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Elements of Designing Upholstered Furniture Sandwich Frames Using Finite Element Method
This paper presents an approach to the design of an upholstered furniture frame using the finite element method and empirical studies. Three-dimensional discrete models of upholstered furniture frames were developed taking into account orthotropic properties of solid pine wood (Pinus sylvestris L.) without and with details strengthening their structure in the form of glue joints and upholstery staples. Using the CAE Autodesk Inventor Nastran finite element method, linear static analyses were performed by simulating normative loading. The finite element method was performed considering the experimentally determined stiffness coefficients of the PCAC adhesive and staple joints. As a result, stress, displacement, and equivalent strain distributions were obtained for upholstered furniture frame models with stapled corner joints. The deformation and strength behavior of the upholstered furniture frames was improved by reinforcing with a wood strip. A new approach to the design of upholstered furniture frame frames using the FEM method with stapled component connections was developed and tested. The results of the study can be applied in the optimization of upholstered furniture construction.
Modelling Upholstered Furniture Frames Using the Finite Element Method
This study employs the finite element method to propose a model-based design strategy for upholstered furniture frames. Three-dimensional discrete models of these frames were created, considering the orthotropic characteristics of pine (Pinus sylvestris L.) and spruce (Picea abies L.) wood, reinforced structurally with glue joints and upholstery staples. The modelling process utilised the CAE system Autodesk Inventor Nastran, applying the finite element method (FEM). Static analyses were performed by simulating standard loading conditions. The calculations incorporated the stiffness coefficients of the frame’s comb joint connections. The findings illustrate the stress distribution, displacements, and equivalent strains within the furniture frame models. The deformation and strength parameters of the frames introduce a novel perspective on designing upholstered furniture structures using the component-based FEM approach. These outcomes are applicable to the development of upholstered furniture designs.
Analysis of the chair's comfort before and after renovation
Furniture is an object that accompanies us in everyday life. Therefore, it is important to choose appropriate dimensions, tailored to the human body, which will ensure comfort during use. Due to the noticeable gradual wear and tear of furniture or its components, these products are renewed and renovated. Both external and internal damages are reflected not only in the subjective feelings of furniture users, but also in objective studies showing comfort coefficients in numerical values. The main objective of this study was to compare the comfort of use of two AGA chairs before and after renovation. The objective was achieved by examining the comfort of use for the seat and backrest of both chairs using a sensor mat. The comparison was made based on the results of the tests, which were obtained in the form of color maps of stress distributions, SPD and D coefficients. For the first chair, the original layout was used, the same as in the chair before renovation, with the use of new materials. In the second chair, the upholstery layout was changed in relation to the original. Based on the results obtained, it was noted that during the renovation of used chairs, restoring their original structure results in improved utility properties. However, any changes to the structure that differ from the original upholstery layout may result in the failure to restore the initial level of comfort.