The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Zhongdong Qian - One of the best experts on this subject based on the ideXlab platform.
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Mechanical and Magnetic Excitations in Hydraulic Machinery
Vibration of Hydraulic Machinery, 2013Co-Authors: Shuhong Liu, Hua-shu Dou, Zhongdong QianAbstract:Mechanical analysis of Hydraulic Machinery includes two fields, structural dynamics and rotor dynamics. Structural dynamics is a subset that covers areas of structural behavior subjected to dynamic loading. Rotordynamics is a specialized branch of applied mechanics concerned with the behavior and diagnosis of rotating structures.
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Rotordynamic Simulation of Hydraulic Machinery
Vibration of Hydraulic Machinery, 2013Co-Authors: Shuhong Liu, Hua-shu Dou, Zhongdong QianAbstract:The shaft stability of generating and pumping units plays a crucial role on the units’ operation: It directly affects the safe operation and also influences the life of units.
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Structural Dynamic Analysis in Hydraulic Machinery
Vibration of Hydraulic Machinery, 2013Co-Authors: Shuhong Liu, Hua-shu Dou, Zhongdong QianAbstract:The study of structural dynamics focuses on a structure’s behaviour when it is subjected to dynamic loading. Dynamic analysis can be used to research dynamic displacements, time-history, and modal analysis. A static load is one that does not vary, whereas a dynamic load changes with time. If it changes slowly, the structure’s response may be determined with static analysis. However, if it varies quickly, the response must be determined with dynamic analysis. Dynamic analysis for simple structures can be carried out manually, but for complex structures, FEM can be applied to calculate the mode shapes and frequencies.
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Vibration Induced by Hydraulic Excitation
Vibration of Hydraulic Machinery, 2013Co-Authors: Shuhong Liu, Hua-shu Dou, Zhongdong QianAbstract:Generally, Hydraulic excitations that induce vibrations in Hydraulic Machinery can be categorized as follows:
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Instability of System Caused by Hydraulic Machinery
Vibration of Hydraulic Machinery, 2013Co-Authors: Shuhong Liu, Hua-shu Dou, Zhongdong QianAbstract:This chapter mainly focuses on the instability of Hydraulic turbine system. The stability of pumping system and the nonlinear models of Hydraulic turbine system transient in hydro power plants are also introduced.
Shuhong Liu - One of the best experts on this subject based on the ideXlab platform.
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Mechanical and Magnetic Excitations in Hydraulic Machinery
Vibration of Hydraulic Machinery, 2013Co-Authors: Shuhong Liu, Hua-shu Dou, Zhongdong QianAbstract:Mechanical analysis of Hydraulic Machinery includes two fields, structural dynamics and rotor dynamics. Structural dynamics is a subset that covers areas of structural behavior subjected to dynamic loading. Rotordynamics is a specialized branch of applied mechanics concerned with the behavior and diagnosis of rotating structures.
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Rotordynamic Simulation of Hydraulic Machinery
Vibration of Hydraulic Machinery, 2013Co-Authors: Shuhong Liu, Hua-shu Dou, Zhongdong QianAbstract:The shaft stability of generating and pumping units plays a crucial role on the units’ operation: It directly affects the safe operation and also influences the life of units.
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Structural Dynamic Analysis in Hydraulic Machinery
Vibration of Hydraulic Machinery, 2013Co-Authors: Shuhong Liu, Hua-shu Dou, Zhongdong QianAbstract:The study of structural dynamics focuses on a structure’s behaviour when it is subjected to dynamic loading. Dynamic analysis can be used to research dynamic displacements, time-history, and modal analysis. A static load is one that does not vary, whereas a dynamic load changes with time. If it changes slowly, the structure’s response may be determined with static analysis. However, if it varies quickly, the response must be determined with dynamic analysis. Dynamic analysis for simple structures can be carried out manually, but for complex structures, FEM can be applied to calculate the mode shapes and frequencies.
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Vibration Induced by Hydraulic Excitation
Vibration of Hydraulic Machinery, 2013Co-Authors: Shuhong Liu, Hua-shu Dou, Zhongdong QianAbstract:Generally, Hydraulic excitations that induce vibrations in Hydraulic Machinery can be categorized as follows:
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Instability of System Caused by Hydraulic Machinery
Vibration of Hydraulic Machinery, 2013Co-Authors: Shuhong Liu, Hua-shu Dou, Zhongdong QianAbstract:This chapter mainly focuses on the instability of Hydraulic turbine system. The stability of pumping system and the nonlinear models of Hydraulic turbine system transient in hydro power plants are also introduced.
Ioan Sarbu - One of the best experts on this subject based on the ideXlab platform.
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Numerical modeling of cavitation characteristics and sensitivity curves for reversible Hydraulic Machinery
Engineering Analysis with Boundary Elements, 2014Co-Authors: Anton Iosif, Ioan SarbuAbstract:Abstract Details on the existence, extent and effects of cavitation can be helpful during the design stages of Hydraulic Machinery to minimize the effects of cavitation and optimize the design. Fluid flow in reversible Hydraulic Machinery elements is a complex three-dimensional problem. In this paper, an explicit numerical model based on finite element method (FEM) - dual reciprocity method (DRM) coupling is developed for the 2D simulation of the flow velocity and pressure distributions on the runner blade of a Francis-type reversible radial-axial Hydraulic machine. The model is based on the assumptions of an ideal incompressible fluid and relative rotational motion. Instead of directly simulating the 3D flow, the proposed model is based on the analysis of specific 2D flows: fluid axial-symmetric motion and the stream function in an associated plane. This model is applied to reversible radial–axial Hydraulic Machinery that operates as a pump. The blade exhibits the basic profile NP205. The skeleton of this profile is defined by a quadratic equation, and its thickness function exhibits a NACA profile with a maximum relative thickness of five percent. The numerical results for different discharge values can be used to determine the cavitation characteristics and sensitivity curves for reversible Hydraulic Machinery.
Hua-shu Dou - One of the best experts on this subject based on the ideXlab platform.
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Mechanical and Magnetic Excitations in Hydraulic Machinery
Vibration of Hydraulic Machinery, 2013Co-Authors: Shuhong Liu, Hua-shu Dou, Zhongdong QianAbstract:Mechanical analysis of Hydraulic Machinery includes two fields, structural dynamics and rotor dynamics. Structural dynamics is a subset that covers areas of structural behavior subjected to dynamic loading. Rotordynamics is a specialized branch of applied mechanics concerned with the behavior and diagnosis of rotating structures.
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Rotordynamic Simulation of Hydraulic Machinery
Vibration of Hydraulic Machinery, 2013Co-Authors: Shuhong Liu, Hua-shu Dou, Zhongdong QianAbstract:The shaft stability of generating and pumping units plays a crucial role on the units’ operation: It directly affects the safe operation and also influences the life of units.
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Structural Dynamic Analysis in Hydraulic Machinery
Vibration of Hydraulic Machinery, 2013Co-Authors: Shuhong Liu, Hua-shu Dou, Zhongdong QianAbstract:The study of structural dynamics focuses on a structure’s behaviour when it is subjected to dynamic loading. Dynamic analysis can be used to research dynamic displacements, time-history, and modal analysis. A static load is one that does not vary, whereas a dynamic load changes with time. If it changes slowly, the structure’s response may be determined with static analysis. However, if it varies quickly, the response must be determined with dynamic analysis. Dynamic analysis for simple structures can be carried out manually, but for complex structures, FEM can be applied to calculate the mode shapes and frequencies.
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Vibration Induced by Hydraulic Excitation
Vibration of Hydraulic Machinery, 2013Co-Authors: Shuhong Liu, Hua-shu Dou, Zhongdong QianAbstract:Generally, Hydraulic excitations that induce vibrations in Hydraulic Machinery can be categorized as follows:
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Instability of System Caused by Hydraulic Machinery
Vibration of Hydraulic Machinery, 2013Co-Authors: Shuhong Liu, Hua-shu Dou, Zhongdong QianAbstract:This chapter mainly focuses on the instability of Hydraulic turbine system. The stability of pumping system and the nonlinear models of Hydraulic turbine system transient in hydro power plants are also introduced.
Alejandro Toro - One of the best experts on this subject based on the ideXlab platform.
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slurry erosion of thermal spray coatings and stainless steels for Hydraulic Machinery
Wear, 2007Co-Authors: J F Santa, J C Baena, Alejandro ToroAbstract:Abstract The slurry erosion of two coatings applied by oxy fuel powder (OFP) and wire arc spraying (WAS) processes onto sand-blasted AISI 304 steel was studied, and the results were compared to those obtained with AISI 431 and ASTM A743 grade CA6NM stainless steels, which are commonly used for Hydraulic turbines and accessories. The adherence of the coatings to the substrate was measured according to ASTM C 633 standard, while the microstructure and worn surfaces were characterized by optical and scanning electron microscopy. Slurry erosion tests were carried out in a modified centrifugal pump, in which the samples were placed conveniently to ensure grazing incidence of the particles. The slurry was composed of distilled water and quartz sand particles with an average diameter between 212 and 300 μm (AFS 50/70) and the solids content was 10 wt% in all the tests. The mean impact velocity of the slurry was 5.5 m/s and the erosion resistance was determined from the volume loss results. The coated surfaces showed higher erosion resistance than the uncoated stainless steels, with the lower volume losses measured for the E-C 29123 deposit. SEM analysis of the worn surfaces revealed intense plastic deformation in both coated and bare stainless steels, with little evidence of brittle fracture in the microstructure. The measured adhesive strength of the coatings was considered acceptable for the processes employed.
