CN100388906C - Human body centre-of gravity dynamic position measuring instrument and its measuring method - Google Patents

Human body centre-of gravity dynamic position measuring instrument and its measuring method Download PDF

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CN100388906C
CN100388906C CNB2006100432477A CN200610043247A CN100388906C CN 100388906 C CN100388906 C CN 100388906C CN B2006100432477 A CNB2006100432477 A CN B2006100432477A CN 200610043247 A CN200610043247 A CN 200610043247A CN 100388906 C CN100388906 C CN 100388906C
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cover plate
extension board
human body
given value
numerical value
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CN1830390A (en
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单信海
林明星
单洪标
徐庆幸
刘赛堂
郭修奎
杜英杰
管志光
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Shandong Normal University
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Abstract

The present invention relates to a dynamic position measuring instrument and a measuring method for the gravity center of a human body, which comprises a force measuring platform, a pressure sensor, a data collection card and a PC computer, wherein the force measuring platform is composed of a cover plate, an extension plate and attaching plates. The cover plate is hinged with one end of the extension plate, and the lower surface of the other end of the extension plate is provided with a supporting pole of the extension plate. The lower surfaces of both ends of the cover plate are respectively provided with four supporting poles of the cover plate. The pressure sensor is arranged between the supporting poles of the cover plate and the cover plate. The pressure sensor and the cover plate are in point contact. Both sides of the cover plate and the extension plate are respectively and movably connected with the attaching plates. The pressure sensor is connected with the data collection card and the PC computer by lines. When the present invention is used, distributed loads of a plurality of supporting poles of the force measuring platform are tested and calculated by the pressure sensor. The real-time dynamic measurement of the position of the gravity center of the human body is realized by data collection, A/D conversion, weaving data processing and drawing printing software. The present invention has the advantages of multiple function, convenient carrying, and simple and reliable structure.

Description

Gravity center of human body's dynamic position measuring instrument and measuring method thereof
Technical field
The present invention relates to a kind of dynamometry instrument, specifically a kind of gravity center of human body's dynamic position measuring instrument and measuring method thereof.
Background technology
We know that coming the variation (equilibrium function) of testing human position of centre of gravity with mechanical platform at present is a kind of method in common, and force plate/platform has the small-sized platform of three fulcrums, four fulcrums, and the large-area platform of six fulcrums.The mentality of designing of these instruments mainly is the measurement for the position of human center (centre-of-pressure position) under human body stance (stand or the walk) condition, and do not consider detection under the human prone position condition, the function ratio of instrument is more single, carries also inconvenience very simultaneously.
Summary of the invention
The present invention is for overcoming above-mentioned the deficiencies in the prior art, provide a kind of simple in structure, easy to operate, be easy to carry about with one, multi-functional gravity center of human body's dynamic position measuring instrument and measuring method thereof.
The objective of the invention is to adopt following technical proposals to realize: a kind of gravity center of human body's dynamic position measuring instrument, it includes force plate/platform, pressure transducer, data collecting card and PC computer, described force plate/platform is by cover plate, extension board and attached plate are formed, one end of cover plate and extension board is hinged, be provided with an extension board support column below the extension board other end, be provided with four cover plate support columns below the cover plate two ends altogether, between cover plate support column and cover plate, be provided with pressure transducer, point contact between pressure transducer and the cover plate, both sides at cover plate and extension board are connected with attached plate respectively, and pressure transducer is connected with the PC computer with data collecting card by circuit.
The dynamic change measuring method of position of centre of gravity is as follows under the human body walking state:
A. hinged cover plate and extension board;
When b. walking along X direction, when human body is come on the extension board, consider that extension board stablizes area characteristics triangular in shape, require human body as far as possible along the centrage walking of extension board, simultaneously the distance of walking is carried out suitable control, terminal point will be apart from extension board support column one segment distance, its length is about 1/3 of extension board length, simultaneously when walking, walking speed should remain a constant speed as far as possible, exerts an influence with the detection to position of human center of the inertia force of eliminating human body;
C. it is as follows to calculate principle: suppose that cover plate length is AB, extension board length is BC, and its width all is DE, under the condition of known person body weight G, and in the AB-BC direction, i.e. X-direction, when position of human center moves to x, from the AB direction, the pressure F that A is ordered ABe cover plate A side two pressure transducer numerical value sums, belong to given value; The pressure F that B is ordered BFor cover plate B side two pressure sensor numerical value sums, also belong to given value; The numerical value F of point C cSize equals human body weight G and deducts F AAnd F B, also be given value; Lateral separation L when between each support column of test platform a, L bWhen known, according to the equilibrated relation of x yawning moment, C gets square to fulcrum, can get: ∑ M C=0:F A* (L a+ L b)+F B* L b-G * (L a+ L b-x)=0, x=L then a+ L b-F A* (L a+ L b)/G-F B* L b/ G can determine position of centre of gravity x value; Equally, in the DE direction, i.e. Y direction, when the gravity center of human body moves to y, from the DE direction, the pressure F that D is ordered DBe the numerical value sum of cover plate D side two sensors, belong to given value, the pressure F that E is ordered ENumerical value sum for cover plate E side two sensors also belongs to given value; Point C is positioned at the mid point of 2 of D, E, when human body weight is given value G, and the numerical value F that C is ordered CSize equals G and deducts F DAnd F E, also be given value, the fore-and-aft distance L when between the cover plate support column of test platform CWhen known,, the D point is got square: ∑ M according to the equilibrated relation of y yawning moment D=0:F C* 0.5 * L c+ F E* L c-G * y=0, then y=(0.5 * F C+ F E) * L c/ G, wherein F C=G-F D-F ECan determine position of centre of gravity y value;
D. utilize pressure transducer, distributed load is tested and is calculated to many support columns of force plate/platform, and by data acquisition, A/D conversion, organized data is handled and the drawing print software, realizes the real time dynamic measurement of position of human center.
The dynamic change measuring method of position of centre of gravity is as follows under the human prone position state:
A. hinged cover plate and extension board, and flexibly connect attached plate respectively in its both sides;
When b. prone position was measured, human body should be sat down from cover plate, slowly lie down then and after move, head can be supported on the extension board support column place of extension board, launches the attached plate that is connected with cover plate, can increase the Area of bearing of the lateral rotation of lower limb under the human prone position state; The attached plate that expansion is connected with extension board, the Area of bearing in the time of can increasing the lateral movement of human prone position state lower arms;
C. it is as follows to calculate principle: suppose that cover plate length is AB, extension board length is BC, and its width all is DE, under the condition of known person body weight G, and in the AB-BC direction, i.e. X-direction, when position of human center moves to x, from the AB direction, the pressure F that A is ordered ABe cover plate A side two pressure transducer numerical value sums, belong to given value; The pressure F that B is ordered BFor cover plate B side two pressure sensor numerical value sums, also belong to given value; The numerical value F of point C CSize equals human body weight G and deducts F AAnd F B, also be given value; Lateral separation L when between each support column of test platform a, L bWhen known, according to the equilibrated relation of x yawning moment, C gets square to fulcrum, can get: ∑ M C=0:F A* (L a+ L b)+F B* L b-G * (L a+ L b-x)=0, x=L then a+ L b-F A* (L a+ L b)/G-F B* L b/ G can determine position of centre of gravity x value; Equally, in the DE direction, i.e. Y direction, when the gravity center of human body moves to y, from the DE direction, the pressure F that D is ordered DBe the numerical value sum of cover plate D side two sensors, belong to given value, the pressure F that E is ordered ENumerical value sum for cover plate E side two sensors also belongs to given value; Point C is positioned at the mid point of 2 of D, E, when human body weight is given value G, and the numerical value F that C is ordered CSize equals G and deducts F DAnd F E, also be given value, the fore-and-aft distance L when between the cover plate support column of test platform cWhen known,, the D point is got square: ∑ M according to the equilibrated relation of y yawning moment D=0:F C* 0.5 * L c+ F E* L c-G * y=0, then y=(0.5 * F C+ F E) * L c/ G, wherein F C=G-F D-F E, can determine position of centre of gravity y value;
D. utilize pressure transducer, distributed load is tested and is calculated to many support columns of force plate/platform, and by data acquisition, A/D conversion, organized data is handled and the drawing print software, realizes the real time dynamic measurement of position of human center.
The present invention adopts cover plate and extension board hinged, and connect attached plate respectively in its both sides, be respectively equipped with the cover plate support column of band pressure transducer below the cover plate two ends, pick off be a contact with being connected of cover plate, causes statically indeterminate mechanical structure to avoid producing moment in the junction.Cover plate can use separately, and the position of centre of gravity when human body is stood under stance with testing human rocks (balanced capacity).Be provided with the extension board support column below the extension board other end, pressure transducer is connected with the PC computer with data collecting card by circuit.During use, human body walk in the above or prone position under can calculate position of centre of gravity according to the equalising torque principle.Utilize pressure transducer, distributed load is tested and is calculated to many support columns of force plate/platform, and by data acquisition, A/D conversion, organized data is handled and the drawing print software, realizes the real time dynamic measurement of position of human center.Advantage of the present invention is:
(1) function is many, and the dynamic change of center of gravity in the time of both can having tested human body under the stance and stand or walk again can be to the Changing Pattern of position of human center under the prone position (because of the variation of extremity causes);
(2) be convenient for carrying, can disassembled and assembled freely between attached plate and cover plate and the extension board;
(3) with 5 fulcrums, the method for 4 pick offs had both enlarged the effective area of test, was solving the structure statically indeterminate problem on the mechanics on the theory and practice, had reduced the quantity of pick off simultaneously again, and the Mechatronic Systems structure is become simply, reliably.The present invention can be used as the selection of athletic training, motion, also can be for nationwide physical condition detect, and aspect services such as medical rehabilitation.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the stressed sketch map of force plate/platform X direction of the present invention;
Fig. 3 is the stressed sketch map of force plate/platform y direction of the present invention;
Fig. 4 is a schematic block circuit diagram of the present invention.
1. cover plates among the figure, 2. extension board, 3. attached plate, 4. cover plate support column, 5. extension board support column.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
Embodiment: structure as shown in Figure 1, force plate/platform is made up of cover plate 1, extension board 2 and attached plate 3, one end of cover plate 1 and extension board 2 is hinged, be provided with an extension board support column 5 below extension board 2 other ends, be respectively equipped with four cover plate support columns 4 below cover plate 1 two ends, between cover plate support column 4 and cover plate 1, be provided with pressure transducer, point contact between pressure transducer and the cover plate 1, be connected with attached plate 3 respectively in the both sides of cover plate 1 and extension board 2, pressure transducer is connected with the PC computer with data collecting card by circuit.
When cover plate 1 was connected with extension board 2, the present invention can measure the dynamic change of position of centre of gravity under human body walking and the prone position state.When measuring human body walking, as shown in Figure 1, the direction of human body walking must be along X direction, when human body is come on the extension board, consider that extension board 2 stablizes area characteristics triangular in shape, require human body, simultaneously the distance of walking is carried out suitable control as far as possible along the centrage walking of extension board 2, as shown in Figure 2, terminal point will leave fulcrum C one segment distance L 1, its length is about 1/3 of extension board 2 length, in order to avoid platform topples.Simultaneously when walking, walking speed should remain a constant speed as far as possible, exerts an influence with the detection to position of human center of the inertia force of eliminating human body.When prone position was measured, cover plate 1 was connected with the attached plate 3 of its both sides, to increase the Area of bearing of the lateral rotation of lower limb under the human prone position state; Extension board 2 is connected with the attached plate of its both sides, can launch during use, the Area of bearing when increasing the lateral movement of human prone position state lower arms.When measuring prone position, human body should be sat down from cover plate 1, slowly lie down then and after move, head can be supported on extension board support column 5 places of extension board 2.
The calculating principle is as follows: as shown in Figures 2 and 3, suppose that cover plate length is AB, extension board length is BC, and its width all is DE, under the condition of known person body weight G, in AB-BC direction, i.e. X-direction, when position of human center moves to x, from the AB direction, the pressure F that A is ordered ABe cover plate A side two pressure transducer numerical value sums, belong to given value; The pressure F that B is ordered BFor cover plate B side two pressure sensor numerical value sums, also belong to given value; The numerical value F of point C CSize equals human body weight G and deducts F AAnd F B, also be given value; Lateral separation L when between each support column of test platform a, L bWhen known, according to the equilibrated relation of x yawning moment, C gets square to fulcrum, can get: ∑ M C=0:F A* (L a+ L b)+F B* L b-G * (L a+ L b-x)=0, x=L then a+ L b-F A* (L a+ L b)/G-F B* L b/ G can determine position of centre of gravity x value; Equally, in the DE direction, i.e. Y direction, when the gravity center of human body moves to y, from the DE direction, the pressure F that D is ordered DBe the numerical value sum of cover plate D side two sensors, belong to given value, the pressure F that E is ordered ENumerical value sum for cover plate E side two sensors also belongs to given value; Point C is positioned at the mid point of 2 of D, E, when human body weight is given value G, and the numerical value F that C is ordered CSize equals G and deducts F DAnd F E, also be given value, the fore-and-aft distance L when between the cover plate support column of test platform cWhen known,, the D point is got square: ∑ M according to the equilibrated relation of y yawning moment D=0:F C* 0.5 * L c+ F E* L c-G * y=0, then y=(0.5 * F C+ F E) * L c/ G, wherein F C=G-F D-F E, can determine position of centre of gravity y value.
As shown in Figure 4, the operation principle of this instrument is to utilize pressure transducer, the distributed load of the many fulcrums of force plate/platform is tested and is calculated, by data acquisition, A/D conversion, organized data is handled and the drawing print software, realizes the Real-time and Dynamic Detection of position of human center.

Claims (3)

1. gravity center of human body's dynamic position measuring instrument, it includes force plate/platform, pressure transducer, data collecting card and PC computer, it is characterized in that: described force plate/platform is by cover plate, extension board and attached plate are formed, one end of cover plate and extension board is hinged, be provided with an extension board support column below the extension board other end, be provided with four cover plate support columns below the cover plate two ends altogether, between cover plate support column and cover plate, be provided with pressure transducer, point contact between pressure transducer and the cover plate, both sides at cover plate and extension board are connected with attached plate respectively, and pressure transducer is connected with the PC computer with data collecting card by circuit.
2. gravity center of human body's dynamic position measuring instrument according to claim 1, the dynamic change measuring method of position of centre of gravity is as follows under the human body walking state:
A. hinged cover plate and extension board;
When b. walking along X direction, when human body is come on the extension board, consider that extension board stablizes area characteristics triangular in shape, require human body as far as possible along the centrage walking of extension board, simultaneously the distance of walking is carried out suitable control, terminal point will be apart from extension board support column one segment distance, its length is about 1/3 of extension board length, simultaneously when walking, walking speed should remain a constant speed as far as possible, exerts an influence with the detection to position of human center of the inertia force of eliminating human body;
C. it is as follows to calculate principle: suppose that cover plate length is AB, extension board length is BC, and its width all is DE, under the condition of known person body weight G, and in the AB-BC direction, i.e. X-direction, when position of human center moves to x, from the AB direction, the pressure F that A is ordered ABe cover plate A side two pressure transducer numerical value sums, belong to given value; The pressure F that B is ordered BFor cover plate B side two pressure sensor numerical value sums, also belong to given value; The numerical value F of point C CSize equals human body weight G and deducts F AAnd F B, also be given value; Lateral separation L when between each support column of test platform a, L bWhen known, according to the equilibrated relation of x yawning moment, C gets square to fulcrum, can get: ∑ M C=0:F A* (L a+ L b)+F B* L b-G * (L a+ L b-x)=0, x=L then a+ L b-F A* (L a+ L b)/G-F B* L b/ G can determine position of centre of gravity x value; Equally, in the DE direction, i.e. Y direction, when the gravity center of human body moves to y, from the DE direction, the pressure F that D is ordered DBe the numerical value sum of cover plate D side two sensors, belong to given value, the pressure F that E is ordered ENumerical value sum for cover plate E side two sensors also belongs to given value; Point C is positioned at the mid point of 2 of D, E, when human body weight is given value G, and the numerical value F that C is ordered CSize equals G and deducts F DAnd F E, also be given value, the fore-and-aft distance L when between the cover plate support column of test platform cWhen known,, the D point is got square: ∑ M according to the equilibrated relation of y yawning moment D=0:F C* 0.5 * L c+ F E* L c-G * y=0, then y=(0.5 * F C+ F E) * L c/ G, wherein F C=G-F D-F ECan determine position of centre of gravity y value;
D. utilize pressure transducer, distributed load is tested and is calculated to many support columns of force plate/platform, and by data acquisition, A/D conversion, organized data is handled and the drawing print software, realizes the real time dynamic measurement of position of human center.
3. gravity center of human body's dynamic position measuring instrument according to claim 1, the dynamic change measuring method of position of centre of gravity is as follows under the human prone position state:
A. hinged cover plate and extension board, and flexibly connect attached plate respectively in its both sides;
When b. prone position was measured, human body should be sat down from cover plate, slowly lie down then and after move, head can be supported on the extension board support column place of extension board, launches the attached plate that is connected with cover plate, can increase the Area of bearing of the lateral rotation of lower limb under the human prone position state; The attached plate that expansion is connected with extension board, the Area of bearing in the time of can increasing the lateral movement of human prone position state lower arms;
C. it is as follows to calculate principle: suppose that cover plate length is AB, extension board length is BC, and its width all is DE, under the condition of known person body weight G, and in the AB-BC direction, i.e. X-direction, when position of human center moves to x, from the AB direction, the pressure F that A is ordered ABe cover plate A side two pressure transducer numerical value sums, belong to given value; The pressure F that B is ordered BFor cover plate B side two pressure sensor numerical value sums, also belong to given value; The numerical value F of point C CSize equals human body weight G and deducts F AAnd F B, also be given value; Lateral separation L when between each support column of test platform a, L bWhen known, according to the equilibrated relation of x yawning moment, C gets square to fulcrum, can get: ∑ M C=0:F A* (L a+ L b)+F B* L b-G * (L a+ L b-x)=0, x=L then a+ L b-F A* (L a+ L b)/G-F B* L b/ G can determine position of centre of gravity x value; Equally, in the DE direction, i.e. Y direction, when the gravity center of human body moves to y, from the DE direction, the pressure F that D is ordered DBe the numerical value sum of cover plate D side two sensors, belong to given value, the pressure F that E is ordered ENumerical value sum for cover plate E side two sensors also belongs to given value; Point C is positioned at the mid point of 2 of D, E, when human body weight is given value G, and the numerical value F that C is ordered CSize equals G and deducts F DAnd F E, also be given value, the fore-and-aft distance L when between the cover plate support column of test platform cWhen known,, the D point is got square: ∑ M according to the equilibrated relation of y yawning moment D=0:F C* 0.5 * L c+ F E* L c-G * y=0, then y=(0.5 * F C+ F E) * L c/ G, wherein F C=G-F D-F ECan determine position of centre of gravity y value;
D. utilize pressure transducer, distributed load is tested and is calculated to many support columns of force plate/platform, and by data acquisition, A/D conversion, organized data is handled and the drawing print software, realizes the real time dynamic measurement of position of human center.
CNB2006100432477A 2006-03-22 2006-03-22 Human body centre-of gravity dynamic position measuring instrument and its measuring method Expired - Fee Related CN100388906C (en)

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