What is the resonance frequency of the human body? What is the resonance frequency

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1) The natural frequencies of the internal organs of the human body.

4 12hz, 1986, French infrasound.

The main reason for the sudden death of more than 30 farmers in the field is the leak of infrasound in the laboratory:

a. The speed of infrasound propagation is fast;

b. The infrasound frequency is the same as the natural frequency of the internal organs of the human body, and the organs are damaged due to resonance and die;

c. People can't feel infrasound, and infrasound can kill people unconsciously;

d. Infrasonic waves have strong penetrating ability and cause damage when passing through the human body.

2) Two wave sources with the same frequency, in the process of vibration, their direction of movement is always opposite, when the wave excited by these two wave sources is transmitted to a certain point P, the phenomenon of vibration always cancels out at point P, then the difference between the distance between point P and the two wave sources should be: [

a, may be equal to one wavelength;

b. May be equal to half a wavelength;

c. may be equal to an even multiple of half a wavelength;

d, equal to any value.

3) The following is about the Doppler effect.

The correct statement is: [.]

a. When the Doppler effect occurs, the frequency of the wave source changes;

b. When the Doppler effect occurs, the observer.

The frequency of acceptance has changed;

c. The whistle of the car coming towards you is particularly harsh, which is the Doppler effect.

d. Not only mechanical waves.

The Doppler effect, which is also present in other waves.

The speed of mechanical wave propagation is related to the medium, and the speed of ultrasonic waves and infrasound waves in the air is about 340m s.

2) AC analysis: It should be noted that the vibrations of the two coherent wave sources are completely opposite, so when the distance difference meets the even multiples of half the wavelength, the vibration at that point is weakened.

3) BCD analysis: When the Doppler effect occurs, it is not the frequency of the wave source that changes, but the received frequency.

The Doppler effect is a property of waves, and in addition to mechanical waves, other waves also have the Doppler effect.

Generally speaking, the resonance frequency of the human body is similar to the heartbeat (pulse) of the human body. If the frequency of the vibration is close to the person's heartbeat, the person will feel very uncomfortable.

It refers to the situation in which a physical system vibrates at a greater amplitude than other frequencies and wavelengths at a specific frequency and wavelength; These specific frequencies and wavelengths are called resonant frequencies and resonant wavelengths.

At resonant frequencies and wavelengths, small periodic vibrations can produce large vibrations because the system stores kinetic energy. When the drag force is small, the resonant frequency and resonance wavelength are approximately equal to the natural frequency and natural wavelength of the system (also known as natural frequency and natural wavelength), which are the frequencies and wavelengths at which they oscillate freely.

All vibrations must be manifested in the form of displacement, and behind them must be the flow of energy. The fundamental reason why resonance is so powerful is that resonance causes external forces to act directly at the molecular or atomic level (or some other specific level), and continuously absorb energy, causing it to undergo a small range of violent displacements.

If the external frequency is inconsistent with the natural frequency, then the object of the external force is the whole object, but if it is consistent with the natural frequency, then the object of action directly becomes a molecule and atom, and the resonance destroys the unity between the particles, making them fight with each other, and the result is that the whole system collapses instantly.

The vibration frequency of the sound that can be felt by the normal human ear is between 20Hz and 20000Hz, but in reality it is not necessarily audible even in this frequency range.

On the other hand, the human ear has limited resolution and sensitivity to sound intensity, so the sound intensity of vibration also varies from person to person.

There are three common conditions that cause changes in the intensity and frequency of sound.

1. In the process of sound wave propagation, its energy will be continuously absorbed and converted into other forms of energy, and its sound intensity and frequency will change.

2. Diffusion will also cause the energy flow density of the sound wave to decrease with the change of propagation distance, causing changes in sound intensity and frequency.

3. Interference between different sound waves.

The vibration frequency f is the number of vibration cycles of an object per second, and the SI unit is hertz [Hz]. Frequency is a sign of vibration characteristics and an important basis for analyzing the causes of vibration.

According to the law of vibration, mechanical vibration is generally divided into two types: deterministic and random. The first classification is mainly based on the characteristics of vibrations over time. The types of vibration in most mechanical equipment are periodic, quasi-periodic, narrow-band and broadband random, as well as a combination of certain types of vibration.

Generally, the vibration signal in the process of starting or stopping is non-stationary. In the actual operation of the equipment, the periodic signal of its performance is often drowned in the random vibration signal. If the degree of equipment failure is aggravated, the periodic component of the random vibration will be strengthened, and the vibration of the whole equipment will increase.

Therefore, in a sense, the process of diagnosing the vibration of equipment is the process of extracting periodic components from random signals.

The root cause of the vibration of the machine lies in the excitation of one or several forces. Different types of vibrations are provoked by forces of different natures. According to this, mechanical vibrations can be classified into three types:

1) Free vibration.

After giving a certain amount of energy to the system, the vibration generated by the system. If the system is not damped, the system maintains equal amplitude vibration; If the system is damped, the system is attenuated vibration.

2) Forced vibration.

The vibration of an element or system is caused by the action of an external force that changes periodically, such as imbalance and misalignment.

3) Self-excited vibration.

In the absence of external force, it is only caused by the excitation generated by the system itself, such as oil film oscillation, surge, etc.

The vibration caused by mechanical failure is mostly forced vibration and self-excited vibration.

The resonance frequency of the human body refers to the natural frequency of the human body, because the human body is not the same, the natural frequency of the human body will be very different, and the most harmful to the human body should be the beating frequency of the human heart, if it is in the resonance form, it will cause indirect damage to the heart until death.

Generally speaking, a system (whether mechanical, thermal, or electronic) has multiple resonant frequencies at which it is easier to vibrate and more difficult to vibrate at other frequencies. If the frequency that causes the vibration is complex (e.g. an shock or a wideband vibration), a system will generally "pick out" its resonant frequency to vibrate with that frequency, and in fact a system will filter out other frequencies.

We all know that the universe came into being after a violent big **. And one of the fundamental reasons for the emergence of this big ** is resonance. When the universe is still at a chaotic singularity, oscillations begin to occur inside.

Initially, the oscillations were very weak. Gradually, the frequency of the oscillations became higher and stronger, causing resonance.

Finally, under the combined effect of resonance and expansion, it led to an earth-shattering and dramatic change, the universe expanded and expanded sharply in an instant, and then the sun, moon and stars were produced.

Resonance not only creates the macrocosmic universe, but also the creation of the microcosmic material world is also inextricably related to resonance. From the perspective of the electromagnetic spectrum, the energy of the movement of atomic nuclei, electrons, photons and other substances in the microscopic world is transmitted in the form of waves. The chemical elements in the early days of the universe can also be said to have been synthesized and produced through resonance.

There are particles that are unimaginably small, but they can combine with each other in an instant of 100 trillionths of a second under the action of resonance, and new chemical elements are created. Because the generation of these particles in the universe is so closely related to resonance, particle physicists often refer to particles as "resonant bodies".

The human vibration wave is 4 12 Hz.

Human Vibration Waves:

The so-called resonance frequency of the human body refers to the natural frequency of the human body, due to the different height, shortness, fat and thin of the human body, the natural frequency of the human body will be very different, the most harmful to the human body should be the beating frequency of the artificial heart, if it is in a resonant state, it will cause damage to the heart until death. The resonance frequency of the human body is about the same. Each part of the body has its own co-ruler frequency, such as the resonance frequency of the internal organs is 4-6, the resonance frequency of the head part is 8-12, etc.

Einstein's mass-energy equation explains:

Matter is energy. Physicists have proven that all solids in our world are made up of rotating particles. These particles have different vibrational frequencies, and the vibrations of the particles make our world appear the way it is.

The same is true of our human body. Scientists have measured the vibrational frequencies of people's bodies in different physical and mental states, and the results are eye-opening. <>