-Model number
Through subjective consciousness, with the help of entity or virtual representation, it constitutes an object that objectively expounds the morphological structure (object is not equal to object, not limited to entity and virtual, plane and three-dimensional). Model ≠ Commodity. Any object is a model in the process of research and development before it is defined as a commodity. When the model and specifications are defined and matched with the corresponding price, the model will be presented as a commodity.
Broadly speaking, if one thing can change with another thing, then this thing is a model of another thing. The function of the model is to express the attributes of different concepts. A concept can change many models in different degrees, but only a few models can express the nature of a concept.
Therefore, a concept can change the expression of attributes by referring to different models. When the model is associated with things, it will produce a framework with attributes, which determines how the model changes with things.
The form of the model is divided into solid model (physical form concept entity object with volume and weight) and virtual model (physical form composed of digital expression and other effectively expressed electronic data). Model display forms are divided into plane display and three-dimensional display.
From the form of expression, it can be divided into static model (a dynamic system that is relatively static in physics and does not have energy conversion itself, and does not show the integrity of structure and form under the action of external force) and power-assisted model (on the basis of static model, with the help of external kinetic energy, without changing its own performance structure,
A structural connection of an object detected by physical motion) and a dynamic model (which can generate kinetic energy through energy conversion, has a power conversion system in its own structure, and shows a relatively continuous form of physical motion during energy conversion). Virtual models are divided into virtual static models, virtual dynamic models and virtual fantasy models.
Mathematical model is a model described by mathematical language. The mathematical model can be one or a group of algebraic equations, differential equations, difference equations, integral equations or statistical equations, or some appropriate combination of them. Through these equations, the interrelation or causality between system variables can be described quantitatively or qualitatively.
In addition to the mathematical models described by equations, there are also models described by other mathematical tools, such as algebra, geometry, topology, mathematical logic and so on. It should be pointed out that the mathematical model describes the behavior and characteristics of the system, not the actual structure of the system.