When running at high speed, what kind of car is easy to flutter , and what car is not easy to flut

Why are some cars easy to float at high speeds, while others are very stable? The old driver says the answer!

In high-speed driving, why do some cars float when they drive fast? The reason is simple! People who often run at high speed will know that when the speed is fast, or when you are speeding, you will feel that the car is very unstable, fluttering and shaking, and the steering wheel becomes difficult to control, but some cars will be particularly stable, which has very little to do with the expensive and cheap carMany people don't understand what the reason is, and some people will be because of the problem of cheap cars, but this is not, let's take a look!

Some friends will think that the car is fluttering because it is fast and light, especially in some Japanese cars that pursue lightweight, in fact, this is not a matter of the weight of the car, the German car is heavy, but some German cars are also like this, now we will talk about the reason, of course, it is just a personal point of view, for reference only, there is an iron law, that is, the shorter the chassis of the car, the faster it will float, the more stable the car with a high chassis, this is the reason why some people say that the 408 chassis, the 408 chassis is the highest, Maybe 99% of people think that I said the opposite, but I really am not wrong, because people who really understand cars will know whether what I said is right or not, and you can understand it when you figure it out, and some cars do not want to be short, but they are forced to be reluctant to be short, about the design of the car.

This floating feeling is related to several factors, the weight of the car, in the same series of cars will not be very different, some cars are steering wheel power mode, now many cars are electronically assisted, the steering wheel is very flexible when the speed is low, and the higher the speed is very stiff, the direction will reduce the excessive direction or too fast direction to cause the vehicle attitude to be unstable. The width and size of the tire, the larger the contact surface, the greater the friction, and of course, it is also proportional to the weight of the vehicle. In the suspension mode, some suspensions have poor performance, but they are very stable on flat roads at high speeds.

The aerodynamic design of the car, however, does not have much impact on the 120 mph speed. The aerodynamic smoothness of a car at high speeds is very important for the stability of the car, which is why supercars have a cool look. Whether the driver is experienced or not, and the direction of braking acceleration are very particular.

The old driver will follow the movement of the car to make subtle and appropriate adjustments, and the novice's rapid acceleration and deceleration, and too fast direction will make the body posture unstable. The configuration of the vehicle, many cars will have an attitude stabilization system, except for the front-wheel drive car will have understeer, the rear-wheel drive car will have oversteer, four-wheel drive is the best choice, but the fuel consumption is large, the price is high, and the low-end car generally does not have a four-wheel drive version.

In fact, the weight of the car is not very related to the weight of the car, mainly or the chassis, in this regard, the chassis of the Volkswagen is better, those who have driven Volkswagen say that they feel very stable at high speed, take the Jetta as an example, the car is not heavy in the same price range, but compared with other cars, it is very stable to run at high speed, so do you understand?

Here's why:

The grip of the tires is weakened. Tires have a great impact on the driving stability of a car, including tire pattern, tire size, tire wall stiffness and thickness of the tire position and a series of problems, all because they can affect the process of high-speed driving.

The air generated by the tires and the road surface will have a strong sense of presence, so it can produce the phenomenon of lifting the car and fluttering, so when the tread pattern design of the tire is not enough to cut the airflow, it will not provide a strong grip for the car.

The chassis suspension is too soft. Whether the vehicle is stable and handles well while driving on the highway. The design of the automobile chassis plays a vital role in the stability of the vehicle, in which the suspension components are divided into soft suspension and hard suspension.

Although the hard suspension filter is not particularly good, it can make the vehicle appear more stable, the soft suspension is very sensitive to the weight loss of the vehicle, and will find ways to alleviate the vibration, in the process of highway driving, the strong wind speed will make the soft suspension car spend a lot of energy to restore the stability of the body, so it will produce such a feeling.

Precautions for driving at high speeds.

1. When parking on the highway, the car suddenly pulls over, there are no warning signs after parking, and the passengers are all around the car to watch, which is very dangerous.

Tips: If the car can still drive, make sure that the car behind you has enough safety distance, then turn the turn signal to pull over, stop on the shoulder of the road, turn on the double jump lights, and set up a warning sign (triangular reflective sign, on every car) 150 meters behind the car. All passengers leave the car, stand outside the guardrail on the right, do not stand by the car to watch, let alone sit in the car.

2. Drive at a constant speed.

The highway should be driven at high speed, but if the speed is fast, the novice will be nervous, and the direction will deviate, which is easy to cause accidents. If it is slow, it is easy to cause poor vision and rear-end collision to the rear car that comes up quickly.

Tips: It is recommended that novices get on the highway for the first time, maintain a speed of 90-100 km/h under normal road conditions, and if it can only be less than 80 km/h, it is recommended to take ordinary roads.

The body of the car is a convex structure, the wind speed at the top is too high, the wind speed at the bottom is too low, and the flow speed is lower with atmospheric pressure, resulting in an imbalance of air pressure up and down, and the car will be subjected to an upward thrust or attraction (refer to the airplane);

This is what I personally said: when the car is driving at high speed, the faster the speed, the greater the mass, that is, the forward mass will gradually balance with gravity, the greater the mass, the greater the attraction, no matter how fast you are, you will continue to move around the earth along the traction of the earth, unless your initial speed can reach the speed of breaking away from the earth's gravity, otherwise you can't rely on linear motion to directly levitate.

From the point of view of physics, modern car models are similar to wings, in a streamlined line, at high speed, the flow velocity above the car is large, the pressure is small, and the flow velocity under the car is small, the pressure is small, so it forms an upward lift, as you said a little floating, this is similar to the principle of wing lift-off, no need to make a fuss.

It's because on the highway, the car is driving too fast and the friction is relatively small.

Because the speed of the car on the highway is very fast, there will be a wife who floats up.

On the highways, many cars are very fast. So it feels like it's going to float.

Because the speed of the car is very fast when driving on the highway, it is said that there is such a feeling.

Because when driving on the highway, the car is very fast.

That's because you're lacking less quality, but you're very fast.

This is because the speed of the car is too fast to create such an illusion.

Because when driving on the highway, the speed of the car will be very fast, but you will be very fast.

Why do I feel like my car is fluttering when driving on the highway? The veteran driver analyzes the reasons behind it.

Why do cars flutter on highways? Finally understood today.

Why do cars float at high speeds? Old driver: Maybe you didn't do these 4 points well.

I think it's for some special reason, don't you think so?

It's not because the car is light, it's because of the speed of the car. Drifting is different from drifting, which is when a car deviates from its driving path when you release the steering wheel or apply the brakes. When the vehicle is driving at high speed, the air resistance will increase, and the driving power of the vehicle will be more affected by the air.

For some vehicles with less streamlining, large side area and high center of gravity, when the wind direction changes greatly and the crosswind occurs suddenly, it is easy to cause the vehicle driving path to suddenly deviate and cause instability.

The second is because the tire grip is weak。The fundamental reason why a vehicle floats is that the grip of the tires is not strong enough to resist external forces such as air resistance. Therefore, the grip performance of the tires directly determines the driving stability of the car.

For example, the aspect ratio of the tire, the width of the tire, the formula are the key to determining the grip performance. Due to wheel runout and vehicle turning, the positioning parameters of the wheels will change, so the design of the stiffness, damping and changing trajectory of the suspension will also directly affect the grip performance of the car.

The second is because of the unavoidable factors in the manufacture of the vehicle itself. Turning an object from hard to soft or from soft to hard is its own technique. Of course, this can also be applied to automotive manufacturing.

The hardness of a car directly affects the driver's driving experience. Today, Japanese cars sell well because they are cheap and fuel-efficient. But there is also a common problem, that is, the chassis of the car is soft, and it is easy to float when driving at high speeds.

The stability of the body is good, but the shock absorption performance is not ideal, and the soft suspension spring has a long stroke, which is more sensitive to the body shaking response, and the time required to calm the body shaking is relatively long.

It is important to know that when the vehicle is driving fast, the roof airflow is very fast, while the airflow under the car will accumulate in a short period of time due to design reasons, forming a certain lift. As a result, the friction between the tires and the ground is correspondingly reduced, and the suspension travel is relatively flat. Elongated, causing tremors.

Therefore, if the weight of the car is related to the floats, it is more reliable to say that the lighter body does not provide enough downforce to counteract this lift.

I don't think that's the case, it's the car's center of gravity that is too high, which is very common in vans.

I think so, just adding weight to the car can reduce the flutter.

It's just a one-sided statement that the vehicle is drifting on the highway because of the weight. Heavy cars feel stable, mainly because the interior of the car is smoother than other cars when the road is bumpy or has better crosswind stability. Therefore, the reason for the fluttering of the car is inseparable from the tire performance, suspension design, body design, etc., and cannot be simply attributed to the weight.

Running at high speed means that the car loses control and has a tendency to sway. For example, when the vehicle reaches a certain speed, the body and steering wheel shake, the noise begins to increase, the vehicle is difficult to control, the direction is light, and it is prone to understeer and oversteer, which leads to a bad driving feeling. While many models are now equipped with advanced electronic stability control, high-speed flutter is still a safety issue for some cars.

When overtaking, the airflow channel between the two cars narrows, resulting in an increase in speed and a drop in air pressure, creating suction. If this happens between a large car and a small car, then in the process, the suction is unstable because the airflow is changing. Lighter cars, narrower tires are more susceptible to suction and sway from side to side more easily, which is why we try to stay away from trucks traveling at high speeds.

When the car is driving at high speeds, the pressure difference is created because the airflow velocity at the top and bottom of the car is not the same, and the airflow at the top is faster than at the bottom. The pressure on the top of the car is less than the pressure on the bottom of the car, which creates a stream of air that pulls the car up, and that's what you feel when the car is floating.

When a car pulls out of a tunnel or valley, the wind tends to be ten times stronger than the surrounding wind, which is especially dangerous. So as soon as we got out of the tunnel, we slowed down. Once tilted, the contact area between the tire and the ground will be reduced, the grip will be severely reduced, and at the same time, centrifugal force will be generated in the horizontal direction, then the steering characteristics of the vehicle will change, and understeer and oversteer will easily occur.

At this time, the driving feeling will cause the driver's unsafe psychology, which will produce the perception that the car is fluttering. The height of the vehicle's center of gravity affects the amount of load transfer on the four tires when cornering and braking, and the load is transferred to the outer wheels when cornering, and the greater the load transfer capacity of the outer wheels, the easier it is to make people feel that the car is floating. Therefore, lowering the center of gravity in the vehicle design is also an effective way to prevent the vehicle from drifting.

Unlike the average family car, which does not set the limit speed too high in order to save fuel, the sports car uses aerodynamics to maintain a high limit speed even when the car is very light. In fact, there is no direct link between weight and hair flutter. Our ordinary car owners will think that the heavier the vehicle, the less it can blow up the vehicle at high speed, the better the high-speed stability of the vehicle.

"Drifting" refers to the fact that when driving a fierce car, the car makes sharp turns left and right, and feels that the direction is out of control. To put it mildly, it is difficult for the car to maintain and restore its original driving state under the action of aerodynamic torque. "Drifting" directly threatens the driving safety of the car.

First of all, different car designs have different lifts. Lift is the difference in pressure between the bottom of the vehicle and the roof of the vehicle while driving. The plane takes off under the action of lift.

The greater the lift, the less grip the tires have, the less lateral force they have, and the easier it is to float up.

Secondly, each car will have a center of air pressure (the point of action of the aerodynamic force) and a center of mass (centroid). The relative position of the center of air pressure to the car's center of mass also affects the car's performance after floating. At the rear of the car, the larger the lateral area, the less likely it is to drift.

The shape of the body allows the car to generate strong air currents at high speeds. Because the speed of the roof is faster than the underbody, there will be a pressure difference. But the pressure under the car is greater than the pressure on the roof, and the airflow and speed difference between the two pressures will push the car up, so we will feel that the car is floating.

An important factor affecting the stability of a car is the design of the car's suspension. The design of automobile suspension mainly talks about the steering of automobile wheels and the control of automobile wheel runout. In general, the steering resistance of a car is positively correlated with vehicle speed.

The higher the speed, the greater the steering resistance of the Qidan axle car, and the more stable the car will be. However, if the car steering is too sensitive, when the car is driving at high speeds, if the steering wheel of the car is adjusted slightly, the car will steer sensitively, which will cause the driver to feel extremely insecure.

If the car floats up while driving, it has a lot to do with the car tires, and the weak grip of the car tires will cause the car to float. However, the weak grip of tires is closely related to factors such as tire size and tire pattern. If the grip of the tires is too weak, we will feel the car drifting while driving.

Most people think that the weight of a car's body is an important factor in determining the weight of a car. Although the weight of the body is too light, it will lead to the weight of the body, but there is no definite relationship between the weight of the body and the weight of the body. If the center of gravity of the car is too high, it will not only affect the braking performance of the car, but also affect the stability of the car's operation.

Therefore, when we are driving, we think that the drift of the car is probably caused by the high center of gravity of the car. Each car's center of gravity is different, and cars with a higher center of gravity are more likely to float while driving.