CN112206464A - A dumbbell fitness parameter detection method based on dynamic characteristic identification - Google Patents
A dumbbell fitness parameter detection method based on dynamic characteristic identification Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 abstract description 2
- 238000002474 experimental method Methods 0.000 description 16
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Classifications
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B21/00—Exercising apparatus for developing or strengthening the muscles or joints of the body by working against a counterforce, with or without measuring devices
- A63B21/06—User-manipulated weights
- A63B21/072—Dumb-bells, bar-bells or the like, e.g. weight discs having an integral peripheral handle
- A63B21/0726—Dumb bells, i.e. with a central bar to be held by a single hand, and with weights at the ends
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B71/00—Games or sports accessories not covered in groups A63B1/00 - A63B69/00
- A63B71/06—Indicating or scoring devices for games or players, or for other sports activities
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/225—Measuring circuits therefor
- G01L1/2262—Measuring circuits therefor involving simple electrical bridges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/12—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by alteration of electrical resistance
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B2220/00—Measuring of physical parameters relating to sporting activity
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- Physical Education & Sports Medicine (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biophysics (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
本发明涉及一种基于动力学特性辨识的哑铃健身参数检测方法，属于自动化领域。该方法为：将应变片附属于质量块上下两端，并连接入电桥，构成双臂半桥测量电路；举升哑铃过程中，应变片发生形变，电桥失去平衡而输出电压信号；输出电压信号先经过LM358运放放大，再由ADS1115将电压模拟量转换为数字量信号，然后将其输入下位机，即STM32单片机；下位机主动传输数据指令或在接收上位机通过蓝牙模块发送传输数据指令，将存储的数据由蓝牙模块传输至上位机，并显示。使人们在锻炼过程中能够看到自己运动时力量的大小和举升高度，实现监视化管理，以保证能够根据实际需求改变自己的运动强度，达到最好的锻炼效果。
The invention relates to a method for detecting fitness parameters of dumbbells based on dynamic characteristic identification, and belongs to the field of automation. The method is as follows: attach the strain gauge to the upper and lower ends of the mass block and connect it to an electric bridge to form a double-arm half-bridge measurement circuit; during the lifting of the dumbbell, the strain gauge is deformed, the bridge is out of balance and a voltage signal is output; The voltage signal is first amplified by the LM358 op amp, and then the analog voltage is converted into a digital signal by ADS1115, and then it is input to the lower computer, that is, the STM32 single-chip microcomputer; command to transmit the stored data from the Bluetooth module to the host computer and display it. It enables people to see their strength and lifting height during exercise, and realize monitoring management to ensure that they can change their exercise intensity according to actual needs and achieve the best exercise effect.
Description
Technical Field
The invention belongs to the field of automation, and relates to a dumbbell body-building parameter detection method based on kinetic characteristic identification.
Background
In today's society, people have a need not only to be full, but to pursue a healthier lifestyle. Sports is undoubtedly one of them. The dumbbell is a common exercise in our life, and not only can exercise the strength of our arms, but also can improve the stability of the body. However, during the exercise, people are not clear of the strength and lifting height of their own body and cannot monitor the strength of their own movement.
Disclosure of Invention
In view of the above, the present invention provides a dumbbell exercise parameter detection method based on dynamic characteristic identification.
In order to achieve the purpose, the invention provides the following technical scheme:
a dumbbell body-building parameter detection method based on dynamic characteristic identification comprises the following steps:
attaching the strain gauges to the upper end and the lower end of the mass block and connecting the strain gauges to an electric bridge to form a double-arm half-bridge measuring circuit;
in the dummy lifting process, the strain gauge deforms, the bridge loses balance and outputs a voltage signal;
the output voltage signal is amplified by LM358 operational amplifier, then the ADS1115 converts the voltage analog quantity into digital quantity signal, and then the digital quantity signal is input into a lower computer, namely STM32 singlechip;
the lower computer actively transmits data instructions or transmits data instructions through the Bluetooth module when receiving the data instructions transmitted by the upper computer, and the stored data are transmitted to the upper computer through the Bluetooth module and displayed.
Optionally, in the dummy lifting process, the resistance value of the transformer changes by Δ R due to the strain caused by the inertial force, the bridge loses balance to output voltage, and the corresponding acceleration is obtained by measuring the voltage; and obtaining the fitness parameters in the exercise process according to the kinematics and the dynamics.
Optionally, the fitness parameters include amplitude of lift and work done.
Optionally, in the lifting dummy process, the mass block generates an inertia force F under the action of the acceleration aaMa; wherein m-mass of the mass block;
the beam is strained under the action of inertial force:
wherein, the E-mass block is connected with the elastic modulus of the beam, and the L, b and h-mass blocks are connected with the length, width and thickness of the beam;
rate of change of resistance of strain gauge:
wherein the K-mass block is connected with the strain sensitivity coefficient of the beam;
output voltage of the double-arm plate bridge:
wherein the U-bridge supplies a power supply voltage;
voltage amplified by the operational amplifier:
wherein, D-operational amplification factor;
obtaining a relation between the acceleration and the voltage value:
from the beginning to t0Moment, dumbbell lifting amplitude:
from the beginning to t0Moment, the total lifting distance of the dumbbell, namely the accumulated lifting amplitude:
from the beginning to t0Moment, total work done by exercise:
wherein M represents the total mass of the dumbbell.
The invention has the beneficial effects that: people can see the strength and the lifting height of the user during exercise to realize monitoring management, so that the user can change the exercise strength according to actual requirements to achieve the best exercise effect.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a view showing the overall functional structure of the apparatus;
FIG. 2 is a layout view of strain gauges for a horizontal dumbbell tensile force;
FIG. 3 is a layout diagram of a vertical lifting dumbbell strain gauge.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 1 to 3, the strain gauges are attached to the upper and lower ends of the mass block and connected in parallel to the bridge to form a two-arm half-bridge measuring circuit. During the dummy lifting process, the strain gauge deforms, the bridge loses balance and outputs voltage. The voltage signal is amplified by LM358 operational amplifier, and then the ADS1115 converts the voltage analog quantity into digital quantity signal, and then the digital quantity signal is input into a lower computer-STM 32 singlechip. The lower computer can transmit data commands actively or in a receiving mode, wherein the data commands are transmitted by the upper computer through the Bluetooth module, and stored data are transmitted to the upper computer through the Bluetooth module and displayed.
And (3) analysis: the strain caused by the inertia force in the process of lifting the dumbbell enables the resistance value of the transformer to change delta R, the bridge loses balance and outputs voltage, and the corresponding acceleration can be obtained by measuring the voltage. And further obtaining the fitness parameters (such as lifting amplitude and work done) in the exercise process according to the kinematics and dynamics.
The mass block generates inertia force F under the action of acceleration aaMa. Wherein m represents the mass of the mass.
The beam is strained under the action of inertial force:
wherein, the E-mass block is connected with the elastic modulus of the beam, and the L, b and h-mass blocks are connected with the length, width and thickness of the beam.
Rate of change of resistance of strain gauge:
wherein the K-mass block is connected with the strain sensitivity coefficient of the beam.
Output voltage of the double-arm plate bridge:
wherein the U-bridge supplies the supply voltage.
Voltage amplified by the operational amplifier:
wherein, the D-operational amplification factor is used.
In conclusion, the relation between the acceleration and the voltage value is obtained:
from the beginning to t0Moment, dumbbell lifting amplitude:
from the beginning to t0Moment, total dumbbell lifting distance (cumulative lifting amplitude):
from the beginning to t0Moment, total work done by exercise:
wherein M represents the total mass of the dumbbell.
The experimental device has the following characteristics.
One, multiple modular experiments (comprehensive experiments). Unlike existing pressure measurement experimental devices, the experimental device is not limited to measuring only pressure. The experimental device is divided into the following three submodules: the device comprises a measuring circuit, a data transmission circuit and a back-end analysis processing algorithm. The three modules are all designed by students independently, and can help the students to complete the experiment of the sensor circuit, the experiment of data transmission and processing analysis and the experiment of back-end model design or system identification.
And secondly, freely changing parameters of experimental results. The experimental method is not limited to the standard experimental method (e.g., making the dumbbell freely fall or regularly lifting the dumbbell with a fixed device), but more, the experimental method enables the experimenter to independently and randomly lift the dumbbell, so that the measurement results of each time are different, and the students are required to repeatedly compare with the existing template for calibration analysis, which is different from the existing verification experiment with standard answers.
And thirdly, difficulty grading experiment. The experiment supports the independent experimental design of three submodules, and the three submodules can be designed together, so that the experiment can be carried out by students in different learning stages or levels.
And fourthly, moving the portable experiment. Each module of the experimental device is relatively independent, can be disassembled, can be carried about, has a simple structure and low cost, and is different from the existing pressure sensor test experiment based on a standard experimental platform.
The strain gauge can be flexibly fixed at different positions of the dumbbell according to requirements. Examples are as follows:
when the dumbbell is lifted vertically, it may be (but is not limited to) fixed at the left or right end of the dumbbell.
When the dumbbell is stretched horizontally, it may be (but is not limited to) fixed to a dumbbell bar.
Reference experiment procedure:
1. design and connection of a two-arm half-bridge measurement circuit.
2. And designing and connecting the operational amplifier and the ADC circuit module.
3. And selecting and connecting the type of the lower computer controller.
4. The matching, communication, debugging and the like of the wireless communication module and the upper computer.
5. Experiments were performed to obtain data.
6. And processing the data to obtain the fitness parameters.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (4)
1. A dumbbell body-building parameter detection method based on dynamic characteristic identification is characterized in that: the method comprises the following steps:
attaching the strain gauges to the upper end and the lower end of the mass block and connecting the strain gauges to an electric bridge to form a double-arm half-bridge measuring circuit;
in the dummy lifting process, the strain gauge deforms, the bridge loses balance and outputs a voltage signal;
the output voltage signal is amplified by LM358 operational amplifier, then the ADS1115 converts the voltage analog quantity into digital quantity signal, and then the digital quantity signal is input into a lower computer, namely STM32 singlechip;
the lower computer actively transmits data instructions or transmits data instructions through the Bluetooth module when receiving the data instructions transmitted by the upper computer, and the stored data are transmitted to the upper computer through the Bluetooth module and displayed.
2. The dumbbell body-building parameter detection method based on dynamic characteristic identification according to claim 1, characterized in that: in the dummy lifting process, the resistance value of the transformer is changed by delta R due to the strain caused by the inertia force, the bridge is out of balance to output voltage, and the corresponding acceleration is obtained by measuring the voltage; and obtaining the fitness parameters in the exercise process according to the kinematics and the dynamics.
3. The dumbbell body-building parameter detection method based on dynamic characteristic identification according to claim 2, characterized in that: the fitness parameters include amplitude of lift and work done.
4. The dumbbell body-building parameter detection method based on dynamic characteristic identification according to claim 2, characterized in that: in the dumb lifting process, the mass block generates inertia force F under the action of acceleration aaMa; wherein m-mass of the mass block;
the beam is strained under the action of inertial force:
wherein, the E-mass block is connected with the elastic modulus of the beam, and the L, b and h-mass blocks are connected with the length, width and thickness of the beam;
rate of change of resistance of strain gauge:
wherein the K-mass block is connected with the strain sensitivity coefficient of the beam;
output voltage of the double-arm plate bridge:
wherein the U-bridge supplies a power supply voltage;
voltage amplified by the operational amplifier:
wherein, D-operational amplification factor;
obtaining a relation between the acceleration and the voltage value:
from the beginning to t0Moment, dumbbell lifting amplitude:
from the beginning to t0At the moment of time, the time of day,the total lifting distance of the dumbbell, namely the accumulated lifting amplitude:
from the beginning to t0Moment, total work done by exercise:
wherein M represents the total mass of the dumbbell.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5971339A (en) * | 1997-09-30 | 1999-10-26 | Falasco, Jr.; Leo A | Hanging apparatus for a dumbbell |
| CN205850088U (en) * | 2016-07-05 | 2017-01-04 | 中国计量大学 | A kind of multifunctional dumbbell |
| DE102015014726A1 (en) * | 2015-10-05 | 2017-04-06 | Tobias Herberhold | Arrangement for supporting a predefinable storage |
| WO2020027608A1 (en) * | 2018-08-02 | 2020-02-06 | 계명대학교 산학협력단 | Smart dumbbell system capable of providing exercise feedback and control method therefor |
-
2020
- 2020-09-23 CN CN202011012521.0A patent/CN112206464A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5971339A (en) * | 1997-09-30 | 1999-10-26 | Falasco, Jr.; Leo A | Hanging apparatus for a dumbbell |
| DE102015014726A1 (en) * | 2015-10-05 | 2017-04-06 | Tobias Herberhold | Arrangement for supporting a predefinable storage |
| CN205850088U (en) * | 2016-07-05 | 2017-01-04 | 中国计量大学 | A kind of multifunctional dumbbell |
| WO2020027608A1 (en) * | 2018-08-02 | 2020-02-06 | 계명대학교 산학협력단 | Smart dumbbell system capable of providing exercise feedback and control method therefor |
Non-Patent Citations (2)
| Title |
|---|
| ___老九: "一、单臂桥、双臂桥、全桥性能比较实验", 《百度文库》 * |
| 滨海中学袁高超: "等强度梁实验指导书", 《百度文库》 * |
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