Chapter 433 Bearings are a big problem

Noine looked at the computer screen with clearly marked documents on how to increase the range and how to use the rockets to attack ships. For a moment, he didn't know how to evaluate them.

In fact, let alone him, even Zhang Hongyin was a little confused when he saw this plan for the first time.

The launch dynamics of rockets, especially rockets with a large aspect ratio, is an extremely complex subject in itself, and a long-range ballistic weapon with a range of more than 2 kilometers like the Guardian 300 has to experience multiple completely different environmental conditions during the entire flight. The temperature layer, after all, the design idea has completely separated from the scope of general artillery weapons.

Allowing customers to change the missile body design on their own can easily make the already poor ballistic computer even worse.

Especially extending the range of ballistic weapons cannot be solved by adding more fuel.

If you mess with the upper structure of the rocket, the stability will be deteriorated and the rocket will fly randomly and completely without accuracy after launch, or it will disintegrate before hitting the target.

At that time, the Iraqis put two Scuds together and assembled them into a ballistic missile with a longer range. However, almost none of them landed normally after launch, and in the end they were all included in the Patriots' interception "results."

However, Rui Xiaoting said very confidently that he had fully considered the issue of launch dynamics. The new missile body after replacing the seeker can share launch table data with the prototype missile, and the final stage can also be adjusted by relying on active radar guidance. According to the flight attitude, the accuracy of hitting a frigate dozens of meters long can still be guaranteed.

As for the extended-range version, there are no changes to the missile body itself at all, but the maximum range is extended by modifying the parameters of the solid rocket motor.

In short, Rui Xiaoting quickly convinced Zhang Hongyin, who was worried, with professional and accurate calculation results.

Of course, customers don’t understand technology, and detailed design data are commercial secrets and cannot be fully disclosed, so we can only rely on test launches to speak for themselves.

But it's not over yet.

The PPT on the computer screen quickly turned to the next page.

“In addition to the three existing ammunition modes, we also plan to produce supporting drones for the Guardian 2 rocket system, which can be loaded directly into the launch box, launched through booster rockets, and recovered by arresting nets. When necessary, Under such circumstances, artillery reconnaissance and meteorological observation missions can be carried out, as well as larger-caliber ballistic missiles launched from the same frame..."

If Rui Xiaoting learned anything else besides the usage of TORCH Multiphysics at Beijing Hang University, it must be Chang Haonan's cake painting skills.

Whether it was the drones or ballistic missiles I just mentioned, it would be too much to say it was a plan. In fact, it was just the brainstorming content of he and Zhang Hongyin on the way to the shooting range.

After all, these days, the entire Chinese military has few serious drones, and the domestic aviation field is still close to blank in this regard.

This is not a problem that those in the weapons industry can solve.

However, Noine on the opposite side obviously didn't know this. He thought that these were very mature technical solutions like the previous parts, so he asked for a lot of details.

Fortunately, half an hour was not long, and before Rui Xiaoting could no longer continue editing, it was time to conduct a launch test.

On the monitor not far away, the 6*6 launch vehicle just now was speeding along a dirt road. After several turns, it stopped at the preset launch position, and then slowly lowered the support frame.

"Because the fire control computer has been upgraded, there is no need to wait until we enter the firing position to calibrate the shooting elements. I have already preset the coordinate data of the target in the preparation area, and now I only need to retrieve it. Speeding up the reaction speed from entering the position to launching..."

Zhang Hongyin explained from the side.

As soon as he finished speaking, with a burst of dust flying, the first rocket broke through the sealing piece in front of the directional tube and shot out like an arrow off the string.

Then came the second and third shots...

"Compared with the previous generation product, we have modified the design of the frame, hydraulic mechanism and directional tube. The firing interval between each two rounds has been shortened to less than 2 seconds, and the firepower density is also more guaranteed."

As he spoke, all six rockets were fired, the support frame of the launch vehicle was raised, and then the launch site was withdrawn as quickly as possible.

The whole process probably lasted less than four minutes.

"The shorter the time from entering the position to withdrawing from the position, which means the lower the danger of the firing unit. Compared with the 10-15 minutes of transfer time for most artillery units, our survivability can be improved by about four times. "

"Of course, with the range of the Guardian 2, there aren't many weapons that can threaten it..."

By this time, the way Noine looked at the screen was different from the beginning.

Although there was no movement in the target area, he had already made up his mind that as long as the final accuracy was not too outrageous, he would definitely place this order.

After a long wait.

In another camera, six consecutive fires covered the entire target point with a white circle...

"boom!"

Noine smashed the table excitedly:

"Boy, I want to take a look at your factory."

……

Chang Haonan, who was far away in the capital, naturally didn't know that Rui Xiaoting had already mastered Guardian 2 after getting his software.

After sending the design of the Air Police 200 to the Fucheng Wind Tunnel, he naturally returned his main focus to the aeroengine.

Although the compressor and turbine experimental devices have not yet been put into use, this does not mean that related research cannot be carried out at all.

During this period of time, Chang Haonan obtained a vast amount of aviation engine usage data across the country since the 80s from the Committee of Science and Industry.

Especially breakdown and accident data.

Judging from feedback on the use of turbojet 7/13, Spey MK202 and other types of aero engines, including civilian models, the main pain points are not only the fluid dynamics design that has always attracted more attention, but also many mechanical manufacturing and Mechanical design issues.

For example, he found that among the in-flight parking accidents caused by all engine components, only the main shaft high-pressure rotor front fulcrum (three-point) bearing and the LPT shaft fulcrum (four-point) bearing accounted for nearly 40%, which affected flight safety. The main problem.

In aviation engine maintenance data, replacement records of parts at these two locations are often seen.

Taking the turbojet 14 that has just been put into use as an example, the three-point ball bearing theoretically needs to be replaced 3-4 times during the entire life cycle. For the SPEI MK202 with a longer life span, the number of replacements will reach 6-7 times. This time, it added a considerable amount of workload to the ground staff and seriously affected the aircraft's readiness rate.

The fundamental reason is that during the take-off, climb, cruise, landing and other stages of the aircraft flight cycle, the rotor system load, speed and other working condition parameters continuously change with the engine flight envelope. Typical service conditions are high speed, heavy load, high temperature, etc. During flight, aircraft engines are affected by short-term transient conditions such as surge and rotor imbalance. As a result, the two bearings involved in high-pressure rotor support often have to withstand extreme operations such as speed changes, load changes, over-rotation, oil cuts, and oil starvation. Under the test of environmental conditions, early failures and benign contact fatigue failures originating from subsurface layers often occur.

As for a solution...

Considering that even engines like the CFM56 are plagued by bearing failures, simply replacing them with better materials is definitely not enough.

It is also necessary to analyze the three-point contact state of the main load-bearing area, the hoop stress of the inner ring and cage performance under high-speed operating conditions, the lubrication state, and the temperature field for the typical service conditions of aeroengines. By calculating the changes in operating conditions and structural parameters, The relationship between bearing performance and bearing parameters enables optimization of bearing parameters and surface fatigue and damage resistance design.

And this happens to be the part that Chang Haonan plans to focus on next.

Because this technology is also crucial for the heavy-duty die forging press project that may soon be launched.

"Then let's start with you..."

Chang Haonan put down the statistical form he had just prepared, picked up the receiver of the red landline phone from the table, and dialed Ding Gaoheng.