Why is the noise suddenly loud when the plane lands

There are several reasons why the noise suddenly becomes loud when the plane lands:

1.When the plane is about to land, it needs to land at a fast speed, so the engine power is relatively high, and the brake pads will also produce friction and produce a lot of noise.

2.When the aircraft lands, the engine thrust reverser will produce a huge reverse thrust, which will cause the aircraft to slow down rapidly, and at this time, it will also produce a huge noise.

3.After the plane lands, the spoiler opens, and the airflow creates vibrations, which also produces a lot of noise.

These are some of the reasons why the plane suddenly becomes loud when it lands, and we hope it can help you.

This is mainly related to the engine thrust reverser when the aircraft lands, when the engine thrust back, the airflow pushes out in reverse, generating backward braking force, and a large number of disturbed airflow vibrations produce a loud sound. When taxiing in front of the runway, the engine is generally in a slow state, and the noise is small, and after the aircraft bottoms out, the engine will run at a certain power, producing more noise than the former. At the same time, when the spoiler is opened, there will also be a situation where the air flow vibrates and makes sound.

Hello, this is a means of deceleration after the aircraft is grounded: engine thrust reverser, that is, the use of a diversion device to make the engine spray air flow diagonally forward to achieve the purpose of deceleration. Because the thrust reverser is turned on to increase the thrust force, there will be a loud sound.

The sound is essentially the same as the sound of takeoff.

The first task of large aircraft noise research is to understand its main noise sources.

The main noise sources of large civil aircraft can be divided into:

1) Powertrain noise, i.e. noise generated by engine components (fans, compressors, turbines, combustion chambers, nozzles, etc.);

2) Non-powered (fuselage) noise, including turbulent boundary layer, landing gear, landing gear door and cover circulation, aileron and movable auxiliary wing circulation, resistance plate circulation, wing and fuselage circulation, engine installation and fuselage interference, etc.

When an airplane takes off, it needs to accelerate from a standstill with all its might, so the engines of the airplane will run at maximum power, and naturally it will make a loud sound.

When the aircraft lands, it is a deceleration movement, and the engine does not need to output power, and the engine only runs at idle speed. So the sound of the launch is very small.

The sound of the aircraft mainly comes from the engine, the rest is wind noise, and the take-off and landing wind noise is very small.

When the plane takes off, the engine needs to increase the horsepower to take off, so it makes a lot of noise. Landing is the process of the aircraft slowing down to the runway and taxiing, and of course the sound will be relatively quiet.

The high-speed operation of the propeller of the aircraft during take-off produces a lot of noise, and the noise is low when it lands.

1.The noise of the aircraft is mainly generated by the engine, and the supersonic aircraft also have shock waves.

2.The piston engine of an airplane is generally more powerful than that of a car, and there is no special silencing equipment so it is noisy.

3.The acceleration of the gas turbine engine to the air is particularly large, so it is very noisy.

4.Airplanes are turbine engines, which forcibly compress the air and spray it out, the air vibrates, and the friction of gas molecules is of course noisy, which is the same as firecrackers.

5.When the plane starts, just like when the car starts, the engine is very loud when it starts, and when it starts, the engine is stationary and becomes motion, and the work done at this time is the largest, so the noise generated is also very large.

Effects of Aircraft Noise on the Human Body: Aircraft noise pollution can not only affect people's hearing, but also cause high blood pressure, heart disease, memory loss, attention deficit syndrome, concentration and other neurological syndromes, especially for children. Noise is the enemy that affects children's mental and physical development.

According to research data, children living in aircraft noise environments have 20% lower mental development than in quiet environments; Nutritionists have found that aircraft noise will not only reduce the body's immune function, but also increase the consumption of nutrients such as vitamin C, B1, B2, B6, amino acids, glutamic acid, and lysine in the human body, which will have a bad impact on children's growth and development.

1.The most important thing is the sound of the engine! Turbojet engines make loud noises when they are running.

2.As the landlord said, the airplane and the air are also somewhat noisy 3If it's a military fighter, there will be a sonic boom.

Generally, civil aircraft do not fly at supersonic speeds, except for Concorde

Military aircraft are loud, because civil aircraft are mainly concerned with the comfort of passengers, so they pay attention to sound insulation and make less noise. And the first consideration of military aircraft is its combat performance, and it is not very important in terms of sound insulation. As you can see from the movie, the paratroopers in the transport plane need to shout loudly to get to the point.

The thrust of an aircraft engine is huge, and the noise will be loud.

In addition, the louder the engine of the aircraft, the louder it becomes. For example, the sound of a large civil aircraft will be louder than that of an ordinary small aircraft.

Fixed-wing aircraft refers to an aircraft with wings, one or more engines, propelled by its own power, and capable of being denser than air in space or the atmosphere. If the density of the aircraft is less than air, then it is a balloon or an airship. If there is no power unit and can only glide in the air, it is called a glider.

If the wing of the aircraft is not fixed, it is a rotorcraft that generates lift by wing rotation. Fixed-wing aircraft are the most common aircraft type. Power** includes piston engines, turboprops, turbofan engines or rocket engines, among others.

I used to be in the Air Force, the voice when flying? Which should be the sound of the turbine maneuvering, and the loud sound when the fighter plane breaks through the sound barrier, which is the sound barrier problem.

Supersonic flight has sound impairment and will produce a sonic boom, so it is deafening and deafening Vulgar flight is not allowed to cruise at supersonic speed if there are civilian facilities below.

It is the sound of the propeller, and the aircraft propeller needs to rotate at high speed to produce a difference in airflow, so that the airflow will lift the aircraft upward, so the noise is relatively loud, especially if you sit in the middle of the aircraft.

Engine noise, dry air, and cabin noise, like a lot of barabalas.

On March 2, 1969, the "Concorde" supersonic passenger aircraft jointly developed by Britain and France began to fly test, which was the world's first supersonic passenger aircraft. It was discovered that supersonic aircraft produce a thunderous sound when flying, what is going on?

When the boat travels in the water, it stirs up waves that gradually spread outward. During the flight, the aircraft will also disturb the surrounding air, so that the pressure and density of the air will change accordingly, and continue to spread outward. In the process of disturbance propagation, there is a sub-interface between the disturbed air and the undisturbed air, which we call the perturbation wave.

Because the speed of the aircraft can be fast or slow, the disturbance air is strong and weak, and the disturbance wave is also strong and weak. If there is a significant difference in the pressure before and after the wave, it is called a strong disturbance wave, also called a shock wave. The difference between the pressure before and after the wave is very small, which is called a weak disturbance wave.

The sound of airplane flight that we usually hear is produced by weak disturbance waves, which is also what we usually call sound waves.

The propagation speed of a weak disturbance wave is the speed of sound, and the propagation speed of a strong disturbance wave is the supersonic speed. The weak disturbance wave generated by the flight speed of the aircraft at a speed lower than the speed of sound propagates in the air current, spreading in all directions like a stone thrown into water, and the pressure difference between the air in front and behind the aircraft is small. When the aircraft flies at supersonic speed, the nose, wings, wings, tail, etc. will cause a sharp pressure change in the surrounding air, resulting in strong front shock waves and rear shock waves.

As the shock wave passes, the air pressure rises suddenly, and then the pressure drops steadily to below the surrounding atmospheric pressure. Then, as the aftershock wave passes, the pressure rises abruptly again, gradually returning to the surrounding atmospheric pressure. The interval between the two shock waves passing through before and after is about seconds.

If the flight altitude of the aircraft is not too high, we can hear the thunder like a thunderbolt on a sunny day or the sound like a cannonball** at the moment when the shock wave passes, which is the so-called "sonic boom" in the flight of a supersonic aircraft. Since there are two shock waves in front and back, we are able to hear two short sonic booms.

The sonic boom is related to the altitude and speed of the flight. At the same flight speed, the flight altitude is low, the ground shock wave is strong, and vice versa. Similarly, at equal altitudes, the greater the flight speed, the stronger the shock wave, and vice versa.

If you fly at low altitude at supersonic speed, the resulting sonic boom can even collapse a building. Therefore, in order to protect the interests of the people, under normal circumstances, the aircraft should fly at a supersonic speed not lower than the specified altitude, so as to weaken the impact of the sonic boom on the ground.

Because the plane needs to break through the sound barrier when the speed is too fast, the moment the sound barrier is breached, it will produce a loud noise, which is caused by violent vibration at the peak of the sound wave.

It is because the plane will rub against the air when flying, resulting in some very loud sounds, which is also a situation that we cannot avoid.

Inside airliners, close to the engines (usually near the rear of the wings), the noise is very high. It should be a large aircraft with more engine power and a higher number of engines, the more noisy.

The sound of planes taking off and landing is deafening and unbearable for those who live near the airport. Recently, the United States and the United Kingdom have cooperated to develop a "silent aircraft", which solves the problem of aircraft noise, let's take a look.

"The most important modification of the silent aircraft is the redesigned engine. Compared to existing aircraft, its engines are twice as large, allowing the aircraft to take off at lower speeds. At the same time, in order to make the noise upward, the engine is mounted on the roof of the aircraft.

In addition, its wings are very sleek, allowing the aircraft to glide gently through the atmosphere, which reduces noise to a minimum and is completely tolerable.

Zoulte 6 1 Sparkowski, Massachusetts Institute of Technology, USA: "Imagine the sound of people making a noise in a meeting. The sound of this kind of plane taking off and landing is just that loud. ”

This aircraft has a streamlined exterior and a spacious interior that can accommodate up to 215 passengers. It will also be about 25% more fuel efficient than current airliners.

The noise of the engine is very loud. It should be a large aircraft with more engine power and more engines, and the louder it is, such as the B52 with 8 engines should be the noisiest.

If it wants to fly so high, of course, it needs a large power plant, and the power is naturally noisy, hehe!! I don't know if you're satisfied.

Airliner engines are not piston and do not reverse.

The sliding door opens, and the principle of air movement is used to direct the air to the other side.

In this way, the forward momentum is reduced and the aircraft slows down.

Airplanes nowadays are generally jets:

Aircraft engines shoot back up to thousands of kilometers of flame per second, resulting in the reverse lift of the air;

But this also inevitably caused the air to vibrate louder, making louder noises.

When the plane lands, due to the influence of gravity, it can be operated immediately, so the plane just reduces its power and continues to move forward at a low speed. Since the minimum power of the jet aircraft is greater than 250 meters, (250 meters is the minimum take-off momentum coefficient of the aircraft), people have designed a method to disperse the energy of the tail of the engine, one; acceleration and deceleration of the mountain, II; The top air resistance plate is equipped with a tomato resistance.

Three. Set up wake diffuser. Hinder or alter the energy of the wake behind the aircraft.

You're talking about the third case: because although the output of the engine is reduced, the disperser of any material is much more powerful than the air, so it often causes the body to shake greatly and make a louder sound.

Upstairs is not right, any of you have ever heard of a jet that breathes fire forward. But theoretically it is not possible, the jet engine and the car, the train starts on a very different principle, the speed of up to thousands of revolutions per second, if he wants to reverse in an instant, the strong centrifugal force will throw the plane to pieces. Airplanes, on the other hand, need to have constant power