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In the present investigation, an analysis is carried out in FEM simulation software (Ansys ®), to predict the deformations and gaps at active contacts in cycloidal class toothed starring of ORBIT ® motor. Detailed geometries and kinematic of ORBIT motor are included in the modeling. Following Maiti's assumptions in earlier investigation, the outer...
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Lumped parameter approaches for the description of the flow displaced by hydrostatic pumps and motors have proven to be very effective for both analysis and design purposes. However, while these methods are relatively easy to implement for most of the existing design architectures for positive displacement machines, the case of a crescent-type inte...
Citations
... A discovery to experimentally evaluate flow characteristics in hydrostatic pump work has been noted by. [27][28][29][30][31] Recently, Roy et al. 32 have done leakage flow investigation at different angular positions of pump rotors using CFD and photo imaging techniques. The analysis is limited to a gerotor pump at a specific speed. ...
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.
... However, in these investigations, they have not focused on the gaps or deformations created at transition active contacts due to fluid pressure which plays a crucial role in improving efficiency of GEROTOR unit. In the recent past, Roy [21,22] have established an FEM approach in Ansys® environment for estimating the deformations and gaps at active contact in ORBIT motors. Assigning accurate boundary conditions, the FEM results, after transforming into dimensionless form (and vice versa), are found to have very good matching with results obtained by Maiti's TEM approach. ...
The aim of this present investigation is to estimate the generated contact stresses, deformations and gaps at all ideally form-closed active contacts of GEROTOR® pump (a unique HSLT hydrostatic unit) during operation. These analyses have been done for one complete cycle of the star-ring set of GEROTOR pump considering splined shaft as an input of applied torque. During operation, direct measurement of these deformations and gaps is not an easy task as the contact positions are inaccessible to equip any measuring device. Therefore, accurate theoretical estimation of these deformations and gaps is targeted. As there are multiple contacts, the problem is statically indeterminate type. The first part of the paper shows the details of analytical approaches and the related results. In the second part, the numerical approaches basically FEM have been used to model and solve this type of problem. In both the analytical and numerical approaches, model has been developed with proper accurate and realistic boundary conditions and loading arrangements. These are elaborately presented in this paper. Also, the combined sliding and rolling velocities of contact points of star-ring set have been shown here.
