it's about soundproof room
it's about soundproof room When walking in a crowd, what sound do we usually hear? Car horns, motorbikes and people screaming in the streets. We know, the sound is produced because sound waves propagate in one medium, one of which is air. In addition to air, the vibrations that produce sound can also propagate through solids and liquids. For example, toy telephones used thread when we were small. We can hear our friend's whisper on the other end of the line, right? But have you ever imagined if the propagation of these sounds could be stopped so that noise pollution was reduced?
Research from experts at the School of Mechanical and Aerospace Engineering, Ohio State University has the answer. Sih-Ling Yeh designed a device to absorb sound vibrations so that it can help improve the soundproofing level. This homemade tool can control vibration in any condition. For example, his homemade resonator can be used to reduce the loudness of a car exhaust. In fact, bridges and public facilities traversed by thousands of vehicles can be limited by the effects of noise and vibration. The working principle of this tool is to use a spring-like oscillator to control the vibration level. Some of them are absorbed and neutralized, but some are amplified and then directed towards a certain place. Similar to the chamber on a guitar, when the strings are plucked, the sound waves are directed towards the holes to make the sound stronger. The space also functions as a resonator.
How to test the effectiveness of the tool? Let's look carefully!
The researcher placed several plates, some of which could be clamped, hung, or held with certain tools. Then, the plates are struck with a hammer and the vibrational force produced by each plate is measured. The position of the plates must be fixed and cannot
shifted because the slightest shift will affect the calculation results. As a result, the use of a resonator on the plate causes the plate to flex and absorb the vibrations of the hammer well.
This experiment is made as a test tool for a particular design that will be applied in real life. For example, such as building an aircraft frame structure that can automatically reduce the sound heard into the cabin.
Try to imagine a sandwich. There was bread, meat, cheese, mayonnaise and an omelet. Uenaakk. This is just an example you know!
The layers in the sandwich are analogous to a lightweight panel with a built-in resonator between the two panels. One of them is GRC (Glass Reinforced Concrete), a mixture of concrete and glass fiber. Alternatively, the resonator is inserted into the plane's wall. This results in reduced vibration of the entire system without compromising the aerodynamics or efficiency of the aircraft. The reason is because the mass of the resonator is very low close to zero so it does not affect the addition of force and the high pressure point of the fuselage when traveling in the air.
The resonator also controls the vibration that causes a sound to be heard. One more thing, the vibrations also affect the direction of air flow in an airplane or four-wheeled vehicle.
How? Interested in constructing a resonator to control the vibrations that cause unwanted sounds? With this tool we can dampen the vibrations caused by the sound of party music that vibrates the windows of the house until before the dawn call to prayer. Oh, it's definitely annoying when you're doing schoolwork, especially when you have an exam the next day. Your life is over.