The large-scale promotion of CAD technology will not gradually become popular until the end of the eighties when the hardware cost drops sharply, and the platform cost drops from more than 200,000 dollars to tens of thousands of dollars. Pen ~ fun ~ pavilion www.biquge.info

The development of CAD technology in China will not be until after the nineties.

In 1991, Academician Song Jian, then a well-known expert in cybernetics, systems engineering and aerospace technology in China, and then a state councilor (and later served as the president of the Chinese Academy of Engineering), put forward the call of "getting rid of the drawing board", and the Chinese government began to attach importance to the promotion of CAD technology, and contributed to a vigorous enterprise innovation in various fields of industry.

In 1992, Huaxia launched the "CAD Application Project" and included it in the top priority of the Ninth Five-Year Plan, which set off an upsurge of independent research and development of CAD software.

Subsequently, many domestic CAD companies sprung up, and Kaimu Company, a well-known PLM product and solution provider, was established in that year.

Although there are still more than ten years before that innovation, Yang Weining is confident that as long as he has his own intervention, CAD technology can bloom in the field of aviation industry in advance.

As for whether he can independently develop a CAD software, Yang Weining has no doubts.

In his previous life, Yang Weining was not just a special test pilot of the Air Force, before joining the army, he was already one of the founders of the Red Guest team, and he had profound attainments in the fields of encryption and decryption, program writing, etc.

After becoming a test pilot, as a representative of the military, he personally participated in the testing of CAD software specially built by Kaimu for aviation systems.

There is probably no one in this world who has such a deep and clear understanding of the future of CAD technology as he does.

From the early 70's to the maturity of later generations, CAD technology has undergone a total of four technological revolutions.

The first revolution in CAD technology was the Surface Modeling System (CATIA) developed by the French on the basis of Bessel's algorithm.

The technological innovation brought about by the curved molding system has had an important impact not only in the aerospace industry, but also in the automotive industry.

It has made a qualitative leap forward in the means of automobile development compared with the old model, and the development speed of new models has also been greatly improved, and the development cycle of many models has been shortened from the original six years to only about three years.

Such significant benefits have led to the rapid popularization of the technology.

By the mid-eighties, almost all of the world's automotive and aerospace companies had purchased a significant amount of CATIA, and as a result, CATIA had risen to the top of the list of CAD software for the manufacturing industry, and remained so for many years.

The second CAD revolution is solid modeling technology.

In the early 80s, in the context of the Star Wars program at that time, the American company SDRC, with the support and cooperation of NASA, developed a number of special analysis modules to reduce the huge cost of space experiments.

Because the surface model technology can only express the surface information of the shape, it is difficult to accurately express other characteristics of the part, such as mass, center of gravity, moment of inertia, etc., which is very unfavorable to CAE (computer-aided engineering).

Based on the exploration of the development of CAD/CAE integration technology, SDRC released the world's first large-scale CAD/CAE software based on solid modeling technology, I-DEAS.

But in doing so, a very fatal problem arises.

Because the solid modeling technology can accurately express all the properties of the part, it theoretically helps to unify the model expression of CAD, CAE, CAM, which brings amazing convenience to the design, but also brings the extreme expansion of the amount of data calculation.

Under the hardware conditions at that time, ordinary computer platforms could not support the amount of computing required by solid modeling technology.

In addition, CAE based on the premise of physical models is a high-level technology, and the popularity is narrow, and only high-end fields such as aerospace have strong demand, so this technology has been silent for ten years.

It wasn't until the end of the 80s that CV was the first to make a breakthrough in algorithms, which made solid modeling technology popular.

The third CAD revolution is parametric technology

The main characteristics of parametric technology are: feature-based, full-scale constraints, full data correlation, and size-driven design modification, which can bring great convenience to designers.

This program is suitable for small and medium-sized business owners in the low- and middle-end manufacturing sector.

Since they didn't have a lot of work to do, the shape of the parts was not complicated, and more importantly, they couldn't afford to invest in large, high-end software, so it was natural for them to look to low-to-mid CAD software with parametric design.

In the nineties, parametric technology became more mature, fully reflecting its advantages in the simplicity and ease of design of many general parts and components.

The successful application of parametric technology has made it almost the standard in the CAD industry around 90 years ago.

However, parametric technology also has many shortcomings. First of all, the rigid rule of full-size constraints interferes with and restricts the creativity and imagination of designers.

Full-scale constraints, that is, designers must consider the shape and size together in the early stage and the whole process of design, control the shape through the size constraints, and drive the change of the shape through the change of size, all with the size (that is, the so-called parameters) as the starting point.

Once the shape of the part is too complex, it is not intuitive to change the size of the full screen to achieve the desired shape.

In addition, if the topological relationships of key bodies are changed during the design, the loss of certain constraints in the geometric features can also cause confusion in the system data.

Therefore, later generations of CAD software developers based on parametric technology proposed a more advanced solid modeling technology than parametric technology - variable technology.

The variable technology not only maintains the original advantages of the parametric technology, but also overcomes many of its disadvantages.

Its successful application provides greater space and opportunities for the development of CAD technology.

Taking history as a mirror, we can know the rise and fall.

Every major progress in the basic theory of CAD technology has led to the improvement of the overall technology of CAD/CAM/CAE and the update of manufacturing methods.

Technological development never ends.

No technology is evergreen, and CAD technology has been constantly developing and exploring.

It is this kind of interaction and alternation that has created the prosperity and prosperity of CAD technology in later generations and promoted the rapid development of industry.

For Yang Weining, CAD technology is just a trivial technology tree in his mind, and it is easy to light up this technology tree, but the problem is that Yang Weining does not want to simply repeat the work of CADAM and CATIA.

How to integrate some design ideas of CAD software in later generations as much as possible under the existing hardware conditions is what Yang Weining needs to think about.