WO2009035364A1

WO2009035364A1 - Training device - dynamometer for measuring impact dynamic parameters

Info

Publication number: WO2009035364A1
Application number: PCT/RU2007/000585
Authority: WO
Inventors: Vladimir Nikolaevich Savelev
Original assignee: Vladimir Nikolaevich Savelev
Priority date: 2007-09-13
Filing date: 2007-10-24
Publication date: 2009-03-19
Also published as: RU2359728C2; RU2007134234A

Abstract

The invention relates to training devices for strength combats and also can be used as an entertaining attraction. Said invention makes it possible to obtain absolute and highly accurate values of sportsmen impact force while using standard punch bags and does not require calibration. The inventive training device-dynamometer comprises a punch bag (1), an acceleration sensor (2) and a signal processing unit (3) which are fixedly secured in a single rigid and massive body (4) rigidly fastened to the bag (1). Integrated triaxial acceleration gauges can be chosen as a sensor. For short bags, one sensor is used and located in the geometrical center of an impact area, which is also the center of gravity of the bag. For long bags, the optimal option is three sensors which must be located in a vertical position along the central axis of the bag at the same distance which is equal to or less than the small diameter of the bag. The absence of mechanical parts in the device structure and the necessity of calibration thereof and the use of high-quality punch bags make it possible to produce a highly reliable, easily producible and accurate device.

Description

SILOMER SIMULATOR FOR MEASURING DYNAMIC PARAMETERS

HIT.

The invention relates to simulators for boxing and other types of power martial arts, where it is required to evaluate the strength and energy of an athlete’s blow, his physical form and even the level of boxing skill, and can also be used as an entertainment attraction.

Currently, there are many different devices in the world, from cheap and simple to expensive and technically sophisticated, allowing you to measure the strength of the blow in martial arts. Moreover _{, for} all manufacturers, the measurement results, as a rule, differ significantly, although they all claim to be correct measurements.

The most common sensors used to measure impact force are strain gauges, piezoresistive, and piezoelectric force sensors. All of them are calibrated, have high accuracy and are actively used to measure the impact force in technological processes, since they were developed for these purposes. But blows, as a rule, are not applied to sensors, but to parts or elements used in the technological process. Pressure is transmitted to the sensors through materials or media that have completely different properties. Naturally, having after the impact at the output of the sensors only the shape of the shock pulse, we can talk about the strength of the impact only in some relative units. When performing technological operations, the absolute values of the impact force, as a rule, are not important. Nevertheless, the calibration of measurements, even in cases where the properties, sizes and shape of the colliding bodies does not change, is very complicated.

When measuring in sports, blows are also applied not to hard sensors, but to various damping pads and devices that protect the hands of athletes from possible injuries. And when it is necessary to obtain absolute values of the force of impacts, the task becomes complicated and becomes practically unsolvable even in the case of choosing one target target, since the shock limbs are different, and the shock standard does not exist. Thus, by measuring the impact force using these sensors, they ultimately measure the force arising from the impact and try to interpret it as the desired impact force, and it is determined by the laws of physics by the elastic properties of the target and impact limb, as well as their size, shape and relative speed of movement. Thus, even considering the blow as

one

SUBSTITUTE SHEET (RULE 26) the collision of two bodies (shock limb and target) with certain properties, shape and mass, it is not possible to carry out an unambiguous calibration. The blow is much more complex and long-lasting than a simple collision. Therefore, having only the shape of the shock pulse and not having a full calibration, it is impossible to obtain correct results when measuring the force and energy of the impact using strain gauges, piezoresistive and piezoelectric force and pressure sensors.

Closest to the proposed device is a dynamometer simulator for boxing and other martial arts for determining impact parameters, which consists in measuring the pressure at the time of impact on a target, which is used as a boxing bag (see RF patent N ° 2265470, IPC A63B69 / 32). The simulator contains a suspended impact projectile, inside of which there is an elastic capsule connected to the display unit by means of a pressure sensor installed inside the capsule, and one or more functional transducers of the pressure sensor signal. The elastic capsule is made of a viscoelastic incompressible material, and a membrane type piezoelectric transducer equipped with a sub-membrane chamber is installed as a pressure sensor, while the inputs of the functional transducers are connected directly to the piezoelectric transducer of the piezoelectric transducer directly or through a matching element. Functional converters and display unit are made on the basis of a computer, while the sound card of the computer is used as an input of functional converters.

The disadvantage is the inaccuracy of the measurement results for the reasons described above.

The basis of the present invention is the task of creating a simple and at the same time high-tech and reliable device that allows you to measure the strength and energy of an athlete’s impact in numerical equivalent, as well as evaluate the athlete’s physical form and level of boxing skill. The technical result consists in increasing the accuracy of measuring the impact strength of athletes using standard boxing bags, eliminating the need for calibration.

The problem is solved in that in the treadmill-simulator containing a boxing bag, with at least one sensor located in it

SUBSTITUTE SHEET (RULE 26) connected to the signal processing unit, connected to the display unit, according to the solution, the sensors and the processing unit are fixedly located in a single, rigidly fixed in the bag housing having a rigid structure and a shape similar to the shape of the bag, the thickness of the packing layer is the same in the impact zone, surface material the housing is selected from the condition of providing adhesion to the stuffing material of the bag, and a triaxial accelerometer is selected as the sensor.

A single sensor can be used in the simulator, while it is located in the geometric center of the impact zone, which is also the center of gravity of the bag, while the ratio of the length of the bag to its diameter does not exceed 1.7. There can be two sensors, while they are located along the central axis of the bag at the edges of the housing or at a distance equal to or less than the diameter of the bag. The number of sensors can be three or more, while they are vertically along the central axis of the bag at the same distance equal to or less than the diameter of the bag, and the ratio of the length of the bag to its diameter is more than 1.7. The simulator may have a second mode of operation, in which the sum of the energies or impact forces (tonnage) for a certain period of time is displayed, which allows us to evaluate not only the physical form of athletes, but also the level of boxing skill.

The simulator may further comprise a coin acceptor; connected to the display unit and configured to return coins, provided that the numerical expression of the result of the blow on the indicator will contain two or three identical digits. The simulator may further comprise one or two sensors of angular accelerations located on the housing at the maximum distance from the vertical and horizontal axis of the bag. The invention is illustrated by drawings, where fig.l trainer presented with a single sensor disposed at the center of gravity coinciding with the geometric center of the deposition zone ud ^'moat; figure 2 is one of the possible forms of the bag; in Fig.Z - version of the simulator with three sensors located vertically along the central axis of the bag, where 1. a boxing bag (target);

2. acceleration sensor;

3. signal processing unit;

4. housing;

5. display unit;

SUBSTITUTE SHEET (RULE 26) 6. coin acceptor;

7. D- diameter of the bag;

8. L- bag height;

9. F-vertical size of the striking zone. The simulator contains a boxing bag 1. All standard boxing bags for our task can be divided into two groups: short if L / D <1.7 and long if L / D> 1.7. Short bags can also include all pear-shaped bags, as well as bags having the shape shown in figure 2. In the latter case, only the dimensions of the massive part of the bag are taken into account.

In the case of a short bag, the size of the striking zone F is approximately equal to the diameter of the bag D, therefore, placing the sensor in the geometric center of the striking zone coinciding with the center of gravity of the bag, all strokes delivered with the same force in the direction of the sensor at any point in the zone will have the same * value.

The acceleration sensor 2 and the signal processing unit 3 are fixedly mounted in a single rigid and massive body 4, rigidly attached to the bag 1. Integrated capacitive three-axis accelerometers can be selected as a sensor, the high linearity and accuracy of which will allow you to do without calibration.

To measure the impact force with high accuracy, ideally, the target should be a round, hard, hard ball with a sensor in the center, covered with a soft and light layer of material that protects the limbs of athletes from damage. The entire design development of the simulator is aimed precisely at turning the standard boxing bag into an ideal target for accurate measurements, while preserving the original quality characteristics of the bag.

The housing 4 in the presented embodiment is attached to the material of the bag 1 using a disk rigidly fastened to the housing, so that during operation the acceleration sensor 2 does not change its position. The transverse size of the case is selected on the one hand as maximum as possible to increase the accuracy of measurements, on the other hand, the thickness of the packing layer of the bag in the case of a metal case should not be less than 8-12 cm, so that when you hit it does not feel the presence of a case with a sensor. The shape of the case must match

SUBSTITUTE SHEET (RULE 26) the shape of the bag, and the thickness of the packing layer should be constant, especially in the area of impact. The material of the surface of the body and its relief are selected from the condition of ensuring maximum adhesion to the stuffing material of the bag. Options are to use a case with a ribbed rubberized surface or simply paste over the case with printed material, which usually includes rubber crumb. Such shape, dimensions and surface properties exclude layer-by-layer displacement of the stuffed bag material during impacts, which would distort the result * of measurements. The housing 4 is made so that when it is placed in the bag 1, the center of gravity of the bag coincides with the geometric center of the impact zone and the location of the sensor 2.

The signal processing unit 3 has a wired or wireless connection with the display unit 5 located outside the bag 1. The simulator can be equipped with a coin acceptor 6, which is connected to the display unit 5. The coin acceptor 6 is configured to return the entered coins according to a certain algorithm.

In the case of long bags (L / D> 1.7), when the sensor is one and is in the center of gravity of the bag, the measurement accuracy decreases, since when the impact reaches 1000 kG, the structural rigidity becomes insufficient. Since the weight of the construction r is limited by technical means, we cannot increase rigidity. Enter some coefficients in the calculation formulas too, since they should depend on the place of the strike. When the device contains two or more sensors connected to the signal processing unit, the sensors are arranged vertically along the central axis of the bag. The whole bag is as if divided into parts of the same mass, and the vertical size of each part should be less than the diameter of the bag. An acceleration sensor is placed at the center of gravity of each such part. All this is done to simplify the procedure for calculating the impact force on this design. In this case, by analyzing the nonlinear dependence of vertical acceleration, one can not only accurately calculate the impact force, but even determine the approximate location of the impact. As a rule, 3-5 sensors are enough. For long bags, the requirements for the quality of the packing material also increase - for the accuracy of measurements, vertical changes in the density of the packing material are undesirable during the operation of the bag.

Processing unit 3 (for one sensor) analyzes the values of the accelerations of the center of gravity of the boxing bag 1 coming from the acceleration sensor 2. On

SUBSTITUTE SHEET (RULE 26) On the basis of these data, the beginning and end of the impact are determined (impact time), the maximum value of the target acceleration during the impact, the maximum value of the impact force is calculated, as well as the kinetic energy of the bag after the impact (impact energy). All these data are displayed on display unit 5. In the second simulator operation mode, on display unit 5, the sum of the impact energies is displayed — to determine the physical fitness level, or the sum of the impact forces (the so-called impact tonnage) —to determine the level of boxing skill. Since this mode is used when simulating a boxing match - on the display unit 5 the round number is displayed, the number of strikes inflicted and the time is counted down. At the beginning and at the end of the round, the simulator makes a sound similar to the sound of a gong.

The advantage of this simulator is that blows to the bag can be applied not in a specific, but in any direction, except for blows from above. Although, using a different design of the suspension of the target, you can measure the strength and such impacts.

To increase the accuracy of measurements _^ in cases when the impact was not directed to the center of gravity of the bag and part of the impact energy was spent on the rotation of the bag, it is possible to install an additional one or two sensors of angular accelerations, which take into account the force that rotates the bag around the vertical and horizontal axis and the energy of this rotation. Sensors in this case can be located on the disk with which the housing is attached to the bag. One sensor is located in the center of the disk and the other on the edge.

This simulator allows you to not lose the accuracy of measurements even in the case of applying a quick series of strokes, when the bag sways and does not have time to take its original position. This allows you to summarize the energy or power of strikes with high accuracy and correctly evaluate not only the physical form of an athlete, but also the level of boxing skill. For example, in the mode of determining the physical form of an athlete, a boxing match is imitated with 3 or 12 rounds of three minutes with a one-minute break. Summing up the energy of strokes during the fight, you can easily evaluate the athlete's physical form. Summing up the power of strikes (the so-called tonnage), one can also evaluate the level of boxing skill, since the skill of a boxer lies precisely in striking maximum strength with less energy.

SUBSTITUTE SHEET (RULE 26) The absence of mechanical parts and calibration in the device, as well as the use of high-quality boxing bags makes this device highly reliable, technologically advanced and accurate. The simulator finally solves the problem of reliability of measurements of impact force in martial arts, and also solves the important question of assessing the physical form and level of boxing skill of athletes.

SUBSTITUTE SHEET (RULE 26)

Claims

CLAIM

1. A simulator-dynamometer for measuring dynamic parameters of an impact, comprising a boxing bag, with at least one sensor located therein and a signal processing unit from the sensor connected to an indication unit, characterized in that the sensors and the processing unit are stationary a single, rigidly fixed in the bag, body having a rigid structure and shape similar to the shape of the bag, the thickness of the packing layer is the same in the impact zone, the surface material of the body is selected from the condition of adhesion to the material bivki bag, and as selected triaxial accelerometer sensors.

2. The simulator according to claim 1, characterized in that the sensor is one and is located in the geometric center of the impact zone, which is also the center of gravity of the bag, while the ratio of the length of the bag to its diameter does not exceed 1.7.

3. The simulator according to claim 1, characterized in that the number of sensors is two, while they are located along the central axis of the bag at the edges of the body or at a distance equal to or less than the diameter of the bag.

4. The simulator according to claim 1, characterized in that the number of sensors is three or more, they are located vertically along the central axis of the bag at the same distance equal to or less than the diameter of the bag, while the ratio of the length of the bag to its diameter is more than 1.7.

5. The simulator according to claim 1, wherein the signal processing unit is configured to operate in two modes: a mode for measuring force, impact energy and collision time, and a mode for measuring the sum of energies or impact forces over a certain period of time.

6. The simulator according to claim 1, characterized in that a coin acceptor is inserted into it, configured to return coins, provided that the numerical expression of the impact result on the indicator contains two or three identical digits.

7. The simulator according to claim 1, characterized in that it further comprises one or two angular acceleration sensors located on the housing at a maximum distance from the vertical and horizontal axis of the bag.

SUBSTITUTE SHEET (RULE 26)