CN111855250A - Evaluation method for comfort level of seat surface of bamboo deck chair - Google Patents

Evaluation method for comfort level of seat surface of bamboo deck chair Download PDF

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CN111855250A
CN111855250A CN202010750889.0A CN202010750889A CN111855250A CN 111855250 A CN111855250 A CN 111855250A CN 202010750889 A CN202010750889 A CN 202010750889A CN 111855250 A CN111855250 A CN 111855250A
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seat surface
bamboo
comfort
leg
hip
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程意斐
周鸿�
朱通
朱芋锭
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00—Subject matter not provided for in other groups of this subclass
    • G01M99/001—Testing of furniture, e.g. seats or mattresses
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C1/00—Chairs adapted for special purposes
    • A47C1/02—Reclining or easy chairs

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Abstract

The invention discloses an evaluation method of comfort level of a seat surface of a bamboo reclining chair, which is characterized in that the seat surface of the bamboo reclining chair is divided into a leg seat surface, a hip seat surface, a back seat surface and a head seat surface according to the contact part of a human body; then acquiring the angle between the leg seat surface and the horizontal plane, and acquiring the angle between the back seat surface and the horizontal plane; then calculating the weight of the legs, the buttocks, the back and the head of the user according to the proportion to obtain the pressure borne by a leg seat surface, a buttocks seat surface and a back seat surface; and finally, calculating the bending deflection of the bamboo strips in the hip seat surface according to the bending elastic modulus of the bamboo strips, the pressure on the hip seat surface, the width of the bamboo strips, the cross-sectional moment of inertia and the distance between the ischia and the edges of the bamboo strips, and evaluating the comfort degree according to the value of the bending deflection. The invention can evaluate the comfort of the bamboo reclining chair, thereby facilitating the subsequent improvement and optimization of the structure of the bamboo reclining chair and fully meeting the requirement of sitting comfort.

Description

Evaluation method for comfort level of seat surface of bamboo deck chair
Technical Field
The invention relates to the field of bamboo chair performance test, in particular to a method for evaluating comfort level of a seat surface of a bamboo deck chair.
Background
The chair is a seat with a chair back and armrests. Ancient people sit on the ground without chairs, and the 'chair' originally is a wooden name. The "Shijing" has a tung chair and a "chair" is a name of a tree. Classifying according to materials: solid wood chairs, glass chairs, iron art chairs, plastic chairs, bamboo chairs, etc.
Taking a bamboo chair as an example, as is well known, bamboo strips are easy to obtain, have large plasticity, sufficient and cheap raw materials and short growth period, so that the bamboo chair is a new choice for people who advocate the environment protection to regard as fashionable home furnishing. Among them, the bamboo reclining chairs in the bamboo chairs have generally been accepted in the market, and more people select the bamboo reclining chairs for a little sweet at work or a time of a repair. However, the existing bamboo reclining chair has poor softness and comfort, does not conform to human sitting posture engineering, and makes people feel uncomfortable after sitting for a long time. Therefore, how to evaluate the comfort of the bamboo reclining chair from the aspect of ergonomics becomes a problem to be solved by the applicant for the subsequent improvement and optimization of the bamboo reclining chair.
Disclosure of Invention
The invention aims to provide an evaluation method for comfort of a seat surface of a bamboo reclining chair. The invention can evaluate the comfort of the bamboo reclining chair, thereby facilitating the subsequent improvement and optimization of the structure of the bamboo reclining chair and fully meeting the requirement of sitting comfort.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a method for evaluating comfort level of a seat surface of a bamboo reclining chair is characterized in that the overall curve of the seat surface of the bamboo reclining chair is made of long bamboo chips, arc lines formed by bending the long bamboo chips after high-temperature heating are utilized to smooth a transition leg included angle and form an arc headrest part, a plurality of cuboid bamboo battens are arranged among the long bamboo chips side by side, and the seat surface is formed among the bamboo battens; the method comprises the following steps:
a. the seat surface is divided into a leg seat surface, a hip seat surface, a back seat surface and a head seat surface according to the contact part of a human body; acquiring the angle between a leg seat surface and a horizontal plane, and acquiring the angle between a back seat surface and the horizontal plane;
b. calculating the weight of the legs, the buttocks, the back and the head of the user according to a proportion, and obtaining the pressure borne by a leg seat surface, a buttocks seat surface and a back seat surface;
c. and calculating the bending deflection of the bamboo strips in the hip seat surface according to the bending elastic modulus of the bamboo strips, the pressure borne by the hip seat surface, the width of the bamboo strips, the cross-sectional moment of inertia and the distance between the ischia and the edges of the bamboo strips, and evaluating the comfort degree according to the value of the bending deflection.
In the method for evaluating the comfort level of the bamboo deck chair seat, in the step b, the weights of the legs, the buttocks, the back and the head of the user are calculated according to the proportion of 0.222:0.342:0.355: 0.081.
In the step b, the maximum pressure which can be borne by the leg seat surface, the hip seat surface, the back seat surface and the head seat surface is calculated according to the static bending strength and the width of the bamboo strips, so as to ensure the firmness of the bamboo reclining chair.
In the method for evaluating comfort of a seat surface of a bamboo reclining chair, the bending deflection is calculated as follows:
Figure BDA0002610022230000021
in the formula: wcIs the bending deflection, F is the pressure on the seat surface of the buttocks, l is the width of the bamboo strip, E is the elastic modulus, and I is the section moment of inertia; b is the distance between the ischia and the edge of the bamboo strip;
for a rectangular cross-sectional moment of inertia:
Figure BDA0002610022230000031
in the formula: b' is a rectangular width; h is the rectangular height;
thus, it is possible to provide
Figure BDA0002610022230000032
In the step c, the comfort evaluation is that the bending deflection of the bamboo strips in the hip seat surface is a comfort interval which is 5-10% of the length of the bamboo strips.
Compared with the prior art, the invention divides the seat surface of the bamboo reclining chair into a leg seat surface, a hip seat surface, a back seat surface and a head seat surface according to the contact part of a human body; then acquiring the angle between the leg seat surface and the horizontal plane, and acquiring the angle between the back seat surface and the horizontal plane; then calculating the weight of the legs, the buttocks, the back and the head of the user according to the proportion to obtain the pressure borne by a leg seat surface, a buttocks seat surface and a back seat surface; and finally, calculating the bending deflection of the bamboo strips in the hip seat surface according to the bending elastic modulus of the bamboo strips, the pressure on the hip seat surface, the width of the bamboo strips, the cross-sectional moment of inertia and the distance between the ischia and the edges of the bamboo strips, and evaluating the comfort degree according to the value of the bending deflection. Therefore, the invention obtains the relation between human engineering and the bamboo reclining chair by a stress analysis method, then obtains the specific value of bending deflection, and reasonably divides the comfort degree of the bamboo reclining chair according to the value of the bending deflection, thereby evaluating the comfort of the bamboo reclining chair, facilitating the subsequent improvement and optimizing the structure of the bamboo reclining chair, and fully meeting the requirement of sitting comfort. In addition, the invention provides the proportional relation among the weights of all parts of the user, and the pressures borne by the leg seat surface, the hip seat surface and the back seat surface can be accurately obtained according to the proportional relation, so that the ergonomic requirement is met, and the subsequent bending deflection calculation result is more accurate; the invention also calculates the maximum pressure born by the leg seat surface, the hip seat surface, the back seat surface and the head seat surface in advance according to the static bending strength and the width of the bamboo strips, so as to ensure the firmness of the bamboo reclining chair and improve the safety performance of the bamboo reclining chair.
Drawings
FIG. 1 is a schematic view of a bamboo lounge chair;
FIG. 2 is a graph of the overall seating surface of a bamboo lounge chair;
FIG. 3 is a schematic view of a hip seat size configuration;
FIG. 4 is a bamboo recliner force diagram.
Detailed Description
The present invention will be further described with reference to the following examples and drawings, but the present invention is not limited thereto.
Example 1: a method for evaluating comfort level of a seat surface of a bamboo reclining chair is characterized in that an overall curve of the seat surface of the bamboo reclining chair is made of 2 long bamboo chips, and the included angle of legs of a transition body and a headrest part forming an arc shape are smoothed by utilizing an arc line formed by bending the long bamboo chips after high-temperature heating, so that each part of a human body can be supported in different degrees; a plurality of cuboid bamboo battens are arranged among the long bamboo chips side by side, the bamboo battens are moso bamboo green chips, the length is 420mm, the width is 20mm, the height is 5mm, and seat surfaces are formed among the bamboo battens; the method comprises the following steps:
a. the seat surface is divided into a leg seat surface, a hip seat surface, a back seat surface and a head seat surface according to the contact part of a human body; acquiring the angle between a leg seat surface and a horizontal plane, and acquiring the angle between a back seat surface and the horizontal plane;
b. calculating the weight of the legs, the buttocks, the back and the head of the user according to a proportion, and obtaining the pressure borne by a leg seat surface, a buttocks seat surface and a back seat surface;
c. and calculating the bending deflection of the bamboo strips in the hip seat surface according to the bending elastic modulus of the bamboo strips, the pressure borne by the hip seat surface, the width of the bamboo strips, the cross-sectional moment of inertia and the distance between the ischia and the edges of the bamboo strips, and evaluating the comfort degree according to the value of the bending deflection.
Example 2: a method for evaluating comfort level of a seat surface of a bamboo reclining chair comprises the steps that as shown in figure 1, the overall curve of the seat surface of the bamboo reclining chair is made of 2 long bamboo chips, and the included angle of a transition leg and a headrest part forming an arc shape are smoothed by utilizing an arc line formed by bending the long bamboo chips after high-temperature heating, so that each part of a human body can be supported in different degrees; the height of the pedals is 220mm, the width is 420mm, the length is 475mm, the height of the stool legs is 430mm, the width is 420mm, the length is 510mm, the height of the handrails is 604mm, and the height of the seat surface of the buttocks is 334 mm; the method comprises the following steps:
a. as shown in fig. 2, the seat surface is divided into a leg seat surface, a hip seat surface, a back seat surface and a head seat surface according to the contact portion of the human body, the total length of the four seat surfaces is 1260mm, and the distance between the hip seat surface and the head seat surface is 378 mm; obtaining the angle between the leg seat surface and the horizontal plane as 16 degrees and the angle between the back seat surface and the horizontal plane as 30 degrees; the included angle between the leg seat surface and the back seat surface is 134 degrees;
b. the maximum pressure which can be borne by a leg seat surface, a hip seat surface, a back seat surface and a head seat surface is calculated according to the static bending strength and the width of the bamboo splints, so that the firmness of the bamboo reclining chair is ensured; in the analysis process, a male of 75kg is assumed as the user, the weight of the male is selected from 95 th percentile of 18-60 years old (GB10000-1988), the weight of the legs, buttocks, back and head of the user is calculated according to the proportion of 0.222:0.342:0.355:0.081, the bending strength MOR of the moso bamboo green sheet is 221.64MP, as shown in figure 3, the buttocks seat surface is taken as an example, the buttocks seat surface is composed of 4 bamboo strips, the distance b between the ischia and the edge of the bamboo strips is 132.5mm, according to the pressure formula:
Figure BDA0002610022230000061
in the formula, P is the pressure intensity of the contact surface, F is the pressure applied to the contact surface, and S is the contact area;
calculating the pressure intensity on the hip seat surface, and meeting the requirement of S × MOR > P; the dimensions and ultimate loads of the various parts of the bamboo lounge chair body are finally obtained as shown in table 1:
body part Leg part Buttocks part Back part Head part
Horizontal length 300mm 80mm 730mm 50mm
Angle of rotation 16° 0° 30° 0°
Length of contact 300mm 80mm 421mm 50mm
Width of 420mm 420mm 420mm 420mm
Area (mm)2) 126000 33600 306600 21000
Ultimate load 3.8×106N 2.5×105N 6.9×106N 9.8×104N
TABLE 1
As shown in fig. 4, the pressures applied to the leg seat surface, the hip seat surface and the back seat surface are calculated according to the mechanical equation; wherein, the approximate weight of each part of the body is shown in table 2:
body part Leg part Buttocks part Back part Head part
Weight ratio of 0.222 0.342 0.355 0.081
Gravity force 166.5N 256.5N 266.25N 60.75N
Seat surface pressure 160.056N 256.5N 230.573N 60.75N
Resultant force Is free of 335.89N Is free of Is free of
TABLE 2
c. Calculating the bending deflection of the bamboo splints in the hip seat surface according to the bending elastic modulus of the bamboo splints, the pressure on the hip seat surface, the width of the bamboo splints, the cross-sectional moment of inertia and the distance between the ischia and the edge of the bamboo splints, and evaluating the comfort degree according to the value of the bending deflection;
the bending elastic modulus of the bamboo strip made of the moso bamboo green sheet is 16.63Gpa, and the bending deflection is calculated as follows:
Figure BDA0002610022230000071
in the formula: wcIs the bending deflection, F is the pressure on the seat surface of the buttocks, l is the width of the bamboo strip, 0.42m, E is the elastic modulus, and I is the section moment of inertia; b is the distance between the ischia and the edge of the bamboo strip, and is 0.1325 m;
for a rectangular cross-sectional moment of inertia:
Figure BDA0002610022230000072
in the formula: b' is the rectangle width 0.02 × 4 ═ 0.8 m; h is the height of the rectangle 0.005 m;
thus, it is possible to provide
Figure BDA0002610022230000073
The bending deflection of the hip seat surface of the bamboo reclining chair is 30.71mm when the resultant vertical loading force of the hip seat surface is 335.89N.
In the embodiment, by means of questionnaire survey and pressure data calculation, the angle between the leg seat surface and the horizontal plane of the bamboo reclining chair is randomly adjusted by 100 adults on the bamboo reclining chair, the angle between the back seat surface and the horizontal plane is obtained, and the subjective evaluation result of the tested person on the comfort level of each bamboo reclining chair is obtained, wherein the comfort level evaluation is that the bending deflection of bamboo strips in the hip seat surface is 5% -10% of the length of the bamboo strips and is taken as a comfort interval, then the subjective evaluation result is input into Yaahp software for calculation, so that the weight of the influence degree of the leg seat surface, the hip seat surface, the back seat surface and the head seat surface on the comfort level is obtained, the mean value, the variance of a data set and the contribution degree of the square sum of the three parameters to the comfort level are also obtained. Table 3 shows the weight of each seating surface in the comfort evaluation result.
Figure BDA0002610022230000081
TABLE 3
The comfort model is as follows:
Figure BDA0002610022230000082
in the formula: xi、Yi、ZiRespectively representing the mean, the variance and the square sum of each difference of the set of differences in the ith region, wi1、wi2、wi3Respectively represent the mean, the variance of the difference value set in the ith area, the square of each difference value and the weight of three parameters.
After obtaining the comfort model, the applicant performed 9 sets of experiments respectively by obtaining three angles of 12 °, 16 °, and 18 ° between the leg seat surface and the horizontal plane and obtaining three angles of 28 °, 30 °, and 33 ° between the back seat surface and the horizontal plane, to obtain different bending deflections at different angles of the leg seat surface and the horizontal plane and at different angles of the back seat surface and the horizontal plane as shown in table 4, and performed comfort scores according to the comfort model.
Figure BDA0002610022230000091
TABLE 4
From the table 4, it can be seen that different bending deflection values are obtained at different angles between the leg seat surface and the horizontal plane and different angles between the back seat surface and the horizontal plane, and when the angle between the leg seat surface and the horizontal plane and the angle between the back seat surface and the horizontal plane are all at reasonable angles, and the bending deflection of the bamboo strips in the hip seat surface of the bamboo reclining chair is 5-10% of the length of the bamboo strips, the bamboo strips are all in a comfort zone, and meanwhile, the score of the comfort model is higher, and when the bending deflection value is not in the zone, the score of the comfort model is lower, so that the invention has accurate comfort evaluation capability.
In conclusion, the invention obtains the relation between human engineering and the bamboo reclining chair by a stress analysis method, then obtains the specific value of bending deflection, and reasonably divides the comfort degree of the bamboo reclining chair according to the value of the bending deflection, thereby evaluating the comfort of the bamboo reclining chair, facilitating subsequent improvement and optimizing the structure of the bamboo reclining chair, and fully meeting the requirement of sitting comfort.

Claims (5)

1. A method for evaluating comfort level of a seat surface of a bamboo reclining chair is characterized in that the overall curve of the seat surface of the bamboo reclining chair is made of long bamboo chips, arc lines formed by bending the long bamboo chips after high-temperature heating are utilized to smooth a transition leg included angle and form an arc headrest part, a plurality of cuboid bamboo battens are arranged among the long bamboo chips side by side, and the seat surface is formed among the bamboo battens; the method is characterized in that: the method comprises the following steps:
a. the seat surface is divided into a leg seat surface, a hip seat surface, a back seat surface and a head seat surface according to the contact part of a human body; acquiring the angle between a leg seat surface and a horizontal plane, and acquiring the angle between a back seat surface and the horizontal plane;
b. calculating the weight of the legs, the buttocks, the back and the head of the user according to a proportion, and obtaining the pressure borne by a leg seat surface, a buttocks seat surface and a back seat surface;
c. and calculating the bending deflection of the bamboo strips in the hip seat surface according to the bending elastic modulus of the bamboo strips, the pressure borne by the hip seat surface, the width of the bamboo strips, the cross-sectional moment of inertia and the distance between the ischia and the edges of the bamboo strips, and evaluating the comfort degree according to the value of the bending deflection.
2. The method of evaluating comfort of a bamboo lounge chair seat according to claim 1, wherein: in step b, the weight of the user's legs, buttocks, back and head is calculated in a ratio of 0.222:0.342:0.355: 0.081.
3. The method of evaluating comfort of a bamboo lounge chair seat according to claim 1, wherein: in the step b, the maximum pressure born by the leg seat surface, the hip seat surface, the back seat surface and the head seat surface is calculated according to the static bending strength and the width of the bamboo splints, so that the firmness of the bamboo reclining chair is ensured.
4. The method of evaluating comfort of a bamboo lounge chair seat according to claim 1, wherein: the bending deflection is calculated as:
Figure FDA0002610022220000021
in the formula: wcIs the bending deflection, F is the pressure on the seat surface of the buttocks, l is the width of the bamboo strip, E is the elastic modulus, and I is the section moment of inertia; b is the distance between the ischia and the edge of the bamboo strip;
for a rectangular cross-sectional moment of inertia:
Figure FDA0002610022220000022
in the formula: b' is a rectangular width; h is the rectangular height;
thus, it is possible to provide
Figure FDA0002610022220000023
5. The method of evaluating comfort of a bamboo lounge chair seat according to claim 1, wherein: in the step c, the comfort evaluation is that the bending deflection of the bamboo strips in the hip seat surface is a comfort interval which is 5-10% of the length of the bamboo strips.
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Application publication date: 20201030