The Rise of Heavy Industry 1980

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design scheme of the power system, which is undoubtedly a highly classified document, does not have the opportunity for outsiders to see.

But at this moment, Zong Shiguo agreed without thinking too much. He shouted to the assistant outside the door, and the assistant came in and said: "But Elder Zong, you have a very important

meeting at night, which is with the leaders of the provincial department, and it will be too late if you don't set off......" Zong Shiguo patted his head hard and said: "Look at my memory ......" Zong Shiguo

is very embarrassed, and the meeting with the leaders of the provincial department cannot be delayed, but at the same time, he is also very much looking forward to discussing the system plan with Wang Chaoyang.

He couldn't say why, but he had a hunch that a discussion with the young man might lead to a breakthrough in the system.

"Why don't I get into your car, and let's see the plan while we hurry?" Wang Chaoyang suggested.

"This suggestion is good, it will take an hour to go to the province, which is enough for us to discuss. When I get to the place, I'll let the ponies send you back!" Zong Shiguo said loudly, leaving the exhibition hall with everyone, walking to the parking lot, and beckoning Wang Chaoyang and them to get into the car.

Zhang Lianjun and Zhang Miaomiao hesitated before getting into the car: "In this case, we

don't have to go, right?" Wang Chaoyang said: "Uncle Zhang, you don't have to go, but Miao Miao has to follow me, and she can help on the way."

Zhang Lianjun immediately nodded and said, "That's good." Miao'er, if you go with Chaoyang, I won't go.

Zhang Miaomiao, as an engineer, was very curious about what Wang Chaoyang and Zong Shiguo were discussing on the road, and Wang Chaoyang said that he needed her help, so he no longer hesitated and entered the carriage.

Zong Shiguo's car is a jeep, the comfort is poor, but the back row is very spacious, Zong Shiguo sits in the innermost, Wang Chaoyang and Zhang Miaomiao sit down in turn.

The assistant started the engine, and the jeep set out on its way to the province.

In the back row, Zong Shiguo opened the document bag, and inside was a thick stack of plan documents. Wang Chaoyang took the document, glanced at the table of contents, and turned directly back to the chapter on design calculation. Design calculations occupy more than half of the plan document, and after Wang Chaoyang opened the first page, he stopped talking, and his eyes became extremely focused.

At the beginning of getting on the bus, Zong Shiguo planned to briefly introduce the design calculation, but now seeing that Wang Chaoyang was so focused, he did not bother and waited patiently.

Zhang Miaomiao leaned next to Wang Chaoyang, and planned to take a look at the design calculations, but the front could still be understood, but the more she looked at the back, the more difficult it became, often she only looked at the beginning, Wang Chaoyang had already turned to the next page, so that Zhang Miaomiao couldn't keep up at all, and in the end she simply dispelled the idea.

After reading the design calculation, Wang Chaoyang flipped to the end of the document, where was the material report of all the materials.

After reading the material report, half an hour had passed, and Wang Chaoyang spoke: "Elder Zong, if I guessed correctly, it is the engine itself that limits the maximum transmission power of the system, right?" Zong

Shiguo stared at him and said, "You continue."

Wang Chaoyang said: "In the design calculation, according to the 12 kilowatt check, there is no problem with all the mechanisms, of which the redundancy coefficient of the gearbox is 5.5, the redundancy coefficient of the shaft system is 9.8, the redundancy coefficient of the actuator is 12.2, and the redundancy coefficient of the engine is only 3.2. According to the bucket principle, it should be the engine that limits the maximum transmission power of the entire system.

Zong Shiguo nodded and said, "What you said is completely correct!But do you know why the redundancy coefficient of the engine is only 3.2?"

"Fatigue life."

Wang Chaoyang flipped the document back to the design calculation position and said: "The reason should be the life calculation result here, according to the calculation of one million cycles, calculated at 12 kilowatts, the life of the crankshaft is just qualified."

Zong Shiguo poked his finger on the paper and said, "That's right, the problem is the life of the crankshaft. This crankshaft was made of No. 45 steel, and there was no problem in the strength and hardness calculation, but it could not be met in the fatigue calculation, and finally had to use 12 kilowatts for the calculation. Hey, this small crankshaft is the crux of the whole system!" Wang

Chaoyang said: "Have you ever considered adjusting the hardness to improve the life?"

Zong Shiguo shook his head and said, "I have considered it." However, the hardness of the shaft is set at 55 Shore Water, and with quenching, it is already the limit of 45 steel, and it cannot be improved.

Wang Chaoyang said: "No." I don't mean to increase the stiffness of the shaft, but to adjust the stiffness of the sleeve on the shaft. Zong

Shiguo

: "The hardness of the sleeve?" Wang Chaoyang said: "The shaft and the sleeve are matched, if the hardness of the shaft cannot be improved, then you can try to reduce the hardness of the sleeve."

"The hardness of the sleeve does not affect the life of the shaft...... Wait a minute, do you mean to say......" Zong Shiguo's eyes widened, and he froze for an instant.

After pondering for a moment, Zong Shiguo took back the information in Wang Chaoyang's hand, stared at it for a moment, and suddenly shouted: "Why didn't I think of it, oh, I'm so stupid...... The redundancy coefficient of the sleeve is more than 20, which is far greater than the design requirements, and the hardness of the sleeve can be reduced, and the wear of the shaft can be improved, so that the life of the shaft can be improved without affecting the use of the sleeve...... This idea is really wonderful, hey Chaoyang, how did you come up with such a wonderful idea!

""The shaft and the shaft sleeve are matched, one soft and one hard, the soft one can't be adjusted, so adjust the hard one, this idea is not difficult, right?" Wang Chaoyang smiled faintly.

In fact, Wang Chaoyang knows that this idea is not so simple as it sounds, and this is a new concept for redundant design that was developed in later generations.

In the case of a system, for example, the idea is to minimize costs by allowing all parts of the system to fail simultaneously at the end of their useful life as much as possible.

In the eighties, the domestic mechanical design, the safety factor was generally high, resulting in the appearance of the product appeared "stupid and coarse", and later with the improvement of the design concept, this status quo was slowly improved.

"Starting with the stiffness of the sleeve will definitely improve the life of the crankshaft and thus the maximum transmission power...... I have a hunch that maybe our system can reach 14 kilowatts!" Zong Shiguo said excitedly.

"Engineers don't trust hunches, they only trust calculations. Wang Chaoyang smiled.

"So it's a pity! I really hope that it will be counted now and see what the result is!"

"Let Zhang Miaomiao calculate, her calculation ability is very strong!" Wang Chaoyang said.

"Oh, hehe, this is the purpose of you insisting on bringing Xiao Zhang, I thought you two couldn't live without it!" Zong Shiguo laughed.

"Sect Elder, what are you talking about!" Zhang

Miaomiao's face turned red, why is it a small mouthful! "I apologize! Haha, I didn't open the door when I was so happy! Comrade Xiao Zhang, don't be angry, these calculations still depend on you!" Zong

Shiguo slapped his mouth twice, then took out paper and pen, and handed them to Zhang Miaomiao with both hands.