JPS6153067B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanical impedance detection device for a human body in a pine surge machine that determines the pine surge effect based on a pattern of mechanical impedance characteristics.

Conventionally, the mechanical impedance of the human body in a pine surge machine has been detected by varying the frequency. That is, as shown in FIG. 1, an acceleration sensor 3 and a force sensor 4 are provided on a sensor block 2 that is placed in close contact with a human body 1 and coupled to an exciter 5, and the sine wave output of a frequency oscillator 6 is transmitted through an amplifier 7. The amplitude is increased and the vibrator 5 is made to vibrate.
The acceleration sensor 3 detects the acceleration A of the sensor block 2, and the force sensor 4 detects the acceleration A of the sensor block 2.
Detect the force F〓 applied to Acceleration A〓 and force F〓 are amplified by sensor amplifiers 8 and 9, and acceleration A〓 is amplified by an integrator 10.
Convert to velocity V〓. The mechanical impedance Z is
Since it is calculated by Z = F / V, the divider 11 calculates Z
Calculate. Z〓 is converted into a digital quantity by the A/D converter 12 and stored in the memory 13 as Z〓 for the angular frequency ω,
In other words, it is stored as Z〓(ω). Here, to capture the pattern of mechanical impedance characteristics,
The angular frequency ω is not single but requires a plurality of angular frequencies, and it has the drawback that it takes time to set the angular frequency ω and read Z〓(ω).

The present invention has been made in view of the above, and its purpose is to add a rectangular wave impulse with almost zero time to the excitation input waveform, and to perform one machine operation using only the time to sample the response and the calculation time. The objective is to obtain impedance, enable detection in a short period of time, and further realize arithmetic processing using software to simplify and miniaturize the hardware configuration.
The present invention will be explained in detail below with reference to Examples.

In FIG. 2, reference numeral 1 indicates a human body, and a sensor block 2 that is brought into close contact with the human body is provided with an acceleration sensor 3 and a force sensor 4, and is coupled to a vibrator 5. The acceleration detected by the acceleration sensor 3 and the force detected by the force sensor 4 are amplified by sensor amplifiers 8 and 9. 14,1
5 is an A/D converter that digitally converts the sensor output. A first memory 16 stores digital quantities converted by the A/D converters 14 and 15. This once stored digital quantity is subjected to Fourier transformation, multiplication and division by the arithmetic processor 17. 18
is a second memory that stores the calculation result Z〓(ω) of the calculation processor 17. If the data stored in the first memory 16 is F(t), A(t), the arithmetic processor 17 calculates the mechanical impedance j
Calculate ω〓(ω)/〓(ω). A rectangular wave impulse generator 19 generates a rectangular impulse pulse with a time Δ≈0 and an amplitude 1/Δ, whose output is amplified by an amplifier 7 and applied to the vibrator 5.

FIGS. 3 a to 3 f are signal waveform diagrams of the main parts of the present invention. When a rectangular wave impulse as shown in FIG. Impulse response F(t),A
(t) are shown in FIG. 3b and c, respectively. F(t),
F〓(ω),A〓 found by Fourier transform of A(t)
(ω) becomes as shown in Fig. 3 d and e. This F
(ω), A〓(ω) to mechanical impedance Z〓(ω)
is found as 〓(ω)=jω〓(ω)/〓(ω).

As described above, the present invention includes a sensor block that is in close contact with the human body and has an acceleration sensor and a force sensor and is coupled to an exciter, an A/D converter that digitally converts the sensor output, and a digital converter for the A/D converter. a first memory for storing quantities, an arithmetic processor for performing Fourier transform, multiplication and division on the digital quantities stored in the first memory, and a second memory for storing the arithmetic results of the arithmetic processor;
The rectangular wave impulse generator is equipped with a rectangular wave impulse generator, and the rectangular wave impulse generated by the rectangular wave impulse generator is applied to the exciter, and the impulse response detected by each sensor is Fourier transformed by the arithmetic processor, and both Fourier transforms are performed. The mechanical impedance of the human body is detected by calculating the ratio of values.

[Brief explanation of the drawing]

Figure 1 is a block circuit diagram of a human body mechanical impedance detection device in a conventional massager.
Figure 2 is a block circuit diagram of one embodiment of the present invention;
Figures a to f are signal waveform diagrams same as above. 1... Human body, 2... Sensor block, 3... Acceleration sensor, 4... Force sensor, 5... Exciter, 1
4... A/D converter, 15... A/D converter, 16... First memory, 17... Arithmetic processor, 18... Second memory, 19... Rectangular wave impulse generator.

Claims (1)

[Claims] 1 A sensor block that is in close contact with the human body and has an acceleration sensor and a force sensor and is coupled to an exciter, an A/D converter that converts the sensor output into digital data, and a first sensor block that stores the digital amount of the A/D converter. a memory, an arithmetic processor that Fourier transforms, multiplies and divides the digital quantity stored in the first memory, a second memory that stores the arithmetic results of the arithmetic processor, and a rectangular wave impulse generator. A rectangular wave impulse generated by a wave impulse generator is applied to an exciter, the impulse response detected by each sensor is Fourier transformed by a processor, and the ratio of the two Fourier transformed values is calculated. A mechanical impedance detection device for a human body, characterized in that the mechanical impedance of the human body is detected.