One of the basic quality tests of the project and the implementation of the construction of a table is to determine its stability. The basic static scheme here is loading the table worktop with a vertical force with the value of 600 N at a distance of 50 mm from the front edge of the […]
Category: The History of Furniture Construction
Mixed Methods of Optimisation
Mixed methods of optimisation are combination of random methods and deterministic methods. Below, we will discuss one of them, the complex method. This method assumes that in an N-dimensional area R, at least one starting point is known. We will divide the restrictions of the R area into two groups: • functional restrictions: Ui(xn, P […]
Random Walk Method
Random walk method (Fig. 6.105) is based on the claim that the optimum point is most often located on the edge of the permissible area Ф. The size of the cell T =10 mm, the length of the favourable series to = 100 and the length of the unfavourable series po = 100 were assumed […]
Monte Carlo Method
Construction parameters selected by the manufacturer as a result of using optimisation must meet the basic criterion, which in this case is the minimum area of cross section of rails. And the given optimum dimensions must meet numerous additional restricting conditions. For example, let us consider the construction of an external wing of a reinforced […]
Systematic Search Method
Let us assume that the subject of optimisation is a chair with a bar, whose side frame construction is shown in Fig. 6.94. The cost of manufacturing is considered a natural optimisation criterion. This often leads to adopting the dimensions of cross sections of the construction components as the function of purpose. Achieving the optimal […]
Random Methods of Optimisation
Rapid progress in the field of data processing and electronic calculation means creating not only new numerical methods of designing constructions, but also methods for assessing the strength of the products already made and subject to validation. In order to develop reasonable methods of constructing furniture, fulfilling the function of purpose to minimise the consumption […]
Deterministic Methods of Optimisation
Using this method, one looks for the optimum in the sense of the function extreme by its differentiation. This method leads to the exact determination of the global extreme and all local extremes, which can be treated as the solution of the task if it is located in the area of permissible decisions and if […]
Mathematical Model of Optimisation
Each construction is described explicitly by the parameters of shape, type of material, exchange, stress, deformation, load, functionality, colour, etc. If any of these features can be attributed to a certain value, then the whole construction can bedescribed by a set of n numbers, where n is a number of characteristics that describe the proposed […]
Optimisation of Skeletal Furniture
6.2.5.1 Aspects of Optimisation The issues of strength analysis of furniture presented in the previous chapter are used for analysis or synthesis of interesting issues. In many cases, constructing furniture means creating a new whole from more or less known elements and joints. It is obvious that every subsequent decision made during designing should be […]
Stability of Chairs and Armchairs
Determining stability of side frames of skeletal furniture requires knowledge of values of both vertical load F and horizontal load H (Fig. 6.91). Value of the force F can be expressed in the form: and the value of the force H: where a width of the furniture base, e arm of acting of vertical force […]