Chapter 518 Main battle tank chassis in one step
The introduction of absorption turboprop 7 and turboshaft 7 is, after all, 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. After a few brief remarks, he was ready to stop.
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 handed over his duties and is ready to return to the capital?"
During the test period of 624, the relationship between the two was relatively familiar.
After suffering some blows at the Turbofan 10 design review meeting last year, Jiang Fuhe followed persuasion 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 was having a hard time making a choice, so he simply followed Jiang Fuhe in the direction of the canteen:
“We can put aside the things in the capital first and go to Shengjing first. Now that the necessary test data has been obtained, the compressor design of Turbofan 10 must be finalized and transferred to the test process as soon as possible.”
Since the 624 Institute is the only ground test base for aerospace engines in China, all The whole process of research on model aviation 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 stopped even moving his feet:
“Is this...are we about to move into the testing process?”
< br>He has worked in the 624 Institute for half his life, and has been participating in the research and development of high-altitude platforms with Liu Zhenxiang for the past ten years. He thinks that he knows the entire research and development process of aeroengines.
Except for some special circumstances, the tests that require personal intervention by the chief designer 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, after each subsystem is designed and manufactured, its own availability needs to be determined before being integrated into the entire 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 ordinary engine projects, shouldn’t the design plan be still being finalized at this time?
Am I falling behind?
Jiang Fuhe fell into self-doubt for a while.
“The situation of Turbofan 10 is quite special.”
Chang Haonan looked at Jiang Fuhe who had a ghost expression on his face, smiled and said with relief:
"You also know that the pre-research of this model has actually 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, as well as the theoretical methods of the overall design, so I knew that all subsystems were generally synchronous and parallel. Development, and I am personally responsible for the compressor, so the efficiency is naturally higher."
"..."
Jiang Fuhe didn't know how to connect this problem for a while. Speech at Versailles.
He originally wanted to ask about the 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 who is responsible for the research and development of the overall project, 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 is a little worried.
What if Chang Haonan said that he was confident that the components would be tested over and over again...
Then we would be completely unable to continue talking today.
So I had to respond with silence.
Chang Haonan looked at the other party's reaction and felt that the words he just said did not 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 Academician Liu say before that the institute has started to build the second axis-oriented building. The high-altitude platform for outputting the engine, 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 be produced in the factory. Just do non-standard bench testing, and then you have to install it 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 an aviation power power.
On the one hand, for each type of engine, even if all tests are repeated, several thousand working hours and about half a year of bench testing are required.
As long as there are more concurrent models, you 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 talking about this topic, Jiang Fuhe’s awkward expression just now softened a lot:
“With the previous experience of Channel 1, the progress of Channel 2 will be much faster. At present, there is only one hydraulic dynamometer 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 measures the flow and pressure of the liquid. changes to calculate power output.
"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."
< br>"However, we are already in contact with several suppliers at home and abroad 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 Something about the M250 engine.
Even if it is a model with imported technology, the tests that should be done still have to be done.
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 was relieved:
"That's good. Turboshafts and turboprops may not be as important as turbofans in the field of national defense, but in the field of national economy It can still play an important role, but it’s better not to be too technical.”
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.
Relative to the United States, China's current comprehensive national strength is much worse than that of the Soviet Union at its peak, and it is in a time period like the 1990s when the external environment is generally loose. It is even less likely to waste on some non-core links. resource.
……
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, coupled with 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. It's not easy for people who have dealt with him to follow.
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...
Of course Chang Haonan is also aware of this situation.
However, it is impossible for him to bring half of the weapons industry system to a standstill.
Secondly, they did give too much...
Therefore, it is not surprising that some familiar faces appeared in the seminar, and even the results achieved 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, we have re-established the mechanical model of the vehicle chassis based on our experience during this period. 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... …”
The person standing on the stage to introduce was Lin Qingsong, a senior engineer 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 walking system, seven typical vehicle operating conditions were selected.”
“Eight times the impact load, used to simulate the high-speed movement of a tracked vehicle Under normal conditions, uneven roads face the impact of track pads..."
"After passing a "convex" vertical wall, the vehicle is usually supported by the two middle sets of road wheels to support the overall structure and is loaded with 4 times the static load..."
"After passing 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 depression angle, focusing on the stiffness and load-bearing capacity of the seat ring position..."
"The artillery fires at the maximum depression angle of 90° to the side..."
"After calculation, we It was 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 the issue of protection capability. It can be found here Subtract 1.1 tons of mass..."
"The traveling part, especially the suspension part, has insufficient strength under eight times the impact load. It may cause fatigue damage and damage the traveling mechanism during long-term high-speed off-roading. This part needs to be reinforced, and the weight just saved can be considered to be added here..."
"The engine compartment is only composed of tailor-welded outer panels. Previously, the only way to improve the structural stiffness performance was limited to The single path of increasing the thickness of the outer plate ignores the structural load-bearing design potential, which can further reduce weight, improve the weight distribution of the vehicle, optimize the overall dynamic balance, and leave room for weight increase for future new turrets..."< br>
"..."
"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 requirements 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!"
(End of Chapter)