填充物的力学性能对坐垫舒适性影响的仿真分析

摘要/Abstract

摘要： 将经编间隔织物和不同密度的海绵材料作为坐垫的填充物，通过分析坐垫上的人体体压分布情况，深入探讨坐垫的整体舒适度。首先，选择中密度海绵（28 kg/cm³）、高密度海绵（50 kg/cm³）及新型弹性材料经编间隔织物，对其进行力学性能进行实验。随后，采用有限元仿真法，对三种材料分别进行单轴压缩仿真，分析得出拟合度最高的本构模型；对经编间隔织物材料进行微元变形仿真，分析该材料变形量、压强、厚度三者关系的数学模型。最后，建立弹性坐垫和中国50百分位男性的人体臀部（软组织+骨骼）仿真复合模型，分析臀部与垫面的体压分布数据，并利用体压测试仪验证仿真数据的有效性。结果发现：中密度海绵、高密度海绵及经编间隔织物在仿真分析后体压-应变拟合度最高（为99.24%）的本构模型选低密度泡沫较合适；可经过MATLAB进行二次多项式拟合得出经编间隔织物的变形量、压强、厚度三者之间的数学模型；经编间隔织物弹性坐垫垫面的峰值比中密度海绵弹性坐垫垫面的体压峰值大，比高密度海绵弹性坐垫垫面的体压峰值小，整体垫面体压分布情况较海绵坐垫更均匀；体压测试仪验证仿真数据与实际测试数据小于5%，表明仿真实验的可行性。研究表明，经编间隔织物比海绵材料具有更好的支撑性和压力舒适性。这些实验结果的数据以及虚实结合的方法可为未来弹性坐垫产品的材料选择及开发模式提供参考。

关键词: 经编间隔织物, 有限元, 力学性能, 本构模型, 体压分布, 微元变形

Abstract: Based on the background that the majority of the population spends more time in a seated position and the demand for cushion products is increasing, the selection of cushion products with a high level of comfort has become the focus of consumer attention. In this paper, for the 50th percentile male representative group in China, three kinds of materials, namely warp-knitted spacer fabrics, sponges with a medium density of 28 kg/cm³, and sponges with a high density of 50 kg/cm³ were selected as the filler of cushion products to obtain three kinds of cushion materials.
We explored the mechanical characteristics of the three types of materials and the methodology and effectiveness of finite element simulation, and established relevant material microelement models to assist design prediction. The results show that the intrinsic model with the highest compression-strain fit (99.24%) among sponges with a medium density of 28 kg/cm³, sponges with a high density of 50 kg/cm³ and warp-knitted spacer fabrics is LOW DENSITY FOAM. Meanwhile, the mathematical model of the relationship between deformation of warp-knitted spacer fabrics and the amount of compression force applied, as well as the thickness of the material was obtained by using the quadratic polynomial surface fitting of MATLAB.
Subsequently, the process of contact between human body and three different cushion products in sitting posture was simulated by finite element simulation in ABAQUS software to analyze the comfort of the products according to the distribution of body pressure on the cushion surface, and the validity of the simulation experiments was verified by using a body pressure tester. It is found that the peak value of the elastic cushion surface of the warp-knitted spacer fabric is larger than that of the elastic cushion surface of sponges with a medium density of 28 kg/cm³, and smaller than that of the elastic cushion surface of sponges with a high density of 50 kg/cm³, and the distribution of the overall cushion surface is more homogeneous than that of the sponge cushion; and the body pressure tester verifies that the simulation data are less than 5% of the actual test data, which proves the feasibility of the simulation experiment.
Warp-knitted spacer fabrics exhibit better support and breathability than sponge materials. Combined with the results of objective data analysis, it is believed that as these materials continue to evolve, they can provide more choices for future elastic cushion products.

Key words: warp-knitted spacer fabric, finite element, mechanical properties, constitutive model, pressure distribution, micro-element deformation

中图分类号:

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TS195.644

肖珂莹, 崔思怡, 林少武, 王雪琴. 填充物的力学性能对坐垫舒适性影响的仿真分析[J]. 现代纺织技术, 2024, 32(4): 21-28.

XIAO Keying, CUI Siyi, LIN Shaowu, WANG Xueqin, . Simulation analysis of the influence of mechanical properties of fillers on cushion comfort[J]. Advanced Textile Technology, 2024, 32(4): 21-28.

参考文献

[1] RAIJMAKERS B G, NIEUWENHUIZEN M G, BECKERMAN H, et al. Differences in the course of daily activity level between persons with and without chronic pain[J]. American Journal of Physical Medicine & Rehabilitation, 2015, 94(2): 110-113.
[2] 张鑫, 陶毓博, 李鹏. 座具坐垫舒适性的客观评价分析[J]. 家具与室内装饰, 2019(5): 30-31.
ZHANG Xin, TAO Yubo, LI Peng. Review on the objective evaluation and analysis of the comfortability of seat cushion[J]. Furniture & Interior Design, 2019(5): 30-31.
[3] 徐伟, 程洛林, 杨国庆, 等. 海绵密度对沙发坐垫舒适性影响分析[J]. 家具, 2018, 39(4): 17-21.
XU Wei, CHENG Luolin, YANG Guoqing, et al. The influence of sponge density on the comfort of sofa cushions[J]. Furniture, 2018, 39(4): 17-21.
[4] DANGAL S, SMULDERS M, VINK P. Implementing spring-foam technology to design a lightweight and comfortable aircraft seat-pan[J]. Applied Ergonomics, 2021,91: 103-174.
[5] LEE J, FERRAIUOLO P. Seat comfort[C]//International Congress & Exposition. 1993. DOI:10.4271/910191.
[6] HUANG S, ZHANG Z, XU Z, et al. Modeling of human model for static pressure distribution prediction[J]. International Journal of Industrial Ergonomics, 2015, 50: 186-195.
[7] 雷鹏, 付志强, 张蕾, 等. 基于 Abaqus 低密度泡沫模型的 EPE 冲击仿真模拟[J]. 塑料科技, 2019, 47(9): 89-94.
LEI Peng, FU Zhiqiang, ZHANG Lei, et al. Simulation of EPE impact based on Abaqus low-density foam model[J]. Plastics Science and Technology, 2019, 47(9): 89-94.
[8] CHEN S, WANG X, SUN M, et al. Supine dynamic simulation and latex pillow design for Chinese women based on finite element method[J]. Textile Research Journal, 2022, 92(13/14): 2529-2537.
[9] GRUJICIC M, PANDURANGAN B, ARAKERE G, et al. Seat-cushion and soft-tissue material modeling and a finite element investigation of the seating comfort for passenger-vehicle occupants[J]. Materials & Design, 2009, 30(10): 4273-4285.
[10] 白晓鹏, 丁智平, 唐先贺, 等. 微孔聚氨酯弹性材料的力学性能研究[J]. 湖南工业大学学报, 2014, 28(6): 32-37.
BAI Xiaopeng, DING Zhiping, TANG Xianhe, et al. Mechanical properties of microporous polyurethane elastomers[J]. Journal of Hunan University of Technology, 2014, 28(6): 32-37.
[11] 陈顺微, 厉纯纯, 孙梦情, 等. 天然乳胶泡沫材料压缩形变的数值模拟[J]. 现代纺织技术, 2022, 30(5): 60-66.
CHEN Shunwei, LI Chunchun, SUN Mengqing, et al. Numerical simulation of compression deformation of natural latex foam[J]. Advanced Textile Technology, 2022, 30(5): 60-66.
[12] 赵银娇. 基于多孔结构的坐垫设计与舒适度研究[D].上海: 东华大学, 2022: 31-40.
ZHAO Yinjiao. Research on Cushion Design and Comfort Based on Porous Structure [D]. Shanghai: Donghua University, 2022: 31-40.
[13] 丁沫丹, 王金凤, 陈慰来. 经编间隔织物基柔性材料压缩性能研究[J]. 针织工业, 2023(5): 11-15.
DING Modan, WANG Jinfeng, CHEN Weilai. Research on compression properties of warp-knitted spacer fabric-based flexible materials[J]. Knitting Industries, 2023(5): 11-15.
[14] 王恒. 基于中国人体特征的参数化人体体表模型建模研究[D]. 烟台: 烟台大学, 2020: 24-29.
WANG Heng. Research on Parameterized Human Body Surface Modeling Based on China's Human Body Characteristics[D]. Yantai University, 2020: 24-29.
[15] YANG L, WANG X Q, DENG Q N. Customized design of insoles for pressure relief via FEM[J]. Engineering Village, 2022(347): 172-181.
[16] 金晓萍, 袁向科, 王波, 等. 汽车泡沫坐垫舒适性的客观评价方法[J]. 汽车工程, 2012, 34(6): 551-555.
JIN Xiaoping, YUAN Xiangke, WANG Bo, et al. The objective evaluation method of automotive foam cushion comfort[J]. Automotive Engineering, 2012, 34(6): 551-555.