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    Jiadong Acoustics Knowledge Popularization-Jiadong Acoustics Principle Soundproofing Pad Introductio

    release time:2019-04-04

    Source:Shanghai Jiadong Industrial Co., Ltd.

    Views:40

      First, the generation and spread of sound

      Sound generation: The sound is generated by the vibration of the object; all the sounding objects are vibrating, the vibration stops, and the sound stops.

      Shanghai Jiadong shock pad prevents object vibration and solves noise generation from the source.

      The spread of sound: the transmission of sound requires a medium (the substance that propagates sound is called a medium), and the vacuum cannot transmit sound. Solid, liquid, and gas can all transmit sound. The unique technology of Shanghai Jiadong Soundproofing Blocks blocks the way of sound transmission and effectively reduces noise.

      Sound waves: The sound of the sound body changes the density of the air that is transmitted, and produces sound waves. Shanghai Jiadong sound insulation pad sound wave shape interface, effective sound insulation.

      Sound speed: The speed of sound spreads.

      Factors that determine the speed of sound: 1, the type of media. 2. Medium temperature.

      Remember: 15 ° C speed 340m / s.

      Second, how do we hear the sound

      The structure of the human ear: the outer ear, the middle ear, and the inner ear.

      The process of perceiving sound: the vibration of the sound source produces sound → the propagation of medium such as air → the vibration of the tympanic membrane. (The sound from the outside causes the tympanic membrane to vibrate. This vibration is transmitted to the auditory nerve through the small bones and other tissues, and the auditory nerve transmits the signal to the brain, so that the person hears the sound).

      Bone conduction: The sound can also be transmitted to the auditory nerve through the skull and jaw, causing hearing. This transmission of sound is called bone conduction.

      Binaural effect: The distance from the sound source to the two ears is generally different. The moment, strength and other characteristics of the sound transmitted to the two ears are also different. These differences are an important basis for judging the direction of the sound source. This is the binaural effect.

      Third, the characteristics of the sound

      Tone: The level of the sound is related to the speed of the object's vibration. The object vibrates quickly and the tone is high; the vibration is slow and the pitch is low; the frequency determines the pitch.

      Frequency: The speed at which the object vibrates. The number of times the object 1S vibrates is called the frequency.

      Human ear hearing range: 20Hz-20000Hz.

      Ultrasound: Sound above 20,000 Hz. (bats, dolphins can be sent)

      Infrasound wave: sound below 20Hz. (earthquake, tsunami, typhoon, volcanic eruption)

      Loudness: The strength of the sound is called loudness. Loudness is related to amplitude, and the greater the amplitude, the louder the loudness.

      Tone: The characteristics of the sound. The tone is related to the material and structure of the sound body.

      Three instruments: percussion, stringed, and wind instruments.

      The pitch of the instrument (sound body): length (low pitch), thickness (low pitch), and tightness (low pitch) determine the pitch.

      Fourth, the harm and control of noise

      Noise: The sound of an object made by random vibrations (physical point of view). From an environmental point of view, all sounds that impede people's normal rest, study, and work, as well as sounds that interfere with the sounds people want to hear, are noise.

      Level and hazard of noise: Decibel (dB) is the unit of sound strength, 0dB is the weakest sound that the human ear can hear; 30-40dB is an ideal quiet environment. In order to protect the hearing sound, the sound should not exceed 90dB; in order to ensure work and study, the sound should not exceed 70dB; in order to ensure rest and sleep, the sound should not exceed 50dB.

      Control noise: prevent the generation of noise; block the propagation of noise; prevent noise from entering the human ear. That is: 1. Attenuate the noise at the sound source; 2. Attenuate the noise during the propagation; 3. Attenuate the noise at the human ear.

      Fifth, the use of sound

      Sound and information: Sound energy conveys information. (Thunder, B-ultrasound, tapping rails, etc.)

      Echolocation: Acoustic waves are reflected in obstacles, and the position and distance of the target are determined according to the direction and time of arrival of the echo (bat)

      Sonar: Positioned according to echo.

      Sound and energy: Sound energy transfers energy. (Ultrasonic cleaning precision instruments, gravel)

      Shanghai Jiadong Industrial Co., Ltd. is the forerunner of floor noise reduction and noise improvement control. The “Sound Elimination” brand environmental protection soundproofing mat has been tested by nationally certified products, which plays a vital role in improving the performance of the floor and improving the quality of the living. Reducing resonance, improving amplitude, and even opening gymnasiums and sports venues at high floors, KTV can also be done with the downstairs and neighbors.

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