Analysis of pulsation of the sliding-vane pump for selected settings of hydrostatic system

The magnetic-liquid double suspension bearing (MLDSB) is a new type of suspension bearing, with electromagnetic suspension as the main part and hydrostatic supports as the auxiliary part. It can greatly improve the bearing capacity and stiffness of rotor-bearing systems and is suitable for a medium speed, heavy load, and frequent starting occasions. Compared with the active electromagnetic bearing system, the traditional protective bearing device is replaced by the hydrostatic system in MLDSB, and the impact-rubbing phenomenon can be restrained and buffered. Thus, the probability and degree of friction and wear between the rotor and the magnetic pole are reduced drastically when the electromagnetic system fails. In order to explore the difference in the dynamic behavior law of the impact-rubbing phenomenon between the traditional protection device and hydrostatic system, the dynamic equations of the rotor impact-rubbing in three kinds of protection devices (fixed ring/deep groove ball bearing/hydrostatic system) under electromagnetic failure mode are established, and the axial trajectory and motion law of the rotor are numerically simulated. Finally, the dynamic behavior characteristics of the rotor are compared and analyzed. The results show that: Among the three kinds of protection devices (fixed ring/deep groove ball bearing/hydrostatic system), the hydrostatic system has the least influence on bouncing time, impact-rubbing force, and impact-rubbing degree, and the maximum impact-rubbing force of MLDSB is greatly reduced. Therefore, the protective bear is not required to be installed in the MLDSB. This study provides the basis for the theory of the “gap impact-rubbing” of MLDSB under electromagnetic failure, and helps to identify electromagnetic faults.

Download Full-text

Numerical simulation and experimental performance research of cylindrical vane pump

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/09544062211020037 ◽

2021 ◽

pp. 095440622110200

Author(s):

Yiqi Cheng ◽

Xinhua Wang ◽

Waheed Ur Rehman ◽

Tao Sun ◽

Hasan Shahzad ◽

...

Keyword(s):

Numerical Analysis ◽

Rotational Velocity ◽

Geometric Theory ◽

Mechanical Efficiency ◽

Operating Conditions ◽

Experimental Results ◽

Field Analysis ◽

Total Efficiency ◽

Three Dimensional Model ◽

Vane Pump

This study presents a novel cylindrical vane pump based on the traditional working principle. The efficiency of the cylindrical vane pump was verified by experimental validation and numerical analysis. Numerical analysis, such as kinematics analysis, was performed in Pro/Mechanism and unsteady flow-field analysis was performed using ANSYS FLUENT. The stator surface equations were derived using the geometric theory of the applied spatial triangulation function. A three-dimensional model of the cylindrical vane pump was established with the help of MATLAB and Pro/E. The kinematic analysis helped in developing kinematic equations for cylindrical vane pumps and proved the effectiveness of the structural design. The maximum inaccuracy error of the computational fluid dynamics (CFD) model was 5.7% compared with the experimental results, and the CFD results show that the structure of the pump was reasonable. An experimental test bench was developed, and the results were in excellent agreement with the numerical results of CFD. The experimental results show that the cylindrical vane pump satisfied the three-element design of a positive-displacement pump and the trend of changes in efficiency was the same for all types of efficiency under different operating conditions. Furthermore, the volumetric efficiency presented a nonlinear positive correlation with increased rotational velocity, the mechanical efficiency showed a nonlinear negative correlation, and the total efficiency first increased and then decreased. When the rotational velocity was 1.33[Formula: see text] and the discharge pressure was 0.68[Formula: see text], the total efficiency reached its maximum value.

Download Full-text

A Matrix FMEA Analysis of Variable Delivery Vane Pumps

Energies ◽

10.3390/en14061741 ◽

2021 ◽

Vol 14 (6) ◽

pp. 1741

Author(s):

Joanna Fabis-Domagala ◽

Mariusz Domagala ◽

Hassan Momeni

Keyword(s):

Risk Analysis ◽

Failure Modes ◽

High Reliability ◽

Matrix Analysis ◽

Hydraulic Systems ◽

Vane Pump ◽

End Effects ◽

Root Cause ◽

Preventative Measures ◽

Fmea Analysis

Hydraulic systems are widely used in the aeronautic, machinery, and energy industries. The functions that these systems perform require high reliability, which can be achieved by examining the causes of possible defects and failures and by taking appropriate preventative measures. One of the most popular methods used to achieve this goal is FMEA (Failure Modes and Effects Analysis), the foundations of which were developed and implemented in the early 1950s. It was systematized in the following years and practically implemented. It has also been standardized and implemented as one of the methods of the International Organization for Standardization (ISO) 9000 series standards on quality assurance and management. Apart from wide application, FMEA has a number of weaknesses, which undoubtedly include risk analysis based on the RPN (Risk Priority Number), which is evaluated as a product of severity, occurrence, and detection. In recent years, the risk analysis has been very often replaced by fuzzy logic. This study proposes the use of matrix analysis and statistical methods for performing simplified RCA (Root Cause Analysis) and for classification potential failures for a variable delivery vane pump. The presented methodology is an extension of matrix FMEA and allows for prioritizing potential failures and their causes in relation to functions performed by pump components, the end effects, and the defined symptoms of failure of the vane pump.

Download Full-text

Design and analysis of a sliding vane pump for waste heat to power conversion systems using organic fluids

Applied Thermal Engineering ◽

10.1016/j.applthermaleng.2017.06.083 ◽

2017 ◽

Vol 124 ◽

pp. 1038-1048 ◽

Cited By ~ 21

Author(s):

Giuseppe Bianchi ◽

Fabio Fatigati ◽

Stefano Murgia ◽

Roberto Cipollone

Keyword(s):

Waste Heat ◽

Power Conversion ◽

Vane Pump ◽

Organic Fluids

Download Full-text

Three in one: evolution of viviparity, coenocytic placenta and polyembryony in cyclostome bryozoans

BMC Ecology and Evolution ◽

10.1186/s12862-021-01775-z ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

U. A. Nekliudova ◽

T. F. Schwaha ◽

O. N. Kotenko ◽

D. Gruber ◽

N. Cyran ◽

...

Keyword(s):

Ultrastructural Study ◽

Main Part ◽

Structural Diversity ◽

Early Embryo ◽

Unique Combination ◽

Nutritive Tissue ◽

Pore Cells ◽

Secondary Embryos ◽

Cytoplasmic Bridges ◽

Hydrostatic System

Abstract Background Placentation has evolved multiple times among both chordates and invertebrates. Although they are structurally less complex, invertebrate placentae are much more diverse in their origin, development and position. Aquatic colonial suspension-feeders from the phylum Bryozoa acquired placental analogues multiple times, representing an outstanding example of their structural diversity and evolution. Among them, the clade Cyclostomata is the only one in which placentation is associated with viviparity and polyembryony—a unique combination not present in any other invertebrate group. Results The histological and ultrastructural study of the sexual polymorphic zooids (gonozooids) in two cyclostome species, Crisia eburnea and Crisiella producta, revealed embryos embedded in a placental analogue (nutritive tissue) with a unique structure—comprising coenocytes and solitary cells—previously unknown in animals. Coenocytes originate via nuclear multiplication and cytoplasmic growth among the cells surrounding the early embryo. This process also affects cells of the membranous sac, which initially serves as a hydrostatic system but later becomes main part of the placenta. The nutritive tissue is both highly dynamic, permanently rearranging its structure, and highly integrated with its coenocytic ‘elements’ being interconnected via cytoplasmic bridges and various cell contacts. This tissue shows evidence of both nutrient synthesis and transport (bidirectional transcytosis), supporting the enclosed multiple progeny. Growing primary embryo produces secondary embryos (via fission) that develop into larvae; both the secondary embyos and larvae show signs of endocytosis. Interzooidal communication pores are occupied by 1‒2 specialized pore-cells probably involved in the transport of nutrients between zooids. Conclusions Cyclostome nutritive tissue is currently the only known example of a coenocytic placental analogue, although syncytial ‘elements’ could potentially be formed in them too. Structurally and functionally (but not developmentally) the nutritive tissue can be compared with the syncytial placental analogues of certain invertebrates and chordates. Evolution of the cyclostome placenta, involving transformation of the hydrostatic apparatus (membranous sac) and change of its function to embryonic nourishment, is an example of exaptation that is rather widespread among matrotrophic bryozoans. We speculate that the acquisition of a highly advanced placenta providing massive nourishment might support the evolution of polyembryony in cyclostomes. In turn, massive and continuous embryonic production led to the evolution of enlarged incubating polymorphic gonozooids hosting multiple progeny.

Download Full-text

Rotary vane pump now with 1.5 m3/h flow

World Pumps ◽

10.1016/s0262-1762(05)70654-4 ◽

2005 ◽

Vol 2005 (467) ◽

pp. 7

Keyword(s):

Vane Pump ◽

Rotary Vane Pump

Download Full-text

Motion Performance Analysis and Experiment Research of the Hooke’s Joint-Gear Mechanism of Differential Velocity Vane Pump

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.588-589.309 ◽

2012 ◽

Vol 588-589 ◽

pp. 309-313

Author(s):

Ming Hu ◽

Wei Dong Yuan ◽

Wen Hua Chen ◽

Ming Chen ◽

Yao Zhang ◽

...

Keyword(s):

Performance Analysis ◽

Design Parameters ◽

Experiment Research ◽

Vane Pump ◽

Driving System ◽

Experimental Platform ◽

Gear Mechanism ◽

Motion Performance ◽

Hooke’S Joint

Based on the analysis of its motion performance about Hooke’s joint-gear mechanism, the Hooke’s joint-gear mechanism of differential velocity vane pump is brought forward. By analyzing its motion rule on the driving system of the differential velocity vane pump, the design parameters of the Hooke’s joint-gear mechanism of differential velocity vane pump are shown. The overall structure and its principle prototype are designed. Based on the principle prototype of the differential velocity vane pump, the experimental platform is established to testify the draining and trapping fluid. The results are shown that Hooke’s joint-gear mechanism of differential velocity vane pump can achieve the function of draining and aspirating fluid, and the design on the driving system and the pump structure are correct.

Download Full-text