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Wire electrical discharge machining (WEDM) or Wire-cut EDM is a non-traditional machining process, This process is a spark erosion process. That erodes material from work piece by a successive of electrical discharges. The spark erosion process is occurred between work piece and wire electrode. The wire electrode is used as the cutting tool. WEDM is widely used to cut high complexity shapes and present...
While forestry is an important economic factor, the common methods used to estimate potential financial gains from undertaking a harvest project in Germany are usually based on heuristics and experience. Experience-based estimation methods focus on utilizing a few general statistical parameters that define the harvest operation, employing an abstract view on wood harvesting. To improve the accuracy...
A micro-spiral beam device for the vibration-type sensor and actuator structure has been designed. To improve vibration behaviors of the micro-spiral device, beam wave motion and beam deflection need to be suppressed associated with external load. Finite element analysis (FEA) method was carried out to design a spiral beam without beam wave motion. The trapezoidal width spiral was proposed to suppress...
Like most new technologies, also 3D printing has long belonged among narrow specialized fields, but the potential of this technology is enormous and so it is gradually being applied in more and more new sectors. The aim of this article is to point out the 3D printer workbench adjustment possibility of the RepRap project and test individual materials for working boards. Gradually, the text approaches...
Doubly fed induction generator (DFIG) is widely used in wind energy generation systems, using back-to-back PWM converters to control variable speeds. Operation stability, as an essential aspect of DFIG wind turbine system, has raised attention for recent years. Although multiple control schemes have been published to solve instability problems, few considers the unstable torque from the stator and...
The purpose of this study was to survey the sharp injuries on opening the glass ampoules. A questionnaire was used to survey the behaviors and sharp injuries while nurses opening glass ampoules. About 90.3% of nurses reported to have experienced with sharps injuries and about 37.6% of nurses occurred more than once sharp injuries by opening the glass ampoules during recent 6 months. Results of ergonomic...
The purpose of this study was to investigate the upper extremity musculoskeletal problems by fastening together sheets of paper with staples and effects of various types of stapler on subjective ratings and muscles activities. Nine participants performed 25 trials with five types of stapler (i.e. hand clamp type, desk type, press type L13, press type L11, press type L9) on five repetitions. Further,...
The main purpose of this study is to investigate the heat transfer enhancement provided by ionic wind on LED. Ionic wind is applied onto a bulk flow in order to distort the boundary layer in an effort to increase the cooling effect on the LED. The ionic wind generator used in this case involved a stainless steel needle acting as emitter electrode while a copper tape is used as collector electrode...
Fused deposition modeling (FDM) is a fast growing technology due to its ability to build functional parts having complex geometrical shape in reasonable time period. Traditionally, FDM have been able to build parts only in thermoplastic but the modern FDM can process parts in composite material filaments such as poly lactic acid (PLA) filled bronze, iron or stainless steel in which these materials...
A de-cubing process are important in the Laminated Object Manufacturing (LOM) technique, creates a physical model directly from 3D CAD model without mold and dies by using laminated material. The de-cubing process is to assign shape of waste material into generally small square shape that can be easily remove in order to reduce time and avoid prototype damages. The adaptive de-cubing process applies...
Float glass manufacturing problems concern a finding of cost minimizing production sequence such that total scraps are minimized. We show that these problems could be transformed into Asymmetric Traveling Salesman Problems with Time Window (ATSPTW), where a customer is defined as a production order and an arc connecting two orders indicates changeover scraps and setup time. A variable arc exchange...
This case study was conducted at a company engaged in the processing of palm oil into Crude Palm Oil (CPO). During this time, the company's factory is not operating effectively and efficiently. The production planning in the company is done with estimation that based on past demand. But the estimation made less effective because the companies are often faced with some situations such as incompatibility...
Automated guided vehicles have been widely used in flexible manufacturing systems especially in a job shop and flow shop. Recently, they are included in other fields such as container terminals. This paper demonstrates a literature review of the last three decades about the scheduling problems of the automated guided vehicles in three main classes, namely job shops, flow shops, and container terminals...
This study addresses the assembly line balancing problem (ALBP) in the sewing line of a footwear company with constraints not only on precedence relation of tasks and workstation's cycle time but also on resource constraints. The resource constraint is considered as a type of machines on each workstation in which every station can be operated by only one type of machine. We propose a dynamic programming...
Cement is one of the strategic commodities that supporting acceleration of infrastructure development and economic growth. It forces the cement companies to improve the production process to be more effective and efficient. Therefore, the cement companies are required to understand which of activities can increase the value added to the product. This study aims to minimize wastes in the cement production...
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