RESISTOR (elektRonika kEndali telekomunikaSI tenaga liSTrik kOmputeR)
Kecenderungan pada dewasa ini, ada berbagai masalah yang muncul pada bidang pertanian. Salah satu... more Kecenderungan pada dewasa ini, ada berbagai masalah yang muncul pada bidang pertanian. Salah satu dari masalah tersebut yang paling utama adalah keterbatas lahan untuk ditanami. Perlu diketahui bahwa dengan peningkatan jumlah penduduk dan pembangunan, ketersediaan lahan pun menjadi berkurang secara signifikan. Rumah kaca menjadi salah satu jawaban dari masalah tersebut. Rumah kaca pada jaman ini sudah dilengkapi dengan sistem kendali dan monitoring sebagai salah satu improvement rumah kaca cerdas. Tentunya Rumah Kaca cerdas seperti demikian membutuhkan energi listrik yang handal dan berkelanjutan untuk mendapatkan fungsi rumah kaca cerdas yang baik. Penelitian ini melakukan analisis, simulasi, desain, dan implementasi nyata sistem pendayaan energi listrik untuk rumah kaca tersebut. Pendayaan energi listrik tersebut akan didayai dengan energi terbarukan yaitu energi matahari dengan teknologi PV pada Pembangkit Listrik Tenaga Surya. Sehingga dibutuhkan identifikasi beban-beban dan keb...
Industry 4.0 adalah proses digitalisasi sektor manufaktur, dengan berbagai macam sensor yang tert... more Industry 4.0 adalah proses digitalisasi sektor manufaktur, dengan berbagai macam sensor yang tertanam di hampir semua komponen produk dan peralatan manufaktur yang terlibat, sistem siberfisik (Cyber-Physical Systems) di mana-mana, dengan kemampuan analisis dari semua data yang berhubungan dengan proses yang ada. Implementasi konsep Industry 4.0 merupakan inti dari proses Revolusi Industri Keempat yang terjadi saat ini. Proses ini akan membuat proses produksi saat ini menjadi semakin efisien dan terhubung dengan lingkungannya. Namun, seiring dengan faktor efisiensi yang dibawanya, konsep baru ini juga menimbulkan banyak kekhawatiran seperti masalah kesiapan industri, kesiapan tenaga kerja, kesiapan struktur sosial, budaya dan regulasi. Artikel ini merupakan sebuah telaah pustaka (paper review) yang akan menjabarkan konsep Industry 4.0 serta melakukan analisis kemungkinan dampak implementasinya pada industri di Indonesia. Hasil telaah ini sangat diperlukan bagi Jurusan Teknik Mekatronika UNPAR dalam menyusun strategi jangka panjangnya, terutama pada perencanaan kurikulumnya, agar dapat menghasilkan lulusan yang sesuai dengan kebutuhan tenaga kerja dalam konsep Industry 4.0. Kata Kunci: industry 4.0, industri manufaktur, pendidikan tinggi, teknik mekatronika.
We provide a basic method of Smoothed Particle Hydrodynamics (SPH) to simulate liquid droplet wit... more We provide a basic method of Smoothed Particle Hydrodynamics (SPH) to simulate liquid droplet with surface tension in three dimensions. Liquid droplet is a simple case for surface tension modeling. Surface tension works only on fluid surface. In SPH method, we simply apply the surface tension on the boundary particles of liquid. The particle on the 3D boundary was detected dynamically using Free-Surface Detection algorithm. The normal vector and curvature of the boundary surface were calculated simultaneously with 3D boundary surface reconstruction using Moving Least-Squares (MLS) method. Before the reconstruction, the coordinate system was transformed into a local coordinate system. Afterwards, the surface tension force which depends on curvature of the surface, was calculated and applied on the boundary particles of the droplet. We present the simulation result of droplet motion with gravity force. By using the basic method of SPH for fluid modeling, and a combination of 3D Free-Surface Detection algorithm with MLS method, we can simulate droplet phenomena with expected result.
This paper presents the study and implementation of finite element method to find the temperature... more This paper presents the study and implementation of finite element method to find the temperature distribution in a rectangular cavity which contains a fluid substance. The fluid motion is driven by a sudden temperature difference applied to two opposite side walls of the cavity. The remaining walls were considered adiabatic. Fluid properties were assumed incompressible. The problem has been approached by two-dimensional transient conduction which applied on the heated sidewall and one-dimensional steady state convection-diffusion equation which applied inside the cavity. The parameters which investigated are time and velocity. These parameters were computed together with boundary conditions which result in temperature distribution in the cavity. The implementation of finite element method was resulted in algebraic equation which is in vector and matrix form. Therefore, MATLAB programs used to solve this algebraic equation. The final temperature distribution results were presented in contour map within the region.
A simple free-surface particle detection method for two and three-dimensional SPH simulation has ... more A simple free-surface particle detection method for two and three-dimensional SPH simulation has been implemented. The method uses sphere representation for the SPH particle. The fluid domain is covered by overlapping spheres. A sphere whose surface is not fully covered considered as boundary. To test particle boundary status, we used a sum of normalized relative position vectors from neighbouring particles to the test particle. By checking the existence of un- covered sphere surface by this vector sum, boundary status of the test particle can be determined. This boundary detection method can be easily embedded in the SPH solver algorithm.
This paper proposes a new model for Giant Magnetoresistance (GMR) and calculates its typical grap... more This paper proposes a new model for Giant Magnetoresistance (GMR) and calculates its typical graph qualitatively. The model's foundation is the microscopic mechanism in GMR, where the GMR effect can be explained by intrinsic and extrinsic potential. The potentials are spin-dependent. The potentials determine the transmission probability then it will give conductance value. Here, the multiple barrier potential model is proposed as the new GMR model. The transmission probability is determined using transfer matrix method. It was found that this model is fit qualitatively with the typical GMR graph.
The solidification behavior of liquid metal in a container under rapid cooling process is one of ... more The solidification behavior of liquid metal in a container under rapid cooling process is one of the major concerns to be analyzed. In order to analyze its fundamental behavior, a three- dimensional (3D) fluid dynamics simulation was developed using a particle-based method, known as the smoothed particle hydrodynamics (SPH) method. Governing equations that determine the fluid motion and heat transfer involving phase change process are solved by discretizing their gradient and Laplacian term with the moving particles and calculating the interaction with its neighboring particles. The results demonstrate that the SPH mehod can successfully reproduce the behavior and defect prediction of liquid metal solidification process.
In this paper, we applied an improved Smoothing Particle Hydrodynamics (SPH) method by using grad... more In this paper, we applied an improved Smoothing Particle Hydrodynamics (SPH) method by using gradient kernel renormalization in three-dimensional cases. The purpose of gradient kernel renormalization is to improve the accuracy of numerical simulation by improving gradient kernel approximation. This method is implemented for simulating free surface flows, in particular dam break case with rigid ball structures and the propagation of waves towards a slope in a rectangular tank.
This paper presents the study and implementation of finite element method to find the temperature... more This paper presents the study and implementation of finite element method to find the temperature distribution in a rectangular cavity which contains a fluid substance. The fluid motion is driven by a sudden temperature difference applied to two opposite side walls of the cavity. The remaining walls were considered adiabatic. Fluid properties were assumed incompressible. The problem has been approached by two-dimensional transient conduction which applied on the heated sidewall and one-dimensional steady state convection-diffusion equation which applied inside the cavity. The parameters which investigated are time and velocity. These parameters were computed together with boundary conditions which result in temperature distribution in the cavity. The implementation of finite element method was resulted in algebraic equation which is in vector and matrix form. Therefore, MATLAB programs used to solve this algebraic equation. The final temperature distribution results were presented i...
The present paper introduces stochastic velocity as improvement for moving particle semi-implicit... more The present paper introduces stochastic velocity as improvement for moving particle semi-implicit (MPS) method. This improvement is to overcome energy loss caused by numerical dissipation in the basic MPS that brings about rapid decay of waves. Stochastic velocity is added in the explicit step of the basic MPS method. MPS with stochastic improvement is compared with the basic method in the case of linear water waves, in particular dam break problem and standing wave in a rectangular tank. Surface detection and curve fitting are used to analyze the parameters of wave on the standing wave case. The surface detection and curved fitting was efficient to determine parameters of the wave and it was found that the stochastic improvement made the waves survived longer than in the basis method.
A simple free-surface particle detection method for two and three-dimensional SPH simulation has ... more A simple free-surface particle detection method for two and three-dimensional SPH simulation has been implemented. The method uses sphere representation for the SPH particle. The fluid domain is covered by overlapping spheres. A sphere whose surface is not fully covered considered as boundary. To test particle boundary status, we used a sum of normalized relative position vectors from neighbouring particles to the test particle. By checking the existence of un- covered sphere surface by this vector sum, boundary status of the test particle can be determined. This boundary detection method can be easily embedded in the SPH solver algorithm.
This paper proposes a new model for Giant Magnetoresistance (GMR) and calculates its typical grap... more This paper proposes a new model for Giant Magnetoresistance (GMR) and calculates its typical graph qualitatively. The model's foundation is the microscopic mechanism in GMR, where the GMR effect can be explained by intrinsic and extrinsic potential. The potentials are spin-dependent. The potentials determine the transmission probability then it will give conductance value. Here, the multiple barrier potential model is proposed as the new GMR model. The transmission probability is determined using transfer matrix method. It was found that this model is fit qualitatively with the typical GMR graph.
Monthly Notices of the Royal Astronomical Society, 2006
We present three dimensional smoothed particle hydrodynamics (SPH) calculations of warped accreti... more We present three dimensional smoothed particle hydrodynamics (SPH) calculations of warped accretion discs in X-ray binary systems. Geometrically thin, optically thick accretion discs are illuminated by a central radiation source. This illumination exerts a non-axisymmetric radiation pressure on the surface of the disc resulting in a torque that acts on the disc to induce a twist or warp. Initially planar discs are unstable to warping driven by the radiation torque and in general the warps also precess in a retrograde direction relative to the orbital flow. We simulate a number of X-ray binary systems which have different mass ratios using a number of different luminosities for each. Radiation-driven warping occurs for all systems simulated. For mass ratios q ∼ 0.1 a moderate warp occurs in the inner disc while the outer disc remains in the orbital plane (c.f. X 1916 − 053). For less extreme mass ratios the entire disc tilts out of the orbital plane (c.f. Her X-1). For discs that are tilted out of the orbital plane in which the outer edge material of the disc is precessing in a prograde direction we obtain both positive and negative superhumps simultaneously in the dissipation light curve (c.f. V603 Aql).
Dam is built for water supply, water flow or flooding control and electricity energy storage, but... more Dam is built for water supply, water flow or flooding control and electricity energy storage, but in other hand, dam is one of the most dangerous natural disaster in many countries including in Indonesia. The impact of dam break in neighbour area and is huge and many flooding in remote area, as happen in Dam Situ Gintung in Tangerang (close to Jakarta) in 2009. Smoothed Particle Hydrodynamics (SPH), is one of numerical method based on Lagrangian grid which is ap- plied in astrophysical simulation may be used to solve the simulation on dam break effect. The development of SPH methods become alternative methods to solving Navier Stokes equation, which is main key in fluid dynamic simulation. In this paper, SPH is developed for supporting solid par- ticles in use for 3D dam break effect (3D-DBE) simulation. Solid particle have been treated same as fluid particles with additional calculation for converting gained position became translation and rotation of solid object in a whole body. ...
RESISTOR (elektRonika kEndali telekomunikaSI tenaga liSTrik kOmputeR)
Kecenderungan pada dewasa ini, ada berbagai masalah yang muncul pada bidang pertanian. Salah satu... more Kecenderungan pada dewasa ini, ada berbagai masalah yang muncul pada bidang pertanian. Salah satu dari masalah tersebut yang paling utama adalah keterbatas lahan untuk ditanami. Perlu diketahui bahwa dengan peningkatan jumlah penduduk dan pembangunan, ketersediaan lahan pun menjadi berkurang secara signifikan. Rumah kaca menjadi salah satu jawaban dari masalah tersebut. Rumah kaca pada jaman ini sudah dilengkapi dengan sistem kendali dan monitoring sebagai salah satu improvement rumah kaca cerdas. Tentunya Rumah Kaca cerdas seperti demikian membutuhkan energi listrik yang handal dan berkelanjutan untuk mendapatkan fungsi rumah kaca cerdas yang baik. Penelitian ini melakukan analisis, simulasi, desain, dan implementasi nyata sistem pendayaan energi listrik untuk rumah kaca tersebut. Pendayaan energi listrik tersebut akan didayai dengan energi terbarukan yaitu energi matahari dengan teknologi PV pada Pembangkit Listrik Tenaga Surya. Sehingga dibutuhkan identifikasi beban-beban dan keb...
Industry 4.0 adalah proses digitalisasi sektor manufaktur, dengan berbagai macam sensor yang tert... more Industry 4.0 adalah proses digitalisasi sektor manufaktur, dengan berbagai macam sensor yang tertanam di hampir semua komponen produk dan peralatan manufaktur yang terlibat, sistem siberfisik (Cyber-Physical Systems) di mana-mana, dengan kemampuan analisis dari semua data yang berhubungan dengan proses yang ada. Implementasi konsep Industry 4.0 merupakan inti dari proses Revolusi Industri Keempat yang terjadi saat ini. Proses ini akan membuat proses produksi saat ini menjadi semakin efisien dan terhubung dengan lingkungannya. Namun, seiring dengan faktor efisiensi yang dibawanya, konsep baru ini juga menimbulkan banyak kekhawatiran seperti masalah kesiapan industri, kesiapan tenaga kerja, kesiapan struktur sosial, budaya dan regulasi. Artikel ini merupakan sebuah telaah pustaka (paper review) yang akan menjabarkan konsep Industry 4.0 serta melakukan analisis kemungkinan dampak implementasinya pada industri di Indonesia. Hasil telaah ini sangat diperlukan bagi Jurusan Teknik Mekatronika UNPAR dalam menyusun strategi jangka panjangnya, terutama pada perencanaan kurikulumnya, agar dapat menghasilkan lulusan yang sesuai dengan kebutuhan tenaga kerja dalam konsep Industry 4.0. Kata Kunci: industry 4.0, industri manufaktur, pendidikan tinggi, teknik mekatronika.
We provide a basic method of Smoothed Particle Hydrodynamics (SPH) to simulate liquid droplet wit... more We provide a basic method of Smoothed Particle Hydrodynamics (SPH) to simulate liquid droplet with surface tension in three dimensions. Liquid droplet is a simple case for surface tension modeling. Surface tension works only on fluid surface. In SPH method, we simply apply the surface tension on the boundary particles of liquid. The particle on the 3D boundary was detected dynamically using Free-Surface Detection algorithm. The normal vector and curvature of the boundary surface were calculated simultaneously with 3D boundary surface reconstruction using Moving Least-Squares (MLS) method. Before the reconstruction, the coordinate system was transformed into a local coordinate system. Afterwards, the surface tension force which depends on curvature of the surface, was calculated and applied on the boundary particles of the droplet. We present the simulation result of droplet motion with gravity force. By using the basic method of SPH for fluid modeling, and a combination of 3D Free-Surface Detection algorithm with MLS method, we can simulate droplet phenomena with expected result.
This paper presents the study and implementation of finite element method to find the temperature... more This paper presents the study and implementation of finite element method to find the temperature distribution in a rectangular cavity which contains a fluid substance. The fluid motion is driven by a sudden temperature difference applied to two opposite side walls of the cavity. The remaining walls were considered adiabatic. Fluid properties were assumed incompressible. The problem has been approached by two-dimensional transient conduction which applied on the heated sidewall and one-dimensional steady state convection-diffusion equation which applied inside the cavity. The parameters which investigated are time and velocity. These parameters were computed together with boundary conditions which result in temperature distribution in the cavity. The implementation of finite element method was resulted in algebraic equation which is in vector and matrix form. Therefore, MATLAB programs used to solve this algebraic equation. The final temperature distribution results were presented in contour map within the region.
A simple free-surface particle detection method for two and three-dimensional SPH simulation has ... more A simple free-surface particle detection method for two and three-dimensional SPH simulation has been implemented. The method uses sphere representation for the SPH particle. The fluid domain is covered by overlapping spheres. A sphere whose surface is not fully covered considered as boundary. To test particle boundary status, we used a sum of normalized relative position vectors from neighbouring particles to the test particle. By checking the existence of un- covered sphere surface by this vector sum, boundary status of the test particle can be determined. This boundary detection method can be easily embedded in the SPH solver algorithm.
This paper proposes a new model for Giant Magnetoresistance (GMR) and calculates its typical grap... more This paper proposes a new model for Giant Magnetoresistance (GMR) and calculates its typical graph qualitatively. The model's foundation is the microscopic mechanism in GMR, where the GMR effect can be explained by intrinsic and extrinsic potential. The potentials are spin-dependent. The potentials determine the transmission probability then it will give conductance value. Here, the multiple barrier potential model is proposed as the new GMR model. The transmission probability is determined using transfer matrix method. It was found that this model is fit qualitatively with the typical GMR graph.
The solidification behavior of liquid metal in a container under rapid cooling process is one of ... more The solidification behavior of liquid metal in a container under rapid cooling process is one of the major concerns to be analyzed. In order to analyze its fundamental behavior, a three- dimensional (3D) fluid dynamics simulation was developed using a particle-based method, known as the smoothed particle hydrodynamics (SPH) method. Governing equations that determine the fluid motion and heat transfer involving phase change process are solved by discretizing their gradient and Laplacian term with the moving particles and calculating the interaction with its neighboring particles. The results demonstrate that the SPH mehod can successfully reproduce the behavior and defect prediction of liquid metal solidification process.
In this paper, we applied an improved Smoothing Particle Hydrodynamics (SPH) method by using grad... more In this paper, we applied an improved Smoothing Particle Hydrodynamics (SPH) method by using gradient kernel renormalization in three-dimensional cases. The purpose of gradient kernel renormalization is to improve the accuracy of numerical simulation by improving gradient kernel approximation. This method is implemented for simulating free surface flows, in particular dam break case with rigid ball structures and the propagation of waves towards a slope in a rectangular tank.
This paper presents the study and implementation of finite element method to find the temperature... more This paper presents the study and implementation of finite element method to find the temperature distribution in a rectangular cavity which contains a fluid substance. The fluid motion is driven by a sudden temperature difference applied to two opposite side walls of the cavity. The remaining walls were considered adiabatic. Fluid properties were assumed incompressible. The problem has been approached by two-dimensional transient conduction which applied on the heated sidewall and one-dimensional steady state convection-diffusion equation which applied inside the cavity. The parameters which investigated are time and velocity. These parameters were computed together with boundary conditions which result in temperature distribution in the cavity. The implementation of finite element method was resulted in algebraic equation which is in vector and matrix form. Therefore, MATLAB programs used to solve this algebraic equation. The final temperature distribution results were presented i...
The present paper introduces stochastic velocity as improvement for moving particle semi-implicit... more The present paper introduces stochastic velocity as improvement for moving particle semi-implicit (MPS) method. This improvement is to overcome energy loss caused by numerical dissipation in the basic MPS that brings about rapid decay of waves. Stochastic velocity is added in the explicit step of the basic MPS method. MPS with stochastic improvement is compared with the basic method in the case of linear water waves, in particular dam break problem and standing wave in a rectangular tank. Surface detection and curve fitting are used to analyze the parameters of wave on the standing wave case. The surface detection and curved fitting was efficient to determine parameters of the wave and it was found that the stochastic improvement made the waves survived longer than in the basis method.
A simple free-surface particle detection method for two and three-dimensional SPH simulation has ... more A simple free-surface particle detection method for two and three-dimensional SPH simulation has been implemented. The method uses sphere representation for the SPH particle. The fluid domain is covered by overlapping spheres. A sphere whose surface is not fully covered considered as boundary. To test particle boundary status, we used a sum of normalized relative position vectors from neighbouring particles to the test particle. By checking the existence of un- covered sphere surface by this vector sum, boundary status of the test particle can be determined. This boundary detection method can be easily embedded in the SPH solver algorithm.
This paper proposes a new model for Giant Magnetoresistance (GMR) and calculates its typical grap... more This paper proposes a new model for Giant Magnetoresistance (GMR) and calculates its typical graph qualitatively. The model's foundation is the microscopic mechanism in GMR, where the GMR effect can be explained by intrinsic and extrinsic potential. The potentials are spin-dependent. The potentials determine the transmission probability then it will give conductance value. Here, the multiple barrier potential model is proposed as the new GMR model. The transmission probability is determined using transfer matrix method. It was found that this model is fit qualitatively with the typical GMR graph.
Monthly Notices of the Royal Astronomical Society, 2006
We present three dimensional smoothed particle hydrodynamics (SPH) calculations of warped accreti... more We present three dimensional smoothed particle hydrodynamics (SPH) calculations of warped accretion discs in X-ray binary systems. Geometrically thin, optically thick accretion discs are illuminated by a central radiation source. This illumination exerts a non-axisymmetric radiation pressure on the surface of the disc resulting in a torque that acts on the disc to induce a twist or warp. Initially planar discs are unstable to warping driven by the radiation torque and in general the warps also precess in a retrograde direction relative to the orbital flow. We simulate a number of X-ray binary systems which have different mass ratios using a number of different luminosities for each. Radiation-driven warping occurs for all systems simulated. For mass ratios q ∼ 0.1 a moderate warp occurs in the inner disc while the outer disc remains in the orbital plane (c.f. X 1916 − 053). For less extreme mass ratios the entire disc tilts out of the orbital plane (c.f. Her X-1). For discs that are tilted out of the orbital plane in which the outer edge material of the disc is precessing in a prograde direction we obtain both positive and negative superhumps simultaneously in the dissipation light curve (c.f. V603 Aql).
Dam is built for water supply, water flow or flooding control and electricity energy storage, but... more Dam is built for water supply, water flow or flooding control and electricity energy storage, but in other hand, dam is one of the most dangerous natural disaster in many countries including in Indonesia. The impact of dam break in neighbour area and is huge and many flooding in remote area, as happen in Dam Situ Gintung in Tangerang (close to Jakarta) in 2009. Smoothed Particle Hydrodynamics (SPH), is one of numerical method based on Lagrangian grid which is ap- plied in astrophysical simulation may be used to solve the simulation on dam break effect. The development of SPH methods become alternative methods to solving Navier Stokes equation, which is main key in fluid dynamic simulation. In this paper, SPH is developed for supporting solid par- ticles in use for 3D dam break effect (3D-DBE) simulation. Solid particle have been treated same as fluid particles with additional calculation for converting gained position became translation and rotation of solid object in a whole body. ...
Uploads
Papers by Christian Naa