TWI382169B - Apparatus of measuring momentum of inertial of human body - Google Patents

Description

Human body inertia measurement device

The present invention relates to a measuring device, and more particularly to a human body inertia measuring device.

The relationship between the angular acceleration of the object and the moment of inertia is inversely proportional, that is, the larger the moment of inertia, the smaller the angular acceleration, and vice versa. In a lot of sports, such as skating, horizontal bar, gymnastics or ballet dance, the purpose of acceleration or deceleration is achieved by changing the moment of inertia during the rotation. For example, in the case of ice skating, athletes double When the hand is opened for fixed-point rotation, the moment of inertia is large, so the angular acceleration during rotation is slow, and when the athlete gradually moves his hands toward the body, the moment of inertia is gradually reduced, which will increase the angular acceleration when the player rotates. Since the moment of inertia of the human body changes with the movement, the general athlete can only find the action of increasing or decreasing the moment of inertia by continuous practice while performing the training, and the obtained action is not necessarily the best, that is, the athlete's The motion does not achieve the angular acceleration expected when rotating, so the best way to obtain the required moment of inertia remains to be studied.

Accordingly, it is an object of the present invention to provide a human body moment of inertia measuring device that achieves the optimum action of the required moment of inertia.

Another object of the present invention is to provide a method of measuring the moment of inertia of a human body that achieves the optimum action of the required moment of inertia.

Therefore, the human body inertia measurement device of the present invention comprises a frame, a rotating unit, a driving unit, and an electronic control unit. The frame comprises a base, a column, and a plurality of pulleys. The column has an upright section extending from the base, and a bent section extending from the upright section away from the base, the pulleys are respectively Set in the straight section and the bent section. The rotating unit includes a rotating shaft rotatably disposed on the base of the frame, a turntable fixed to the rotating shaft and configured to drive the trainer to rotate, and a collecting line disposed under the rotating plate and fixed to the rotating shaft plate. The driving unit includes a passive member connected to the rotating shaft of the rotating unit, a driving device for detachably driving the rotating member, and a brake disposed on the base for holding the rotating shaft stationary. a flexible cord connected to the hub at one end and a weight member connected to the other end of the flexible cord and switchable between a ready state and an accelerated state, the flexible rope is wound Through the pulleys of the frame, the weight member is suspended statically in the column in the preparatory state, and the weight member moves to the ground in an accelerated state, and simultaneously pulls the flexible rope to drive the turntable Turn. The electronic control unit includes a rotational speed sensor that measures the rotational speed of the rotating unit of the rotating unit, and a terminal that is electrically connected to the rotational speed sensor and calculates a rotational inertia.

The utility model of the human body inertia measurement device of the present invention is that the electronic control unit measures the moment of inertia of the trainer when making different actions, and then the optimal action for obtaining the required moment of inertia can be further compared.

Therefore, the human body inertia measurement method of the present invention is applicable to a human body inertia measurement device, the measurement device includes an electronic control unit including a display, and a turntable. The measurement method is first measured by the electronic control unit. Calculate the no-load moment of inertia when the turntable does not carry the trainer, and then The electronic control unit measures and calculates the moment of inertia of the turntable carrying the trainer, and deducts the no-load moment of inertia, that is, the moment of inertia when the trainer rotates. Finally, the moment of inertia when the trainer rotates is output through the display.

The function of the human body moment of inertia measurement method of the present invention is that the electronic control unit measures the moment of inertia of the trainer when making different actions, and then the optimal action for obtaining the required moment of inertia can be further compared.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention.

Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Figures 1 and 2, a first preferred embodiment of the human body inertia measurement device of the present invention comprises a frame 1, a rotating unit 2, a driving unit 3, and an electronic control unit 4.

The rack 1 includes a base 11 , a column 12 , and a plurality of pulleys 13 and 13 a . The base 11 has a rotating portion 111 on the left and right sides of the column 12 and a buffer portion 112 having a cushion 113 . 12 has an upright section 121 extending from the base 11 and a bent section 122 bent from the upright section 121 to the buffer portion 112. The pulleys 13 and 13a are respectively disposed on the upright section 121 and a bending section 122, wherein the pulley 13a located at the bottom of the upright section 121 is yawable about an axis of the upright section 121, and the cushion 113 is used to buffer the weight member 35 of the driving unit 3 when it is dropped. The impact is strong.

The rotating unit 2 includes a rotating shaft 21 rotatably disposed on the rotating portion 111 of the frame 1, a turntable 22 fixed to the rotating shaft 21 for driving the trainer to rotate, and a rotating disc 22 disposed under the rotating plate 22 And a collecting disk 23 fixed to the rotating shaft 21.

The driving unit 3 includes a passive member 31 connected to the rotating shaft 21 of the rotating unit 2, a driving device 32 for detachably driving the rotating member 31, and a driving device 32 disposed on the base 11 for holding the rotating shaft 21 a stationary brake 33, a coil of flexible cord 34 received at the end of the hub 23 and connected to the hub 23, and a flexible cord 34 connected to the other end of the flexible cord 34 and in a ready state and an accelerated state The weight change member 35 is changed. The passive member 31 has a first sensing hole 311 and a second sensing hole 312 spaced apart in the circumferential direction.

Referring to FIGS. 3 and 4, the driving device 32 of the driving unit 3 has a motor 321 disposed on the base 11 of the frame 1 and having an armature shaft 361, a housing 322 connected to the motor 321, and a housing 322. Adjustably sleeved on the armature shaft 361 and extending through the sleeve 323 of the housing 322, detachably engaging the passive member 31 and extending from the sleeve 323 to one end of the housing 322 a connecting driving member 324, a set of journals 325 disposed on the sleeve 323, a set of springs 326 disposed on the sleeve 323 and abutting the journal 325 and the housing 322, and a spring 326 disposed on the housing a solenoid 327 of the 322, a core 328 disposed through the electromagnetic coil 327, and a shifting lever 329 pivotally connected to the core 328 for plucking the journal 325. The armature shaft 361 has a plurality of a toothed portion 363 formed on an outer surface 362, the sleeve 323 having a plurality of slots 365 formed on an inner surface 364 and engaging the teeth 363, in this embodiment The passive member 31 and the driving member 324 are both gears. The shifting lever 329 has a pivoting point 366 pivotally connected to the motor 321 . Thus, when the electromagnetic coil 327 is energized, the core 328 is attracted downward. When moving, the shift lever 329 will be deflected and the journal 325 will be moved to move the sleeve 323 upward, and the driving member 324 is thus engaged with the passive member 31. Conversely, as shown in FIG. When the electromagnetic coil 327 is not energized, the spring 326 abuts against the journal 325, the sleeve 323 will move downward to disengage the driving member 324 from the passive member 31, and the shift lever 329 is simultaneously The yaw causes the core 328 to move upward. The brake 33 can be a drum brake device or a disc brake device. In the embodiment, the brake 33 is a disc brake device, and includes a disc 331 disposed on the shaft 21, and a The base 11 is coupled to and detachably grips the caliper 332 of the disc 331. It should be noted that the driving device 32 and the brake 33 may be controlled by the electronic control unit 4 or respectively via a starter motor switch and a brake. The switch (not shown) is manually controlled. In the present embodiment, the drive unit 32 and the brake 33 are manually controlled via the starter motor switch and the brake switch, respectively. The flexible cord 34 is wound around the pulleys 13, 13a. It should be noted that the flexible cord 34 may be a nylon cord or a cable. In the present embodiment, the flexible cord 34 is a steel cord.

Referring to FIGS. 1 and 2, the electronic control unit 4 includes a rotational speed sensor 41 for measuring the rotational speed of the turntable 22, a terminal 42 electrically connected to the rotational speed sensor 41, and a display electrically connected to the terminal 42. And a limit switch 44 electrically connected to the brake 3. The terminal 42 is used to calculate the moment of inertia and electrically control the driving unit 32 of the driving unit 3, in this embodiment. The speed sensor 41 is an optical encoder and has a photocoupler 411 disposed on the base 11 of the frame 1 and corresponding to the sensing holes 311, 312 of the passive member 31. When the passive member 31 rotates in the counterclockwise direction, the first sensing hole 311 and the second sensing hole 312 sequentially pass through the optical coupler 411, thereby obtaining the angular displacement time.

Referring to Figures 1 and 5, when the moment of inertia measurement is to be performed on the trainer, the following steps 1 to 3 are performed: Step 1 is to establish a reference: in the case where the trainer does not stand on the turntable 22, via the starter motor switch The driving member 324 of the driving device 32 is manually controlled to be disengaged from the passive member 31, and the caliper 332 of the brake 33 is released from the disc 331 by the brake switch, and is suspended from the column 12 in a preliminary state. The weight member 35 will be freely dropped to be converted into an accelerated state, and the flexible cord 34 is simultaneously pulled to rotate the turntable 22. At this time, the sensing holes 311, 312 of the passive member 31 can be measured. When the trainer does not stand on the turntable 22, the angular displacement time t _{i of} the speed sensor 41 is sequentially passed, and then the signal is transmitted to the terminal unit 42 to calculate that the turntable 22 does not carry the trainer. The angular velocity ω _i and the no-load moment of inertia I _i , wherein the angular velocity ω _i and the no-load moment of inertia I _i are calculated according to the following formulas (1) and (2): θ: angular displacement; m: weight of the weight; g: gravitational acceleration; h: descending height of the weight.

When the weight member 35 is to be restored to the standby state, the driving member 324 is engaged with the passive member 31 by the starter motor switch, and the motor 321 (see FIG. 3) is driven to drive the hub 23 to take up the The flexible cord 34 is sufficient, and when the weight member 35 returns to the original height, the limit switch 44 is touched, so that the limit switch 44 electrically controls the caliper 332 to act to clamp the disc 331, thus, The weight member 35 is held at a fixed height.

Referring to Figures 6 and 7, the second step is measurement: the trainer is allowed to stand on the turntable 22 and perform a predetermined action, and the above-mentioned step 1 is performed to measure the no-load moment of inertia I _i , and the passive member 31 can be measured. When the training hole 311, 312 is in the trainer station, the angular displacement time t _f when the speed sensor 41 is sequentially passed, and then the signal is transmitted to the terminal 42 for calculation, the turntable 22 can be obtained. The angular velocity ω _f and the moment of inertia I _{f of the} trainer are obtained, wherein the angular velocity ω _f and the moment of inertia I _f are calculated according to the following formulas (3) and (4):

Then, by the terminal 42 operation, the moment of inertia I _{f is} deducted from the no-load moment of inertia I _{i to} obtain the moment of inertia I when the trainer rotates.

Step 3 is output: the moment of inertia I when the trainer is rotated is output through the display 43, so that the trainer knows the rotation habit corresponding to the predetermined action. Quantity I size.

It is worth noting that when step 2 is performed, the trainer can take a picture of the measurement process. Thus, if the trainer performs an action change during the measurement process, the time in the picture can be found. Corresponding moment of inertia.

It should be noted that the driving member 324 of the passive member 31 of the driving unit 3 may also be a pair of friction wheels. Thus, the motor 321 can also rotate the collecting tray 23 to retract the flexible cord 34.

Referring to Figures 8 and 9, a second preferred embodiment of the human body inertia measurement device of the present invention is different from the first preferred embodiment in that the column 12 of the frame 1 has a more upright segment. The cantilever segment 123 is bent in the direction of the rotating shaft 21 of the rotating unit 2, and the rotating unit 2 further includes a supporting base 24, and the rotating shaft 21 extends through the rotating plate 22 and is rotatably coupled to the cantilever segment 123 is connected, and the support base 24 is disposed on the rotating shaft 21 and supports the trainer to lie down, so that the trainer can perform the moment of inertia measurement when the horizontal bar is operated.

In summary, the driving unit 3 drives the trainer to rotate, and at the same time, the electronic control unit 4 is used to measure the moment of inertia of the trainer when making different actions, and then the optimal action for obtaining the required moment of inertia can be compared. It is indeed possible to achieve the object of the present invention.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

1‧‧‧Rack

11‧‧‧Base

111‧‧‧Rotation

112‧‧‧ buffer

113‧‧‧ cushion

12‧‧‧ column

121‧‧‧Upright section

122‧‧‧Bend section

123‧‧‧Cantilever segment

13‧‧‧ pulley

13a‧‧‧ pulley

2‧‧‧Rotating unit

21‧‧‧ shaft

22‧‧‧ Turntable

23‧‧‧Collection tray

24‧‧‧ support

3‧‧‧Drive unit

31‧‧‧ Passive parts

311‧‧‧First sensing hole

312‧‧‧Second sensing hole

32‧‧‧ drive

321‧‧‧Motor

322‧‧‧shell

323‧‧‧ bushings

324‧‧‧ drive parts

325‧‧‧ journal

326‧‧ ‧ spring

327‧‧‧Electromagnetic coil

328‧‧‧ iron core

329‧‧‧Shift lever

33‧‧‧ brake

331‧‧‧disc

332‧‧‧ calipers

34‧‧‧Flexible rope

35‧‧‧weight parts

361‧‧‧ armature shaft

362‧‧‧ outer surface

363‧‧‧ teeth

364‧‧‧ inner surface

365‧‧‧ cogging

366‧‧‧ pivot point

4‧‧‧Electronic control unit

41‧‧‧Speed sensor

411‧‧‧Optocoupler

42‧‧‧ Terminal

43‧‧‧ display

44‧‧‧limit switch

1 is a perspective view showing a first preferred embodiment of the human body inertia measurement device of the present invention; FIG. 2 is a schematic view showing the component arrangement relationship of the first preferred embodiment; FIG. 3 is a partial cross-sectional view FIG. 4 is a view similar to FIG. 3, illustrating a case where a driving member is detached from a passive member; and FIG. 5 is a flow chart illustrating the measurement of a rotation when a turntable does not carry a trainer. FIG. 6 is a perspective view showing a case where a weight is freely dropped to drive a turntable to rotate; FIG. 7 is a flow chart illustrating a flow of measuring a moment of inertia of a trainer; FIG. 8 is a perspective view. A second preferred embodiment of the human body moment of inertia measuring device of the present invention; and FIG. 9 is a side view showing a situation in which a user is placed in a horizontal position by a support base.

1‧‧‧Rack

11‧‧‧Base

111‧‧‧Rotation

112‧‧‧ buffer

113‧‧‧ cushion

12‧‧‧ column

121‧‧‧Upright section

122‧‧‧Bend section

13‧‧‧ pulley

13a‧‧‧ pulley

2‧‧‧Rotating unit

21‧‧‧ shaft

22‧‧‧ Turntable

23‧‧‧Collection tray

3‧‧‧Drive unit

31‧‧‧ Passive parts

311‧‧‧First sensing hole

312‧‧‧Second sensing hole

32‧‧‧ drive

324‧‧‧ drive parts

33‧‧‧ brake

331‧‧‧disc

332‧‧‧ calipers

34‧‧‧Flexible rope

35‧‧‧weight parts

4‧‧‧Electronic control unit

41‧‧‧Speed sensor

411‧‧‧Optocoupler

42‧‧‧ Terminal

43‧‧‧ display

44‧‧‧limit switch

Claims (5)

A human body moment of inertia measuring device comprises: a frame comprising a base, a column, and a plurality of pulleys, the column having an upright section extending from the base and extending from the upright section away from the base The bending section is disposed on the upright section and the bending section respectively; a rotating unit includes a rotating shaft rotatably disposed on the base of the frame, and is fixed to the rotating shaft for driving a rotating wheel of the trainer, and a collecting plate disposed under the rotating plate and fixed to the rotating shaft; a driving unit comprising a passive member connected to the rotating shaft of the rotating unit, and driving the passive member to be detachably driven a driving device, a brake disposed on the base for keeping the rotating shaft stationary, a flexible cord received on the collecting reel and connected to the collecting reel at one end, and a other end of the flexible cord a weight member coupled to and convertable between a ready state and an accelerated state, the flexible rope being the pulleys passing through the frame, the weight member being statically suspended from the column in the preparatory state, The When the weight is in the acceleration state, it moves to the ground, and simultaneously pulls the flexible rope to drive the turntable to rotate; and an electronic control unit includes a speed sensor for measuring the rotational speed of the rotating unit of the rotating unit, and a speed The sensor is electrically connected to the terminal that calculates the moment of inertia. The human body moment of inertia measuring device according to claim 1, wherein the passive member is a gear and has a circumferential interval The first sensing hole and the second sensing hole have a photocoupler disposed on the base of the frame and corresponding to the sensing holes. The human body moment of inertia measuring device according to the second aspect of the invention, wherein the brake is a one-disc brake device, and includes a disk disposed on the rotating shaft, and is detachably coupled to the base The caliper of the disc. The human body moment of inertia measuring device according to claim 3, wherein the driving device has a housing disposed on the base and having an armature shaft, a motor, a housing connected to the motor, and a housing Adjustingly sleeved on the armature shaft and extending through the sleeve of the housing, a driving member detachably engaged with the passive member and connected to one end of the sleeve and extending out of the housing a journal disposed on the sleeve of the sleeve, a spring disposed on the sleeve and abutting the journal and the housing, an electromagnetic coil disposed on the housing, and a core disposed on the electromagnetic coil And a shifting lever pivotally connected to the iron core for plucking the journal, the armature shaft having a plurality of teeth formed on an outer surface, the sleeve having a plurality of shapes formed on an inner surface and The tooth groove that engages the tooth portion, the shift lever has a pivotal point pivotally connected to the motor. The human body moment of inertia measuring device according to the first or fourth aspect of the invention, wherein the column of the frame further has a cantilever segment bent from the upright segment to the rotating shaft of the rotating unit, The rotating unit further includes a supporting base extending through the rotating plate and rotatably connected to the cantilever segment, the supporting seat is disposed on the rotating shaft and is supported The trainer is lying on his back.