The Experts below are selected from a list of 3636 Experts worldwide ranked by ideXlab platform
K. Dasgupta - One of the best experts on this subject based on the ideXlab platform.
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dynamic analysis of proportional solenoid controlled piloted Relief Valve by bondgraph
Simulation Modelling Practice and Theory, 2005Co-Authors: K. Dasgupta, J. WattonAbstract:Abstract In this article dynamics of a proportional controlled piloted Relief Valve have been studied through Bondgraph simulation technique. The governing equations of the system have been derived from the model. While solving the system equations numerically, various pressure-flow characteristics across the Valve ports and the orifices are taken into consideration. The simulation study identifies some critical parameters, which have significant effect on the transient response of the system. The simulation results are also verified with experimental results. [The static and dynamic characteristics of a pressure Relief Valve with a proportional solenoid-controlled pilot stage, IMechE, Part I, Journal of Systems and Control Engineering, 216 (2002) 143–156.]
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modelling and dynamics of single stage pressure Relief Valve with directional damping
Simulation Modelling Practice and Theory, 2002Co-Authors: K. Dasgupta, R. KarmakarAbstract:Abstract The dynamics of a direct operated Relief Valve with directional damping have been studied through Bondgraph simulation technique. The governing equations of the system have been derived from the Bondgraph model. While solving the system equations numerically, the pressure-flow characteristics of the Valve port and the damper unit have been taken into consideration. From this study, some significant parameters of the Valve response are identified, which can be modified to improve the dynamic characteristics of the Valve.
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Dynamic analysis of pilot operated pressure Relief Valve
Simulation Modelling Practice and Theory, 2002Co-Authors: K. Dasgupta, R. KarmakarAbstract:Abstract In this article the dynamics of a pilot operated pressure Relief Valve have been studied through Bondgraph simulation technique. The governing equations of the system have been derived from the model. While solving the system equations numerically, the various pressure-flow characteristics of the Valve ports are taken into consideration. The simulation study identifies some critical design parameters, which have significant effect on the transient response of the system.
J. Watton - One of the best experts on this subject based on the ideXlab platform.
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dynamic analysis of proportional solenoid controlled piloted Relief Valve by bondgraph
Simulation Modelling Practice and Theory, 2005Co-Authors: K. Dasgupta, J. WattonAbstract:Abstract In this article dynamics of a proportional controlled piloted Relief Valve have been studied through Bondgraph simulation technique. The governing equations of the system have been derived from the model. While solving the system equations numerically, various pressure-flow characteristics across the Valve ports and the orifices are taken into consideration. The simulation study identifies some critical parameters, which have significant effect on the transient response of the system. The simulation results are also verified with experimental results. [The static and dynamic characteristics of a pressure Relief Valve with a proportional solenoid-controlled pilot stage, IMechE, Part I, Journal of Systems and Control Engineering, 216 (2002) 143–156.]
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the static and dynamic characteristics of a pressure Relief Valve with a proportional solenoid controlled pilot stage
Proceedings of the Institution of Mechanical Engineers Part I: Journal of Systems and Control Engineering, 2002Co-Authors: Rathindranath Maiti, Rana Saha, J. WattonAbstract:AbstractThe steady state and dynamic characteristics of a two-stage pressure Relief Valve with proportional solenoid control of the pilot stage is studied theoretically as well as experimentally. The mathematical model is studied within the MATLAB-SIMULINK environment and the non-linearities have been considered via the use of appropriate SIMULINK blocks. The detailed modelling has resulted in a good comparison between simulation and measurement, albeit assumptions had to be made regarding the solenoid dynamic characteristic based upon practical experience. The use of this characteristic combined with additional dynamic terms not previously considered allows new estimations of internal characteristics to be made such as the damping flowrate. The overall dynamic behaviour has been shown to be dominated by the solenoid characteristic relating force to applied voltage.
R. Karmakar - One of the best experts on this subject based on the ideXlab platform.
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modelling and dynamics of single stage pressure Relief Valve with directional damping
Simulation Modelling Practice and Theory, 2002Co-Authors: K. Dasgupta, R. KarmakarAbstract:Abstract The dynamics of a direct operated Relief Valve with directional damping have been studied through Bondgraph simulation technique. The governing equations of the system have been derived from the Bondgraph model. While solving the system equations numerically, the pressure-flow characteristics of the Valve port and the damper unit have been taken into consideration. From this study, some significant parameters of the Valve response are identified, which can be modified to improve the dynamic characteristics of the Valve.
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Dynamic analysis of pilot operated pressure Relief Valve
Simulation Modelling Practice and Theory, 2002Co-Authors: K. Dasgupta, R. KarmakarAbstract:Abstract In this article the dynamics of a pilot operated pressure Relief Valve have been studied through Bondgraph simulation technique. The governing equations of the system have been derived from the model. While solving the system equations numerically, the various pressure-flow characteristics of the Valve ports are taken into consideration. The simulation study identifies some critical design parameters, which have significant effect on the transient response of the system.
Srigokul Upadhyayula - One of the best experts on this subject based on the ideXlab platform.
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lamellar projections in the endolymphatic sac act as a Relief Valve to regulate inner ear pressure
eLife, 2018Co-Authors: Ian A Swinburne, Kishore R Mosaliganti, Srigokul Upadhyayula, Tsungli Liu, David G C Hildebrand, Tony Y C Tsai, Anzhi Chen, Ebaa AlobeidiAbstract:The most internal part of the human ear, the inner ear, is essential for us to hear and have a sense of balance. It is formed by a complex series of connected cavities filled by a liquid. When sound waves and changes in the position of the body make this liquid move, specialized ‘hair’ cells can detect these subtle movements; neurons then relay this information to the brain where it is decoded and interpreted. For the inner ear to work properly, the body needs to finely regulate the pressure created by the liquid inside the cavities. For example, people with unstable pressure in their ears can experience deafness or problems with balance. A structure known as the endolymphatic sac, which is a balloon-like chamber connected to the rest of the inner ear by a thin tube, helps with this regulation. However, scientists are still unsure about how exactly the sac performs its role. One problem is that the inner ear is difficult to study because it is encased in one of the densest bones in the body. Many other animals also have inner ears, from fish to birds and mammals. Here, Swinburne et al. examine the inner ear of zebrafish embryos because, in this fish, the ear starts working before the bones around it form; the structure is therefore accessible for injections and microscopy. Experiments show that when the pressure in the inner ear rises, the endolymphatic sac slowly fills up with the ear liquid, and then it rapidly deflates. Fish with mutations that stop the sac from deflating have overinflated sacs, which is a symptom also found in certain patients with hearing and balance disorders. Looking into the details of these inflation-deflation cycles, Swinburne et al. found that the cells that form the sac have gaps between them, unlike a normal sheet of cells. A flap covers these gaps to keep the liquid in, but under pressure, the flap opens and the liquid can escape. These results show that the endolymphatic sac works as a pressure Relief Valve for the inner ear. Ultimately, understanding how pressure is regulated in the ear could help patients with inner ear disorders. It could also serve as a template to investigate how eyes, kidneys and the brain, which all have liquid-filled cavities, control their internal pressure.
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lamellar junctions in the endolymphatic sac act as a Relief Valve to regulate inner ear pressure
bioRxiv, 2017Co-Authors: Ian A Swinburne, Kishore R Mosaliganti, Srigokul Upadhyayula, Tsungli Liu, David G C Hildebrand, Tony Y C Tsai, Anzhi Chen, Ebaa Alobeidi, Anna K Fass, Samir MalhotraAbstract:The inner ear is a fluid-filled closed-epithelial structure whose normal function requires maintenance of an internal hydrostatic pressure and fluid composition by unknown mechanisms. The endolymphatic sac (ES) is a dead-end epithelial tube connected to the inner ear. ES defects can cause distended ear tissue, a pathology often seen in hearing and balance disorders. Using live imaging of zebrafish larvae, we reveal that the ES undergoes cycles of slow pressure-driven inflation followed by rapid deflation every 1-3 hours. Using serial-section electron microscopy and adaptive optics lattice light-sheet microscopy, we find a pressure Relief Valve in the ES comprised of thin overlapping basal lamellae that dynamically extend over neighboring cells before rupturing under pressure leading to ES collapse. The unexpected discovery of a physical Relief Valve in the ear emphasizes the need for further study into how organs control fluid pressure, volume, flow, and ion homeostasis in development and disease.
Tomy, Dwi Nugroho - One of the best experts on this subject based on the ideXlab platform.
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IDENTIFIKASI KERUSAKAN PRESSURE Relief Valve PADA TANGKI MUATAN GAS DI MT. GAS KALIMANTAN
2018Co-Authors: Tomy, Dwi NugrohoAbstract:Tomy Dwi Nugroho, NIT.51145485.T, 2018 “Identify damage of pressure Relief Valve on gas carrier in MT. GAS KALIMANTAN ", Program of Diploma IV, , Marchant Marine Polytechnic of Semarang, 1st Supervision: Achmad Wahyudiono. M.M. , M.Mar.E and 2nd Supervision: Poernomo Dwi Atmojo. SH. MH. Pressure Relief Valve is an instrument that works when there is overpressure on the inlet nozzle. In the design to be open proportionally when there is an abnormal (in this case (over pressure) on a plant and will close when the plant back to normal (normal pressure). Mean of Damage pressure Relief Valve in here is, the pressure Relief Valve not closed back after the pressure is drop when the tank is overpressure. The method used in this thesis is.fishbone analysis and fault tree analysis. The method as to determine the problem factors and events that exist in the problem. The problem formulation of this research is. The cause of damage to the Relief Valve, how the impact caused from the damage of the Relief Valve on the cargo tank, and how the handling efforts to be done to overcome the damage to the Relief Valve. Based on the results of this study concluded that the cause of damage to the pressure Relief Valve is a leakage on the pilot supply line and accompanied by the increase in pressure in the tank of the estuary due to the thermal expansion (heat expansion). The impacts of the causal factors are the loss of cargo evaporating the air and the damage of supporting equipment in the cargo tank, and the attempts to avoid and handle the event are by routine checks and maintenance. And if the incident happens immediately do the closure manually after the pressure decreases. That is, by pushing the seat cover using nitrogen gas on the nozzle located in the body pressure Relief Valve. Key Words :Identification, Damage, Pressure Relief valv
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Tidak menutupnya pressure Relief Valve pada tangki muatan gas setelah over pressure di MT. Gas Kalimantan
2018Co-Authors: Tomy, Dwi NugrohoAbstract:Pressure Relief Valve adalah sebuah alat instrument yang bekerja saat adanya over pressure pada inlet nozzle. Di desain untuk terbuka secara proporsional saat adanya abnormal (dalam hal ini over pressure) pada sebuah plant dan akan menutup saat plant kembali normal (normalpressure). Kerusakan pressure Relief Valve disini adalah tidak menutupnya kembali pressure Relief Valve setelah terjadi over pressure. Metode yang digunakan dalam skripsi ini adalah metode fishbone analysis dan fault tree analysis sebagai metode untuk menentukan faktor permasalahan dan event-event yang ada pada permasalahan. Adapun rumusan masalah dari penelitian ini adalah . Penyebab rusaknya Relief Valve, bagaimana dampak yang di timbulkan dari akibat rusaknya Relief Valve pada tangki cargo, bagaimana upaya penanganan yang harus dilakukan untuk mengatasi kerusakan pada Relief Valve. Berdasarkan hasil penelitian ini disimpulkan bahwa penyebab kerusakan pada pressure Relief Valve adalah adanya kebocoran pada pilot supply line dan di sertai oleh naiknya tekanan di dalam tangki muaan karena adanya thermal expansion (ekspansi panas). Dampak yang terjadi dari faktor penyebab tersebut adalah hilangnya muatan yang menguap keudara serta rusaknya peralatan-peralatan pendukung pada tangki muatan, dan upaya yang dilakukan untuk mengindari sekaligus menangani kejadian tersebut adalah dengan melakukan pengecekan dan perawatan rutin. Dan apabila terjadi kejadian tersebut segera lakukan penutupan secara manual setelah tekanan menurun yaitu, dengan mendorong seat penutup menggunakan gas nitrogen pada nozzle yang berada di body pressure Relief Valve Kata Kunci : Identifikasi, Kerusakan, Pressure Relief valv
