Mysterious sounds often occur from crescent-shaped sand dunes. They say they often emit mysterious sounds, ranging from soft hissing, melodious kite flutes, to roars, or terrifying explosions, that can be heard from miles away. As real as
how? Strange sound from sand dunes The first mysterious stories of strange phenomena in the desert are said to have come from the legendary explorer Marco Polo in the 12th century. He described these anomalous sounds as “sounds emanating from various types of music. instruments, drums, and the clash of arms”, and claimed that they were the “works” of evil spirits lurking in the desert. Up to the 19th century, these monstrous sounds still toyed with adventurers in the wilderness, even mentioned by Charles Darwin in his travel diary, but he could not explain this strange phenomenon. A remarkable documentary on strange sounds was produced by the British diplomat and explorer, Bertram Sidney Thomas. In 1930-1931, he became the first Westerner to cross the Rub ‘al Khali, or “Empty Quarter”, a vast expanse of desolate expanse of the Arabian desert. During this expedition, he noted the “loud sound of a musical note” emanating from a gentle sand slope. On another occasion, he even heard musical notes emanating from under his camel’s feet. The adventurer was also awakened by high-pitched sounds while sleeping in the tent. When he asked his local guide about the origin of these sounds, he was told that they came from spirits conversing with each other in another world. An explorer named John Philby who was also in the “Empty Quarter” at the same time as Thomas said of what he heard: “Suddenly in the large area began to emit sounds like a siren. or the sound of an aircraft engine, it sounds quite fun, rhythmic and has amazing depth. This “sand concert” lasted about four minutes, which was enough for me to record every detail after I recovered. Such strange sounds, commonly known as “singing sands” or “songs of the dunes”, have been reported for centuries, from places as far away as North and South America, Africa, and Europe. Asia, British Isles, Arabian Peninsula, Hawaiian Islands. The cultures in these regions all have their own legends and myths surrounding this phenomenon. For the Arabs, they were created by desert spirits called Jinn. Many other places for these strange sounds come from lost cities underground, or from ghosts, gods, demons, mythical animals, even demons. The cause has not been determined Explorers sometimes heard musical notes emanating from beneath the camel’s feet. Explorer Philby was one of the first to explain this phenomenon scientifically. He realized that the sounds he heard seemed to coincide with a rain of sand falling from where one of his guides was sitting. He then heard the sand make various noises, such as barks, groans, booming music, or the sound of a trombone or organ, when they were disturbed with different objects. . He thinks that sand itself has certain properties that help them make these sounds when subjected to friction. However, he was not sure about the exact mechanism of this phenomenon. The phenomenon of “singing sand” has many different forms. In the dunes, they often emit sounds such as rumbling, groaning, humming or explosion, thunder, low-flying planes, which can last 15 minutes and reach up to 105 decibels, often heard at a distance. The mysterious sound occurs almost exclusively from crescent-shaped sand dunes, known as barchan, accompanied by wind blowing, or someone walking along a mountain top. “Singing sand” can also be heard at some beaches in the form of hissing, singing, whistling or screaming. In both the dunes and on the beaches, the variety of sounds is very different, the frequency range in which they are emitted is also different. So far, no one has determined what causes these strange sounds, nor why they emit so many different forms with different intensities. It has been suggested that it is due to the friction between the large number of sand grains. The size, texture and uniformity of the particles determine the sound pattern and volume produced. One theory is that it is the result of sound waves bouncing back and forth between the surface of the dune and the surface of the wet layer. According to some scientists, the sound comes from the compression of air between sand grains, or from sand sliding, the movement of one layer of sand relative to another. However, there is no convincing hypothesis. It is worth noting that this phenomenon is quite rare in nature, with only 35 known locations of singing sands around the world. The “Song of the Sand Dunes” has been part of the myths and legends of many different cultures for thousands of years, but so far, despite great advances in science, natural phenomena This is still a mystery waiting to be solved.

An upcoming luxury apartment building in Brooklyn (New York, USA) is driving residents here crazy because it emits noises like whistling but very shrill, disturbing the area quite quiet. this static. Many people compared that bizarre sound to the sound of iron nails scratching wooden boards, which several buildings also heard. This expensive apartment building let out shrill shrieks. Photo: ABC. “It is like a whistle but very high, into a very scary hiss” – said a resident. Some others said, as if there was a dinosaur standing on top of a building howling. Therefore, people call this apartment building the “shouting building”. Residents said this horrible sound has only been released for about 3 months now, when it was loud and small, maybe due to the wind speed, but it was especially annoying for some sensitive people or those who were learning and work from home and need to focus. Therefore, the residents here asked the building and development company to find out what was going on. Many people in the area have lost sleep because of the strange sounds coming from the building. Photo: Lendi. The company said they would monitor the issue, but the people around here were impatient because the hissing from the building lasted for months kept them in a stressful mood, some people were worried and lost sleep. Some engineers said that this is not a mystery, but it may be due to the balcony. Accordingly, the wind blowing through the vertical bars in the balcony caused a hissing sound. Some engineers believe that the vertical bars in the balcony are to blame. Photo: ABC. But whatever the reason, the people here just hope the company has a solution quickly, but no one can live every day in such horror sounds. Thuc Han According to many sources

Slow throttle response is the most common sign on turbocharged engines. This is caused by a suspended exhaust, i.e. always open or a vehicle with a fuel delivery problem.

When the turbo doesn’t accelerate as quickly as before then the first issue to consider is the turbocharger. Likewise, when the turbo has trouble maintaining its speed or is unable to reach a certain speed threshold, it is possible that the turbocharger is faulty.

Slow throttle response is the most common sign on turbocharged engines

1. Increase fuel consumption

Another benefit of using turbochargers is increased fuel economy, so if you notice a significant increase in your vehicle’s fuel consumption, you have to bring your garage to the test. This symptom can be caused by a variety of problems including a leak in the turbo causing raw fuel to flow into the exhaust.

1. Excessive exhaust fumes

A turbocharger reduces emissions which means it also significantly reduces the amount of exhaust fumes emitted from the exhaust on both petrol and diesel engines.

When the amount of smoke is generated too much even when the engine has warmed up, it could be a sign of a broken turbo, namely a crack in the case or worn seals.

This causes fuel to leak into the exhaust system, significantly increasing the amount of smoke released from the vehicle’s exhaust (or exhaust). Blue smoke may indicate a worn or worn valve seal or piston ring.

When the smoke is generated too much even when the engine has warmed up, it could be a sign of a broken turbo

1. Loud shout

The turbocharged engine actually works quieter because it reduces the sound of the intake air. However, if you hear a loud screech coming from the engine compartment, it is a sign that the turbocharged engine is not working properly.

Generally the louder the noise, the greater the damage, the problems that cause this noise such as: damage to the fan blade, vacuum leak, damage to the divider valve or poor ECU Remap.

1. Check the engine lights

On most modern cars, the computer system will detect turbo damage. According to maintenance care experience, this is the first sign that a car’s turbocharger is having problems.