Chapter 540: I will solve this problem
I didn’t specify what the structure is, I just told you that we have a way to solve it and to what extent we have solved it.
In this regard, no one doubted that they were bragging. After all, it was unlikely that bragging would lead to this place.
“Well, but this machine consumes more fuel. How do you consider this?”
“Due to the high power density, the saved weight and volume can be used not only to lay out armor, but also It can be partly used for the layout of fuel. Generally speaking, the fuel consumption is higher, but the power is increased, the speed is faster, and the battery life is slightly increased. This depends on the choice of the armored soldiers, but from a technical point of view, the two-stroke is better. Better, it’s cheaper after all.”
This is a trade-off between one-time purchase cost and usage cost, but the trade-off also includes other related conditions such as power, speed, protection improvement, battery life improvement and other related conditions.
The comrades on the armored force thought for a while: "If this is the case, we would prefer two-strokes, but the improvement of four-strokes cannot be stopped as a backup power."
The troops think that fuel consumption is high. , the main reason is not because it costs more, but because it will affect battery life. If there is a way to offset some of the disadvantages while bringing other benefits without affecting battery life, then their choice will still be towards the one with more benefits.
“The torque of the two-stroke is relatively small, and the heat load is large. From your preliminary test data, the heat load is already so high that it affects the life of the engine. The extent to which the heat dissipation design can be improved is limited. In addition, although it is controlled, the vibration will inevitably increase. I think the material itself may not be able to withstand it.”
This expert is right on point. This is the most troublesome part. The structure is simple and High power density does not come without a price.
"The torque of a two-stroke is smaller than that of a four-stroke with the same power. In the same volume, due to its high power density, the torque is actually sufficient. We have also done some tests on this in the early stage. As for the engine material issue you mentioned ..."
Oops, this is a big problem!
But before he could think of what to say, Gao Zhendong raised his hand and said: "I will solve this problem."
He had already passed the preliminary plan. After digestion, the required material performance requirements were estimated. What a coincidence, it is in stock.
He has something that is decades ahead of the steel industry. Some materials that seem very high and difficult now may become ordinary in a few decades.
Some people who didn't know him were stunned. Who is this? So loud?
But with his simple words, the hearts of the Prairie Tractor Factory, National Defense Work Committee, and Armored Corps were immediately put back. Well, this is not a problem anymore.
They know best what the deputy chief engineer does and why he rises.
Anyone who has spoken to Gao Zhendong has never left empty-handed, and sometimes he can even surprise you based on your expectations.
Without even asking Gao Zhendong how to solve the problem or how long it would take to solve it, the comrades on the armored side laughed: "Then we can rest assured."
The chief engineer of the National Defense Work Committee also smiled and said: "Well, this problem is over."
While some comrades were confused, this matter just passed. Only the comrades at the Prairie Tractor Factory were a little annoyed, why didn't they Ask Vice President Gao earlier.
Since it is decided to mainly use two-stroke diesel engines, the rest is transmission and suspension. In the plan of Prairie Tractor Factory, this part is basically adopted and improved from 5DL, but quite a few comrades feel that Why not use hydraulic transmission and hydropneumatic suspension?
For this, Prairie Tractor Factory’s answer is very straightforward.
“Hydraulic transmission is inefficient, expensive, difficult to maintain, difficult to manufacture, and low in reliability.”
In terms of benefits, hydraulic transmission is really better than mechanical transmission. There is no need to list all the advantages. To put it simply, it is strong, stable transmission, easy to adjust, small vibration, self-adaptive, overload protection, etc. .
But when they heard that the efficiency was low, the people in the army calmed down for a while. If everything else can be solved through technical problems, then the problem of efficiency is difficult to solve, and there is an upper limit.
Finally got some power, and then turned back here?
“Hasn’t the two-stroke already increased the power? Isn’t the little efficiency loss used for hydraulic transmission not a big problem?”
Comrades from the Prairie Tractor Factory also have this problem. It’s not easy to answer. The low efficiency of hydraulic transmission is a theoretical analysis, but how much lower is it? I don’t know about this. After all, a hydraulic transmission with such a large torque has never been done before.
Gao Zhendong added at this time: "With proper mechanical transmission design, the efficiency can reach more than 98%, and clutch transmission can also reach more than 95%. However, the highest efficiency of the hydraulic coupling is 98%, and the hydraulic torque converter is basically Below 90%. For hydraulic transmission, a coupler and a torque converter are both required. The combination of the two is still a bit large for the current stage.”
At first glance, there is a 10% loss. Even the comrades in the armored force can't sit still. It's just a joke, 10%, just kidding, the power is not rich, this loss, why don't I pile up more armor?
The leader of the National Defense Working Committee looked at Gao Zhendong: "Have you calculated it?"
Gao Zhendong nodded: "Yes, I have calculated it."
Actually, no, I looked for it.
However, the data in a few decades will not be much higher than this. In the current technical environment, it is still unclear whether the number he mentioned can be achieved, but mechanically, we should be more optimistic. After all, technology is not so cross-generational. serious.
Originally, the hydraulic transmission of the second-generation tank could not be developed, which does not necessarily mean that something cannot be made. It is also possible that after making something, the indicators are too poor to be used. The comrades from the National Defense Work Committee and the Armored Forces looked at each other and said: "Then let's leave this issue as it is. Let's deal with mechanical transmission and hydraulic transmission. Let's wait until we are more mature."
In fact, hydraulic transmission There is another problem with the transmission that Gao Zhendong did not mention, that is, when the temperature of the transmission fluid reaches a certain level, its properties may mutate and its viscosity drops sharply.
Early hydraulically coupled four-wheel-drive SUVs suddenly lost power when climbing steep hills. This problem was caused by this problem.
However, Gao Zhendong is not sure whether the transmission fluid we can use now also has this problem, so he simply did not mention it. Anyway, the efficiency is enough to be prohibitive.
“About hydropneumatic suspension, fundamentally speaking, the structure is complex, which brings about the same problems in manufacturing, maintenance, and cost as hydraulic transmission. However, the biggest problem is that it is heavy! In the existing technology Under certain conditions, based on the planned weight of the second-generation tank, if you want to support it, the weight of the hydropneumatic suspension can be 1.5 to 2 tons heavier than that of the torsion bar.”
Comrades working on power also followed suit. Zhendong has learned a lot, and he can see that the army is more eager to pile up armor and firepower than anything else. You can do whatever you want, don't affect my power, take up less of my weight, just put the structure and weight issues on The most important position.
Sure enough, as soon as these words came out, the comrades in the armored forces immediately started to murmur, isn’t this thing a little cost-effective?
To be honest, the benefits brought by the hydropneumatic suspension at this stage are actually the icing on the cake. It is more comfortable, more stable, and the speed "may" be higher. As for adjusting the body posture, it is not useless. , but it's not worth paying a significant price for.
Gao Zhendong also thinks that torsion bars are very good. Not to mention second-generation tanks, third-generation tanks have undergone major model changes, and they also use torsion bars. It is unnecessary for high-tech for the sake of high-tech.
When it comes to the latest new light tanks, firstly, the technology has improved, and secondly, the combat environment and use conditions of that tank are relatively special, so it is equipped with hydropneumatic suspension.
It was expensive, troublesome, and heavy. This made the comrades of the Armored Forces discuss with the National Defense Work Committee and quickly made up their mind to go with the torsion bar. With these money, energy, and weight, we Use it for something else.
These big chunks have been settled, and what remains is the next-level subsystem issue.
As for the car body, the comrades of the armored forces still insisted on the program requirements of a rear-mounted engine, a 3-person crew, and an automatic loader. Gao Zhendong also followed the trend. In this matter, 3 and 4 people all agreed Okay, it's not too important. What if the reloading machine can be completed under my influence?
You still have to believe in comrades. If it really doesn’t work out, at worst, just add people back.
As for the turret, there is a lot of controversy.
About the question of whether to weld the turret or use a cast turret.
The comrades at the Prairie Tractor Factory want to use welding, but most of the comrades prefer casting.
In fact, the reason for using a cast turret has nothing to do with the small projected area of the cast shape. The welded turret can also be very small.
The main reason is that the thick plate welding process is immature. When the tank base armor is thin, riveting and welding turrets are actually not uncommon. Later, for a period of time, cast turrets became rampant. For no other reason than thick plate welding is difficult to do.
Most people tend to use cast turrets, and that's why. At the same time, there is another reason, which has something to do with Gao Zhendong.
593 cast armor steel is nickel-free, while 592 rolled armor steel contains nickel.
We have no nickels!
Everyone was quarreling and arguing about this issue.
Gao Zhendong thought for a long time before raising his hand and speaking.
“Comrades, let me say a few words.”
What else is he going to say? Some people are happy, and some people are very curious.
“What the comrades just said is correct.”
Oh, it’s just a mess.
"My opinion is that if the problem of nickel raw materials cannot be solved within a few years, then casting will be used. If it can be solved, welding will be used."
Gao Zhendong first made a hypothesis.
And he raised this assumption because he knew that when the second-generation tank is developed and mass-produced, the nickel problem will probably be solved. Others may not know it, but the National Defense Work Committee It's impossible for people not to know, but even if the people in the National Defense Work Committee don't know, he also knows.
The nickel mine in the northwest should be almost there.
“Even if nickel ore can be solved, what about thick plate welding?” the leader of the National Defense Work Committee laughed.
"I'll solve this problem."
Here it comes, here it comes again!
(End of this chapter)