TW201934174A - Ball hitting force measurement system and measuring method thereof that enables a user to instantly evaluate the performance of each swinging - Google Patents

Abstract

This invention relates to a ball hitting force measurement system, and a measuring method thereof, mainly comprising a strain detector, an angular speed detector, and a calculation unit, wherein the calculation unit converts an amount of deformation measured by the strain detector into a torque value at a hitting position and calculates a product of the torque value and an angular speed to obtain a ball hitting force value. Accordingly, this invention measures the deformation amount of a handheld object hitting a ball and the angular speed of swinging and makes an operation on the measured values to obtain the ball hitting force. This manner is very accurate and requires no complicated calculation with relatively low need hardware. Furthermore, the measured ball hitting force can not only be used for evaluating ball hitting performance, but also estimate a hitting distance and the position of hitting point, so as to enable a user to instantly evaluate the performance of each swinging.

Description

Hitting force measuring system and measuring method

The invention relates to a hitting force measuring system and a measuring method thereof, and more particularly to a system and method suitable for measuring a hitting force when a sports equipment is used for hitting a ball.

All athletes, whether professional or amateur, are committed to the pursuit of perfect performance. Taking golf as an example, all athletes are pursuing strong impact strength and accurate impact points. However, the intensity of impact In addition to the distance to the shot, the strength of the shot can also show the hitting point in time, that is, whether the hitting point is located at the best hitting position on the golf club head, which is commonly known as the sweet spot. However, as of now, there is no related technology that can measure the impact strength when hitting a ball and accurately predict the impact point.

Please refer to Chinese Patent Publication No. 201625337 "Motion Analysis Device, Motion Analysis Method, Program, Recording Medium, and Motion Analysis System", which discloses the calculation of the impact from the ball set on the sports equipment based on the angular velocity generated by the club when hitting the ball. The distance from the reference position of the hitting surface to the hitting position, that is, the distance between the actual hitting position and the correct position (sweet point). However, this prior art method of calculating the impact position from the angular velocity alone requires complex calculations and corrections. To be tested.

Furthermore, please refer to Chinese Patent Publication No. 200934560 "hitting position detection device and hitting position detection method", which discloses that an image sensor is set on the club, and the electric signal output from the image sensor is calculated when hitting Hitting position. Similarly, the method of calculating the shot position by using the image in this prior art has also undergone complicated calculations and corrections, and its accuracy remains to be tested.

In addition, there are many previous technologies that attempt to analyze batting performance based on motion and posture. For example, Chinese Patent Bulletin No. I341480 "Analysis Method and System for Human Motion Distribution" (hereinafter referred to as the prior art 1) and Bulletin No. I359336 "Watch-type motion trajectory analysis device" (hereinafter referred to as the prior art 2). Among them, the above-mentioned prior art 1 is disclosed that the user's arm is equipped with several acceleration sensing modules, and uses the measured acceleration value to derive the acceleration displacement trajectory data and acceleration displacement graph, and finally obtains the analysis of human motion distribution. . In addition, the aforementioned prior art 2 discloses a wristwatch with a multi-axis trajectory sensor, and uses the trajectory measured by the wristwatch to present the used hand movements. However, the previous techniques of shangkai are only for analyzing the posture of the human body during movement, and are not involved in the measurement or analysis of the batting performance.

The main object of the present invention is to provide a hitting force measuring system and a measuring method thereof, which can accurately measure the hitting force for evaluating the hitting performance.

To achieve the above object, the present invention provides a hitting force measurement system, which mainly includes a strain detector, an angular velocity detector, and an operation unit. The strain detector is set on a hand-held object. And is suitable for measuring the amount of deformation when the hand-held object hits the ball; the angular velocity detector is arranged on a hand-held object and is suitable for measuring the angular velocity when the hand-held object hits the ball; the computing unit is electrically coupled to the strain Detector and angular velocity detector; and the arithmetic unit converts the deformation value measured by the strain detector into a moment value of a shot position, and calculates a product of the moment value and the angular velocity to obtain a shot force value.

According to this, the hitting force measurement system of the present invention measures the amount of deformation of the hand-held object when hitting the ball and the angular velocity when swinging, and calculates it to obtain the hitting force. This method is quite accurate and does not require complicated calculations. The requirement for hardware is low, and the measured impact strength can be used to evaluate the performance of the impact, and to estimate the impact distance and the position of the impact point, which is an extremely creative invention.

Furthermore, the strain detector of the hitting force measuring system of the present invention can be set at a strain measuring position, which can be located near the hitting position on the handheld object; and the arithmetic unit calculates the product of the deformation amount and the elastic coefficient of the handheld object The stress value of the strain measurement position is obtained, and the stress value of the strain measurement position is converted into a force value. Then, the relationship between the force arm and the torque is used to obtain the force value of the impact position, and then the impact position is determined. The force value is converted into a moment value.

Among them, the relationship between the force arm and the moment adopted in the present invention is exemplified as follows: the hand-held object may include a hand-held portion, and the distance between the hand-held portion and the strain measurement position is a first distance, and the distance between the hand-held portion and the hitting position is Distance; and the arithmetic unit calculates the product of the force value of the strain measurement position and the ratio of the first distance and the second distance to obtain the force value of the hit position. In other words, the present invention can use the theory of Cntilever Beam The force arm and moment principle are used to calculate the stress at the impact point for calculating the impact force.

In addition, the hitting force measurement system of the present invention may further include a memory unit electrically coupled to the computing unit, and the memory unit may store a hitting performance conversion table and a hitting distance conversion table; the hitting performance The conversion table can record the multiple hitting power values and their corresponding multiple hitting scores, and the hit distance conversion table can record the plural hitting power values and their corresponding plural hitting distances; the calculation unit can calculate the calculated hits The ball power value is compared with the hit performance conversion table to obtain a corresponding hit score, or the hit distance conversion table is compared to obtain a corresponding hit distance. According to this, the present invention can convert the calculated hitting force value into a hitting performance, such as presenting the hitting performance in a fractional manner; moreover, the hitting force value can also be converted into a prediction of the hitting distance.

Preferably, the hitting force measurement system of the present invention may further include a wireless transmission module and an external display device, wherein the wireless transmission module is electrically coupled to the computing unit, and the computing unit can control the impact force The value is transmitted to the external display device through the wireless transmission module. That is, the present invention can immediately transmit the results of each swipe to an external display device such as a smart phone, smart watch, or other electronic device through a wireless transmission method, so that the user can immediately obtain Know the performance of each swing.

In order to achieve the above object, the present invention provides a method for measuring a stroke force, including the following steps: First, a strain detector is used to measure the amount of deformation when a handheld object is hit by a ball, and an angular velocity detector is used to measure the impact of the handheld object Angular speed at the time of the ball; then, it is converted into a stroke based on the amount of deformation The moment value of the position, and the product of the moment value and the angular velocity is calculated to obtain the hitting force value. According to this, the present invention provides a method for measuring the impact strength in real time. Through simple hardware configuration and simple calculation mechanism, extremely accurate results can be obtained, and it can further be used to calculate the impact distance. You can simply score and compare, so that users can clearly and immediately know the performance of each hit.

2‧‧‧ Strain Detector

3‧‧‧Angular Velocity Detector

4‧‧‧ Computing Unit

5‧‧‧Wireless transmission module

6‧‧‧External display device

7‧‧‧memory unit

71‧‧‧ Batting Performance Conversion Table

72‧‧‧ Hit Distance Conversion Table

81‧‧‧Circuit Board

82‧‧‧Electronic device

D‧‧‧Battery distance

L ₁ ‧‧‧First distance

L ₂ ‧‧‧Second Distance

O‧‧‧Handheld

O _h ‧‧‧Handheld

P _h ‧‧‧ Batting position

P _e ‧‧‧ strain gauge position

F _h ‧‧‧ Force value at impact position

F _e ‧‧‧ Force value at the strain gauge position

FIG. 1 is a schematic diagram of a first embodiment of the present invention.

FIG. 2 is a system architecture diagram of the first embodiment of the present invention.

FIG. 3 is a schematic diagram of determining the stress value of the impact position by using the relationship between the arm and the moment in the first embodiment of the present invention.

FIG. 4 is a schematic diagram of a second embodiment of the present invention.

FIG. 5 is a schematic diagram of a third embodiment of the present invention.

FIG. 6A is a schematic diagram of a fourth embodiment of the present invention.

FIG. 6B is a schematic diagram of a fifth embodiment of the present invention.

Before the batting force measuring system and measuring method of the present invention are described in detail in this embodiment, it should be particularly noted that in the following description, similar elements will be represented by the same element symbols. Furthermore, the drawings of the present invention are only for illustration, they are not necessarily drawn to scale, and not all details are necessarily presented in the drawings.

Please refer to FIG. 1 and FIG. 2 at the same time. FIG. 1 is a schematic diagram of the first embodiment of the present invention, and FIG. 2 is a system architecture diagram of the first embodiment of the present invention. As shown in the figure, this embodiment is described using golf as an example. However, the present invention is not limited to this, and any sports using a sports equipment to perform a batting action may be applicable to the present invention.

Furthermore, the main hardware components of this embodiment include a strain detector 2, an angular velocity detector 3, an arithmetic unit 4, a wireless transmission module 5, an external display device 6, and a memory unit 7. Among them, the arithmetic unit 4 as a whole The operating core of the system may include a microprocessor (MCU) and a circuit board, and the strain detector 2, the angular velocity detector 3, the wireless transmission module 5, and the memory unit 7 are electrically coupled to the operation unit 4. .

In addition, the strain detector 2 is mainly used to measure the amount of deformation ε when the club receives the impact force of the ball when the golf club (handheld object O) hits the ball. Detecting a strain of the strain gauge 2 may or Wheatstone bridge (Winston Birdge), disposed adjacent to one of the hitting positions P _h strain detection position P _e to the held object O, based on the present embodiment will be Strain gauges are assembled on the part of the golf club close to the head. Usually, the strain on the part is large, so the final calculation result will be more accurate.

In addition, the angular velocity detector 3 is mainly used to measure the angular velocity ω of the hitting point when the golf club (handheld object O) hits the ball. In this embodiment, a gyroscope is used, and it is mounted on the ball head. P _h at ball position, whereby the ball can accurately position P _h angular velocity values measured when each swipe. Of course, the angular velocity detector 3 of the present invention can also use an integrated chip for angular velocity and acceleration measurement, such as a digital motion processor (Digital Motion Processor (DMP) for short) that combines a three-axis gyroscope and a three-axis accelerometer. movement detecting the direction of rotation strike the ball accurately position P _h, except for calculating the strength of the ball, but also traceability swing trajectory of the ball striking position P _h, to facilitate the subsequent further movement of the gesture analysis.

Furthermore, the memory unit 7 of this embodiment may be any type of fixed or removable random access memory (RAM), read-only memory (ROM), and flash memory. Flash memory, hard disk, or other similar devices or a combination of these devices. In addition, the memory unit 7 of this embodiment stores a shot performance conversion table 71 and a shot distance conversion table 72, and the manner and function of these conversion tables will be described in detail.

Moreover, the wireless transmission module 5 of this embodiment may be infrared communication, radio frequency communication, Bluetooth communication, wireless network communication (Wi-Fi), global interoperable microwave access (WiMax), ZigBee, third Generation Mobile Communications (3G), 4th Generation Mobile Communications (4G), 5th Generation Mobile Communications (5G) or other equivalent wireless transmission modules. The wireless transmission module 5 is used to connect to an external display device 6 to transmit the calculated impact strength and other sports data to the external display device 6 so that the user can immediately know the performance of each swing . The external display device 6 may be a smart phone, a smart watch, a tablet computer, or other equivalent or dedicated electronic devices. This embodiment uses a smart watch.

The operation flow of this embodiment is detailed below. First, when a user swings a golf club (handheld object O) for a batting action, the strain detector 2 then measures the deformation of the strain measurement position P _e when hitting the ball. Ε is measured, and the angular velocity detector 3 also measures the angular velocity ω of the impact position P _{h at the time} of impact. At this time, the arithmetic unit 4 first obtains the stress value σ _e of the strain measurement position P _e by the following calculation formula (1).

σ _e = ε × E _o ...... (1)

Among them, σ _e is the stress value of the strain measurement position P _e , ε is the amount of deformation measured by the strain detector 2, and E _o is the elastic constant of the hand-held object O.

Then by arithmetic unit 4 is calculated by the following formula (2) obtained by strain measurement position value of the force P _e F _e, i.e. the stress value of the variable to be calculated detection position P _e of σ _e 2 strain detecting area A ₂ Of the product.

F _e = σ _e × A ₂ ... (2)

Wherein, F _e is the strain measuring position of the force value P _e, σ _e is the strain detection position P of the stress value _e, A ₂ is 2 strain detecting area.

Please refer to FIG. 3 together. FIG. 3 is a schematic diagram of determining the stress value of the impact position by using the relationship between the arm and the moment in the first embodiment of the present invention. Next, the force value F _h at the point of impact is calculated based on the arm and moment principle of the Cntilever Beam theory. In this embodiment, a grip portion (hand-holding portion O _h ) of a golf club (hand-held object O) is used as a fulcrum, and there is a first interval between the hand-holding portion O _h and the strain measuring position P _e provided by the strain detector 2 distance L _1, and the holding portion and the spacer between O _h P _h a ball position a second distance L _2. At this time, the arithmetic unit 4 obtains the force value F _h of the impact position P _h by the following calculation formula (3).

F _h = F _e × L ₁ / L ₂ ... (3)

Among them, F _h is the force value of the hitting position P _h , F _e is the force value of the strain measuring position P _e , L ₁ is the distance between the hand-held O _h and the strain measuring position P _e , L ₂ It is the distance between the ball and the hand portion position O _h P _h.

Further, the arithmetic unit 4 converts the force value F _h of the impact position P _h into a moment value τ _h according to the following calculation formula (4).

τ _h = F _h × L ₂ ... (4)

Wherein, τ _h is a moment value of the batter P _h, F _h is the value of the force of the ball striking position P _h, L ₂ is the distance between the holding portion and the batter O _h P _h; in other words, calculated ball P _h of the position of the force F _h and a second value which is the product of the distance of the arm length L ₂ can be obtained in the ball striking position of the torque value P _h τ _h.

Finally, the arithmetic unit 4 calculates the product of the moment value τ _h and the angular velocity ω of the impact position P _h to obtain the impact power value P; that is, the impact power value P is obtained by the following calculation formula (5).

P = τ _h × ω ... (5)

However, in this embodiment, the hitting force value P obtained through the above calculation formula is presented in a power manner, that is, the amount of work per unit time in each hit, so the force or Batting performance. In fact, in addition to the impact force value P calculated in this step, it can also be used to predict the impact distance and estimate the impact point.

To further explain, the hitting performance conversion table 71 and the hitting distance conversion table 72 previously stored in the memory unit 7 of this embodiment can be established based on the experience of a general user. Taking the golf ball of this embodiment as an example, it is possible to separately record the hitting force value P measured by the user with different strength swings to estimate his hitting performance S to form a hitting performance conversion table 71; that is, the following table a presenter, a plurality of the power stroke is recorded values P _1, P ₂ ... P _n and the corresponding fraction of the plurality of shot _{S 1, S 2 ... S n} .

On the other hand, the hitting distance conversion table 72 can be established in advance by recording the hitting force value P and the hitting distance D formed by the user as they swing with different strengths; that is, as shown in Table 2 below. The hitting distance conversion table 72 records plural hitting power values P1, P2 ... Pn and their corresponding plural hitting distances D1, D2 ... Dn. However, it should be specifically stated that the data provided in Tables 1 and 2 are not measured values in actual use, and are used for illustration only.

According to this, the computing unit 4 can search the ball performance conversion table 71 of the above table 1 according to the ball power value P obtained by the aforementioned calculation formula (5) to evaluate the ball performance S of this time, and present the ball performance. Similarly, the computing unit 4 may search the hitting distance conversion table 72 of the second table according to the obtained hitting force value P to estimate the hitting distance D of this time. Finally, as shown in FIG. 1, the shot score S and the shot distance D of the swing are transmitted to the external display device 6 through the wireless transmission module 5 for display, so that the user can immediately know the performance of the swing . Furthermore, the closer to the correct hitting area (sweet point), the higher the hitting power value P, so the hitting power value P can also show the position of the hitting point in time.

Please refer to FIG. 4 and FIG. 5 at the same time. FIG. 4 is a schematic diagram of the second embodiment of the present invention, and FIG. 5 is a schematic diagram of the third embodiment of the present invention. fact In the above, these diagrams are mainly used to explain that the hitting force measuring system and method of the present invention can be applied to any sports field that uses sports equipment for hitting, such as the golf game shown in the first embodiment, and the second The baseball game shown in the embodiment and the tennis game shown in the third embodiment.

Please refer to FIGS. 6A and 6B at the same time. FIG. 6A is a schematic diagram of the fourth embodiment of the present invention, and FIG. 6B is a schematic diagram of the fifth embodiment of the present invention. The main difference between the fourth embodiment and the previous embodiment is that this embodiment is a strain detector 2, an angular velocity detector 3, an arithmetic unit 4, a memory unit (not shown in the figure), and a wireless transmission module (in the figure). (Not shown) is integrated on a circuit board 81 for easier installation. Among them, since the strain detector 2 needs to be directly attached to the surface of the rod body, the actual sensing portion is additionally pulled out from the circuit board 81. In addition, the above components can also be integrated on an independent electronic device 82, as shown in FIG. 6B, so that consumers can assemble on the sports equipment they want to operate by themselves.

In summary, this embodiment has at least the following innovative effects and advantages:

1. When the user is exercising, he can immediately know the performance of each swing, such as the impact strength, distance, performance score, and impact position;

2. The calculation method provided by this embodiment is simple and quite accurate, and can accurately show the performance of each swing;

3. In this embodiment, the present invention can be implemented by using a common gyroscope, a strain gauge, and a general single-chip processor, which is simple in structure, low in cost, and reliable;

4. The angular velocity detector of this embodiment can be expanded into a digital motion processor, so that it can track the swing track in addition to the calculation of the impact force. Traces to facilitate further analysis of motion posture.

5. All components can be integrated on a circuit board for easy installation; in addition, all components can be configured as an independent electronic device, allowing consumers to assemble on their own sports equipment.

The above embodiments are merely examples for the convenience of description. The scope of the claimed rights of the present invention should be based on the scope of the patent application, rather than being limited to the above embodiments.

Claims (10)

A hitting force measuring system includes: a strain detector arranged on a hand-held object, the strain detector is suitable for measuring the amount of deformation when the hand-held object hits a ball; an angular velocity detector Is arranged on the hand-held object, the angular velocity detector is suitable for measuring the angular velocity of the hand-held object when hitting the ball; and an arithmetic unit is electrically coupled to the strain detector and the angular velocity detector. The calculation unit converts the deformation value measured by the strain detector into a moment value of a shot position, and calculates a product of the moment value and the angular velocity to obtain a shot force value. For example, the ball force measurement system of claim 1, wherein the strain detector is set at a strain measurement position, which is located on the hand-held object adjacent to the ball hit position; the calculation unit calculates the deformation amount and The product of the elasticity coefficient of the hand-held object is used to obtain the stress value of the strain measurement position, and the stress value is converted into a force value, and then the relationship between the force arm and the moment is used to obtain the force value at the impact position. The force value of the hitting position is converted into the moment value of the hitting position. For example, the hitting force measurement system of claim 2, wherein the hand-held object includes a hand-held portion, and the hand-held portion is separated from the strain measurement position by a first distance, and the hand-held portion is separated from the ball-hitting position by a first distance Two distances; the operation unit calculates the product of the force value of the strain measurement position and the ratio of the first distance and the second distance to obtain the force value of the impact position. If the impact force measurement system of claim 1 further includes a wireless transmission A module and an external display device, the wireless transmission module is electrically coupled to the operation unit, and the operation unit controls transmission of the hitting force value to the external display device through the wireless transmission module. For example, the hitting force measuring system of claim 1 further includes a memory unit electrically coupled to the computing unit. The memory unit stores a hitting performance conversion table which records a plurality of hitting force values. And its corresponding plural hitting scores; the operation unit calculates the hitting force value ratio calculated from the hitting performance conversion table to obtain the corresponding hitting scores. For example, the hitting force measurement system of item 5, wherein the memory unit further stores a hitting distance conversion table, which records the plural hitting force values and the corresponding plural hitting distances; the computing unit calculates Then, the hitting force value ratio is obtained from the hitting distance conversion table to obtain the corresponding hitting distance. A method for measuring a hitting force includes the following steps: (A) measuring a deformation amount when hitting a ball with a hand-held object through a strain detector; and measuring an amount when the hand-held object hits a ball through an angular velocity detector. Angular velocity; and (B) converting the amount of deformation into a moment value at the impact position, and calculating the product of the moment value and the angular velocity to obtain a hitting force value. The method for measuring a batting force of claim 7, wherein the hand-held object includes a hand-held part, and the hand-held part is at a first distance from a strain-measuring position set by the strain detector, and the hand-held part and a There is a second distance between the hitting positions; this step (B) includes the following steps: (B1) Calculate the product of the amount of deformation and the coefficient of elasticity of the hand-held object to obtain the stress value of the strain measurement position, and convert the stress value into a force value; (B2) calculate the strain measurement position. The product of the force value and the ratio of the first distance and the second distance is used to obtain the force value of the impact position; (B3) Converting the force value of the impact position to the moment of the impact position And (B4) calculate the product of the moment value of the impact position and the angular velocity to obtain the impact force value. For example, the method for measuring a hitting force of item 7, further comprising the following steps after step (B): (C) searching a hitting performance conversion table according to the hitting force value to obtain a hitting score; The hit performance conversion table records plural hit power values and corresponding plural hit scores. For example, the method for measuring the hitting force of item 9 further includes the following steps after step (C): (D) searching a hitting distance conversion table according to the hitting force value to obtain a hitting distance; The hitting distance conversion table records plural hitting force values and corresponding plural hitting distances.