The necessary condition for the above derivation is that the vibration system must work within the elastic range of the spring. Here, the role of the spring is the storage and release of energy, which is characterized by the spring stiffness k. The relationship between the load (force F or torque T) that the spring is subjected to and its deformation (displacement x or angle φ) in the elastic range. Hooke's law is satisfied, that is, the stiffness (k) of the spring is the ratio of the load increment (dF or dT) to its deformation (dx or dφ), ie k = dF / dx, k = dT / dφ. It can be seen that the genetic characteristic of the evolution process of spring products is the stiffness of the spring.
Considering that there is usually a certain mapping relationship between the input eigenvalues ​​and the output eigenvalues ​​describing the process of product gene action, the functional relationship between them can be used to represent the action process of the product genes. The product gene function in the spring product gene model is actually Hooke's law y=kx, whereby the product gene model of the spring is as shown. In the design of spring variant products, the spring product gene is the commonality of spring products that designers must grasp.
The product gene model of the spring 3TRIZ in the evolution of spring products The product gene model is the commonality of similar products. However, knowledge that only has a product genetic model is not enough. How to solve the contradiction in the process of product evolution design is a problem that designers must face. TRIZ theory can help designers find solutions. The following two springs are shown as examples to introduce the application of TRIZ theory in the evolution of two types of springs.
Coil spring and corresponding characteristic line f(t)km spring product gene model action process feature solving feature energy storage and release size and positive and negative Hooke's law y=kx constraint feature main feature elastic control in the elastic range (a) ( b) (c) (d) Fx cylindrical coil spring (shown in (a)) is simple in structure, easy to manufacture, and its characteristic line (force-displacement curve, shown in (c)) is close to a straight line, that is, the stiffness of the spring More stable. The conical coil spring shown in (b) has a gradually increasing stiffness and an increasing characteristic line (shown in (d)), which is advantageous for eliminating and mitigating resonance. Further, the conical coil spring has a similar structural shape to the cylindrical coil spring. The above-mentioned comparative performance is converted into the standard engineering parameters in the TRIZ theory: NO. 14 Intensity: refers to the ability of an object to resist changes caused by external forces; NO.35 Adaptability and versatility: the ability of an object or system to respond to external changes , or the ability to apply under different conditions.
According to the above analysis, the "strength" of the spring is an improvement in performance, and "adaptation and versatility" is a deteriorated performance. Therefore, combined with the conflict matrix for solving problems in TRIZ theory, the corresponding invention principles are selected as NO.15, NO.3, NO.32<5>, which are described as follows: NO.15 invention principle is "dynamic", It is explained as follows: (1) an object or its automatic adjustment at each stage of operation to achieve optimized performance; (2) dividing an object into interrelated elements, the relative position between the elements can be changed; (3) If an object is stationary, make it motion-controlled or changeable.
The principle of invention of NO.3 is “local qualityâ€, which is explained as follows: (1) changing the uniform structure of an object or environment into an uneven structure; (2) making different parts of the constituent objects perform different functions; (3) making the composition Every part of the object works to its fullest extent.
The principle of invention of NO.32 is "change color", which is explained as follows: (1) changing the color of an object or environment; (2) changing the transparency of an object, or changing the visibility of a process; (3) using color Additives that make objects or processes that are not easily observed observed; (4) If the color additive is added, the trajectory of the luminescence is used.
As can be seen from the above inventive principle, the "interpretation 1" in the principle of the invention of NO. 15 and the "interpretation 1" in the principle of the invention of NO. 3 can be used in the evolution of the two types of springs: it will be completely uniform. The cylindrical structure becomes a relatively uniform conical structure, so that the stiffness during the deformation process of the spring has "dynamic performance". When the deformation is small, the spring stiffness is small; when the deformation is large, the stiffness of the spring is large.
Conclusion Product gene theory and TRIZ theory are two different modern design theories. Product gene theory focuses on abstracting the essential elements of products from existing products. In the development of new varieties of similar products, the essential elements make the product development process. The goal is clear; although the TRIZ theory also has research corresponding to products, it pays more attention to dealing with physical conflicts and technical conflicts in the product development process.
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