Yang Fan looked puzzled.

Noting Yang Fan's expression, Chen Shaohua's heart sank slightly, and he couldn't help asking, "What's wrong, is there any problem?"

Yang Fan didn't say anything, seemed to be thinking.

A technician next to him said: "We measured the axis system deviation in three temperature environments, and there was almost no change. We speculated that the axis system deviation was almost not affected by temperature changes, or the change was very small, which was much smaller than Director Yang speculated."

What!

Almost unaffected by temperature changes???

Chen Shaohua's heart sank again, and he even thought to himself, would Yang Fan's inference be wrong? No, no...

He kept comforting himself in his heart, believing that Yang Fan's inference would not go wrong.

Zheng Xianxue also thought that there would be no mistake and scolded the technician just now and said, "Don't talk nonsense, how could Director Yang make a mistake?"

Yang Fan smiled and said without any mind: "I am not a god, and I may make mistakes, but I should not be wrong this time."

After saying that, he continued: "It's 29 degrees now, measure it again, no, measure the axis shift value three times at the same temperature."

This is mainly to reduce measurement errors.

The value of the axis system offset is extremely small, and the process requirement is that the offset value is within 0.05 mm. Yang Fan looked at it and the values ​​measured by several technicians under three temperature environments were either 0.039 mm or 0.040 mm, which was only one thousandth.

Such a small difference can be considered as a measurement error, not necessarily a temperature influence. In order to make the measurement more accurate and reduce the measurement error, it is necessary to measure it several times.

Zheng Xianxue immediately waved his hand and ordered: "Click as Director Yang said, measure it at least three times in each temperature environment."

These technicians took action again to measure the axis shift of the power system, and the results came out soon.

A technician looked surprised, "Sure enough, there is a measurement error. The value we measured just now was 0.040 mm, and this time it was 0.041 mm."

We continued to measure it again, and it was measured twice, once at 0.040, and once at 0.041. In total, three measurements were measured twice at 0.041 mm.

Continue to measure again, it is still 0.041 mm.

Zheng Xianxue judged: "Under the temperature environment of 29 degrees, the axis system offset is 0.041 mm, not 0.040 mm, indicating that the axis system offset has changed by two thousandths from the degree."

Yang Fan thought so, and nodded in agreement.

Upon hearing this, Chen Shaohua felt a little relieved, and his originally serious expression suddenly became much more relaxed.

Will the temperature change really affect the axis system deviation? Yang Fan, Chen Shaohua and Zheng Xianxue did not leave the power cabin and stayed here and waited.

After about half an hour, the temperature dropped to 28 degrees.

After measuring three times at this temperature, all measured values ​​were 0.043 mm, and the axis shift was two thousandths higher than the temperature environment of 29 degrees.

Yang Fan became more and more sure that the temperature will really affect the deviation of the shaft system, and the impact is relatively large. If the failure of two consecutive test runs is likely to be really affected by the temperature changes.

The originally adjusted axis system deviation is qualified at a certain temperature, but as the temperature changes, the originally qualified axis system deviation value exceeds the qualified range, and the originally qualified one becomes unqualified.

Yang Fan, Chen Shaohua, and Zheng Xianxue did not go back until the second half of the night.

The temperature in the power chamber also dropped to 25 degrees, and the measured shaft system offset value has reached 0.061 mm, completely exceeding the qualified range.

The monitoring is still going on, but Yang Fan and others do not need to continue to squat here. Technical and quality personnel are responsible for measuring the axis system offset value three times under each temperature environment and recording it.

Yang Fan believes that such monitoring will take at least 24 hours, and it is best to monitor two round trips, which is 48 hours.

Zheng Xianxue suggested that the axis system offset value should be monitored simply under each temperature change within 48 hours, and Chen Shaohua agreed.

So, I settled down like this.

Yang Fan doesn’t have to worry about future monitoring, just wait and see the results. When you return to the guesthouse of Donghai Institute, you will fall asleep in the end, and you will sleep very sweetly and safely.

I slept until 10 o'clock the next morning before getting up. After having breakfast in the guesthouse, Yang Fan went to the power cabin again and checked the monitoring results.

Sure enough, temperature changes have a great impact on the axis system offset. The maximum offset value has reached 0.065 mm. As the temperature increases, it reaches 38 degrees or even 40 degrees. It is hard to say whether there will be a larger offset value.

After watching it, Yang Fan temporarily returned to the East China Sea Institute.

As soon as I started work in the afternoon, less than ten minutes after sitting down in the office, Chief Secretary Pan called and called Yang Fan.

As soon as Yang Fan entered the door, Chief Commander Pan asked: "Xiao Yang, I heard that you stayed in the Donghai Shipyard for one night and just came back?"

"Yes." Yang Fan nodded, "We have found the reason for the failure of the two test runs, mainly because the axis system offset is greatly affected by temperature changes..."

A brief introduction to the situation.

Suddenly, Chief Commander Pan became happy and relieved!

"That's great!" Chief Secretary Pan's face showed a clear look of joy, which showed his inner joy. He said loudly: "The root of the problem has been found, and this problem can finally be solved!"

While happy, he praised: "Xiao Yang, you are really good. You have made another contribution to solve this big problem. I think even Commander Huang will be happy."

ah!

Yang Fan was slightly surprised. He did not expect that Commander-in-Chief Huang Keping was paying close attention to this matter. Then he suddenly realized that it was normal for Huang Keping to pay attention, after all, this was not a small problem.

The root cause of the problem has been found, what should I do next?

Yang Fan told his plan that after 48 hours of monitoring, there will be another 24 hours or 48 hours of shaft shift adjustment.

In the next 24 hours or 48 hours, the measurement axis system deviation will be unqualified and the adjustment will be made under this temperature environment.

If the temperature environment fails, adjust it in which temperature environment to ensure that the offset value of the shaft system in any temperature environment is qualified, all within the range of 0.05 mm.

After listening to Yang Fan's plan, Pan Jinfu nodded in agreement, "Yes, this method is good, simple and effective. I believe it can solve the problem of shaft system offset and it should ensure the success of the third test run."

He has confidence in this!

He is more confident in Yang Fan!

.........

Donghai Shipyard.

According to the method mentioned by Yang Fan, the 48-hour axial system offset value monitoring has been completed, and the temperature changes in the power chamber vary from degree to degree.

Each temperature environment has at least three measurements, and some temperature environments even have four or five measurements.

The axis system offset value also varies greatly from qualified to unqualified. The maximum axis system offset value reached 0.072, which is a serious unqualified.

Interior of the conference room.

Chen Shaohua, Xie Xinjian, and Zheng Xianxue were all sitting there, and they were some backbone and senior technicians of the Donghai Shipyard, as well as some production managers.

Yang Fan, Li Zhengjun, and several other technicians from the Donghai Institute also sat here to attend the meeting.

Zheng Xianxue introduced the monitoring situation within 48 hours to everyone, and each person sent a form that recorded the axis system offset value under each temperature environment.

His voice was very loud and there was a sense of ease, "Comrades, thanks to Director Yang Fan, the reason why we failed in the two consecutive test runs was found. Now it is certain that the temperature changes caused the change in the axis shift value."

"The next thing we have to do is troubleshoot and solve the problem that temperature affects the axis system offset value. In this regard, Director Yang is an expert, and now asks him to tell me what we should do next."

brush!

Almost all his eyes were on Yang Fan. At this moment, Yang Fan became the focus of the entire conference room.

These eyes are admirable, happy, and admirable!

Too awesome!

There are really two brushes!

I am worthy of being Director Yang!

It was Director Yang who helped us find the root of the problem!

Many technicians think this way in their minds. They are those old technicians who are in their forties and fifties who have been working in technical work for almost their whole lives. They also admire Yang Fan very much.

The meeting room was quiet.

In everyone's eyes, Yang Fan stood up and said loudly: "Next, I think I should do this. Then, in 48 hours, we measure the offset value of the shaft system under each temperature environment, and adjust it if we find that it is not qualified to ensure that the offset value of the shaft system is within the qualified range of 0.05 mm..."

Everyone listened carefully.

After listening, applause rang out in the conference room. This was an affirmation of Yang Fan's speech. Everyone agreed that this method was feasible.

Simple and effective!

Chen Shaohua made the decision in person, "Then let's follow Director Yang Fan's method."

So things settled.

Zheng Xianxue arranged personnel and divided the labor according to the method proposed by Yang Fan. After the meeting was dispersed, he immediately took action.

In the power chamber, there are always technical and quality personnel who are monitoring the offset value of the shaft system and making appropriate adjustments to ensure that the offset of the shaft system is qualified under any temperature environment.

Two days later.

Yang Fan came to the Donghai Shipyard again, and Chen Shaohua politely went to the Donghai Station and enthusiastically invited Yang Fan over.

"Director Yang, we have carefully adjusted the shaft system of the power system. It is qualified in any temperature environment and the offset value does not exceed 0.05 mm."

After saying that, he also handed a monitoring report to Yang Fan.

After taking the report and looking through it, Yang Fan said happily: "All the data are qualified, I think we can conduct the third test drive."

The third test run was exactly what Chen Shaohua hoped for.

The third test drive seemed natural, and it seemed like such a surprise!

Chen Shaohua looked at Yang Fan, and it took two or three seconds to react. Then, he said loudly: "You can really do the third test drive!"

.........

The third update will be continued today, and the first update will be given!

:.:
Chapter completed!