The day after Mu Yang returned to H City, he came to the Vehicle Engineering Research Institute and Advanced High-Speed ​​Rail Laboratory.

Xinghai Group's high-end high-speed rail train is named "XHRH-500" (Xinghai Group Railways High-speed, operating speed 500 kilometers). Currently, it only has room temperature models. If used in cold-resistant zones, some materials need to be made of low-temperature resistant and high-toughness materials.

Otherwise, brittle fracture will easily occur due to low temperature (strictly speaking, for low-temperature materials, it means below minus 46 degrees Celsius).

The maximum test speed can reach 650 kilometers per hour, but the designed operating speed is 500 kilometers per hour.

This XHRH-500 refers to the design of new high-speed rail vehicles without changing the track, including vehicle design optimization, traction system upgrades, signaling systems, etc.

Vehicle design optimization mainly involves reducing the weight of the vehicle body, optimizing the appearance of the vehicle body, and reducing wind resistance to improve the acceleration performance of the vehicle.

It’s not that faster acceleration is better, it depends on the person’s tolerance and comfort level.

In this regard, Xinghai Group designed a new car body shape.

In terms of body weight, the overall weight is slightly lighter than the current CER2-300 body, but the structural strength has not decreased, but has increased a lot.

For example, the CRH2-300 EMU with a speed of 300 kilometers per hour uses a large-section hollow profile aluminum alloy body, with the thinnest part being only 5 mm. Each carriage weighs about 7 tons, making it the lightest EMU of its kind in the world.

.

But its load capacity is actually between 5 tons and 15 tons. If it is too light, it will float at high speeds.

XHRH-500 uses the same aluminum alloy material, but Xinghai Group’s aluminum alloy has stronger performance and more compact structure, so the vehicle is lighter in weight.

In terms of body shape, the length and width of the XHRH-500 are not much different from those of conventional EMUs, except that the chassis is shorter and the overall height is also shorter.

The front of the car is longer and more pointed, and has some more aerodynamic holes to balance the car body and prevent the car body from floating due to excessive speed.

But within a speed of 200 per hour, they can provide buoyancy, allowing the car to start faster.

In terms of traction system upgrades, the main thing is that the traction system of high-speed rail vehicles should be equipped with efficient motors and control systems to provide greater traction and can quickly respond to the driver's instructions to achieve rapid acceleration and deceleration.

Motors and control systems are the core technology of vehicles.

The traction motors of CRH2 EMUs rely on imported brands such as Mitsubishi and Hitachi.

Xinghai Group's electric motor technology is excellent and has been supplied to its own car brands. Although it is two different things from EMU motors, there are many technologies and processes in common.

The advanced high-speed rail technology purchased by Muyang includes these core technologies, so the traction motors developed are much more powerful than their international counterparts.

For other key components that are highly dependent on imports, such as "high-speed rail bearings," Xinghai Group made a breakthrough a few years ago.

Muyang will also focus on the reliability and ease of maintenance of the traction system.

For example, the modular design makes it easier to repair and replace parts;

At the same time, an intelligent monitoring and maintenance system is introduced to detect vehicle operating status in a timely manner and provide maintenance recommendations and predictive maintenance services, thereby minimizing failures and extending vehicle service life.

Software has always been Xinghai Group's strength, so Mu Yang is not worried about this aspect.

Mu Yang came to the laboratory and listened to the project leader's report.

"Chairman, the length of our test track is limited. We have to slow down when we reach the corners. After all the tests are completed, we need to test on the real track. This requires support from the company. We do not have the resources in this area."

Mu Yang nodded and said: "Well, you don't have to worry about this real track test. Prepare all the preparations first, and then report it to Mr. Zhou. On which lines do you want to test?"

"The line from H City to Ningcheng or to Shencheng is the best. It is convenient for testing."

"Okay, what tests have you conducted so far?" Mu Yang asked again.

"Aerodynamic tests, braking tests, noise tests, track tests and electrical tests are now required to conduct impact tests to test the vehicle's response and stability when encountering sudden impacts to ensure that the vehicle has better impact resistance.

.”

The project leader explained and asked his subordinates to bring over the test report.

Mu Yang took the test report and read it carefully.

He knew the test conditions and standards well and asked questions while watching.

According to noise test data, under the same speed and load conditions, the noise decibels are 30% lower than those of internationally advanced vehicles.

The speed of 500 kilometers per hour is not much different from the domestic CHR2 train speed of 280 kilometers per hour. The main source of noise is wind noise.

The XHRH-500 car body is smoother, such as the outer glass windows, which are almost smooth with the car body.

Noise control is very important. If it exceeds the comfort level of the passengers, the experience will be very poor. Their ears will be constantly buzzing, and no one can stand it.

XHRH-500 is much more advanced than CHR2 in terms of intelligence, such as road condition monitoring. If there are stones or other obstacles on the track two hundred meters ahead, the train will automatically slow down quickly.

If there is a natural disaster such as a mountain collapse ahead, a warning will be given in advance and the vehicle speed will be reduced. Of course, this must be connected to the star network and approved by the monitoring system.

Like mud or dust on the track, high-pressure gas is blown on the track surface in front of the wheels, which is equivalent to maintaining the track, so the more you run, the cleaner it will be.

The entire vehicle is monitored, such as wheel defects, insufficient air pressure, car body derailment, changes in wheel pressure, etc. All are monitored in real time, and any problems are prompted just like a luxury car.

The sections traveled by the train are also monitored in real time. If there is a problem with the track, it will be recorded and fed back to the main system. This function also facilitates railway workers to maintain the track and quickly know where the problem is.

After reading the test report, Mu Yang expressed satisfaction: "Yes, the test will continue according to the plan. It must be stable and not rushed. We have worked hard on this project for three and a half years, and we are not short of that time."

"Okay, Chairman, I will strengthen supervision and implement it."

Next, Mu Yang and the person in charge left the laboratory and came to the test workshop, where a 16-car XHRH-500 train was parked on the track.

The company has developed a total of 16 trains, 8 moving and 8 pulling.

This is a silver-white car body, like a rocket head. In addition to the train number, there is also the Xinghai Group's LOGO on the car body.

Mu Yang climbed into the carriage and saw that there were many counterweights parked in each carriage, which was equivalent to being full of passengers and luggage.

The long and narrow workshop leads to the test track, and no tests were conducted here.

Mu Yang came to the front cab of the car. This was his first time entering the cab. He had never had that opportunity before.

The interior is somewhat similar to the CHR2 train, but it is more intelligent and has many automated functions. For example, when the train enters a tunnel, it automatically adjusts the speed and brightness of the lights to adapt to the light and road conditions of the tunnel.

There are also some intelligent processing. For example, when a train fails, the system will automatically detect and alarm, and provide the driver with corresponding emergency measures. These measures include automatic train parking, emergency braking, etc.

In order to facilitate operation, physical buttons are necessary.

Mu Yang sat on the driver's seat and felt the comfort and support of the seat, which allowed him to quickly adapt to the driver's position.

He looked up at the guidance screen in front of him. When it started normally, it displayed the speed, position and track information of the train.

Now the engine is turned off and the wheels are all locked to avoid misoperation causing test accidents.

After Mu Yang inspected it for a while, he left the carriage with the person in charge. Before leaving, he gave him some instructions.

A few days later, it was July 10th.

After repeated tests, the XHRH-500 train was declared to have passed the test perfectly.

The successful test of this train marks that Xinghai Group's technical strength in the field of high-speed trains has reached the top international level. If it can be popularized, it will make an important contribution to the development of domestic high-speed rail and improve the technical level of global high-speed rail.

Of course, this was not passed in one go. The car body had been developed for a long time, and the test alone took nearly a year.

It has been three and a half years since the project was established. It can be said that it is a very time-consuming project for Xinghai Group.

On July 12, Xinghai Group announced the successful test of the XHRH-500 advanced train.

Xinghai Group stated that the successful test of the XHRH-500 train is an important milestone in the development history of Huaguo high-speed trains.

The company will continue to promote the innovation and development of high-speed railway technology and make more contributions to achieving the leading position of domestic high-speed railway.

At the same time, Xinghai Group also plans to start commercial operations in the next few years and expand the international market so that more people can enjoy the convenience and comfort brought by high-speed trains.

In addition, relevant parameters are announced on the official website.

【XHRH-500 parameters】

[8 knots, 480 kilometers per hour = 4M4T (4 motion, 4 tow)

8 knots 500/550 kilometers per hour = 6M2T

16 knots, 480 kilometers per hour = 8M8T

Car type: first-class car, second-class car, dining car

Maximum test speed: 651km/h (8 knots, 6M2T)

Gauge: 1435 mm (standard rail)

Adaptable platform height: 1250 mm

Traction power: 7200 kW (2400KW higher than CHR2)

Body type: large hollow profile aluminum alloy

Leading vehicle length: 27500 mm (ratio)

Intermediate vehicle length: 25000 mm

Vehicle width: 3380 mm

Vehicle height: 3500 mm (ratio)

Traction converter:Xinghai Group

Traction motor: Xinghai Group (450kW) x16 Starting acceleration (m/s2): 330

Emergency braking distance (m) (initial braking speed 200km/h): ≤600

(Initial braking speed 500km/h): ≤2000
To be continued...