This paper is a study on using gas springs for reduced friction in the elevation of the large television stand.Target is applied to the operation of the elevation over 50-inch television that uses a gas spring. Gas seal lip technology is needed for development acting on the piston rod in order to obtain a reduction in friction in elevation operation. In order to acting on the gas seal lip technology, the improved friction force can be obtained through the inner diameter of gas seal lip, the design of cutting angle and the changes of material.
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The gyroscopes have been used as a suitable inertial instrument for the navigation guidance and attitude controls. The accuracy as very sensitive sensor is limited by the lock-in region(dead band) due to the frequency coupling between two counter-propagating waves at low rotation rates. This frequency coupling gives no phase difference, and an angular increment is not detected. This problem can be overcome by mechanically dithering the gyroscope. This paper presents the design method of mechanical dither by the theoretical considerations and the verification of the theoretical equations through FEM(Finite Element Method) applications. As a result, the maximum prediction error of resonant frequency and peak dither rate was under 5 percent. The theoretical equations for the mechanical performances of dither can be said to be feasible.
In the design of an automotive structural component, one of the more important tasks for a design engineer is to determine the life of the component and to ensure that the component will not fail prematurely. In order to accomplish this, a design engineer will first use simple section analysis to come up with a section shape in the concept design stage and use more advanced analysis for stress level. At this stage, the analysis should focus on understanding overall behavior in terms of load paths and gross stress levels. A model that is adequate for a stiffness analysis of the structure will usually provide an adequate level of stress information in the design process. To perform a detailed stress analysis, the structure models must have the detailed local areas such as stress concentrations or force(or displacement) distributions.This paper is to present the design considerations for the stress analysis of automotive structure.•
With CT specimen models of CFRP with cracks and adhesive interfaces, this study aims at investigating the strength characteristics of heterogeneous composite materials bonded by adhesives through the analyses. Even minor cracks or defects that may occur inside a composite material in
the manufacturing process can result in the stress concentration, and this will lead to the material breakage. So, we designed CT specimen models with CFRP alone and CFRP with stainless steel or aluminum by using their material properties of CFRP, stainless steel, and aluminum. The simulation
analyses were carried out and their strength characteristics were investigated. It is necessary to prepare a way to relieve stress concentration at the stage of design under the assumption those cracks actually occur at manufacturing process. By combining CFRP with stainless steel or aluminum,
both of which have good ductility, we found that the deformation and deformation energy increased and the maximum equivalent stress decreased. It is thought that this material can lower the risk of material breakage by changing some of the impact energy which may damage CFRP, into the deformation
energy. This deformation energy brings about the good ductility by utilizing stainless steel and aluminum under the situations where the sudden tension and impact loads are expected or applied. The results revealed that when CFRP was combined with the heterogeneous metal, it was possible for
CFRP to be used where otherwise it could not be used alone and provided CFRP with better material property and more diverse process-ability So, this composite material can be prevented from breakage in the process of manufacturing and increase the safe use. As CFRP with the rigidity better
than metals can be applied to composites, the composites with CFRP can be improved to have better material property and more diverse process-ability
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