Chapter 518 One-Step Main Battle Tank Chassis

After all, the introduction of the absorption turboprop 7 and the turboshaft 7 is just a small project with little involvement.

The two of them had already finished talking about everything they could before they even reached the door of the building.

Ren Bingda also knew that building relationships should not be done too hastily, and after a few brief remarks, he was ready to stop there.

Chang Haonan walked a few steps alone and stood at the intersection, hesitating whether to go back to his residence or to the canteen.

At this time, I happened to meet Jiang Fuhe who had also just come out of the building.

"Mr. Chang has finished his shift and is ready to return to the capital?"

During the period of testing conducted by 624, the relationship between the two was quite familiar.

After suffering some blows at the Turbofan 10 design review meeting last year, Jiang Fuhe followed the advice and embarked on research on vertical take-off and landing engines.

Of course, it is still in a very preliminary stage, mainly researching the technology related to large-angle deflection of the nozzle, and demonstrating the feasibility of the two routes of lift fan and lift engine.

But fortunately, in a short period of time, you don’t have to worry about your research direction being cut off.

Chang Haonan had a hard time making a choice, so he simply followed Jiang Fuhe in the direction of the canteen:

"We can put aside the matters in Beijing for a while and go to Shengjing first. Now that the necessary test data has been obtained, we need to finalize the compressor design of the turbofan 10 and enter the testing process as soon as possible."

Since the 624 Institute is the only aero-engine ground testing base in China, the entire research process of all types of aero-engines needs to be dealt with here.

Therefore, this type of information on R&D progress and timetables also needs to be exchanged.

Now it is nothing more than conveying it through Chang Haonan himself instead of the administrative liaison officers of both parties.

However, after Jiang Fuhe heard this, he was so shocked that he even stopped moving his feet:

"This...are we ready to move into the testing process?"

He has worked in the 624 Institute for half his life, and has been involved in the research and development of high-altitude platforms with Liu Zhenxiang for the past ten years. He believes that he knows the entire research and development process of aero engines.

Tests that require personal intervention by the chief designer, except for some special circumstances, will not be quality and performance tests of small parts——

Much of this work is even done by second-tier suppliers.

So what Chang Haonan said is, at least, it is a component test.

That is to say, after each subsystem is designed and manufactured, its own availability needs to be determined before being integrated into the aircraft engine.

But the design review of the Turbofan 10 has only been completed for less than half a year, so why are we starting to discuss the testing process?

For an ordinary engine project, shouldn't the design plan still be finalized at this time?

Am I falling behind?

Jiang Fuhe fell into self-doubt for a while.

"What's the situation with Turbofan 10? It's quite special."

Chang Haonan looked at Jiang Fuhe who looked like he had seen a ghost, smiled and comforted:

"You also know that the pre-research of this model has actually been started for some years, and it certainly cannot be compared with those truly new projects."

"Among other things, before I officially took over the Turbofan 10 project, I was already studying some key technologies of the compressor and the theoretical methods of the overall design, so I knew that all subsystems were generally synchronous and parallel. I am personally responsible for development and compressor, so the efficiency is naturally higher.”

"..."

Jiang Fuhe didn't know how to respond to this very Versailles speech.

He originally wanted to ask about specific arrangements for component-level testing.

Because normally, this process needs to be repeated many times compared to the whole machine test.

For the chief engineer responsible for overall project research and development, how to determine the timetable to achieve the most efficient use of time and resources is a challenging issue.

But the words came to my lips several times, but in the end I still didn’t ask.

Mainly Jiang Fuhe was a little worried.

What if Chang Haonan said that he was confident that the components would be tested again and again...

Then we would be completely unable to talk about it that day.

So I had to respond with silence.

Chang Haonan looked at the other party's reaction and felt that what he just said didn't seem to have much comforting effect.

But he couldn't think of any better way, so he had to change the topic:

"By the way, Mr. Jiang, I heard from Academician Liu before that the institute has started to build a second high-altitude platform for shaft power output engines. How is the progress?"

"Some time ago, several comrades from Jianning Engine Group complained to me that the new turboshaft 8 they developed could only undergo non-standard bench testing at the factory, and then it had to be installed directly."

The putting into use of the SB101 high-altitude platform can be regarded as an end to China's inability to conduct fully autonomous aviation tests in the past few decades.

However, a high-altitude platform is definitely not enough for China, which aims to become a powerful aviation power.

On the one hand, for each type of engine, even if all tests are carried out once, several thousand working hours and about half a year of bench testing are required.

If there are more concurrent models, you will have to wait in line.

On the other hand, the SB101 test bench can only be used to test turbojet and turbofan engines.

Engines such as turboprop, turboshaft or piston require completely different test benches because they output shaft power and have different requirements for air bleed indicators.

The engine test bench is unique to 624 in China.

Therefore, when Jiang Fuhe talked about this topic, his awkward expression just now softened a lot:

"With the previous experience of Platform 1, the progress of Platform 2 is much faster. At present, there is only one hydraulic dynamometer left that is not in place yet."

The hydraulic dynamometer is the core structure for measuring shaft work. It uses a hydraulic transmission system to simulate the load and calculates the power output by measuring the flow and pressure changes of the liquid.

"This thing is not said to be complicated, but the aerospace engine has high output power and fast rotation speed, and it also needs to rotate at high speed in a water environment for a long time, which tests the accuracy, lifespan and sealing of some parts."

"However, we are already in contact with several domestic and foreign suppliers for bidding, and we should be able to put it into trial operation within the year."

The reason why Chang Haonan thought of turning the topic to the new test bed was actually because he had just chatted with Ren Bingda about the M250 engine.

Even if it is a model with imported technology, the tests that should be done still have to be done.

However, Haofa Group has never developed turbine shafts and turboprops in the past, and does not have the conditions for in-factory testing.

Therefore, when Jiang Fuhe said this, he felt relieved:

"That's good. Turboshafts and turboprops may not be as important as turbofans in the field of national defense, but they can still play an important role in the national economy, so we should not be too biased."

Chang Haonan didn't pay much attention to the supplier issue just mentioned.

After all, he is not the chief engineer of the test bench and has no authority to interfere with such details.

On the other hand, he also believes that as long as he can ensure that the key core technologies are in his own hands, in order to improve the overall efficiency of the project, there is no problem in choosing imported shelf products as suppliers.

The United States' superior technological capabilities over the past half century have largely benefited from its ability to integrate R&D and industrial chains from Europe, Japan and South Korea without having to do everything personally.

In comparison, in the Soviet Union's economic cooperation system, only East Germany and half of Czechoslovakia could barely provide help, which was really at a disadvantage.

Compared with the United States, China's current comprehensive national strength is much worse than that of the Soviet Union at its peak. China is also in a period of generally relaxed external environment like the 1990s, and it is even less likely to waste resources in some non-core links.

…

At the same time, in Beijing, the Northern Vehicle Research Institute.

Just inside the previous small auditorium, a technical seminar on the Army's main battle equipment models was going on.

With Chang Haonan's current LV2 management capabilities and his control of key technologies, he can completely control the project remotely to a certain extent.

Therefore, although he has been in Fucheng for more than a month in the past month, and his main focus is on the turbofan 10 project, the research and development work of the die forging press has not stalled.

Of course, without the direct leadership of the chief designer, efficiency will still be affected to some extent.

But even so, for Yan Yongnian and other old comrades who participated in the last die forging press competition, the current progress is very gratifying.

For an arms industry system that focuses on participation and learning, slowing down is a good thing——

Chang Haonan's design and calculation ideas are quite out of the ordinary, and it is not easy for people who have not had much dealings with him to follow him.

What else...

In fact, many comrades work on both sides between their unit and the die forging press.

This is also easy to understand.

Under Zhang Yong's instruction, the technical staff who were transferred to work on projects with Chang Haonan were basically the backbone of each unit and project.

For many research institutes, if they completely leave this group of people, their business will collapse directly...

Of course Chang Haonan is also aware of this situation.

However, it is impossible for him to paralyze half of the weapons industry system.

Secondly, they did give too much...

Therefore, it is not surprising that some familiar faces appeared in the seminar, and even the results produced by Chang Haonan were not surprising.

On the huge curtain in front of the auditorium is a tank that looks a little out of place.

To put it simply, the turret is too small compared to the chassis.

"Mr. Zhu, Mr. Mao, based on our experience during this period, we have re-established the mechanical model of the vehicle chassis. Considering that the research and development of the weapon system is still in progress, we will still use the original model of turret for the time being..."

Standing on the stage to introduce it was senior engineer Lin Qingsong who was responsible for the research and development of the chassis of the new third-generation main battle tank.

The two people sitting first below are naturally the chief and deputy chief engineers of this model.

"For the stiffness and dynamic balance of key parts of the body and running system, seven typical vehicle operating conditions were selected."

"Eight times the impact load is used to simulate the impact of tracked vehicles on track pads on uneven roads when moving at high speeds..."

"After passing a "convex" shaped vertical wall, the vehicle is usually supported by the middle two sets of road wheels to support the overall structure and is loaded with 4 times the static load..."

"After crossing the trench, the first and last set of road wheels of the vehicle contact both ends of the trench through the track shoes and are suspended in the middle. They are also loaded with 4 times the static load..."

"The artillery fires forward at the maximum pitch angle, focusing on assessing the stiffness and load-bearing capacity of the seat ring position..."

"The artillery fires to the side at a maximum depression angle of 90°..."

"After calculation, we found that the maximum stress in the above seven working conditions is much smaller than that around the seat ring, especially the yield limit of the front structure of the seat ring, and the seat ring part will be completely blocked by the turret under normal circumstances, and it does not involve protection capability issues. , you can subtract 1.1 tons of mass here..."

"The walking part, especially the suspension part, is not strong enough under the condition of eight times the impact load. Long-term high-speed off-road driving may cause fatigue damage and damage the walking mechanism. This part needs to be reinforced. The weight just saved can be considered. Add it here..."

"The engine compartment is only composed of tailor-welded outer panels. Previously, the only way to improve structural stiffness performance was limited to a single path of increasing the thickness of the outer panels, ignoring the structural load-bearing design potential, which can further reduce weight and improve the vehicle's performance. Weight distribution, optimizing the overall dynamic balance, and leaving room for weight increase for future new turrets..."

"..."

"After re-optimization, the overall weight of the car body has been reduced by 3.74 tons, of which no less than 2.35 tons can be left for enhanced protection on the front of the car body..."

"The strength of the running mechanism fully meets the requirement of eight times the impact load, the safe cross-country speed can be increased from the past 35-40km to 55-60km, and it meets the stability requirements for firing while traveling at this speed..."

"In general, we believe that this optimized site design can fully meet the needs of future new tank upgrades in one step, and should be transferred to prototype trial production!"