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Recently, as interest in the internet of things has increased, a vibration energy harvester has attractedattention as a power supply method for a wireless sensor. The vibration energy harvester can be divided intopiezoelectric types, electromagnetic type and electrostatic type, according to the energy conversion type. Theelectromagnetic vibration energy harvester has advantages, in terms of output density and design flexibility,compared to other methods. The efficiency of an electromagnetic vibration energy harvester is determined bythe shape, size, and spacing of coils and magnets. Generating all the experimental cases is expensive, interms of time and money. This study proposes a method to perform design optimization of anelectromagnetic vibration energy harvester using an open source, big data platform.
Additive manufacturing (AM) technologies have attracted wide attention as key technologies for the nextindustrial revolution. Among AM technologies using various materials, powder bed fusion (PBF) processesand direct energy deposition (DED) are representative of the metal 3-D printing process. Both of theseprocesses have a common feature that the laser is used as a heat source to fabricate the 3-D shape throughmelting of the metal powder and solidification. However, the material properties of the deposited metals differwhen produced by different process conditions and methods. 17-4 precipitation-hardening stainless steel(17-4PH SS) is widely used in the field of aircraft, chemical, and nuclear industries because of its goodmechanical properties and excellent corrosion resistance. In this study, we investigated the differences inmicrostructure and mechanical properties of deposited 17-4PH SS by PBF and DED processes, including theheat treatment effect.
Mechanical systems installed in transport devices, such as vehicles, airplanes, and ships, are mostly subject to translational accelerations at the joints during operations. This base acceleration excitation has a large influence on the performance of the system, therefore, its response must be well analyzed. However, the existing methods for dynamic analysis of structures have some limitations in use. This study presents a new numerical method using relative acceleration to solve these limitations. If the governing equation of motion is linear and the mass matrix, the damping matrix, and the stiffness matrix are constant over time in the finite element analysis, the proposed method can be applied to the transient behavior analysis and the harmonic response analysis of the structure. Because it is not necessary to introduce a virtual mass and the rigid body motions are removed from the analysis, it is possible to use not only the direct integration method in the time domain but also the mode superposition method to obtain the dynamic responses. This paper demonstrates with three examples how the present method is suitable for the dynamic analysis of a structure with multi-degree of freedom.
In this study, we analyzed a cold drawn (CD) bar packaging automation facility to examine its structuralsafety. The structural analysis focused on the frame part of the automatic packing machine for the CD roundrod widely used in the industrial field, as well as the package supply device, banding suit, and crane part. As a result, we concluded that the structural safety for the banding suit, crane, and package supply devicehave been secured (safety factors of 9.8, 7.5, and 14.5, respectively). In addition, the safety factor of thetransfer was 4.0.
The purpose is to evaluate the structural characteristics of 750 mm diameter injection spiral blades under various operating conditions. A fiber-glass reinforced polypropylene material was employed to the injection blades, and mechanical tests on two kinds of glass-reinforced polypropylene were performed to evaluate the mechanical properties and to select a suitable candidate material. Also, three kinds of spiral blade geometries were studied to observe the influence of fixing rods between blades. For this, structural analyses were conducted to understand the role of fixing rods under a range of rotating speed. In addition, modal analysis was performed to confirm the resonance in the operating speed range. One-way fluid-structure interaction (FSI) analysis was carried out to know its mechanical integrity under dangerous wind speed conditions. Through this work, the structural characteristics of the proposed spiral blade geometries were studied under various operating conditions, and the requirements of mechanical properties of blades were determined.
In this research, we developed a pilot wire-drawing machine as well as wire end-pointing roller. Using these machines, we performed a pilot wire-drawing test at different coating material and lubricant when the reduction ratio is 10 %. To inversely compute the friction coefficient between the coating layer of wire and the surface of die for a specific lubricant, we carried out a series of three dimensional finite element analysis. Results show that the drawing force is varied with the coating material of wire at the same reduction ratio and lubricant. It is noted that the frictional coefficient in drawing is dependent on the coupled property of coating material and lubricant, indicating the best coating material for a given lubricant.
In this study, we analyzed a cold drawn (CD) bar packaging automation facility to examine its structural safety. The structural analysis focused on the frame part of the automatic packing machine for the CD round rod widely used in the industrial field, as well as the package supply device, banding suit, and crane part. As a result, we concluded that the structural safety for the banding suit, crane, and package supply device have been secured (safety factors of 9.8, 7.5, and 14.5, respectively). In addition, the safety factor of the transfer was 4.0.
This study investigated the effect of the changes in metal characteristics due to the hot forging on SCR420HB applied to ensure the optimal production of the hot-forging ratio on the mechanical properties of an automotive automatic transmission gear. The microstructural changes in the forging ratio were investigated by adjusting the forging range into multiple ranges from alloy steel. This was done in order to set the optimum forging range given the manufacturing process conditions during the hot forging of alloy steel parts with a carbon content of more than 0.8% wt. The effects of the content change in the microstructure on the mechanical properties due to the use of the part were examined.