Papers by Keyword: Hinge

Abstract: This study is concerned with a design process for a foldable container structure using a finite element analysis. A foldable container structure consists of frames, panels and hinge systems. The main structure of a foldable container carries all the loads while a hinge system is designed to provide its foldability. In this work, finite element structural analyses for the main foldable container structure are carried out based on the ISO standard regulation, whose results are then taken for the design of a hinge system. The finite element analysis with two types of hinge systems are also performed. It is found out that the main structure of a standard 20ft container could be used for the foldable container with the same capacity if the corner edge in the side assembly is strengthened. It is also concluded that the hinge systems proposed in this work could be successfully used in a foldable 20ft container.

Abstract: It is a FTS with flexible hinge that can be replaceable. It includes flexible hinges, a movable block, piezoelectric ceramic driver and framework. The flexible hinge is installed on inner side of the frame, and the other side is connected with the movable block. The piezoelectric ceramic driver is installed in movable block, and its other end is installed on the end beam of the frame. There is a tool base in the front end of the movable block on which the diamond tools can be fixed. Under the support of the flexible hinges, the tool can move back and front driven be piezoelectric ceramic driver. Through the simulation analyses with finite element technology and experiment, it is certify that the design of FTS is successful and practical to further study.

Abstract: The simple-supported beam bridge is a common structure form widely used in small and medium span bridges. When the span is longer, the maximum bending moment is accordingly bigger. The maximum positive and negative bending moment numerical of beam decreases obviously because of cantilever bridge with cantilever beams to reduce the amount of materials. This article analyzes the current commonly used cantilever bridge with large span. The two-span cantilever bridge is analyzed under various loads about the internal force according to the condition of the absolute value of the maximum positive and negative bending moment being equal. It carries on the contrast and analysis about simple-supported beam bridges and obtains the best location of the hinge in the cantilever bridge. Moreover, it provides some reference for the optimum design of similar bridges and projects.

Abstract: Ductility is an important aspect of cyclically loaded reinforced concrete (RC) structures. One of the method that can be used to measure the ductility of an RC structure is the moment-curvature approach. However, due to it being a strain-based approach it cannot be used to directly simulate behaviour associated with interface displacement that occur when an RC member is cracked. This leads to dependency on empirical values, which imposes limitations on how the moment-curvature approach can be used. In recent years a new displacement based method for measuring ductility has been developed, and can simulate the interface displacement behaviours through the use of partial-interaction theory and shear friction theory. This paper aims to extend the general tension stiffening analysis of the displacement-based approach to allow for cyclic loading. The tension-stiffening analysis was then validated against experimental results and the results were found to agree fairly.

Abstract: The contact surface of a hinge suffers huge pressure in particularly bad lubrication conditions. Reinforced polymer bearing pads offers low friction under dry sliding conditions. Load transfer between contact surfaces was studied, showing that the pressure and positions are related to the power output of the loco. The friction coefficient of concave bearings with polymer pads was low, and would not totally failed in a high contact stress. Performances of polymer pads on loads were simulated, and provided a global analysis for the design of the pads.

Abstract: Computer Aided Engineering (CAE) software is a vital analytical tool which is often adopted for product design. Engineers can obtain related design information for stress, strain, displacement, fatigue, and longevity of products via a CAE simulation. In order to improve product reliability, analysis of a products structure using CAE is compulsory. The purpose of this research is to implement CAE analysis on a laptops hinge. A 3-D model of the laptops hinge was first established by Pro/Engineer software and then transferred onto ANSYS/Workbench software. Moreover, all boundary conditions, connections, materials, and mesh property were set into an ANSYS program. Subsequently, the calculation of kinetic behavior for the hinge structure and maximum stress and stress allocation were performed by the ANSYS. In order to verify the correctness of the parameter settings on ANSYS/Workbench software, a products breaking test was conducted. A comparison between the experimental data and the theoretical data of the ANSYS was also carried out. Consequently, the deviation between the analyzed data and the real testing data is within 5%. Therefore, the analytical methods established above can provide a quick and efficient design for the structural strength of a hinge stopper.

Abstract: Flexure hinges have been widely used as mechanisms for high precision positioning stages that have a micrometer or nanometer resolution. This paper describes the analysis of a 3-DOF rotationally symmetric hinge for the vertical mask aligner stage. The vertical mask aligner stage was designed to overcome the bending of masks by gravity. In order to align the mask and the wafer, the vertical mask aligner stage has one linear motion and yaw rotating motions (Z, Θx, Θy). The new vertical mask aligner stage will try to use rotationally symmetric hinges. These rotationally symmetric hinges would act as guide mechanisms. However, the exact 6-DOF stiffness analysis of the rotationally symmetric hinge did not use these hinges as guide mechanisms. Therefore, this paper focuses on the stiffness analysis of the rotationally symmetric hinges.

Abstract: The steel roof truss rod is widely used in Chinese building industrue, because of the reasonable force, the design and simple construction, the good economic indicators, attractive appearance and many other advantages. Based on a pin 24m steel roof truss static test research and the results, which is based on the rigid and hinged to calculate, show that the steel roof truss which has the property that the web member axis intersection point and the chord member centroid are coincident, is in a good agreement according the calculation of rigid or hinge compared with the actual stress state.

Abstract: Single storey industrial plant, civil building and shelters from rain in stadium and gymnasium both have roof system. They are spatial structures. This paper intends to calculate the internal load of a simple truss when external load is applied between truss nodes. Quadrangular pyramids supporting system was also discussed. For the roof trusses, if the node is rigid connection, they can not be simplified as hinges connection. If the node of quadrangular pyramids is rigid connection, the author of this paper speculated that if the supporting bar does not occur bending deflection, the calculation that simplified the rigid connection as hinge connection is approximately right which needs future experimental validation. The buckling analysis of the top chord for roof trusses and the bars in quadrangular pyramids supporting system are both important.

Abstract: This paper presents a novel hinge mechanism for deployment of spacecraft subsystems such as antennas, solar arrays. By using Axiomatic design theory, the conceptual design of the hinge mechanism is suggested, which has not only high deployed stiffness and low deployment shock but also does not require lubrication and accurate fabrication. That is, optimization of deployment torque and maximization of the deployed stiffness can be possible since this suggested hinge mechanism is decoupled design. And the suggested hinge mechanism is fabricated and tested to evaluate the feasibility. Quasi-static analysis is performed to optimize deployment torque for low deployment shock by using FEM. Also, the bending stiffness is measured by 4 point bending test.