Meng Jianye's suspicion is justified, no matter how the parameters of the cruise ship are changed and how the test data is improved, there are two indicators that Meng Jianye has always insisted on, that is, shock absorption and noise reduction.

Especially the biggest source of vibration and noise of the hull, the marine engine, Meng Jianye has made a lot of efforts, especially after getting the batch of marine special rubber, Meng Jianye directly pushed down the previous steel spring shock absorber, and redesigned a series double-layer shock absorber with more efficient shock absorption function.

The name sounds quite tall, but the structure is actually very simple, which is to use four pieces of 60cm*80cmm marine special rubber, two by two, at a 45-degree angle relatively fixed on the metal frame, and then connect the two groups of frames to form a series double-layer shock absorber with marine special rubber as the main stress support surface.

The structure of the series double-layer shock absorber is simple, but the role is not small, due to the use of double-layer series structure, the series double-layer shock absorber has a better frequency absorption effect than other shock absorbers, so it can resist compression and reduction at the same time, unlike other shock absorbers, which need to add a limiter to have the same effect.

Based on this, the integrated marine engine will have greater elastic redundancy and relatively small system self-vibration, so as to reduce vibration and noise emissions.

It is precisely because of the good effect of this shock absorber and the simplicity of manufacture that it is widely used, and several of them are the standard configuration of several mainstream ships at home and abroad.

In his previous life, when Meng Jianye visited China and abroad, he had seen it more than once, and even personally watched the production process when he was a representative of the shipyard army.

Although the shock absorbers were much more advanced in materials and processes than they are today, the basic structure remained the same.

Therefore, Meng Jianye thinks that no matter how bad it is, it will not be like now, like the engine is naked ~~~ running, and it is so shocking that it makes people jump to their feet.

……

Sun Hongjie and Zhen Jia, the two technical backbones responsible for the shock absorber, are even more puzzled than Meng Jianye, the shock absorber is made in accordance with Meng Jianye's requirements, and has been tested on the dredging boat, and the results obtained are naturally unimaginable.

It was then installed under two 240 horsepower engines used on the cruise ship for a 100-hour test of the power and propulsion system.

As a result, before 48 hours, Liang Mingqiu and Niu Chen were in charge of the transmission and propeller to be fine, but the engines of the two of them began to go crazy with the wild horse, until they finally let themselves go completely.

Seeing that the two marine diesel engines were about to shake the test plant, they quickly turned off the engines, and several people hurriedly checked them separately.

As a result, Sun Hongjie and Zhen Jia's faces were black at that time, installed in six groups of two 240 horsepower engines, twelve series double-layer shock absorbers, eight rubber stress blocks were cracked, and the shock absorption effect was completely lost.

"How so, how can this be......"

Holding a flashlight and looking at the cracked rubber blocks, Sun Hongjie's emaciated face could no longer find a look of indifference, but looked at the cracks on it with an incredible face, and his whole mind was blank.

Zhen Jia is a little better than Sun Hongjie, but his face is also very ugly, squatting in the corner and smoking a cigarette, Liang Mingqiu and Niu Chen are much better than the two of them.

The propulsion system they were responsible for was simplified by Ren Xia, and it changed from a high-standard large-tilting three-bladed propeller to a decent flat four-bladed propeller.

With the batch of propeller special equipment obtained from the excellent factory and Liang Mingqiu's superb casting and machining technology, the manufacturing process of the cruise ship propeller was completed in less than half a month, and the final shape and installation could be completed after only 100 hours of durability test.

But before the durability test was done halfway, there was a problem with the shock absorber of the engine, which made Liang Mingqiu and Niu Chen speechless and even more helpless, so they could only patiently help the two brothers find out the reason.

But after all, the two of them did not participate in the research of the shock absorption system, and they couldn't find any reason for it just by that little fur, so they could only hold the removed shock absorber and do it in a hurry.

"Could it be that you made a mistake?"

In the end, it was Niu Chen who opened his mouth to break the silence, but Rao was like this, Niu Chen did not have a big mouth as usual, but became rarely subtle, no way, now Sun Hongjie and Zhen Jia are really broken glass, and they can't stand the stimulation at all.

It's just that Niu Chen has already been careful, and his words still touched Sun Hongjie's already sensitive nerves, when even Jin shook his head: "Impossible, this is all my father's piece by piece, one by one, I personally figured it out, look at the flatness of the fracture and the corner, the whole factory can't find such a regular sheet metal piece." ”

Hearing this, Liang Mingqiu looked at the shock absorber on the console again, not to mention, the metal parts on it are indeed finely processed, and even the fractures are polished very smooth, which shows that the craftsmanship of the processing person is quite good.

Niu Chen has nothing to say, Master Sun's craftsmanship is admired in his heart, there has been no problem with the things he has started for so many years, but the shock absorber in front of him is indeed broken, Niu Chen's head is directly messy, his mouth is open and closed for a long time, and finally he can only reluctantly suggest: "It's really not good...... You look for a small industry, maybe ...... He has a way!"

"Don't look for it, let's solve it ourselves!"

Before Niu Chen's words fell, Zhen Jia, who was squatting in the corner and smoking, walked over at some point, and before he finished speaking, it was like holding the shock absorber on the operating table and leaving, but before he could make a move, a fiery voice came from behind him: "How to solve it so-so?"

"Xiaoye, I ......"

"Don't talk nonsense, I'm talking about you, Sun Hongjie! I haven't said anything about the precautions for the processing of tandem double-layer shock absorbers?

Seeing that the person who came was Meng Jianye, Sun Hongjie wanted to defend himself, but as soon as his words came out, he was choked by Meng Jianye's two sentences.

Even Zhen Jia, who was about to move the shock absorber, was blue and white for a while, and the changes were very exciting.

Liang Mingqiu and Zhen Jia are not fools, as soon as they see this scene, they know that Sun Hongjie and Zhen Jia took Meng Jianye's words as a deaf ear and made modifications during processing, which led to today's failure.

In fact, it is true that the structure of the series double-layer shock absorber is simple, but in the processing, it is necessary to pay attention to the material properties of the fixed rubber block, that is, it can not be damaged at the same time, but also to leave the redundancy when the rubber is extruded and expanded, which requires that the fixed metal parts can not appear square right-angle sharp edge to bind the rubber block too tightly.