CN116124439B - System for researching pressure measurement and fitting comfort of skiing helmet - Google Patents
System for researching pressure measurement and fitting comfort of skiing helmet Download PDFInfo
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- CN116124439B CN116124439B CN202310389821.8A CN202310389821A CN116124439B CN 116124439 B CN116124439 B CN 116124439B CN 202310389821 A CN202310389821 A CN 202310389821A CN 116124439 B CN116124439 B CN 116124439B
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- A—HUMAN NECESSITIES
- A42—HEADWEAR
- A42B—HATS; HEAD COVERINGS
- A42B3/00—Helmets; Helmet covers ; Other protective head coverings
- A42B3/04—Parts, details or accessories of helmets
- A42B3/0406—Accessories for helmets
- A42B3/0433—Detecting, signalling or lighting devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
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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
- G01M13/00—Testing of machine parts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
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Abstract
The invention provides a system for researching pressure measurement and fitting comfort of a skiing helmet, which comprises the following components: an inflatable annular pressure belt, an annular pressure measuring device, a communication device and intelligent equipment; the inflatable annular pressure belt is made of flexible materials, and after being worn by a tester, the inflatable annular pressure belt is inflated by using a balloon type inflating device, so that the pressure belt is inflated to generate pressure on the head; the annular pressure measuring device measures pressure values at different positions of the head circumference; the communication device transmits the pressure value to the intelligent equipment; the intelligent equipment displays a top view of the head circumference to a tester, and the tester inputs subjective feelings at different measuring positions of the top view according to the self-fitting comfort feeling; and calculating and analyzing the pressure value and the subjective feeling to obtain the quantitative corresponding relation of the subjective feeling of the pressure and the fitting comfort of the skiing helmet, so as to provide required data support for accurate type selection and special customization of the skiing helmet. The invention can provide the needed data support for the accurate model selection and the special customization of the skiing helmet.
Description
Technical Field
The invention relates to the technical field of sports equipment, in particular to a system for researching pressure measurement and fitting comfort of a skiing helmet.
Background
Skiing sports are at high risk. Ski helmets play an important role in reducing the rate and severity of head injuries and injuries to the head of a player. However, due to the difference of head shapes and head circumferences of people with different sexes, ages and the like, the pressure and comfort of the different people caused by different tightness degrees of the helmet have different feeling threshold values and tolerance ranges. In order to provide both optimum protection and comfort to the skier, the ski helmet and liner should be as well fitted as possible to the head shape of the wearer and provide a suitable degree of tightness so that the wearer will not come loose and shift during high speed, high impact skiing movements. To ensure both protection and comfort, it is desirable to measure and study the pressure and comfort applied by the ski helmet to the head of the skier as accurately as possible, providing data support for accurate sizing and design development of the ski helmet.
Disclosure of Invention
The invention provides a system for researching the pressure measurement and fitting comfort of a skiing helmet, which is used for providing required data support for accurate selection and special customization of the skiing helmet. The technical scheme is as follows:
a system for studying pressure measurement and fit comfort of a ski helmet is provided, the system comprising: an inflatable annular pressure belt, an annular pressure measuring device, a communication device and intelligent equipment;
the inflatable annular pressure belt is made of flexible materials and is used for automatically controlling inflation by using the balloon type inflation device after being worn by a tester, so that the inflation pressure of the pressure belt is increased, and the pressure is generated on the head;
the annular pressure measuring device is used for measuring pressure values at different positions of the periphery of the head when the inflatable pressure belt expands and applies pressure to the head;
the communication device is used for transmitting the pressure value measured by the annular pressure measurement device to the intelligent equipment;
the intelligent equipment is used for displaying a top view of the head circumference to the tester, and the tester inputs subjective feelings at different measuring positions shown in the top view according to the self fitting comfort feeling;
the intelligent equipment is also used for carrying out calculation and analysis on the pressure value and the subjective feeling to obtain a quantitative corresponding relation between the pressure of the skiing helmet and the subjective feeling of the fitting comfort, so as to provide required data support for accurate model selection and special customization of the skiing helmet.
Optionally, the tester wears the inflatable annular pressure belt along the outer edge of the head orbit ear line and fixes the inflatable annular pressure belt and then wears the skiing helmet, the tester uses a balloon type inflating device connected with the pressure belt to autonomously control the inflation of the pressure belt, the pressure belt expands in a gap between the skiing helmet and the head to generate pressure on the head, the pressure belt gradually increases the pressure on the head, and when the pressure is large and the head generates uncomfortable feeling, the tester autonomously controls to stop the inflation or reduce the pressure so as to avoid causing pressure damage on the head.
Optionally, the inflatable annular pressure belt is customized to a plurality of different sizes according to the approximate diameter range of the head circumference of people of different sexes or ages to meet the needs of different people.
Alternatively, the annular pressure measuring device is implemented using a pressure sensor fixed to a side of the inflatable annular pressure band in contact with the head of the tester, and measures pressure values at different positions around the head when the pressure band generates pressure.
Optionally, the annular pressure measuring device is implemented by using a sheet-shaped pressure sensor or a plurality of point-shaped pressure sensors, and the sheet-shaped pressure sensor is an integral body and is attached and fixed on one side of the inflatable annular pressure belt, which is contacted with the head of the tester; the plurality of point-shaped pressure sensors are fixed on one side of the inflatable annular pressure belt, which is contacted with the head of the tester, and are distributed at different positions of the head circumference.
Optionally, when the pressure value is increased, the tester expresses the fitting comfort of different degrees according to the subjective feeling description method designed by the test, and selects the corresponding subjective feeling options on the display interface of the intelligent device.
Optionally, the intelligent device is specifically configured to:
defining the subjective perception options as a non-quantitative variable sequence, and converting the non-quantitative variable sequence into corresponding quantized qualitative variables
；
Calculating all pressure actual measurement values with fitting comfort at different measurement positions as' fitting
And the comfort zone where it is located +.>
；
Subjective feeling of "fit" before and after different zones of optimal comfort
And->
Determining the pressure value +.>And
is a regression model of (2);
and according to the regression model of each interval, calculating the pressure tolerance conditions of different testers.
Optionally, the intelligent device is specifically configured to:
the actual pressure values at different measuring positions and the subjective feeling of being 'fit' are formed into vectors
；
According to the vector
The liner thickness of the ski helmet is tailored along the trend of the orbitals to create a ski helmet pressure that meets the head circumference characteristics of the tester, providing the tester with optimal protection and comfort.
Optionally, the intelligent device is specifically configured to:
at each test, the sex of tester i was recorded
Age->
Information, and the actual pressure value at different measuring positions when said subjective perception is "fitting")>
Forming a data vector for each tester
According to the data of a plurality of testers, a clustering algorithm is adopted to obtain the distribution characteristics of the fitting comfortableness of different crowd groups and the characteristic values thereof, so that the skiing helmet is customized for a specific crowd, and the optimal protection and comfortableness are provided for skiers of the specific crowd.
Optionally, the intelligent device is specifically configured to:
(a) Assuming k tester crowd groups, from n of the data vectors
In i=1, 2, n, k vectors are arbitrarily chosen as the center vector for each group, respectively +.>
，/>
，...，/>
；
(b) Separately computing each remaining data vector
Distance from each center vector +.>
，i=1,2，...，n-k；j=1，2，...，k；
(c) Each data vector
The number of vectors in each group allocated to the nearest group is +.>
，/>
，...，/>
；
（d）Recalculating the center vectors of the k groups
Wherein->
Is the i-th vector in this group, of which there is + ->
A vector; />
J=1, 2, for the total number of vectors contained in the j-th group;
(e) Recalculating new group center vectors
And the original center vector->
Distance of->
If distance->
Or less than the set threshold, the flow is ended after convergence; if->
Or greater than the set threshold, iterating from (b) to (d) until the distance +.>
Or less than a set threshold;
(f) Determining a final group center vector, and finding the gender, age characteristic value and pressure of different crowd groups according to the final group center vector
Characteristic values for customizing a ski helmet for a specific population, for carrying skiers for a specific populationFor optimal protection and comfort.
The technical scheme provided by the invention has the beneficial effects that at least:
1) The invention can synchronously collect subjective feeling of the skiing helmet on the pressure data of the outer edge of the orbit ear line of the head of the tester and the fitting comfort of the tester.
2) The invention can calculate the quantitative corresponding relation between the pressure data of the outer edge of the orbit ear line of the head of the tester and the subjective feeling of the fitting comfort of the tester, and provides data support for accurate selection and special customization of the ski helmet.
3) The invention can subjectively feel different areas before and after 'fitting' in optimal comfort
And->
Determining the pressure value +.>
And->
Is a regression model of (2); and according to the regression model of each interval, calculating the pressure tolerance conditions of different testers.
4) The invention forms the actual pressure values which are 'fit' with the subjective feeling at different measuring positions into vectors
The method comprises the steps of carrying out a first treatment on the surface of the According to the vector->
The liner thickness of the ski helmet is tailored along the trend of the orbitals to create a ski helmet pressure that meets the head circumference characteristics of the tester, providing the tester with optimal protection and comfort.
5) The invention can calculate and research the clustering characteristics of factors such as different sexes, ages and the like and the optimal fitting comfort pressure value in large-sample-size crowd so as to find out different user group characteristic values and the optimal fitting comfort pressure characteristic value thereof, and is used for customizing the skiing helmet suitable for specific crowd and providing optimal protection and comfort for skiers of the specific crowd.
6) The invention can control the pressure applied by the helmet by the tester independently so as to ensure the safety during testing.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a system for studying the pressure measurement and fit comfort of a ski helmet according to an embodiment of the present invention;
fig. 2 is a schematic view of a head orbit ear line position according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of an inflatable annular pressure band provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of measurement points for measuring pressure and fit comfort along a head circumference line, as provided by an embodiment of the present invention;
fig. 5 is a schematic illustration of the relationship between helmet pressure and fit comfort provided by an embodiment of the present invention.
Detailed Description
As shown in fig. 1, an embodiment of the present invention provides a system for studying pressure measurement and fit comfort of a ski helmet, the system comprising: an inflatable annular pressure band 110, an annular pressure measurement device 120, a communication device 130, and an intelligent appliance 140;
the inflatable annular pressure belt is made of flexible materials and is used for automatically controlling inflation by using the balloon type inflation device after being worn by a tester, so that the inflation pressure of the pressure belt is increased, and the pressure is generated on the head;
the annular pressure measuring device is used for measuring pressure values at different positions of the periphery of the head when the inflatable pressure belt expands and applies pressure to the head;
the communication device is used for transmitting the pressure value measured by the annular pressure measurement device to the intelligent equipment;
the intelligent equipment is used for displaying a top view of the head circumference to the tester, and the tester inputs subjective feelings at different measuring positions shown in the top view according to the self fitting comfort feeling;
the intelligent equipment is also used for carrying out calculation and analysis on the pressure value and the subjective feeling to obtain a quantitative corresponding relation between the pressure of the skiing helmet and the subjective feeling of the fitting comfort, so as to provide required data support for accurate model selection and special customization of the skiing helmet.
As shown in fig. 2, since the left and right sides of the outer edge of the head orbit ear line (temporal bone lepidoptera) are thin, the temporal muscle attached to the head is protected; the main sensory nerves of the trigeminal head and face are also distributed nearby and are sensitive to the pressure generated by the helmet. Along the orbital canal section, there are also more joints between different craniums where there is also a greater risk of skull damage. In addition, when people exercise and exert force, teeth biting actions are generated, temporal muscles are tensed, temporal muscle tension is increased, shortening and thickening are carried out, pressure is also increased, and pressure pain is more easily generated when the helmet is worn. Therefore, the embodiment of the invention adopts an inflatable annular pressure belt, and is worn and fixed along the outer edge of the orbit ear line of the cross section of the head as shown in fig. 3, and then a skiing helmet is worn, so that pressure data are measured; the tester controls the air pressure of the pressure belt autonomously, the pressure belt expands, and pressure is applied to the head along the outer edge of the orbit ear line; fixing an annular pressure measurement device between the inflatable pressure band and the head; the testers input subjective feelings of fitting comfort through intelligent equipment according to the subjective feelings; the intelligent device performs quantitative analysis of corresponding relation on the recorded pressure value and subjective feeling of fitting comfort so as to study the pressure and fitting comfort of the helmet.
Optionally, the tester wears the inflatable annular pressure belt along the outer edge of the head orbit ear line and fixes the inflatable annular pressure belt and then wears the skiing helmet, the tester uses a balloon type inflating device connected with the pressure belt to autonomously control the inflation of the pressure belt, the pressure belt expands in a gap between the skiing helmet and the head to generate pressure on the head, the pressure belt gradually increases the pressure on the head, and when the pressure is large and the head generates uncomfortable feeling, the tester autonomously controls to stop the inflation or reduce the pressure so as to avoid causing pressure damage on the head.
Alternatively, the balloon inflator connected to the pressure belt is similar to that of a sphygmomanometer.
Optionally, the inflatable annular pressure belt is customized to a plurality of different sizes according to the approximate diameter range of the head circumference of people of different sexes or ages to meet the needs of different people.
Alternatively, the annular pressure measuring device is implemented using a pressure sensor fixed to a side of the inflatable annular pressure band in contact with the head of the tester, and measures pressure values at different positions around the head when the pressure band generates pressure.
Optionally, the annular pressure measuring device is implemented by using a sheet-shaped pressure sensor or a plurality of point-shaped pressure sensors, and the sheet-shaped pressure sensor is an integral body and is attached and fixed on one side of the inflatable annular pressure belt, which is contacted with the head of the tester; the plurality of point-shaped pressure sensors are fixed on one side of the inflatable annular pressure belt, which is contacted with the head of the tester, and are distributed at different positions of the head circumference.
The on-chip pressure sensor is integrated, but can extract pressure data at different positions around the head according to requirements.
The plurality of point-shaped pressure sensors can be uniformly distributed around the head circumference as shown in fig. 4, and can be not uniformly distributed around the head circumference according to the specific conditions of different positions of the head circumference, and the specific distribution conditions are not limited by the embodiment of the invention and are all within the protection scope of the embodiment of the invention.
The communication device may be a wireless or wired communication device, and is configured to transmit the pressure value measured by the annular pressure measurement device to the intelligent device.
Optionally, when the pressure value is increased, the tester expresses the fitting comfort of different degrees according to the subjective feeling description method designed by the test, and selects the corresponding subjective feeling options on the display interface of the intelligent device.
For example, "fit" may be defined as best subjective perception of comfort, with varying degrees of fit comfort being expressed in terms of "very loose", "looser", "loose fit", "snug fit", "tighter", "tight", "very tight". Of course, other similar comfort expressions may be adopted, and the embodiments of the present invention are not limited to specific expressions, and are all within the scope of the embodiments of the present invention.
The intelligent device can be a touch intelligent device or the mouse operation is an intelligent device, the embodiment of the invention is not limited to a specific intelligent device type, and the touch intelligent device is preferred for the convenience of operation of testers within the protection scope of the embodiment of the invention.
Optionally, the intelligent device is specifically configured to:
defining the subjective perception options as a non-quantitative variable sequence, and converting the non-quantitative variable sequence into corresponding quantized qualitative variables
；
For example, the choice of fit comfort subjective perception may be defined as a sequence of variables that is not quantitative
Calculating all pressure actual measurement values with fitting comfort at different measurement positions as' fitting
And the comfort zone where it is located +.>
；
As shown in fig. 5, the relationship between the measured pressure value and the corresponding subjective feeling converted value of the fitting comfort at different time points at a certain measurement point is shown.
Subjective feeling of "fit" before and after different zones of optimal comfort
And->
Determining a pressure value
Is a regression model of (2);
and according to the regression model of each interval, calculating the pressure tolerance conditions of different testers.
For example, some testers have strong pressure tolerance, the pressure is increased greatly, the testers still feel comfortable, and the comfort interval is wider; some testers have poor pressure tolerance, so that the pressure is slightly increased, the testers generate uncomfortable feeling, and the comfortable interval is narrow; some testers prefer a tighter feel and dislike a looser feel, so that the tight comfort zone is wider and the looser comfort zone is narrower. According to the regression model, the pressure tolerance conditions of different testers can be counted to obtain some rules.
According to the need
Is used to determine the specific type of regression model, which may be a lineA linear regression model, a linearized curve regression model or a nonlinear regression model, typically a linear relationship of the two. However, this linear intercept and slope are different for different testers.
Linear regression models, e.g.
The method comprises the steps of carrying out a first treatment on the surface of the Linearized curve regression models, e.g. logarithmic function modelsInverse function model->
Conic model->
Third-degree curve model->
Power function model->
Composite function model->
S-shaped curve function model->
The method comprises the steps of carrying out a first treatment on the surface of the Wherein->
Is a regression coefficient; nonlinear regression models, generally labeled as a function +.>
J=1, 2,..n, wherein
Regression coefficient vector for->
Is a random error.
Optionally, the intelligent device is specifically configured to:
the actual pressure values at different measuring positions and the subjective feeling of being 'fit' are formed into vectors
；
According to the vector
The liner thickness of the ski helmet is tailored along the trend of the orbitals to create a ski helmet pressure that meets the head circumference characteristics of the tester, providing the tester with optimal protection and comfort.
For example, pressure at a measurement location along the orbital aural line
The pressure is larger, so that a tester can feel comfortable when the pressure is tighter, and the thickness of the lining of the skiing helmet can be thickened; pressure at measuring position along orbital line +.>
The lower pressure, which means less pressure, is more relaxed and the tester feels comfortable, so that the thickness of the lining of the skiing helmet can be reduced.
Optionally, the intelligent device is specifically configured to:
at each test, the sex of tester i was recorded
Age->
Information, and the actual pressure value at different measuring positions when said subjective perception is "fitting")>
Forming a data vector for each tester
According to the data of a plurality of testers, a clustering algorithm is adopted to obtain the distribution characteristics of the fitting comfortableness of different crowd groups and the characteristic values thereof, so that the skiing helmet is customized for a specific crowd, and the optimal protection and comfortableness are provided for skiers of the specific crowd.
Optionally, the intelligent device is specifically configured to:
(a) Assuming k crowd groups, from n of the data vectors
In i=1, 2, n, k vectors are arbitrarily chosen as the center vector for each group, respectively +.>
，/>
，...，/>
；
(b) Separately computing each remaining data vector
Distance from each center vector +.>
，i=1,2，...，n-k；j=1，2，...，k；
(c) Each data vector
The number of vectors in each group allocated to the nearest group is +.>
，/>
，...，/>
；
(d) Recalculating the center vectors of the k groups
Wherein->
Is the i-th vector in this group, of which there is + ->
A vector; />
J=1, 2, for the total number of vectors contained in the j-th group;
(e) Recalculating new group center vectors
And the original center vector->
Distance of->
If distance->
Or less than the set threshold, the flow is ended after convergence; if->
Or greater than the set threshold, iterating from (b) to (d) until the distance +.>
Or less than a set threshold;
(f) Determining a final group center vector, and finding the gender, age characteristic value and pressure of different crowd groups according to the final group center vector
Characteristic values for customizing the ski helmet for a specific population, providing optimal protection and comfort for the skiers of the specific population.
For example, for children, it is particularly desirable to study the relationship between pressure and fit comfort for a child ski helmet, to customize the ski helmet for the child, to provide optimal protection and comfort for the child skier, due to factors such as incomplete development of their skull. According to the embodiment of the invention, a plurality of child testers can be divided into different category groups, for example, six categories, namely 3-6 years old boys, 3-6 years old girls, 6-9 years old boys, 6-9 years old girls, 9-12 years old boys and 9-12 years old girls, the distribution characteristics and the characteristic values of the fitting comfortableness of each group category are respectively found out by adopting the clustering algorithm of the embodiment of the invention, and the skiing helmets can be customized for the children of the six group categories according to the distribution characteristics and the characteristic values thereof, so that the optimal protection and comfortableness are provided for the child skiers.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (9)
1. A system for studying the pressure measurement and fit comfort of a ski helmet, the system comprising: an inflatable annular pressure belt, an annular pressure measuring device, a communication device and intelligent equipment;
the inflatable annular pressure belt is made of flexible materials and is used for automatically controlling inflation by using the balloon type inflation device after being worn by a tester, so that the inflation pressure of the pressure belt is increased, and the pressure is generated on the head;
the annular pressure measuring device is used for measuring pressure values at different positions of the periphery of the head when the inflatable annular pressure belt expands and applies pressure to the head;
the communication device is used for transmitting the pressure value measured by the annular pressure measurement device to the intelligent equipment;
the intelligent equipment is used for displaying a top view of the head circumference to the tester, and the tester inputs subjective feelings at different measuring positions shown in the top view according to the self fitting comfort feeling;
the intelligent equipment is also used for carrying out calculation and analysis on the pressure value and the subjective feeling to obtain a quantitative corresponding relation between the pressure of the ski helmet and the subjective feeling of the fitting comfort, so as to provide required data support for accurate ski helmet selection and special customization;
the intelligent device is specifically configured to:
defining the subjective perception options as a qualitative variable sequence and converting the qualitative variable sequence into corresponding quantized variables
Is a sequence of (2);
calculating all pressure actual measurement values with fitting comfort at different measurement positions as' fitting
And the comfort zone where it is located +.>
；
Subjective feeling of "fit" before and after different zones of optimal comfort
<0 and->
∈0, determining the pressure value +.>
Is a regression model of (2);
and according to the regression model of each interval, calculating the pressure tolerance conditions of different testers.
2. The system of claim 1, wherein the inflatable annular pressure band is worn by the tester and fixed along the outer edge of the orbit ear line of the head and the ski helmet is worn by the tester, the tester uses a balloon type inflating device connected with the pressure band to autonomously control the inflation of the pressure band, the pressure band is inflated in a gap between the ski helmet and the head to generate pressure on the head, the pressure band is gradually increased to generate pressure on the head, and the tester autonomously controls to stop the inflation or reduce the pressure when the pressure is larger and the head generates uncomfortable feeling, so as to avoid pressure damage on the head.
3. The system of claim 1, wherein the inflatable annular pressure band is customized to a plurality of different sizes according to the range of diameters of the head circumference of people of different sexes or ages to meet the needs of different people.
4. The system of claim 1, wherein the annular pressure measuring device is implemented using a pressure sensor fixed to a side of the inflatable annular pressure band that contacts the head of the tester, and measuring pressure values at different locations around the head when the pressure band generates pressure.
5. The system of claim 4, wherein the annular pressure measuring device is implemented using a sheet-like pressure sensor or a plurality of point-like pressure sensors, the sheet-like pressure sensor being one piece and being snugly secured to the side of the inflatable annular pressure band that contacts the tester's head; the plurality of point-shaped pressure sensors are fixed on one side of the inflatable annular pressure belt, which is contacted with the head of the tester, and are distributed at different positions of the head circumference.
6. The system according to claim 1, wherein the tester expresses different degrees of fitting comfort according to the method for describing subjective feeling designed by the test when the pressure value is increased, and selects the corresponding subjective feeling option on the display interface of the intelligent device.
7. The system according to claim 1, characterized in that the smart device is further adapted in particular to:
the actual pressure values at different measuring positions and subjective feeling of being 'fit' are formed into a sequence
；
According to the sequence
The liner thickness of the ski helmet is tailored along the trend of the orbitals to create a ski helmet pressure that meets the head circumference characteristics of the tester, providing the tester with optimal protection and comfort.
8. The system according to claim 1, characterized in that the smart device is further adapted in particular to:
at each test, the sex of tester i was recorded
Age->
Information, and the actual pressure at different measuring positions when said subjective perception is "fitting")>
Forming the data sequence of each tester +.>
According to the data of a plurality of testers, a clustering algorithm is adopted to obtain the distribution characteristics of the fitting comfortableness of different crowd groups and the characteristic values thereof, so that the skiing helmet is customized for a specific crowd, and the optimal protection and comfortableness are provided for skiers of the specific crowd.
9. The system according to claim 8, characterized in that the smart device is further adapted in particular to:
(a) Assuming k groups of tester populations, from n of the data sequences
In i=1, 2,..n, k sequences are arbitrarily chosen as central sequences for each group, respectively +.>
，/>
，...，/>
；
(b) Separately computing each remaining data sequence
Distance from each center sequence +.>
，i=1,2，...，n-k；j=1，2，...，k；
(c) Each data sequence
Assigned to the nearest group, the number of sequences in each group is respectively
；
(d) Recalculating the group center sequence of k groups
=/>
Wherein->
Is the ith sequence in the group with +.>
A sequence; />
J=1, 2, for the total number of sequences contained in the j-th group;
(e) Recalculating new group center sequences
And the protocenter sequence->
Distance of->
I=1, 2,..n-k; if distance->
=0 or less than the set threshold, then convergence has already occurred, and the flow ends; if->
>0 or greater than the set threshold, iterating from (b) to (d) until the distance +.>
=0 or less than a set threshold;
(f) Determining a final group center sequence, and finding the gender, age characteristic value and pressure of different crowd groups according to the final group center sequence
Characteristic values for specific personsThe custom-made ski helmets provide optimal protection and comfort for the skiers of a particular population.
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|---|---|---|---|---|
| KR100654223B1 (en) * | 2005-07-28 | 2006-12-06 | 재단법인서울대학교산학협력재단 | An apparatus for measuring pressure and evaluating the degree of comfort on wearing a cap |
| CN103230276A (en) * | 2013-02-01 | 2013-08-07 | 上海中医药大学附属岳阳中西医结合医院 | Device and method for quantitatively evaluating and recording human body subjective feeling |
| GB2550411B (en) * | 2016-05-20 | 2019-04-03 | Hp1 Tech Ltd | Device for detecting a force |
| CN108563862B (en) * | 2018-04-11 | 2022-03-11 | 歌尔光学科技有限公司 | Method and system for establishing standard checking model of wearing comfort of VR (virtual reality) head-mounted equipment |
| CN109840379A (en) * | 2019-01-31 | 2019-06-04 | 东华大学 | A kind of construction method of chest gather effect and brassiere pressure comfort relationship |
| CN112998341B (en) * | 2021-02-08 | 2022-10-04 | 重庆第二师范学院 | Self-adaptive inflatable helmet and manufacturing method thereof |
| CN115810341A (en) * | 2022-11-23 | 2023-03-17 | 腾讯科技（深圳）有限公司 | Audio synthesis method, apparatus, device and medium |
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