CN102078195A - Human body balance function tester - Google Patents

Abstract

The invention discloses a human body balance function tester, and belongs to the field of embedded computers. The tester comprises three parts, namely a sensor force platform, a data acquisition circuit, and a comprehensive evaluation process, wherein the sensor force platform is a regular triangle iron plate, and a resistance strain gage sensor is arranged at three vertexes respectively; the data acquisition circuit comprises three groups of amplifier circuits, each group of circuit is in a three-stage amplification mode, and amplification factors are respectively 22.3 times, 1 time and 9.4 times; the output of the amplifier circuits is directly delivered to an analog-to-digital conversion port of an MSP430 singlechip; a digital value obtained through analog-to-digital conversion is transmitted to the comprehensive evaluation process of a personal computer (PC), and data is further processed by the process; and a score of the balance function of a testee is calculated according to a quantitative evaluation algorithm and a print report is output. Meanwhile, the comprehensive evaluation process also can draw a static posture map and can be connected to a MySQL database to complete the functions of adding, deleting, modifying and searching testee information and test data. The human body balance function tester has important significance in the fields such as medical rehabilitation, athlete selection and the like.

Description

Human balance function tester

technical field

The invention belongs to the field of embedded computers and relates to a human body balance function tester.

Background technique

When a person is standing still, it is actually impossible to keep absolutely still. The center of gravity of the human body will always shake with varying degrees. This is beyond the control of self-consciousness. It is called physiological postural shaking. directly related to the balance function. Balance function is an important function of the human neuromotor system. Many nervous system diseases show different degrees of balance dysfunction. The measurement of balance ability is an important basis for evaluating the effect of physical therapy and rehabilitation of patients with nervous system diseases. Evaluation indicators for the selection of professionals (competitive athletes, astronauts, pilots, divers, etc.) and feedback on auxiliary training results. At the same time, the measurement of balance function plays an important role in the monitoring of changes in the physical condition of the elderly, disease prevention, identification of national physical fitness, and evaluation of national aging trends. The present invention designs and completes the computer system for testing and evaluating the balance function of the human body, which can measure the balance function data, draw the tester's static posture diagram (the real-time curve of the moving track of the center of gravity), and give quantitative evaluation to the balance function of the human body.

Contents of the invention

The technical problem to be solved by the present invention is to provide a human body balance function tester, which can complete real-time measurement, analysis, evaluation, storage, display and report output of the movement of the center of gravity of the human body.

Technical scheme of the present invention:

The human body balance function tester includes three parts: a sensor force measuring platform, a data acquisition circuit and a comprehensive evaluation program. The first two parts are the hardware part of the tester, and the comprehensive evaluation program is the software part of the tester, which runs on a PC.

The sensor force measuring platform is an equilateral triangular iron plate with a thickness of 10mm and a side length of 600mm. A 2g1 type resistance strain gauge sensor is installed at each of the three vertices below the iron plate to collect the movement signal of the center of gravity of the human body. The data acquisition circuit is a circuit board based on the MSP430 single-chip microcomputer. It is designed with three identical amplification circuits, all of which are three-stage amplification, and is responsible for amplifying the voltage signal transmitted by the sensor to the acceptable range of the single-chip microcomputer. The AD623 amplifier is used for the first stage amplification, and the magnification factor is 22.3 times; the OP07 amplifier is used for the second stage amplification, and the magnification factor is 1 times; the OP07 amplifier is still used for the third stage amplification, and the magnification factor is 9.4 times, and the total magnification factor of the three stages is 209.62 times. The data acquisition circuit is designed with a serial port and a USB interface, which are used to transmit the digitized voltage signal to the comprehensive evaluation program running on the PC.

The comprehensive evaluation program includes three modules: test management, system management and data management.

(1) The test management module consists of three sub-modules: tester management, test record management and quantitative evaluation algorithm. The tester management sub-module realizes the functions of adding, deleting, modifying and checking the tester’s information, and provides a test interface, which can conduct 6 tests on the tester, namely: eyes with both feet open, eyes closed with both feet, linear step Eyes open, linear step eyes closed, one foot with eyes open, and one foot with eyes closed. The test record management sub-module realizes the functions of adding, deleting, modifying and checking the test records; the quantitative evaluation algorithm is the main body of the comprehensive evaluation program, which converts the digital quantity of the voltage signal uploaded by the data acquisition circuit into the coordinates of the two-dimensional rectangular coordinate system value, and then calculate the tester's center of gravity swing trajectory length L, swing area A, swing dominance degree W, and swing angle Q, etc., let Eval be the product of the four indicators, and formula (1) is obtained:

Eval＝L×A×W×Q (1)

Then, the actual measurement is carried out on various types of people, and the tester's balance ability score is calculated according to the formula (2):

$\mathrm{<span\; class="notranslate">\; Mark</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; Mark</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Mark</span>}}_{\mathrm{<span\; class="notranslate">\; min</span>}}}{{\mathrm{<span\; class="notranslate">\; Eval</span>}}_{\mathrm{<span\; class="notranslate">\; min</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Eval</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Eval</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Eval</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Mark</span>}}_{\mathrm{<span\; class="notranslate">\; min</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

In the formula (2), Eval _max is the maximum value of the index product among each measurer, and Mark _min is the balance ability score of the tester, which is specified by the tester; Eval _min is the minimum value of the index product among each measurer, and Mark _max Score the tester's balance ability, as assigned by the tester. For any tester, the Eval value calculated through the actual measurement can be substituted into the formula (2) to obtain the balance ability score.

(2) The system management module is composed of three sub-modules: system setting, system connection and system calibration. The system setting sub-module is responsible for setting the various parts of the comprehensive evaluation program; the system connection sub-module provides the driver of the hardware interface and is responsible for connecting the PC with the data acquisition circuit. The optional connection methods include serial port connection and USB connection ; The system calibration sub-module is responsible for calibrating the sensor.

(3) The data management module is based on the MySQL database and consists of three sub-modules: data backup, data restoration and data display. The data backup sub-module is responsible for backing up all the data in the program to the database; the data restoration sub-module is responsible for restoring the data in the database to the program; the function of the data display sub-module is to draw the static posture map of the tester and calculate the quantitative evaluation algorithm. The test taker's balance ability score obtained is displayed and a printing service is provided.

The connection and operation mode of the human balance function tester are as follows:

Each sensor of the force measuring platform has 4 lead wires, including 1 power wire and 1 ground wire, 2 differential signal wires, and a total of 12 wires for the three sensors. Connect these 12 lines to the input end of the data acquisition circuit, and use a USB transmission line or a serial port transmission line to connect the data acquisition circuit to the corresponding communication interface of the PC. When the system is running, turn on the power of the data acquisition circuit, start the comprehensive evaluation program on the PC, select serial port connection or USB connection according to the actual communication mode of the hardware, establish user information for the tester, and then start the test.

The specific working process of the system is as follows: the sensors at the three vertices of the force measuring platform respectively detect the pressure, convert it into a tiny voltage signal and send it to the data acquisition circuit. After the signal is amplified, analog-to-digital converted and digitally filtered, it is sent to the PC The comprehensive evaluation program of the tester is stored in the database, and then the balance ability of the tester is given a quantitative evaluation according to the quantitative evaluation algorithm. During the measurement, the comprehensive evaluation program will also draw a static posture map of the test subject.

The beneficial effect of the invention is that it can measure the real-time data of the shaking of the tester's center of gravity, draw a static posture diagram according to the data, and give a quantitative evaluation of the tester's balance ability. The tester's personal information and test data can be saved in the PC database for inquiry at any time. The system is easy to use, easy to maintain, low in cost, and has good economy.

Description of drawings

Fig. 1 is a system structure diagram of the present invention.

Among them: 1 force measuring platform; 2 resistance strain gauge sensor; 3 three sets of sensor output signal lines; 4 data acquisition circuit; 5 amplifier circuit; 6 MSP430 single-chip microcomputer;

Fig. 2 is a schematic diagram of a single-channel three-stage amplifying circuit of the data acquisition circuit of the present invention.

Fig. 3 is a software structural diagram of the PC comprehensive evaluation program of the present invention.

Detailed ways

The specific embodiments of the present invention will be described in detail below in combination with the summary of the invention and the accompanying drawings.

(1) Sensor force measuring platform

The sensor force measuring platform of the human balance function tester is an equilateral triangular iron plate with a thickness of 10mm and a side length of 600mm. A bridge-shaped 2g1 resistance strain gauge sensor is placed at each of the three vertices below the iron plate. The two ends of the sensor are fixed with the upper iron plate with screws, and the middle part of the sensor is grounded downward through screws. Each sensor leads to 4 wires, which are a power wire, a ground wire, and two differential signal wires, and these four wires are connected to the data acquisition circuit. When the tester stands upright on the force measuring platform, the iron plate is subjected to downward pressure, causing the sensor to deform, which will generate a small voltage signal. When the tester's center of gravity moves, the output of the three sensors will also change accordingly. According to the three The difference between these values can be used to calculate the current position of the tester's center of gravity.

(2) Data acquisition circuit

The data acquisition circuit of the human body balance function tester takes the MSP430 single-chip microcomputer as the core, and realizes three functions of signal amplification, data processing and data transmission. The signal amplification part is responsible for collecting and amplifying the output signal of the sensor. It is composed of three identical three-stage amplifier circuits. Each amplifier circuit corresponds to one sensor output signal. The schematic diagram of the single amplifier circuit is shown in Figure 2. The first stage of the amplifying circuit adopts high-precision single-supply instrumentation amplifier AD623, and the design magnification is 22.3 times; the middle stage uses OP07 emitter follower as the buffer stage, and the magnification is 1 time; the final stage still uses OP07 as the multi-stage amplifying output stage , with a magnification of 9.4x. The output of the multi-stage amplifier circuit is directly sent to the multi-function IO port of MSP430 microcontroller: P6.4, P6.5, P6.6, these three interfaces have 12-bit analog-to-digital conversion function.

After the multi-function I/O port of the MSP430 single-chip microcomputer completes the analog-to-digital conversion of the signal, it needs to perform a digital filtering operation. Specifically, for every 10 data, remove the two maximum values, and then remove the two minimum values. For the remaining 6 data The data is averaged and used as the final digital quantity representing the pressure signal. Thereafter, the digital quantity is transmitted to the comprehensive evaluation program of the PC through the serial port or the USB interface for further processing.

(3) Comprehensive evaluation procedure

The comprehensive evaluation program of the human body balance function tester is responsible for receiving the data uploaded by the data acquisition circuit, and analyzing, calculating, displaying and storing the data according to the quantitative evaluation algorithm. The software architecture of the program is shown in Figure 3, including the test management module, system management There are three parts of module and data management module.

The test management module consists of three sub-modules: tester management, test record management and quantitative evaluation algorithm. The tester management sub-module can add new testers, delete testers that are no longer needed, modify various information of testers, and query all information of testers based on keywords such as name and test time. Another function of the tester management sub-module is to provide an operation interface for the program test, which can conduct 6 tests on the tester, respectively testing the testee's feet with eyes open, feet with eyes closed, linear step with eyes open, and linear step with closed eyes. The position data of the center of gravity when one eye is open, one foot is open, and one foot is closed. The test record management sub-module can add new test records, delete test records that are no longer needed, and query test records according to keywords such as tester's name and test time. The quantitative evaluation algorithm is responsible for converting the data uploaded by the data acquisition circuit into an evaluation value representing the balance ability of the tester, which is the core function of the comprehensive evaluation program.

The system management module consists of three sub-modules: system setting, system connection and system calibration. The system setting sub-module is responsible for setting the functions of each part of the comprehensive evaluation program, mainly setting the subjects' eyes open with both feet, eyes closed with both feet, eyes opened with linear steps, eyes closed with linear steps, eyes opened with one foot, and eyes closed with one foot Wait for the duration of the 6 tests; the system connection sub-module is responsible for selecting the hardware connection mode between the PC and the data acquisition circuit, the options are serial port connection and USB connection, and the module also provides corresponding drivers; For calibration, when calibrating, it is necessary to prepare a standard weight of 10kg and a standard weight of 80kg, and calibrate each sensor separately.

The data management module is composed of three sub-modules: data backup, data restoration and data display. The data backup sub-module can back up part or all of the tester information and test data to the database or excel sheet according to the user's choice; the data restoration sub-module can restore the specified information from the database or excel to the program according to the user's needs Middle; The data display sub-module can draw the tester's static posture map in real time according to the position information calculated by the quantitative evaluation algorithm, and display the tester's balance ability score, and output a printed report.

(4) Quantitative evaluation algorithm

The quantitative evaluation algorithm consists of three parts: the coordinate transformation part, the balance index calculation part and the evaluation result calculation part. The coordinate transformation part receives the three-way voltage signal uploaded by the data acquisition circuit, and converts the three-way voltage signal into a point on the two-dimensional rectangular coordinate system, that is, the coordinate value of the position information of the tester, and completes the transition from the center of gravity of the triangular iron plate to the rectangular coordinate system mapping. The calculation part of the balance index calculates the tester's center of gravity swing track length, swing area, swing angle, and swing dominance according to the tester's coordinate movement in the Cartesian coordinate system. The evaluation result calculation part calculates the final score of the tester's balance ability according to the aforementioned four indicators. These indicators are directly related to the balance ability of the tester. The larger the index value, the worse the balance ability, and vice versa. According to formula (1), let Eval be the product of the four indicators, conduct actual measurements on various types of people, and calculate the Eval value of each tester, set the maximum value as Eval _max , and the corresponding balance ability score as Mark _min ; let the minimum value be Eval _min , and its corresponding balance ability score be Mark _max . Taking Eval as the horizontal axis and the tester's score as the vertical axis, a straight line can be determined from two points (Eval _max , Mark _min ) and (Eval _min , Mark _max ), and the equation of the straight line is formula (2). For any tester, the Eval value is calculated through actual measurement, and then the balance ability score can be obtained according to formula (2).

Claims (1)

1. a human body balance function tester is made up of three parts, is respectively: sensor force measuring platform, data acquisition circuit, comprehensive evaluation program, is characterized in that: The sensor force measuring platform adopts an equilateral triangle iron plate with a side length of 600mm and a thickness of 10mm. A 2g1 type resistance strain gauge sensor is installed at each of the three vertices. The data acquisition circuit is designed with three identical amplifying circuits, and each amplifying circuit is a three-stage amplifying circuit. The input stage adopts AD623 instrument amplifier, and the magnification factor is 22.3 times; the middle stage uses OP07 to form an emitter follower; the final stage uses OP07 to form Output stage, the magnification is 9.4 times. The controller of the data acquisition module adopts MSP430 single-chip microcomputer, and the P6.4, P6.5, P6.6 three multi-function IO ports of the single-chip microcomputer select the analog-to-digital conversion function, and perform analog-to-digital conversion on the output of each amplifier circuit respectively, and the conversion is obtained The digital quantity can be sent to the PC comprehensive evaluation program through the serial port or USB interface. The PC comprehensive evaluation program adopts MySQL database, which has several functions such as data transmission, analysis, evaluation, storage, display and print report output. The comprehensive evaluation program is divided into three modules: test management, system management and data management. The test management module is divided into three sub-modules: tester management, test record management, and quantitative evaluation algorithm; the system management module is divided into three sub-modules: system setting, system connection and system calibration; the data management module is divided into data backup, data restoration and data Three submodules are shown. The core part of the comprehensive evaluation program is the quantitative evaluation algorithm, which converts the digital value of the voltage signal uploaded by the data acquisition circuit into the coordinate value of the two-dimensional rectangular coordinate system, and then calculates the swing trajectory length L, swing area A, and Four indicators such as the degree of swing advantage W and the swing angle Q, let Eval be the product of the four indicators, and the formula (1) is obtained: Eval＝L×A×W×Q (1) Then, the actual measurement is carried out on various types of people, and the tester's balance ability score is calculated according to the formula (2): $\mathrm{<span\; class="notranslate">\; Mark</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; Mark</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Mark</span>}}_{\mathrm{<span\; class="notranslate">\; min</span>}}}{\mathrm{<span\; class="notranslate">\; Eva</span>}{\mathrm{<span\; class="notranslate">\; l</span>}}_{\mathrm{<span\; class="notranslate">\; min</span>}}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Eval</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}}<span\; class="notranslate">\; \&times;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Eval</span>}<span\; class="notranslate">\; -</span>{\mathrm{<span\; class="notranslate">\; Eval</span>}}_{\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Mark</span>}}_{\mathrm{<span\; class="notranslate">\; min</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$ In formula (2), Evalmax is the maximum value of the index product among each measurer, and Markmin is the balance ability score of the tester, which is specified by the tester; Evalmin is the minimum value of the index product among each measurer, and Markmax is the tester's balance ability score. The balance score for the tester is assigned by the tester. For any tester, the Eval value calculated through the actual measurement can be substituted into the formula (2) to obtain the balance ability score.

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