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A method for measuring the surface depression value of flexible materials under the action of human body

A technology of flexible material and surface depression, applied in the direction of measuring device, using electrical device, using electromagnetic means, etc., can solve the problems of affecting the elasticity and stiffness of the structure, small stiffness, difficult depression value, etc.

Active Publication Date: 2019-03-22
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the materials used to make mattresses, seats, sofas, and shoes are mostly flexible materials, which not only have low rigidity, but also need to measure the depression of mattresses, seats, sofas, and shoes under the action of the human body under the cover of the human body. value is more difficult
If the displacement sensor device is embedded in the flexible material, it will inevitably destroy the overall structure of the flexible material, thereby affecting the elasticity and stiffness of the structure.

Method used

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  • A method for measuring the surface depression value of flexible materials under the action of human body
  • A method for measuring the surface depression value of flexible materials under the action of human body
  • A method for measuring the surface depression value of flexible materials under the action of human body

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Experimental program
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Effect test

Embodiment 1

[0114] The test pad 2 adopts a layer of transparent soft PVC, which has good flexibility. The test pad is placed on some flexible materials 3 such as seats or sofas to be tested, and it can be deformed in close contact with the flexible material 3. The surface of the strain gauge 1 is attached, and the method of attaching the strain gauge 1 is as follows: image 3 As shown, test its deformation. The strain gages are respectively pasted on the upper and lower surfaces of the transparent soft PVC at the same position along the x and y directions. The resistance value of the strain gauge is 120.0±1.0Ω, its correction coefficient is 2.04±1.0%, and its size is 8.0mm*3.0mm. The wiring is very thin, only 0.45mm in diameter. The specific test steps for the surface depression value of the flexible material 3 under the action of the human body are as follows:

[0115] 1) Concavity value Strain gauges are respectively pasted on the upper and lower surfaces of the same position of tran...

Embodiment 2

[0121] According to the method principle of embodiment one, the flexible material of the test object in embodiment two is a mattress, and the specific steps are:

[0122] 1) Concavity value The strain gauges are attached to the upper and lower surfaces of the mattress at the same position along the x and y directions respectively, and the distances between the strain gauges along the x and y directions are Δx=80mm and Δy=80mm respectively, as Figure 7 As shown (the solid points in the figure are strain gauges, and the hollow points are fictitious points calculated for the finite difference method), here the strain gauges are pasted with 9 pieces in each row along the x direction, and 24 pieces are pasted on one side along the y direction. Attach strain gauges 9×24×2=432 pieces.

[0123] 2) The sag value uses a wire with a diameter of only 0.45mm and a small resistance to connect the strain gauge to the static strain gauge DH3818-2 (Jiangsu Donghua Testing Technology Co., Ltd....

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Abstract

The invention discloses a method of measuring the surface indentation value of a flexible material under the action of a human body. The method comprises the steps that strain gauges are pasted on the upper surface and the lower surface of a PVC cushion respectively in the x direction and the y direction, the strain gauges and tenuous wires are welded through an electric soldering iron, and thus a strain gauge array is formed; the strain gauge array is in 1 / 4 bridging connection with a static strain indicator through a tenuous wire; the PVC cushion is laid on the flexible material to be tested; the human body acts on the flexible material, testing is conducted through the strain gauge array, and the strain of each strain gauge is recorded through the static strain indicator and saved; the strain is solved based on the finite difference method and the overdetermined linear equation system, and the surface indentation value of the flexible material is obtained. The surface indentation value of the flexible material under the action of the human body is accurately measured with the method, and the method is suitable for measuring the indentation values of mattresses, sofas and shoe sole moulds under the action of the human body, provides a basis for curvature design of seats and shoes and soft and hard partition design of mattresses and meets the personal demand for comfort.

Description

technical field [0001] The invention relates to a displacement measurement method, which belongs to the technical field of measurement, in particular to the technical field of measurement of surface depression values ​​of flexible materials (such as mattresses, seat cushions or backrests, shoes and boots, etc.) under the action of the human body. Background technique [0002] Flexible materials (such as: mattresses, seat cushions or backrests, shoes and boots, etc.) are closely related to people's basic necessities of life. When buying a car, the comfort of the seat is also more and more valued; when buying soft materials, seats, sofas and other upholstered furniture, the comfort is the primary factor for buyers to buy; when buying shoes, shoes Whether the boots can fit the feet well and give the human body more reasonable support. Manufacturers and designers must continue to innovate and improve comfort in order to have a place in the fierce competition in the market. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/02
CPCG01B7/02
Inventor 袁鸿吴嘉瑜张苗李善倾
Owner JINAN UNIVERSITY
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