Construction and testing of laminated fabric pressure distribution sensing system

Abstract

Abstract: With the development of the Internet of Things and sensing technology, people have designed a pressure distribution sensing system based on the fabric pressure sensing array, realized human-machine intelligent interaction, completed the measurement and analysis of the pressure distribution data of the human body or object, and applied it to the fields of attitude monitoring, classification and recognition. At present, the pressure distribution sensing system can be divided into wearable and non-wearable. Among them, the non-wearable pressure distribution sensing system does not need to be worn during use. It is convenient to integrate with other technologies and has high scalability. It is favored by many researchers and shows broad application prospects in intelligent medical treatment, rehabilitation nursing, and motion detection. However, the pressure distribution sensing system still faces many challenges in preparation and use, such as complex manufacturing process, difficult to achieve large-scale production, can only be used in fixed workplaces, and crosstalk effects.In order to facilitate the application of the pressure distribution sensing system to various occasions and reduce the crosstalk effect, a two-layer laminated fabric pressure sensing array is prepared in this paper. A laminated fabric pressure distribution sensing system is constructed by combining the fabric packaging layer and the data acquisition module. The fabric pressure sensing array is composed of two layers of substrate fabric, silver-plated conductive yarn and sensing unit. The upper layer of the substrate fabric is stitched with silver-plated conductive yarn at equal intervals in the weft direction and the lower layer of the substrate fabric in the warp direction, and the pressure-sensitive material is printed. The two layers of fabrics are stacked orthogonally with conductive yarns to form a sensing unit at the intersection of warp and weft conductive yarns. In order to facilitate the application of the fabric pressure sensing array to various occasions, it is encapsulated with a stacked fabric packaging layer to provide mechanical protection. The data acquisition module of the pressure distribution sensor array is designed to complete the data acquisition and upload, and a reasonable flexible circuit board is designed for the connection between the conductive yarn on the substrate fabric and the data acquisition module. The electrical and mechanical properties of the sensing unit of the fabric pressure distribution sensing system were experimentally studied, and the constructed fabric pressure distribution sensing system was tested. It is found that the reciprocal of the resistance value of the sensing unit is approximately linear with the pressure, and the piezoresistive response characteristics are good. After 500 cycles of pressure tests, the sensing unit can respond stably to external signals. Based on the collected data, the pressure distribution cloud map is drawn. Under four different conditions, the fabric pressure distribution sensing system can better present the distribution of the pressure applied by the measured object. The pressure sensing array with double-layer superimposed structure makes the initial state of each sensing unit in the system more consistent, which can effectively reduce the noise interference introduced by the series-parallel path between the sensing units. The system shows good application prospects in the fields of disease prevention, motion monitoring, fall detection and so on.

Key words: fabric pressure sensing array, iterative structure, pressure distribution, electrical performance, pressure contour

摘要： 为实现对人体或物体的压力分布特征的监测，构建了一种层叠式织物压力分布传感系统。该系统由织物压力传感阵列、封装织物层以及数据采集模块组成，织物压力传感阵列由两层基底织物对向叠放构成，其中沿上层基底织物底面纬向和下层基底织物顶面经向分别等间隔缝纫有镀银导电纱线并印刷压敏材料，在经向和纬向导电纱线的交会处形成传感单元。对织物压力分布传感系统的传感单元的电力学性能进行了实验研究，并对构建的织物压力分布传感系统进行了测试。结果表明：传感单元电阻值的倒数与压强近似呈线性关系，展现出良好的压阻响应特性；经过500次循环压力测试，传感单元可对外界信号作出稳定的响应；采用双层叠合结构的压力传感阵列使织物压力分布传感系统中各传感单元初始状态一致性较好，并有效减轻了传感单元之间因串并联通路而引入的噪声干扰，因此可较好地呈现被测物体所施加压力的分布特征。

关键词: 织物压力传感阵列, 叠合结构, 压力分布, 电力学性能, 压力云图

CLC Number:

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TP212.1

CHEN Junpeng, WANG Xiaodong, ZHANG Jikang, LV Peng, PEI Zeguang. Construction and testing of laminated fabric pressure distribution sensing system[J]. Advanced Textile Technology, 2024, 32(2): 9-17.

陈俊鹏, 王小东, 张积康, 吕鹏, 裴泽光. 层叠式织物压力分布传感系统的构建及测试[J]. 现代纺织技术, 2024, 32(2): 9-17.

References

[1]李润, 韩啸, 曾琦, 等. 便携式人体压力分布测量系统研制[J]. 机电技术, 2022, 45(3): 2-4.
LI Run, HAN Xiao, ZENG Qi, et al. Development of portable human body pressure distribution measurement system[J]. Mechanical & Electrical Technology, 2022, 45(3): 2-4.
[2]LI J, MA Q, CHAN A H, et al. Health monitoring through wearable technologies for older adults: Smart wearables acceptance model[J]. Applied Ergonomics, 2019, 75: 162-169.
[3]韩志清, 杨晓红, 邱昀梵, 等. 柔性压力传感器在智能纺织品中的应用[J]. 棉纺织技术, 2020, 48(4): 79-84.
HAN Zhiqing, YANG Xiaohong, QIU Yunfan, et al. Application of flexible pressure sensor in smart textiles[J]. Cotton Textile Technology, 2020, 48(4): 79-84.
[4]陈足娇, 张睿, 卓雯雯, 等. 可穿戴足底压力监测系统研究进展[J]. 纺织学报, 2021, 42(9): 31-38.
CHEN Zujiao, ZHANG Rui, ZHUO Wenwen, et al. Research progress of wearable plantar pressure monitoring system[J]. Journal of Textile Research ,2021, 42(9): 31-38.
[5]HUANG H G, SHAO R M, WANG C N, et al. Flexible, ultralight, ultrathin, and highly sensitive pressure sensors based on bacterial cellulose and silver nanowires[J]. Journal of Materials Science, 2022, 57(44): 20987-20998.
[6]LI H F, DING G F, YANG Z Q. A high sensitive flexible pressure sensor designed by silver nanowires embedded in polyimide (AgNW-PI)[J]. Micromachines, 2019, 10(3): 206.
[7]HU J S, YU J S, LI Y, et al. Nano carbon black-based high performance wearable pressure sensors[J]. Nanomaterials, 2020, 10(4): 664.
[8]COCHRANE C, KONCAR V, LEWANDOWSKI M, et al. Design and development of a flexible strain sensor for textile structures based on a conductive polymer composite[J]. Sensors, 2007, 7(4): 473-492.
[9]周瑶瑶, 汪慧安, 刘云, 等. 导电纤维用于可穿戴智能纺织品的研究进展[J]. 化纤与纺织技术, 2021, 50(10): 22-24.
ZHOU Yaoyao, WANG Huian, LIU Yun, et al. Research progress of conductive fibers for wearable smart textiles[J].Chemical Fiber & Textile Technology, 2021, 50(10): 22-24.
[10]PROESMANS R, VERLEYSEN A, VLEUGELS R, et al. Modular piezoresistive smart textile for state estimation of cloths[J]. Sensors, 2021, 22(1): 222.
[11]YAN C, GAO Y Y, ZHAO S L, et al. A linear-to-rotary hybrid nanogenerator for high-performance wearable biomechanical energy harvesting[J]. Nano Energy, 2020, 67: 104235.
[12]MAHMOUD K, SALAM S, E1-HADI H. Designing smart textiles prints with interactive capability[J]. Journal of Design Sciences and Applied Arts, 2020, 1(1): 96-107.
[13]LEE S, SHIN S, LEE S, et al. Ag nanowire reinforced highly stretchable conductive fibers for wearable electronics[J]. Advanced Functional Materials, 2015, 25(21): 3114-3121.
[14]YU A F, WANG W, LI Z B, et al. Large-scale smart carpet for self-powered fall detection[J]. Advanced Materials Technologies, 2020, 5(2): 1900978.
[15]王小东. 柔性织物压力传感系统构建与数据预处理方法研究[D]. 上海: 东华大学, 2023.
WANG Xiaodong. Research on the Construction of Flexible Fabric Pressure Sensing System and Data Preprocessing Method[D]. Shanghai: Donghua University, 2023.