Most people think that "the steel plate is thick and the car is heavy and solid" is a safe and good car.

Because they are being 4S shop

Tests such as “car roof station, roof top, door station person”

Won one by one

But is the truth like this?

Let's take a look at this experiment together.

Through this experiment, Dr. Che wants to tell everyone

The argument that "the steel plate is thick and the car is heavy and safe" is untenable.

Is a car safe and reliable?

A lightweight frame that can withstand high-impact impact is the key

Do not believe? Let’s take a look at what Feng Wei said.

Please pay attention to the high energy ahead.

The egg you want is not broken, the answer is about to be announced.

In the classroom, Yu Feng personally demonstrated the "Egg Free Landing Experiment"

When the egg is placed in a steel cup, it will break directly from the sky.

And put the eggs in a three-layered cup and fall from the sky.

Buffered and intact

According to this principle, the southeast car body adopts

Buffered "segmented crush" front longitudinal beam structure

And designed a lightweight cage body

Minimize the damage of collisions

However, it is easy to make the car heavy, but it is an engineering problem.

This technology is called "car lightweight"

"Car lightweighting" means to ensure the vehicle's safety, stiffness, NVH and other performances are unchanged or upgraded, through structural design and optimization of suitable materials, select reasonable manufacturing to achieve the vehicle weight reduction engineering technology.

In fact, the concept of "lightweight car" originated from motor racing. The racing car used by racing drivers is much lighter than ordinary cars. This means that the thrust-to-weight ratio is increased and the engine output power can be generated higher. The acceleration, so the overall control of the car is stronger, in a short time can get a strong sprint speed, the braking distance is also shorter when braking.

However, the design of ordinary cars can not be so "willful", and it is necessary to balance the strength and safety of the car body. Therefore, ordinary cars tend to be more rigorous in lightweight design.

The driving partners know that the fuel consumption of the car mainly depends on the displacement of the engine and the total mass of the car. When the car is lighter, it can increase the output power, improve the handling, increase the speed, reduce the fuel consumption, reduce the exhaust emissions, and improve the safety. According to research data, if the vehicle quality is reduced by 100 kilograms, the fuel consumption per 100 kilometers can be reduced by 0.2-0.3L.

Car lightweight has such a great advantage

And engineering technology is difficult and difficult to break through

How do engineers operate?

Dr. Car gave the class notes privately

Everyone needs to study hard.

☆ Lightweight optimization of automobile structure☆

In order to reduce the weight of the car, engineers need to optimize the design of the structure to make the parts thinner, hollower, miniaturized and composited to achieve lightweight. Take the development of the southeast DX3 vehicle, engineers use a large number of advanced computer-aided means, through structural optimization algorithms and DOE analysis, iterative check of hundreds of times of vehicle strength, crashworthiness, NVH and other conditions, will The vehicle's redundancy quality is reduced and performance optimization is perfectly combined.

☆ Apply high-strength steel and lightweight materials ☆

In addition to structural optimization design, the development and application of lightweight materials is another major research direction of current automotive lightweight technology. High-strength steel, advanced high-strength steel and ultra-high-strength steel, aluminum-magnesium alloy, engineering plastics, fiber reinforced composite materials, etc. are all lightweight materials. The materials used will be considered first.

☆Adopt advanced lightweight manufacturing technology ☆

While a large number of new lightweight materials are used, advanced manufacturing processes are also applied, such as hot stamping forming processes for high-strength steel stampings, bonding and welding processes for body structure joints, etc. .

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