Automotive profile design is divided into A, B, C3. The A-level requirements are the highest, and the imaging assessment cannot be varied. For the body, it is generally referring to the external table visible and interior visible, such as the top cover, the hood outer plate, the wing plate, the bumper and the interior panel, etc. part. B-grade refers to a large-scale imperfect part of the floor. C gravity is mainly structural support, such as a bracket. "Two basic views of the type of the type involving the surface involving the surface are position and quality.
Location - All consumer visible surfaces are considered by A-SURFACE. The CONSOLE (sub-duty station) of the car belongs to the A-SURF, and the internal structure is B-SURF. Quality - related to surface topology, position, tangent, curvature of curvature and PATCH structure inside the curved surface.
Some opinions believe that "point continuous" is Class C, the tangent is continuous, Class B, and the curvature is continuous. I want to be more appropriately defined as C0, C1 and C2, corresponding to the B-spline curve equation and its 1-step priority (tangent = C1) and its 2-step number (curvature = C2).
So a A-Surf may be a curvature discontinuous. If it is the intention of the design, it is possible to cut the cut line, if the design is a fold or sharp edge, (and usually injection or stamping can not have sharp edges, Therefore, A-SUUF must be a tangent continuous (C1)).
The second idea is based on the experience of automotive companies and white car manufacturing, making a deeper understanding of A-Surf. They made the same definition according to independent classification.
Physical definition: A-SURF is a curvature of the curvature in the respective boundaries. The curvature continuously means that there is the same curvature radius along the boundary in any "point" on any surface. Surface is quite difficult to do this
The cutting continuous is only a continuous direction without a radius, such as chamfering.
Point continuously only guarantees that there is no gap, completely contact.
In fact, cut continuous points can meet most of the basic industries (aviation and aerospace, shipbuilding, biw, etc.). Based on these applications, there is usually a continuous need for curvature.
Definitions: A-SURF is a surface that has a specific physical meaning visible in the product.
A-Surf is first used for automobiles and increasing in consumer products (toothbrush, Palm, mobile phone, cleaner, sanitary equipment, etc.).
It is also aesthetic needs.
* Point continuously (also known as G0 continuous) produces a reflection on each surface, and the reflection is intermittent distribution.
* The tangent continuous (also known as G1 continuous) will produce a complete surface reflection, reflecting but twisted.
* Curvature continuous (also known as G2 continuous, Alias can do G3!) Will produce complete and smooth reflection of all boundaries. In the real world, the curvature is continuous, and it is the main melody.
There is such a classification method in the old automotive industry: A surface, body outer surface, white car; B, unimportant surface, such as an interior surface; C surface, invisible surface. This is actually the foundation of the A-level surface. But now as aesthetic and comfort is increasing, the auto interior parts also refer to the requirements of A-Class. Therefore, the classification is simplified, A, visible (even touchable) surface; B, visible surface. This is history and is the origin. Tell the status quo. Ask others what is the form of the A-level surface, usually hear the first sentence is "A, there is no exact definition, there is no clear standard, ..." This is true, but there is no ISO, no What is ANSI and DIN. However, all core companies have their own standards. A face standard belongs to the core technology of automobile companies, very confidential. Reflected is a corporate design level and style. For example, GM, standard American style - rough, GM's A-face standard requires a relatively low in the automotive industry. The requirements of the corresponding European and Japanese big plants are relatively high. There is also a professional design company and accessory module supplier's A-plane standard belongs to high. For example, the interior king Visteon and Lear have a very strict A-plane standard Class A surface without very strict mathematical descriptions. There is no very strict concept definition. 1. General Class A's order and control points are not much, the UV direction is approximately 6 ~ 8 control points 2, and a single Class A surface guarantees the continuity of the curvature of the curvature in the UV direction. 3, CLASS The connection between the A surface satisfies the tangential continuous 4, using a variety of mathematical test methods to verify the Class A surface, and should not appear. (If you use a high-light contour line to test, the contiguous and excessive uniform clearance is evenly uniform.
