What Zhao Guoyang said was not only conceited, but even arrogant.
Don't talk about Mo Xiaotian, even Zhu Maotao felt a little incredible after hearing it.
Mo Xiaotian didn't laugh angrily and said: "Oh, Section Chief Zhao, although you have given me a good teaching, I Mo will listen to me." ” Zhao Guoyang said "um", pointed to the book and said unceremoniously: "First of all, I think it is very inappropriate for you to share this question with Researcher Zhao." ” "Your senior brother should know that she is just a first-year student now, and she doesn't know much about the performance of vehicles, and her thinking is very limited, so it is really difficult for her to try to solve this kind of problem."
After Zhao Guoyang finished speaking, Zhao Siyan looked at her teacher Zhu Maotao in surprise.
In fact, when Mo Xiaotian shared this topic with Zhao Siyan, Zhu Maotao also said something similar.
However, because of Zhao Siyan's proactive request, he finally reluctantly agreed.
But Professor Zhu also said first, only Zhao Siyan was allowed to try to conceive some ideas, and she was not allowed to get too deep, for fear that she would drill into the horns of the bull and finally get into it and not be able to climb out.
Zhao Guoyang didn't notice the strangeness of Zhao Siyan and Professor Zhu, and continued to say: "Brother Mo, your topic, to put it bluntly, is a kind of extension of NVH.
Put it in the specific case of the contrast between the capital jeep and the Matsue Santara" "NVH" Mo Xiaotian looked at Zhao Guoyang blankly, as if he had never heard of this term at all.
Jiang Hong, Liu Renhe, and Liu Yaohong are also you look at me, and I look at you, all of them are confused.
Only Wang Ziqing and Zhu Maotao looked at Zhao Guoyang's eyes with a fine light.
Especially Zhu Maotao, as if he had discovered a new continent, looked at Zhao Guoyang without blinking.
Seeing the blankness on Mo Xiaotian's face, Zhao Guoyang was stunned for a moment, and then came to his senses: "NVH", that is, the term "NVH", which only came out of Western countries at the end of the 80s, has not yet become popular in China.
Mo Xiaotian didn't know, and it wasn't a strange thing.
"The so-called NVH is the English abbreviation of noise, vibration, and harshness ation、harshness” "This is a comprehensive issue to measure the quality of automobile manufacturing, and it gives the most direct and superficial feeling to car users."
"According to the current development trend, the NVH problem of vehicles has become one of the concerns of major vehicle manufacturers and parts enterprises in the international automobile industry.
In the future, with the continuous improvement of people's requirements for car comfort, its importance will be even higher. ” Zhao Guoyang's expression was calm, and he explained like a river, as if he had returned to the past when he spoke at major seminars.
Presumably, researcher Mo should also know that to evaluate the performance of a car, there are usually various data indicators.
For example, the dynamics include the top speed, acceleration time and maximum climbing; Economy: 100 kilometers of fuel consumption, car maintenance costs, etc.
So how do you evaluate the comfort of a car?"
Zhao Guoyang saw Mo Xiaotian's stunned look, smiled and continued: "From the perspective of NVH, as long as the car can ensure that the impact of noise, vibration and impact environment on the occupants is within a certain limit during driving, so the comfort is mainly evaluated according to the subjective feelings of the occupants. ” "But herein lies the problem.
Due to the differences in the mental and physical qualities of each person, their sensitivity to NVH varies greatly. ” "This thing, to put it bluntly, is like aesthetics, and different people's views are very different.
Sometimes, the appearance of a car that you think is ok looks bad to another person, but it doesn't look good. ” "In addition to the differences in sensitivity of each person, we also have to take into account the differences between the different models.
For example, in a sports car, you have to hear the roar of the engine to have a sense of control; And off-road vehicles need to feel their strong sense of impact to be favored. ” "So for the NVH problem, there are different requirements for different models, which brings difficulties to the early design."
When Zhao Guoyang said this, everyone was already concentrated, and they didn't gasp, for fear of missing such a wonderful explanation.
Even Zhao Siyan, who had always looked at him unpleasantly, put her hands on her cheeks and stared at him with a pair of big watery eyes without blinking.
Zhao Guoyang opened the thermos cup, took a sip of water, moistened his throat and said: "Then, it's like this defense question, the topic is to analyze the performance difference between the Beijing Jeep and Songjiang Santana. ” "You listed this simulation optimization model, analyzed and compared the climbing ability of Beijing Jeep and Songjiang Santara, and compared the speed and comfort.
Is there anything wrong with this, yes, but it's not comprehensive, and it's hard to say if it's not objective. ” "For example, if you drive a Jeep in the capital city on flat land or on a highway, the comfort is definitely not as good as that of Santara, but if you drive it in the Gobi, the beach, or the mud, then it will definitely win."
"In this regard, there is no comparison between the two at all, so what's the point of your simulation model?"
Zhao Guoyang tapped on the desktop and said: "In fact, in the development process of a model, simulation optimization is indispensable.
To some extent, it can greatly reduce the cycle time of car development. ” "Taking the strength optimization of ordinary structures as an example, if we know that the strength is insufficient somewhere in the simulation results, then we can immediately think of ways to solve the problem by changing the material, adding stiffeners, and optimizing the structure.
This method can effectively and accurately improve the body structure, and the current consistency rate between simulation and measurement is quite high. ” "However, in terms of NVH, although it has a variety of simulations, vibration tests and vehicle vibration tests and a series of methods to test, it has never been able to get accurate and objective conclusions."
"Most of the time, the simulation results are far from the measured data, which makes it difficult to reduce costs and production cycles."
"Therefore, it seems to me that this subject of yours has been misdirected from the beginning" Zhao Guoyang's last words were like a thunderclap on the ground, and everyone present was shocked.
Zhu Maotao couldn't hold back his excitement and asked word by word: "Xiao Zhao, if you are here to defend, how are you going to do this subject?"
Zhao Guoyang just spoke up, and he didn't pay attention to the expressions of the group of people around him.
Hearing Professor Zhu's question at this time, he naturally couldn't slack off, so he quickly stood up and expressed his opinion.
"Professor Zhu, if I were to solve this problem, I would not build a simulation and control system, but work the after-sales of Songjiang Santara and Jingcheng Jeep."
"First of all, I will select a few common feedback from the after-sales feedback of these two cars.
Then, according to the solutions to these problems, a data comparison table is listed. ” "This table, there is a vertical contrast, there is a horizontal contrast.
Longitudinal comparison is the comparison of feedback information from the same model on the user's side before and after the problem is solved; Horizontal comparison, that is, two models, comparison of the handling of similar problems" Zhao Guoyang finally concluded: "After the results of these two comparisons come out, Professor Zhu, this problem is basically solved. ”: