An Investigation of the Vibration Modes of an External Gear Pump through Experiments and Numerical Modeling

Abstract

This paper presents an experimental and numerical modal analysis for an external gear pump considering its mounting on a test rig in a laboratory setting. Most of the previous studies on experimental modal analysis (EMA) of hydraulic pumps focused on the modal frequencies to allow model validation. However, the mode shapes of pump bodies have not extensively been discussed. Furthermore, the nature of the pump components assembly and mounting poses some modeling challenges, such as the uncertain material properties of each component, the behavior of the bolted joints, and some critical modeling boundary conditions related to pump mounting. In this regard, the experimentally obtained vibration modes of a reference pump using the least-square complex exponential (LSCE) method are analyzed with an emphasis on the characteristics of the mode shapes. Then, simple modeling strategies are proposed and validated by performing the analysis from the component level to the full assembly. As a result, the mode shapes are categorized depending on the type of motions that the modes exhibit. It is observed that the pump casing does not show any substantial deformation but is close to the rigid body motion. Moreover, without considerably increasing model complexities, the proposed numerical approach provides reasonable accuracy with average errors in modal frequencies of 6%, as well as good agreement in terms of mode shapes. The vibration reduction strategy is briefly discussed based on the measured mode shapes, and the proposed modeling approaches can be useful to study external gear pumps with minimal model complexities yet allowing reasonable result accuracy.

Vibration characteristics analysis of a type of turbine disk-blade assembly system in the civil aero-engine

“…25 And the contact boundary conditions are closely related to the external loads, material properties, and component shape. 26 Three models can describe the contact boundary condition: the point-point model, point-surface model, and surface-surface model. For the turbine disk-blade structure, the surface-surface model is more appropriate.…”

Applied Methodology for Designing and Calculating a Family of Spur Gear Pumps

“…Here, ϕ-the rotation angle of the driving gear z 1 , D e = D e12 -the outer diameter of gears, calculated by using formula (11).…”

“…In recent years, many research papers have focused on conceiving hydraulic gear pumps to increase operating pressures [3,4], to extend the manufacturing range [4,5], to improve the efficiency in operation [6], to reduce pressure variations [3,7], the dynamic loads [8,9], weight [10], vibrations [11], etc.…”

“…Ref. [11] contains an experimental study and numerical modal analysis for an external gear pump mounted on a test stand in a laboratory setup. Many research works on experimental modal analysis of hydraulic gear pumps focus on the modal frequencies in order to approve the model validation.…”

“…Additionally, Ref. [11] discusses the vibration reduction strategy using the measured mode shapes and the proposed modeling approaches that can be useful for studying a large number of constructive solutions of external gear pumps, which may be of low model complexity but with a reasonable result accuracy.…”