• Journal of Aerospace System Engineering
• /
• v.14 no.6
• /
• pp.18-25
• /
• 2020

This study investigated the structural behaviors and safety of an electro-mechanical linear actuator and a load simulator with a plate spring. The material and dimensions of the plate spring were determined by theoretically calculating the stress and torsional angle for the rating load of the actuator. Thereafter, a flexible multibody dynamics (FMBD) analysis was conducted on the linear actuator and load simulator to confirm the performance of the load simulator and acquire the reaction forces acting on the actuator and simulator. The structural safety of the linear actuator and load simulator was evaluated via finite element analysis using the aforementioned reaction forces. Consequently, the proposed linear actuator and load simulator were determined to be structurally safe; however, the safety factors for the actuation rod and the housing on the actuator were excessively high. Therefore, the weight and cost must be reduced to improve their design parameters in the future.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.11 no.5
• /
• pp.105-111
• /
• 2003

The three-axis road simulator is the test equipment which can simulate the standardized road conditions for the durability evaluation of automotive components such as suspensions. The road load data are collected and acquired from a vehicle test, and then these data are used to simulate road load conditions by the road simulator which consists of hydraulic actuators, link mechanism and servo controller. The link mechanism must be designed in consideration of the dynamic effect and interference during three axes motions in order to generate accurate motions. In this paper, the structural and kinematic analysis of the link mechanism is performed, and these results can be used for developing the three-axis road simulator. The three-axis road simulator provides considerable savings in cost, development time, and testing risk during developing automotive components.

• Journal of the Korean Society for Precision Engineering
• /
• v.28 no.3
• /
• pp.265-274
• /
• 2011

This paper presents current state of the prediction simulator of structural characteristics of machinery equipment accuracy. Developed accuracy prediction simulator proceeds and estimates the structural analysis between the designer and simulator through the internet for convenience of designer. 3D CAD model which is input to the accuracy prediction simulator would simplified by the process of removing the small hole, fillet and chamfer. And the structural surface joints would be presented as the spring elements and damping elements for the structural analysis. The structural analysis of machinery equipment joints, containing rotary motion unit, linear motion unit, mounting device and bolted joint, are presented using Finite Element Method and their experiment. Finally, a general method is presented to tune the static stiffness at a rotation joint considering the whole machinery equipment system by interactive use of Finite Element Method and static load experiment.

• Composites Research
• /
• v.32 no.5
• /
• pp.279-283
• /
• 2019

A flight training simulator of a fully spherical configuration is being developed to precisely and quickly control six degrees of freedom (Dof) motions especially with unlimited rotations. The full-scale simulator should be designed with a lightweight material to reduce inertial effects for fast and stable feedback controls while no structural failure is ensured during operations. In this study, a sandwich composite consisting of glass fiber reinforced plastics and a foam core is used to obtain high specific strengths and specific stiffnesses. T-type stainless steel frames are inserted to minimize the deformation of the sphere curvature. Finite element analysis is carried out to evaluate structural safety of the simulator composed of the sandwich sphere and steel frames. The analysis considers the weights of the equipment and trainee and it is assumed to be 200 kg. Gravity acceleration is also considered. The stresses and displacement acting on the simulator are calculated and the safety is assessed under two different situations.

• Computational Structural Engineering
• /
• v.28 no.3
• /
• pp.38-41
• /
• 2015

• Computational Structural Engineering
• /
• v.22 no.6
• /
• pp.92-97
• /
• 2009

• Journal of the Korea Computer Industry Society
• /
• v.10 no.4
• /
• pp.121-126
• /
• 2009

In this paper, the patch antenna for 2.64GHz S-DMB applications has been studied. The patch antenna was designed by HFSS (High Frequency Structural Simulator) program and the optimized antenna was fabricated using photolithography method on the FR-4 substrate. To find optimal conditions of microstrip patch antenna, design parameters with different patch size, length of feedline and metal thickness were analyzed.

• Journal of the Korea Computer Industry Society
• /
• v.10 no.3
• /
• pp.67-72
• /
• 2009

In this paper, the microstrip patch antenna was designed by HFSS(High Frequency Structural Simulator). The characteristics of the microstrip patch antenna was analyzed. To find optimal conditions of microstrip patch antenna for 2.64GHz center frequency, the parameters with different patch size, width of slot, and length of slot were changed.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 1999.10a
• /
• pp.225-232
• /
• 1999

For the study of the seismic-response control, it is necessary to use an experimental system with an earthquake simulator and control devices employing a hydraulic actuator system. However, such system is too expensive to prepare at the university laboratory. In this research, an economical experimental system is developed which has a small-sized earthquake simulator and an AMD using AC servo motors. An accurate mathematical model of the three-degree-of-freedom tests structure with an AMD is developed from the measurement of the input/output relationships of the structure. This paper demonstrates experimentally the efficacy of the frequency domain optimal control algorithm H$_2$in reducing the response of seismically excited building to verify the performance of the experimental system.

• Proceedings of the Korean Society for Technology of Plasticity Conference
• /
• 1999.03b
• /
• pp.86-89
• /
• 1999

Structural analysis of die set in cold forging is conducted by the finite element method and the results are introduced in this paper. The problem formulation is introduced in detail. In the approach, amount of shrink fit is controlled by thermal load, i.e., temperature difference between die insert and shrink fits. The loading conditions are extracted automatically from a forging simulator. An application example is given.