Optimization of the interference parameters of an Orbit motor using genetic algorithm

Nag, Abhijit; Ramachandran, Harish; Shriwastava, Aditya

doi:10.1177/0954406220924700

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…A feasible trade-off between the rotor torque and ripple is proposed with respect to pivotal parameters that affect the problem. Nag and Harish et al [19] investigated interference parameters of an Orbit motor rotor system. Their main objectives were to determine interference effects between the rotor and stator to identify further unbalanced torque reduction potential by the application of GA.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization of a small scale SCO₂ turbine rotor system with a shaft cooler

Gurgenci

Guan

et al. 2022

Mechanics & Industry

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The SCO2 turbine machines exchange energy through supercritical carbon dioxide. Their impeller has the features of high-temperature and −speed to enhance energy conversion efficiency, but the rotor needs to be cooled to be compatible with bearings and seals. The paper introduces a pivotal parameter optimization of a concentrating solar SCO2 turbine rotor and seeks to control the harmonic response amplitude while preserving the distance between the critical speed and the working speed. The optimization considers several parameters including bearing span, stiffness, effective mass and damping of the bearing hub, and gas film stiffness coefficients of the cooler. The optimization is accomplished using a multi-objective and −scale quantum harmonic oscillator algorithm (mMQHOA) that couples an information interaction algorithm and transfer matrix model. The application of information interaction accelerates the convergence speed of the objective functions. The verification results from the three-dimensional finite element (3D-FE) indicate that the non-dominant design reduces resonance amplitude of the disc by approximately 71.91%, while the critical frequency increases by about 34.33% in the direction away from the operating frequency, and imply a trade-off relationship between harmonic response amplitude and critical speed. It is further reveal that the increased gas film stiffness of cooler in the primary level interval (<1E6 N/m) has no significant effect on the harmonic response of the system. The optimization is based not only on the analysis of design parameters, but also focuses on the sensitivity of objective functions that can significantly affect dynamic performance. The models with a single variable of bearing span and film stiffness are investigated respectively, and then the sensitivity of the system response is analyzed. In addition, three different objective functions are proposed, with the purpose of constructing a universally applicable model that can be further used to optimize the analogous bearing rotor system.

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Section: Introductionmentioning

confidence: 99%

Multi-objective optimization of a small scale SCO₂ turbine rotor system with a shaft cooler

Gurgenci

Guan

et al. 2022

Mechanics & Industry

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“…The analysis is limited to a gerotor pump at a specific speed. Further, Nag et al 33 have optimized the interference parameters for the rotating axis LSHT ROPIMA to produce no gap between stator and rotor through a genetic algorithm.…”

Section: Introductionmentioning

confidence: 99%

Inter-chamber leakage flow through the transition contacts in epitrochoid generated star and ring hydrostatic units

Pradhan

Sahoo

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The current study examines the impact of tooth clearance on the flow performance at the location of transition contact of the internal positive displacement trochoidal gear pump. The aim is to enhance the volumetric efficiency, which is caused by internal leakage due to tooth clearance. Two clearance models, that is, form closed and interference (forced closed) models of the pump help to elucidate the leakage phenomenon through which optimal volumetric efficiency can be achieved. Finite element investigation comprises the static structural analysis followed by 3D CFD analysis carried out for the study. The CFD model includes the contact deformations of external trochoidal gear due to the application of maximum pressure, which increases the inter-chamber leakage. Fluid velocity and pressure inside the pump have been predicated to understand the flow dynamics inside the pump. The simulation results were matched to theoretical values, and this shows a very excellent match. The volumetric efficiency of 89% with less than 1 gm/s of leakage has been achieved at a speed of 2500 rpm. Moreover, the simulation results show an increase in discharge flow with the interference model. Further, an empirical relation is established between volumetric efficiency, fluid density, and rotor speed using partial least square regression analysis.

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Flow Characteristics of Gerotor Motors With Pin and Nonpin Designs

Hsieh

Johar

Lin

2022

Journal of Fluids Engineering

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The geometric design of a gerotor motor has a significant impact on its function, performance, quality, reliability and cost. When designing a gerotor motor all these features must be considered. A gerotor motor can be classified into two types based on the geometric design; gerolor (pin design) and gerotor (nonpin design). In this article geometric parameters of the two design types are discussed briefly and the operation of the gerotor motor is described as well. A numerical analysis is carried out by using computational fluid dynamics (CFD) tool (PumpLinx) to analyze the fluid flow and predict the performance of both types of gerotor designs. Various characteristics of the two designs of the gerotor motor are investigated and compared which include the gerotor design, fluid flow rate, velocity, pressure and output torque. Comparison of the results found out that using pin design gerotor motor, the flow rate, flow velocity, pressure and torque will vary greatly. Nonpin design can significantly reduce variations in all the flow characteristics thereby enhancing the stability and reduction in the leakage risk.

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Optimization of the interference parameters of an Orbit motor using genetic algorithm

Cited by 4 publications

References 26 publications

Multi-objective optimization of a small scale SCO₂ turbine rotor system with a shaft cooler

Multi-objective optimization of a small scale SCO₂ turbine rotor system with a shaft cooler

Inter-chamber leakage flow through the transition contacts in epitrochoid generated star and ring hydrostatic units

Flow Characteristics of Gerotor Motors With Pin and Nonpin Designs

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Optimization of the interference parameters of an Orbit motor using genetic algorithm

Cited by 4 publications

References 26 publications

Multi-objective optimization of a small scale SCO2 turbine rotor system with a shaft cooler

Multi-objective optimization of a small scale SCO2 turbine rotor system with a shaft cooler

Inter-chamber leakage flow through the transition contacts in epitrochoid generated star and ring hydrostatic units

Flow Characteristics of Gerotor Motors With Pin and Nonpin Designs

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Product

Resources

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Multi-objective optimization of a small scale SCO₂ turbine rotor system with a shaft cooler

Multi-objective optimization of a small scale SCO₂ turbine rotor system with a shaft cooler