Director Wang is the authority on the hydraulic pipeline, although it is the hydraulic pipeline of the operating system, but the pipeline of the engine must also be figured out, Qin Feng did not say that there should be any specific reason, just that the oil pipe burst, what may have caused it.

Director Wang thought about it seriously and said, "Either the quality of the pipe is not good, or the pressure of the hydraulic oil is too high, what else can there be?" ”

It's really not easy to find this reason.

"Is there really none?" Qin Feng asked.

"Yes, it is vibration, if the vibration is too large, it can also be broken, but the vibration also occurs when we are flying at a low altitude and high speed, how can this plane be too vibrated when it is tested on the ground."

This time it was Mr. Gu who spoke, and Mr. Gu's thinking had begun to diverge.

Last year's low-altitude and high-speed test flight was quite dangerous, and the entire plane could be dispersed at any time, and naturally, the fighter's oil pipes could also be dispersed.

But now, just interviewing and flying, it's also unlikely.

And Mr. Gu's words also reminded Qin Feng: "Mr. Gu, when you say that, I think of a story." ”

"At the beginning of the 19th century, a group of Napoleonic soldiers, under the command of their commander, marched majesticly and uniformly through a bridge in the French city of Angers. When they were about to reach the middle of the bridge, the bridge suddenly shook violently and finally broke and collapsed, causing many officers and soldiers and citizens to fall into the water and die. ”

In fact, the soldiers walked in unison and stepped on the bridge, which has happened in various countries, even in China, it is said that after the liberation, the Luding Bridge was also trampled on during the soldiers' training.

As a professional, after analysis, it is a very simple physical knowledge, which is resonance.

When the soldiers of the brigade walked in unison, a frequency was generated that coincided with the natural frequency of the bridge, which strengthened the vibration of the bridge, and when its amplitude reached its maximum until it exceeded the pressure resistance of the bridge, the bridge broke.

Every object has its own natural frequency, and if the frequency applied by the outside world is the same as its natural frequency, it will produce a very strong resonance.

Now, when Qin Feng said this, Mr. Gu was nodding, and when he said it just now, Mr. Gu had actually thought of it immediately, but in order to cultivate newcomers, Mr. Gu still asked Qin Feng to say it.

This reason is too bizarre, right?

Resonance, as we all know, this kind of physical knowledge belongs to a common sense that people who are engaged in technology know, but it is too coincidental to say that this accident was caused by resonance, right?

Many of the people present opened their mouths wide, is this possible?

"Let's experiment once, won't we?" Qin Feng said: "It shouldn't be difficult to do this resonance experiment, right?" ”

"What resonance, though?" Someone else said.

The engine is rotating, it must also be vibrating, is it the vibration of the engine, which is consistent with the natural frequency of the hydraulic pump?

In that case, it should be the hydraulic pump, not the oil pipe, that will be damaged. Everyone does resonance experiments, whose resonance experiments do they?

"Since it is a rupture of the oil pipe, it must be the resonance of the oil pipe, and the inside of the oil pipe, the transportation of lubricating oil, should also have a frequency, right?"

Qin Feng said very clearly, now, with the communication with Mr. Gu and the others, Qin Feng has guessed this greatest possibility.

Hydraulic oil pump, transport hydraulic oil, that is not a peaceful transport, but a once, piston every compression, will be transported, in this way, the fuel is transported in the oil pipe, naturally formed a frequency of oil delivery.

When Qin Feng said this, the people present were already pondering, this was really a possible situation, although it was a coincidence, and it was incredible, but if this was the case, the oil pipe could really explode.

"Let's go experiment." In Mr. Gu's hand, he picked up the hydraulic oil pump and walked towards the workshop.

Now, it is already afternoon, and when it is time to get off work, everyone is gathered together, and on the test bench, the fuel pump is installed.

"Start!" Mr. Gu shouted, and with his shouting, the system was activated, and the fuel pump was driven, faster and faster.

"Accelerate to a slow state, 800 rpm." Mr. Gu continued to give orders.

The fuel pump sped up, and at this time, everyone saw that this ordinary hydraulic oil pipe began to vibrate incredibly, more and more violently, more and more violently.

"Bang." With a crisp sound, the oil pipe of the hydraulic oil really burst again, and inside the oil pipe that exploded, the orange-red hydraulic oil flew out and splashed everywhere.

Sure enough, it was resonance, and now, everyone could see it clearly, because the natural frequency of the oil pipe itself was the same as the pulsating frequency of the oil pump, resulting in a huge resonance.

This failure is simply incredible, and if this experiment had not been done, everyone would never have dreamed of it.

Perhaps, everyone will change to other oil pumps, and the fault will no longer occur, but the cause of this failure may never be found, and it can only be ruled by accident.

Now, looking at the broken oil pipe, everyone's hearts have a different taste.

"When we build airplanes, we must act in accordance with scientific laws, and we must not take any shortcuts." Mr. Gu said: "We not only have to do static tests, but also resonance tests, this time, one of our fighters was burned down, the loss is huge, and the lesson is profound!" ”

It is indeed quite a dereliction of duty to cause the entire plane to be burned because of a problem with the oil pump, but who is to blame for this? Blame the manufacturer of the oil pump?

It's really not weird.

Do you blame yourself?

I have done my duty, and this accident should be regarded as a lesson that I will never forget.

The cause of the accident is found, and then it will be easy to do, just change an oil pump, after this change, you must first do a resonance test to verify that there is no problem before you can install the machine.

However, I am afraid that it will take more than half a year to reassemble an airplane, and all kinds of equipment will have to be re-produced, and it was originally hoped that this kind of aircraft will be able to be tested this year and equip the troops as soon as possible, but now it seems that it will have to be delayed until next year.

"Because of an oil pump, we lost half a year." Mr. Gu looked at the test bench with a silent expression on his face.

According to the assumption, the current J-8I has completed production, and after the test flight, it will be finalized and equipped with troops, because everything else is mature, so the main test flight weapon system, after the test flight is completed, the J-8 produced now will also be improved according to this new aircraft, and now, the progress has been delayed.

"Let's go, Qin Feng, tonight, we have to have a few drinks." Mr. Gu said to Qin Feng.