CN1830390A - Measuring instrument and measuring method for dynamic position of center of gravity of human body - Google Patents

Abstract

A measurer for measuring the dynamic position of the gravitational center of human body is composed of a force measuring platform with several supporting columns, pressure sensors, data acquisition card, and PC. Its measuring method is also disclosed.

Description

Measuring instrument and measuring method for dynamic position of center of gravity of human body

technical field

The invention relates to a force measuring instrument, in particular to a measuring instrument for the dynamic position of the center of gravity of a human body and a measuring method thereof.

Background technique

We know that it is a general method to test the change of the center of gravity position (balance function) of the human body with a mechanical platform at present. The force measuring platform has three fulcrums, small platforms with four fulcrums, and large-area platforms with six fulcrums. The design ideas of these instruments are mainly for the measurement of the position of the center of gravity (center of pressure) of the human body under the condition of the human body standing (standing or walking), without considering the detection under the condition of the human body lying down. Also very inconvenient.

Contents of the invention

In order to overcome the disadvantages of the above-mentioned prior art, the present invention provides a simple in structure, convenient in operation, easy to carry, multifunctional measuring instrument for measuring the dynamic position of the center of gravity of human body and its measuring method.

The object of the present invention is achieved by adopting the following technical solutions: a measuring instrument for the dynamic position of the center of gravity of a human body, which includes a force-measuring platform, a pressure sensor, a data acquisition card and a PC computer, and the described force-measuring platform consists of a cover plate, an extended One end of the cover plate and the extension plate is hinged, an extension plate support column is provided under the other end of the extension plate, and four cover plate support columns are respectively provided under the two ends of the cover plate. A pressure sensor is arranged between the boards, and the point contact between the pressure sensor and the cover plate is movably connected to the two sides of the cover plate and the extension plate respectively, and the pressure sensor is connected with the data acquisition card and the PC computer through a line.

The measurement method for the dynamic change of the center of gravity position in the walking state of the human body is as follows:

a. Hinge the cover plate and the extension plate;

b. When walking along the horizontal axis, when the human body walks into the extension board, considering that the stable area of the extension board is triangular, the human body is required to walk along the center line of the extension board as much as possible, and at the same time, the walking distance is properly adjusted. Control, the end point should be a distance away from the support column of the extension plate, and its length is about 1/3 of the length of the extension plate. At the same time, when walking, the walking speed should be kept as uniform as possible to eliminate the influence of the inertial force of the human body on the detection of the center of gravity of the human body. ;

c. The calculation principle is as follows: Assume that the length of the cover plate is AB, the length of the extension plate is BC, and its width is DE. Under the condition of known body weight G, when the center of gravity of the human body moves to x in the x direction, the The pressure F _A is the sum of the values of the two pressure sensors at the left end of the cover, which is a known value; the pressure F _B at point B is the sum of the values of the two pressure sensors at the right end of the cover, which is also a known value; the value of point C is F _c It is equal to the weight of the human body G minus F _A and F _B , which is also a known value; when the lateral distance L _a and L _b between the support columns of the test platform are known, according to the relationship of moment balance in the x direction, the fulcrum C is taken as moment, we can get: ∑M _C ＝0: F _A ×(L _a +L _b )+F _B ×L _b -G×(L _a +L _b -x)＝0, then x＝L _a +L _b -F _A ×(L _a +L _b )/GF _B ×L _b /G, can determine the x value of the center of gravity position; similarly, in the y direction, when the center of gravity of the human body moves to y, the pressure F _D at point D is the left side of the cover plate The sum of the values of the two sensors on the side is a known value, and the pressure F at point _E is the sum of the values of the two sensors on the right side of the cover plate, which is also a known value; point C is located at the midpoint of D and E, when When the body weight is a known value G, the value F _C of point C is equal to G minus F _D and F _E , which is also a known value. When the longitudinal distance L _C between the support columns of the cover plate of the test platform is known , according to the relationship of moment balance in the y direction, take moment for point A: ∑M _A =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, where F _C =GF _D -F _E can determine the y value of the center of gravity position;

d. Use the pressure sensor to test and calculate the distributed load of the multi-support columns of the force measuring platform. Through data collection and A/D conversion, data processing and drawing printing software are compiled to realize real-time dynamic measurement of the center of gravity of the human body.

The method for measuring the dynamic change of the position of the center of gravity of the human body in a prone position is as follows:

a. Hinge the cover plate and the extension plate, and connect the attached plates on both sides respectively;

b. When measuring in a prone position, the human body should sit down from the cover, then slowly lie down and move back, the head can be supported on the extension plate support column of the extension plate, and the attached plate connected to the cover can be expanded to increase the body weight. The support area for the lateral rotation of the leg in the prone position; the expansion of the attached plate connected to the extension plate can increase the support area of the arm when the human body moves laterally in the prone position;

c. The calculation principle is as follows: Assume that the length of the cover plate is AB, the length of the extension plate is BC, and its width is DE. Under the condition of known body weight G, when the center of gravity of the human body moves to x in the x direction, the The pressure F _A is the sum of the values of the two pressure sensors at the left end of the cover, which is a known value; the pressure F _B at point B is the sum of the values of the two pressure sensors at the right end of the cover, which is also a known value; the value of point C is F _C It is equal to the weight of the human body G minus F _A and F _B , which is also a known value; when the lateral distance L _a and L _b between the support columns of the test platform are known, according to the relationship of moment balance in the x direction, the fulcrum C is taken as moment, we can get: ∑M _C ＝0: F _A ×(L _a +L _b )+F _B ×L _b -G×(L _a +L _b -x)＝0, then x＝L _a +L _b -F _A ×(L _a +L _b )/GF _B ×L _b /G, can determine the x value of the center of gravity position; similarly, in the y direction, when the center of gravity of the human body moves to y, the pressure F _D at point D is the left side of the cover plate The sum of the values of the two sensors on the side is a known value, and the pressure F at point _E is the sum of the values of the two sensors on the right side of the cover plate, which is also a known value; point C is located at the midpoint of D and E, when When the body weight is a known value G, the value F _C of point C is equal to G minus F _D and F _E , which is also a known value. When the longitudinal distance L _c between the support columns of the cover plate of the test platform is known , according to the relationship of moment balance in the y direction, take moment for point A: ∑M _A =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, where F _C =GF _D -F _E , the y value of the center of gravity position can be determined;

d. Use the pressure sensor to test and calculate the distributed load of the multi-support columns of the force measuring platform. Through data collection and A/D conversion, data processing and drawing printing software are compiled to realize real-time dynamic measurement of the center of gravity of the human body.

In the present invention, the cover plate and the extension plate are hinged, and the attached plates are respectively connected on both sides of the cover plate. Cover plate support columns with pressure sensors are respectively provided under the two ends of the cover plate. The connection between the sensor and the cover plate should be point contact, so as to Avoid statically indeterminate mechanical structures caused by moments at the joints. The cover plate can be used alone to test the shaking of the center of gravity (balance ability) of the human body when the human body is standing under the standing posture. An extension plate support column is arranged under the other end of the extension plate, and the pressure sensor is connected with the data acquisition card and the PC computer through a line. When in use, the position of the center of gravity can be calculated according to the principle of moment balance when the human body walks on it or lies down. Using the pressure sensor to test and calculate the distributed load of the multi-support columns of the force measuring platform, through data collection, A/D conversion, data processing and drawing printing software, the real-time dynamic measurement of the center of gravity of the human body is realized. The advantages of the present invention are:

(1) Multiple functions, it can not only test the dynamic change of the center of gravity when the human body is standing or walking in the standing position, but also can test the change law of the position of the center of gravity of the human body (caused by changes in the limbs) in the lying position;

(2) It is easy to carry, and can be freely disassembled between the attached board, the cover board and the extension board;

(3) The method of using 5 fulcrums and 4 sensors not only expands the effective area of the test, but also solves the problem of structural static instability in mechanics in theory and practice, and at the same time reduces the number of sensors, making the structure of the electromechanical system more flexible. Simple and reliable. The invention can be used as material selection for physical training and sports, and can also serve for the physical fitness testing of the whole people, medical rehabilitation and the like.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of force in the horizontal axis direction of the force measuring platform of the present invention;

Fig. 3 is a schematic diagram of force in the direction of the longitudinal axis of the force measuring platform of the present invention;

Fig. 4 is a schematic block diagram of the circuit of the present invention.

In the figure 1. cover plate, 2. extension plate, 3. attached plate, 4. cover plate support column, 5. extension plate support column.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Embodiment: The structure is shown in Figure 1. The force measuring platform is composed of a cover plate 1, an extension plate 2 and an attached plate 3. One end of the cover plate 1 and the extension plate 2 is hinged, and an extension plate is provided under the other end of the extension plate 2. Column 5, four cover support columns 4 are arranged under the two ends of the cover plate 1 respectively, and a pressure sensor is arranged between the cover plate support column 4 and the cover plate 1, and the point contact between the pressure sensor and the cover plate 1 is Both sides of the board 1 and the extension board 2 are respectively movably connected with an attached board 3, and the pressure sensor is connected with a data acquisition card and a PC computer through a line.

When the cover plate 1 is connected with the extension plate 2, the present invention can measure the dynamic change of the position of the center of gravity of the human body in walking and lying positions. When measuring human body walking, as shown in Figure 1, the direction of human body walking must be along the horizontal axis. Walk along the center line of the extension plate 2, and at the same time properly control the walking distance, as shown in Figure 2, the end point should be separated from the fulcrum C by a distance L ₁ , and its length is about 1/3 of the length of the extension plate 2, so as to avoid the platform from overturning . At the same time, when walking, the walking speed should be kept as uniform as possible to eliminate the influence of the inertial force of the human body on the detection of the position of the center of gravity of the human body. When measuring in the prone position, the cover plate 1 is connected with the attached plates 3 on both sides to increase the support area for the lateral rotation of the legs in the prone position of the human body; the extension plate 2 is connected with the attached plates on both sides, and can be unfolded during use , increase the support area when the arm moves laterally in the prone position. When measuring the lying position, the human body should sit down from the cover plate 1, then slowly lie down and move back, and the head can be supported on the extension plate support column 5 of the extension plate 2.

The calculation principle is as follows: As shown in Figure 2 and Figure 3, assuming that the length of the cover plate is AB, the length of the extension plate is BC, and its width is DE, under the condition of known body weight G, in the x direction, the position of the center of gravity of the human body moves When reaching x, the pressure F A at point _A is the sum of the values of the two pressure sensors at the left end of the cover, which is a known value; the pressure F B at point _B is the sum of the values of the two pressure sensors at the right end of the cover, which is also a known value; The value F _C of point C is equal to the weight of the human body G minus F _A and F _B , which is also a known value; when the lateral distance L _a and L _b between the support columns of the test platform are known, according to the moment balance in the x direction Take the moment of the fulcrum C, we can get: ∑M _C = 0: F _A × (L _a + L _b ) + F _B × L _b -G × (L _a + L _b -x) = 0, then x＝L _a +L _{b -FA} ×(L _a +L _b )/GF _B ×L _b /G, the x value of the center of gravity position can be determined; similarly, in the y direction, when the center of gravity of the human body moves to y, the point D The pressure F _D is the sum of the values of the two sensors on the left side of the cover, which is a known value, and the pressure F _E at point E is the sum of the values of the two sensors on the right side of the cover, which is also a known value; point C is located at D, E At the midpoint of the two points, when the weight of the human body is a known value G, the value F _C of point C is equal to G minus F _D and F _E , which is also a known value. When the distance L _c is known, according to the relationship of moment balance in the y direction, take the moment for point A: ∑M _A =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, where F _C =GF _D -F _E , the y value of the center of gravity position can be determined.

As shown in Figure 4, the working principle of the instrument is to use the pressure sensor to test and calculate the distributed load of the multi-support points of the force measuring platform, and through data collection, A/D conversion, data processing and drawing printing software, to realize the center of gravity of the human body Real-time dynamic detection of location.

Claims (3)

1. a human body center of gravity dynamic position measuring instrument, it comprises force measuring platform, pressure sensor, data acquisition card and PC computer, it is characterized in that: described force measuring platform is made up of cover plate, extension plate and attached plate, cover One end of the plate and the extension plate is hinged, an extension plate support column is provided under the other end of the extension plate, four cover plate support columns are respectively provided under the two ends of the cover plate, and a pressure sensor is arranged between the cover plate support column and the cover plate , the point contact between the pressure sensor and the cover plate, the two sides of the cover plate and the extension plate are respectively movably connected with the attached board, and the pressure sensor is connected with the data acquisition card and the PC computer through the line. 2. according to claim 1 described human body center of gravity dynamic position measuring instrument, the dynamic change measuring method of center of gravity position under the human body walking state is as follows: a. Hinge the cover plate and the extension plate; b. When walking along the horizontal axis, when the human body walks into the extension board, considering that the stable area of the extension board is triangular, the human body is required to walk along the center line of the extension board as much as possible, and at the same time, the walking distance is properly adjusted. Control, the end point should be a distance away from the support column of the extension plate, and its length is about 1/3 of the length of the extension plate. At the same time, when walking, the walking speed should be kept as uniform as possible to eliminate the influence of the inertial force of the human body on the detection of the center of gravity of the human body. ; c. The calculation principle is as follows: Assume that the length of the cover plate is AB, the length of the extension plate is BC, and its width is DE. Under the condition of known body weight G, when the center of gravity of the human body moves to x in the x direction, the The pressure F _A is the sum of the values of the two pressure sensors at the left end of the cover, which is a known value; the pressure F _B at point B is the sum of the values of the two pressure sensors at the right end of the cover, which is also a known value; the value of point C is F _C It is equal to the weight of the human body G minus F _A and F _B , which is also a known value; when the lateral distance L _a and L _b between the support columns of the test platform are known, according to the relationship of moment balance in the x direction, the fulcrum C is taken as moment, we can get: ∑M _C ＝0: F _A ×(L _a +L _b )+F _B ×L _b -G×(L _a +L _b -x)＝0, then x＝L _a +L _b -F _A ×(L _a +L _b )/GF _B ×L _b /G, can determine the x value of the center of gravity position; similarly, in the y direction, when the center of gravity of the human body moves to y, the pressure F _D at point D is the left side of the cover plate The sum of the values of the two sensors on the side is a known value, and the pressure F at point _E is the sum of the values of the two sensors on the right side of the cover plate, which is also a known value; point C is located at the midpoint of D and E, when When the body weight is a known value G, the value F _C of point C is equal to G minus F _D and F _E , which is also a known value. When the longitudinal distance L _c between the support columns of the cover plate of the test platform is known , according to the relationship of moment balance in the y direction, take moment for point A: ∑M _A =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, where F _C =GF _D -F _E can determine the y value of the center of gravity position; d. Use the pressure sensor to test and calculate the distributed load of the multi-support columns of the force measuring platform. Through data collection and A/D conversion, data processing and drawing printing software are compiled to realize real-time dynamic measurement of the center of gravity of the human body. 3. the human body center of gravity dynamic position measuring instrument according to claim 1, the dynamic change measuring method of the center of gravity position under the human body lying posture state is as follows: a. Hinge the cover plate and the extension plate, and connect the attached plates on both sides respectively; b. When measuring in a prone position, the human body should sit down from the cover, then slowly lie down and move back, the head can be supported on the extension plate support column of the extension plate, and the attached plate connected to the cover can be expanded to increase the body weight. The support area for the lateral rotation of the leg in the prone position; the expansion of the attached plate connected to the extension plate can increase the support area of the arm when the human body moves laterally in the prone position; c. The calculation principle is as follows: Assume that the length of the cover plate is AB, the length of the extension plate is BC, and its width is DE. Under the condition of known body weight G, when the center of gravity of the human body moves to x in the x direction, the The pressure F _A is the sum of the values of the two pressure sensors at the left end of the cover, which is a known value; the pressure F _B at point B is the sum of the values of the two pressure sensors at the right end of the cover, which is also a known value; the value of point C is F _C It is equal to the weight of the human body G minus F _A and F _B , which is also a known value; when the lateral distance L _a and L _b between the support columns of the test platform are known, according to the relationship of moment balance in the x direction, the fulcrum C is taken as moment, we can get: ∑M _C ＝0: F _A ×(L _a +L _b )+F _B ×L _b -G×(L _a +L _b -x)＝0, then x＝L _a +L _b -F _A ×(L _a +L _b )/GF _B ×L _b /G, can determine the x value of the center of gravity position; similarly, in the y direction, when the center of gravity of the human body moves to y, the pressure F _D at point D is the left side of the cover plate The sum of the values of the two sensors on the side is a known value, and the pressure F at point _E is the sum of the values of the two sensors on the right side of the cover plate, which is also a known value; point C is located at the midpoint of D and E, when When the body weight is a known value G, the value F _C of point C is equal to G minus F _D and F _E , which is also a known value. When the longitudinal distance L _c between the support columns of the cover plate of the test platform is known , according to the relationship of moment balance in the y direction, take moment for point A: ∑M _A =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, where F _C =GF _D -F _E can determine the y value of the center of gravity position; d. Use the pressure sensor to test and calculate the distributed load of the multi-support columns of the force measuring platform. Through data collection and A/D conversion, data processing and drawing printing software are compiled to realize real-time dynamic measurement of the center of gravity of the human body.

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