corresponding to different attributes into finite element analysis software, and perform assembly in the assembly module to determine the positions of the models, so as to obtain a human-mattress coupling model. The mesh division unit of the mattress model corresponding to different attributes is a regular hexahedron unit, and the mesh division unit of the digital human model in different sleeping posture characteristic action postures is a tetrahedron unit. The contact type is set to surface-to-surface contact. The bottom of the mattress model corresponding to different attributes is fixed, and for the digital human model in different sleeping posture characteristic action postures.

[0072] It should be noted that the digital human models in different postures and the mattress models with different attributes are assembled by using the finite element method. The mesh division of the human model preferably uses tetrahedron units, the mesh division of the mattress model preferably uses regular hexahedron units, and the force analysis of the human-mattress interface preferably uses the implicit dynamics analysis method. Thus, the surface in contact between the mattress and the human body is defined as the main surface, and the surface of the human model is defined as the slave surface. The model after human-mattress coupling is shown as Figure 3 shown.

[0073] Step S60: Perform energy analysis on the human sleeping posture change behavior by using the human-mattress coupling model to evaluate the influence of different mattresses on the energy consumption of human sleeping posture change.

[0074] In a specific implementation, use finite element software to analyze the interface pressure between the digital human model in different sleeping posture characteristic action postures and the mattress model corresponding to different attributes during the sleeping posture change process based on the human-mattress coupling model; convert the human-mattress interface pressure into the human-mattress interface depression amount according to the mattress material property; select a trunk and limb angle at a preset angle interval to perform simulation analysis on the human-mattress interface depression amount to obtain the dynamic simulation result of the human-mattress interface depression amount during the whole process of sleeping posture change; perform energy analysis on the human sleeping posture change behavior according to the dynamic simulation result of the human-mattress interface depression amount to evaluate the influence of different mattresses on the energy consumption of human sleeping posture change.

[0075] It should be noted that the solution control parameters set when solving the human-bed coupling model are as follows: For element settings, the denser the mesh, the higher the accuracy. The mesh setting of the mattress model adopts the neutral axis algorithm, with hexahedral elements, and the element type is C3D8RH with a size of 17 nm. The mesh division element shape of the human body model is tetrahedral elements. Interaction property settings: The force analysis of the human-bed interface is implicit dynamics, and the contact type is set as surface-to-surface contact. Applying loads and boundary conditions: Set the bottom of the mattress model to be completely fixed, and apply a gravity load to the human body model. Solving process wield: Create an analysis step job, use 12 processors for parallel processing, and submit the job. The solution results are viewed in the visualization module of the finite element software. Select the displacement data, create and output the set of each point on the mattress surface, so as to complete the extraction of the simulation results of the mattress surface pressure matrix and the sag amount matrix. Among them, the schematic diagram of the solution result of the human-bed interface pressure and the schematic diagram of the solution result of the human-bed interface sag amount can be referred to respectively Figure 4 and Figure 5 as shown

[0076] Furthermore, the dynamic simulation process is to use the finite element software to analyze the interface pressure matrix between the digital human body model in different postures and the mattresses with different properties during the change of sleeping postures, convert the human-bed interface pressure into the human-bed interface sag amount matrix according to the mattress material properties and output it. Take a trunk and limb angle every n° (0 < n ≤ 90) for simulation analysis, and finally obtain the dynamic simulation results of the human-bed interface sag amount during the whole process of sleeping posture change. Based on the dynamic simulation results of the human-bed interface sag amount during the whole process of sleeping posture change, taking 45° as an example, the results of the human-bed interface sag amount in the 45° sleeping posture can be referred to Figure 6 as shown. According to the principle of energy conservation, conduct an energy analysis on the action behavior of the human body's sleeping posture change, construct a calculation model of the mattress strain energy and the human body's sleeping posture change potential energy under different action behaviors of different sleeping postures on different property mattresses, and use data analysis software to calculate the work done or energy consumed by the human body during the sleeping posture change process.

[0077] Furthermore, according to the dynamic simulation results of the human-bed interface sag amount, conduct an energy analysis on the human body's sleeping posture change behavior, and obtain the strain energy of the mattress, the energy consumed by the work done to overcome the change of the center of gravity of each part of the human body itself, and the human body's resting energy consumption during the sleeping posture change process; determine the total energy consumption according to the strain energy of the mattress, the energy consumed by the work done to overcome the change of the center of gravity of each part of the human body itself, and the human body's resting energy consumption; evaluate the influence of different mattresses on the energy consumption of the human body's sleeping posture change based on the total energy consumption.

[0078] It should be noted that, according to the principle of conservation of energy, by analyzing the energy of the human body's sleeping position change actions, it is obtained that the work done or energy consumed by the human body during the sleeping position change includes three parts: the energy consumed by the human body doing work on the mattress is converted into the strain energy Vε of the mattress; the energy consumed by doing work to overcome the change of the center of gravity of each part of the human body itself is U H ; the resting energy expenditure REE of the human body, that is, the total energy consumption U total = Vε + U H + REE, among which, the calculation model of the energy consumed by the human body doing work on the mattress and converted into the strain energy (Vε) of the mattress.

[0079]

[0080] Among them, L is the height of the mattress (m), E is the elastic modulus of the mattress material (Pa), F is the pressure (N), and A is the total pressure contact area (m2).

[0081] For example:

[0082] The reference state is: state 0: there is no one on the bed, and the bed surface is set as the reference plane; state 1: the interaction between the person and the bed forms a pressure (kPa) matrix at the person - bed interface, and the mattress deforms to absorb energy U 1 ; state 2: the interaction between the person and the bed forms a pressure (kPa) matrix at the person - bed interface, and the mattress deforms to absorb energy U 2 .

[0083] The pressure (kPa) matrix at the person - bed interface is converted into a force F matrix and a deformation (ΔL) matrix through operations. For each point:

[0084] From state 0 to state 1, energy is absorbed, and the strain energy:

[0085] Vε0→1 = U0→1 = F 1 ΔL 1 / 2

[0086] From state 0 to state 2, energy is absorbed, and the strain energy:

[0087] Vε0→2 = U0→2 = F 2 ΔL 2 / 2

[0088] The energy absorbed finally from state 1 to state 2:

[0089] ΔU = U0→2 - U0→1;

[0090] Vε = ΔU = U0→2 - U0→1;

[0091] The strain energy of a certain point on the mattress:

[0092]

[0093] Among them, ΔL is the deformation of each point of the mattress, obtained from the depression amount at the human-mattress interface.

[0094] Furthermore, the energy (U H ) consumption of the work done to overcome the change in the center of gravity of each part of the human body. During the process of changing the sleeping position, the center of gravity of each part of the human body changes, and the change in the center of gravity of each part of the human body requires energy consumption. Number the joints of each part of the human body: 1 - head, 2 - torso, 3 - left arm, 4 - right arm, 5 - left leg and foot, 6 - right leg and foot ······ n - limb name, then the corresponding center of gravity points of each part are: G1 (head), G2 (torso), G3 (left arm), G4 (right arm), G5 (left leg and foot), G6 (right leg and foot), ······, Gn (limb name). Specifically, it can be referred to Figure 7 .

[0095] From the 0 state, with the mattress surface as the height reference benchmark, the height of the center of gravity of each part is:

[0096] State 1: H Y1 , H Y2 , H Y3 , H Y4 , H Y5 , H Y6 ,.......,, H Yn ;

[0097] State 2: H c1 , H c2 , H c3 , H c4 , H c5 , H c6 ,......, H cn .

[0098] Then the change in height difference of the center of gravity point of each part from state 1 to state 2 is:

[0099] ΔHn = Hcn - HYn

[0100] Then the work required for the change in the center of gravity of each part of the human body is:

[0101] U H = G 1 ΔH 1 + G 2 ΔH 2 + G 3 ΔH 3 + G 4 ΔH 4 + G 5 ΔH 5 + G 6 ΔH 6 +...... + Gn ΔH n ;

[0102] Among them, the parameters of each part of the body can be referred to as shown in Table 2 below.

[0103] Table 2:

[0104]

[0105] Furthermore, the calculation formula for the resting energy expenditure (REE) of the human body is as follows:

[0106] REE = RMR * T

[0107] Among them, RMR is the resting metabolic rate [kJ(kcal / (m2·h))], and T is the time (h).

[0108] The resting metabolic rate is related to gender, weight, height, and age. For men: REE = 10 * weight (kg) + 6.25 * height (cm) - 5 * age + 5; for women: REE = 10 * weight + 6.25 * height (cm) - 5 * age - 161. The above analysis of the energy consumption change due to the change of human body sleeping posture can be referred to Figure 7 as shown.

[0109] Furthermore, a specific example is used for illustration. The experimental mattress is a sponge mattress with a height of 0.3m, that is, L = 0.3m, which is a fixed value. The elastic modulus E of the mattress is obtained through the mattress mechanical property test, and E = 58.1586 Pa, which is a fixed value. The stress F N and the contact area A are calculated by converting the pressure matrix derived from the solution results of the human-bed coupling model; using the subsidence matrix obtained by solving in the human-bed coupling model.

[0110] In the initial state: A = 0.3584m2

[0111] In the final state: A = 0.3132m2

[0112] Through calculation, it can be obtained Finally, Vε = 2.5275 J can be obtained.

[0113] The second part of potential energy: U H = G 1 ΔH 1 + G 2 ΔH 2 + G 3 ΔH 3 + G 4 ΔH 4 + G 5 ΔH 5 + G6 ΔH 6 ; Here, turning over to the left is considered a left turn, then ΔH 1 、ΔH 3 、ΔH 5 is 0, that is, U H = G 2 ΔH 2 + G 4 ΔH 4 + G 6 ΔH 6 The height of this experimenter is 180 cm and the weight is 78 kg. Then the potential energy corresponding to this subject is as follows: The potential energy of the torso part is G 2 ΔH 2 = m_torso * g * ΔH 2 , m_torso = m_waist + m_clavicle + m_neck + m_chest = 36.74 kg; ΔH 2 = 0.124 m; G 2 ΔH 2 = 36.74 * 9.8 * 0.124 = 44.65 J.

[0114] The resting energy expenditure of the human body: REE = (10 * 78 kg + 6.25 * 1.80 m - 5 * 23 + 5) * (3 / 3600) = 0.57 J, then U_total = Vε + U H + REE = 2.5275 + 44.65 + 0.57 = 47.7475 J.

[0115] In this embodiment, an infrared camera is used to record the sleep behavior of the subject to obtain sleep behavior information, and human body sleeping posture characteristic action posture parameters are extracted from the sleep behavior information; a three-dimensional scanner is used to scan the subject to obtain human body shape parameter information; based on the human body sleeping posture characteristic action posture parameters, the digital human body model based on the human body shape parameter information is adjusted in posture to establish digital human body models under different sleeping posture characteristic action postures; mattress models corresponding to different attributes are constructed based on the basic parameters of the mattress; a human-bed coupling model is constructed based on the digital human body models under different sleeping posture characteristic action postures and the mattress models corresponding to different attributes; the human-bed coupling model is used to perform energy analysis on the behavior of human body sleeping posture change to evaluate the influence of different mattresses on the energy consumption of human body sleeping posture change. Through the above method, the influence of the mattress on the energy consumption of human body sleeping posture change can be accurately evaluated, and it is not restricted by a specific experimental site, which is convenient for application and popularization.

[0116] Refer to Figure 8 , Figure 8 This is the structural block diagram of the first embodiment of the evaluation device for the influence of the mattress of the present invention on the energy consumption of human body sleeping posture change.

[0117] As Figure 8As shown in the figure, the evaluation device for the influence of the mattress proposed in the embodiment of the present invention on the energy consumption of human body posture change includes:

[0118] A shooting module 10, configured to record the sleep behavior of a subject by using an infrared camera, obtain sleep behavior information, and extract human body posture characteristic action posture parameters from the sleep behavior information;

[0119] A scanning module 20, configured to scan the subject by using a three-dimensional scanner to obtain human body shape parameter information;

[0120] A construction module 30, configured to adjust the posture of a digital human body model based on the human body shape parameter information according to the human body posture characteristic action posture parameters, so as to establish digital human body models under different posture characteristic actions of the human body;

[0121] The construction module 30 is configured to construct mattress models corresponding to different attributes based on the basic parameters of the mattress;

[0122] The construction module 30 is configured to construct a human-bed coupling model based on the digital human body models under different posture characteristic actions of the human body and the mattress models corresponding to different attributes;

[0123] An evaluation module 40, configured to perform energy analysis on the human body posture change behavior by using the human-bed coupling model, so as to evaluate the influence of different mattresses on the energy consumption of human body posture change.

[0124] In this embodiment, an infrared camera is used to record the sleep behavior of a subject to obtain sleep behavior information, and human body posture characteristic action posture parameters are extracted from the sleep behavior information; a three-dimensional scanner is used to scan the subject to obtain human body shape parameter information; the posture of a digital human body model based on the human body shape parameter information is adjusted according to the human body posture characteristic action posture parameters to establish digital human body models under different posture characteristic actions of the human body; mattress models corresponding to different attributes are constructed based on the basic parameters of the mattress; a human-bed coupling model is constructed based on the digital human body models under different posture characteristic actions of the human body and the mattress models corresponding to different attributes; the human-bed coupling model is used to perform energy analysis on the human body posture change behavior to evaluate the influence of different mattresses on the energy consumption of human body posture change. Through the above method, the influence of the mattress on the energy consumption of human body posture change can be accurately evaluated, and it is not restricted by a specific experimental site, which is convenient for application and promotion.

[0125] In some embodiments, the selected wavelength of the infrared camera is greater than 900 nm, the sampling rate is 50 f / s, and the extracted human sleeping posture characteristic action posture parameters are the posture parameters corresponding to the characteristic actions of 0°, 15°, 30°, 45°, 60°, 75°, and 90° with the bed surface as the reference plane when the human body turns over.

[0126] In some embodiments, the construction module 30 is configured to obtain a digital human model in a closed standard template library format according to the human body shape parameter information;

[0127] Import the digital human model into 3D rendering software, and use skinning animation to bind the model mesh of the digital human model to a specific virtual human skeleton, and control the specific virtual human skeleton to move to drive the movement of the entire digital human model;

[0128] Repair and solid construct the digital human model through reverse engineering software to obtain digital human models in different sleeping posture characteristic action postures.

[0129] In some embodiments, the construction module 30 is configured to import the digital human models in different sleeping posture characteristic action postures and the mattress models corresponding to different attributes into finite element analysis software, and perform assembly in the assembly module to determine the positions of the models to obtain a human-bed coupling model. The mesh division unit of the mattress model corresponding to different attributes is a regular hexahedron unit, and the mesh division unit of the digital human model in different sleeping posture characteristic action postures is a tetrahedron unit. The contact type is set to surface-to-surface contact, and the bottom of the mattress model corresponding to different attributes is fixed, for the digital human model in different sleeping posture characteristic action postures.

[0130] In some embodiments, the evaluation module 40 is configured to analyze the interface pressure between the digital human model in different sleeping posture characteristic action postures and the mattress models corresponding to different attributes during the process of sleeping posture change by using finite element software based on the human-bed coupling model;

[0131] Convert the human-bed interface pressure into the human-bed interface depression amount according to the mattress material properties;

[0132] Select a torso and limb angle at a preset angular interval to perform simulation analysis on the human-bed interface depression amount, and obtain the dynamic simulation result of the human-bed interface depression amount during the whole process of sleeping posture change;

[0133] Perform energy analysis on the human sleeping posture change behavior according to the dynamic simulation result of the human-bed interface depression amount to evaluate the influence of different mattresses on the energy consumption during human sleeping posture change.

[0134] In some embodiments, the evaluation module 40 is configured to

[0135] Perform an energy analysis on the human body's sleeping posture change behavior based on the dynamic simulation results of the depression amount of the human-bed interface to obtain the strain energy of the mattress during the sleeping posture change, the energy consumed by the work done to overcome the change in the center of gravity of each part of the human body itself, and the energy consumption of the human body at rest;

[0136] Determine the total energy consumption based on the strain energy of the mattress, the energy consumed by the work done to overcome the change in the center of gravity of each part of the human body itself, and the energy consumption of the human body at rest;

[0137] Evaluate the impact of different mattresses on the energy consumption of human body sleeping posture change based on the total energy consumption.

[0138] In some embodiments, the strain energy of the mattress is obtained by converting the energy consumed by the human body doing work on the mattress, and is determined by the height of the mattress, the elastic modulus of the mattress material, the pressure, and the total pressure contact area. The energy consumed by the work done to overcome the change in the center of gravity of each part of the human body itself is determined by the change in the center of gravity height of each part of the human body, and the energy consumption of the human body at rest is determined by human body parameters.

[0139] The embodiment of the present application also provides an evaluation device for the impact of a mattress on the energy consumption of human body sleeping posture change, including a processor, a communication interface, a memory, and a communication bus. Among them, the processor, the communication interface, and the memory complete mutual communication through the communication bus. The memory is used to store the evaluation program for the impact of the mattress on the energy consumption of human body sleeping posture change; the processor is used to implement the above-mentioned evaluation method for the impact of the mattress on the energy consumption of human body sleeping posture change when executing the program stored on the memory.

[0140] The communication bus mentioned in the above evaluation device for the impact of a mattress on the energy consumption of human body sleeping posture change can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This communication bus can be divided into an address bus, a data bus, a control bus, etc.

[0141] The communication interface is used for communication between the above evaluation device for the impact of a mattress on the energy consumption of human body sleeping posture change and other devices.

[0142] The memory may include a Random Access Memory (RAM), or may also include a Non-Volatile Memory (NVM), such as at least one disk memory. Optionally, the memory may also be at least one storage device located far from the aforementioned processor.

[0143] The aforementioned processor may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0144] In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (such as coaxial cable, optical fiber, Digital Subscriber Line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or data center that includes one or more integrated available media. The available medium may be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a Solid State Disk (SSD)).

[0145] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0146] Each embodiment in this specification is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for the relevant parts, reference can be made to the description of the method embodiment.

[0147] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0148] It should be understood that the above is only an example for illustration and does not constitute any limitation to the technical solutions of the present invention. In specific applications, those skilled in the art can set according to needs, and the present invention does not make any restrictions in this regard.

[0149] It should be noted that the above-described work process is only illustrative and does not constitute a limitation to the protection scope of the present invention. In actual applications, those skilled in the art can select some or all of them according to actual needs to achieve the purpose of the embodiment solution, and no restrictions are made here.

[0150] In addition, for the technical details not described in detail in this embodiment, reference can be made to the method for evaluating the energy consumption impact of a mattress on the change of human sleeping postures provided in any embodiment of the present invention, and details will not be repeated here.

[0151] In addition, it should be noted that in this text, the terms "including", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or system including a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or system including such element.

[0152] The serial numbers of the above embodiments of the present invention are only for description and do not represent the superiority or inferiority of the embodiments.

[0153] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present invention, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as Read Only Memory (ROM) / RAM, magnetic disk, optical disk), and includes several instructions to enable a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.

[0154] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

[0155] It can be understood that the system provided by the embodiments of the present invention corresponds to the method provided by the embodiments of the present invention. For the explanations, examples and beneficial effects of the relevant content, reference can be made to the corresponding parts in the above methods.

Claims

1. A method for evaluating the impact of a mattress on energy consumption caused by changes in human sleeping posture, characterized in that: The method for evaluating the energy consumption effect of the mattress on the change of human sleeping posture includes: Using an infrared camera to record the sleep behavior of the subject, obtain sleep behavior information, and extract human sleeping posture characteristic movement posture parameters from the sleep behavior information; Scan the subject with a three-dimensional scanner to obtain the body shape parameter information; Based on the human body sleeping posture characteristic action posture parameters, a digital human body model based on the human body appearance parameter information is adjusted in posture to establish a digital human body model under different sleeping posture characteristic action postures; Build mattress models corresponding to different attributes based on the basic parameters of the mattress; Building a human-bed coupling model based on the digital human body models under the different sleeping posture characteristics and the mattress models corresponding to the different attributes; The human-bed coupling model is used to perform energy analysis on human sleeping posture change behavior to evaluate the energy consumption effects of different mattresses on human sleeping posture changes.

2. The method according to claim 1, characterized in that The selected wavelength of the infrared camera is greater than 900nm, the sampling rate is 50f / s, and the extracted characteristic posture parameters of the human sleeping posture are the posture parameters corresponding to the characteristic movements of 0°, 15°, 30°, 45°, 60°, 75° and 90° with the bed surface as the reference plane when the human body turns over.

3. The method according to claim 1, characterized in that The posture adjustment of the digital human body model based on the human body shape parameter information is performed based on the human body sleeping posture characteristic action posture parameters to establish the digital human body model under different sleeping posture characteristic action postures, including: Obtaining a digital human body model in a closed standard template library format according to the human body shape parameter information; Importing the digital human model into 3D rendering software, and using skinning animation to bind the model mesh of the digital human model to a specific virtual human skeleton, and controlling the specific virtual human skeleton to move, so as to drive the movement of the entire digital human model; The digital human body model is repaired and physically constructed by reverse engineering software to obtain digital human body models under different sleeping posture characteristics and action postures.

4. The method according to claim 1, characterized in that The method of constructing a human-bed coupling model based on the digital human body models under the different sleeping posture characteristics and the mattress models corresponding to the different attributes includes: The digitized human body models under the different sleeping posture characteristics and the mattress models corresponding to the different attributes are imported into the finite element analysis software, and assembled in the assembly module to determine the positions of the models to obtain the human-bed coupling model, the mesh division units of the mattress models corresponding to the different attributes are regular hexahedron units, the mesh division units of the digitized human body models under the different sleeping posture characteristics and action postures are tetrahedron units, the contact type is set to surface-to-surface contact, the bottom of the mattress models corresponding to the different attributes are fixed, and the digitized human body models under the different sleeping posture characteristics and action postures are assembled.

5. The method according to claim 1, characterized in that The energy analysis of the human-bed coupling model on the human sleeping posture change behavior is performed to evaluate the energy consumption effect of different mattresses on the human sleeping posture change, including: Analyzing the interface pressure between the digital human body model and the mattress model corresponding to different attributes under different sleeping posture characteristic action postures during the sleeping posture change process based on the human-bed coupling model using finite element software; The pressure on the human-bed interface is converted into the amount of sinking of the human-bed interface according to the material properties of the mattress; According to the preset angle interval, a trunk and limb angle is selected to simulate and analyze the sinking amount of the human bed interface, and a dynamic simulation result of the sinking amount of the human bed interface during the whole process of sleeping posture change is obtained; According to the dynamic simulation results of the human-bed interface sinking amount, energy analysis is performed on the human sleeping posture change behavior to evaluate the energy consumption effect of different mattresses on the human sleeping posture change.

6. The method according to claim 5, characterized in that The energy analysis of the human sleeping posture change behavior is performed according to the dynamic simulation result of the human-bed interface sinking amount to evaluate the energy consumption effect of different mattresses on the human sleeping posture change, including: According to the dynamic simulation result of the sinking amount of the human-bed interface, an energy analysis is performed on the human sleeping posture change behavior to obtain the strain energy of the mattress during the human sleeping posture change process, the energy consumed by the work done to overcome the change of the center of gravity of each part of the human body, and the resting energy consumption of the human body; Determine the total energy consumption according to the strain energy of the mattress, the energy consumed by the work done to overcome the change of the center of gravity of each part of the human body, and the energy consumed by the human body at rest; The energy consumption effects of different mattresses on changes in human sleeping posture are evaluated based on the total energy consumption.

7. The method according to claim 6, characterized in that The strain energy of the mattress is obtained by converting the energy consumed by the human body in doing work on the mattress, and is determined by the mattress height, the elastic modulus of the mattress material, the pressure, and the total pressure contact area. The energy consumed in overcoming the changes in the center of gravity of various parts of the human body is determined by the changes in the center of gravity height of various parts of the human body. The energy consumed by the human body at rest is determined by human body parameters.

8. A device for evaluating the impact of a mattress on energy consumption caused by changes in sleeping posture, characterized in that: The device for evaluating the energy consumption effect of a mattress on a change in a sleeping position of a human body comprises: A shooting module is used to record the sleep behavior of the subject using an infrared camera to obtain sleep behavior information, and to extract characteristic motion posture parameters of the human body's sleeping posture from the sleep behavior information; A scanning module is used to scan the subject using a three-dimensional scanner to obtain human body shape parameter information; A construction module, for adjusting the posture of a digital human body model based on the human body shape parameter information based on the human body sleeping posture characteristic action posture parameters, so as to establish a digital human body model under different sleeping posture characteristic action postures; The construction module is used to construct mattress models corresponding to different attributes based on basic parameters of the mattress; The construction module is used to construct a human-bed coupling model based on the digital human body models under the different sleeping posture characteristics and action postures and the mattress models corresponding to the different attributes; The evaluation module is used to use the human-bed coupling model to perform energy analysis on human sleeping posture change behavior, so as to evaluate the energy consumption effect of different mattresses on human sleeping posture change.

9. The device according to claim 8, characterized in that The selected wavelength of the infrared camera is greater than 900nm, the sampling rate is 50f / s, and the extracted characteristic posture parameters of the human sleeping posture are the posture parameters corresponding to the characteristic movements of 0°, 15°, 30°, 45°, 60°, 75° and 90° with the bed surface as the reference plane when the human body turns over.

10. The device according to claim 8, characterized in that The construction module is used to obtain a digital human body model in a closed standard template library format according to the human body shape parameter information; Importing the digital human model into 3D rendering software, and using skinning animation to bind the model mesh of the digital human model to a specific virtual human skeleton, and controlling the specific virtual human skeleton to move, so as to drive the movement of the entire digital human model; The digital human body model is repaired and physically constructed by reverse engineering software to obtain digital human body models under different sleeping posture characteristics and action postures.

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