US 2026/0098783 A1 · HYBRID HYDRAULIC-ELECTRODYNAMIC VIBRATION TEST SYSTEM

Abstract

A hybrid shaker system comprises two subsystems: a hydraulic shaker that generates vibrational movement mainly in a low frequency range, and an electrodynamic (ED) shaker that generates vibrations mainly in a high frequency range, with both contributing within a transitional intermediate frequency range. The shaker subsystems are connected in series so that cylinder piston rods of the hydraulic system drive the ED shaker housing, which in turn vibrates a unit-under-test (UUT). A single integrated vibration controller controls both the servo system of the hydraulic system and the power amplifier of the ED shaker using comparison of a target vibration profile with sensor feedback from the ED shaker housing and UUT. Vibrational movement of the UUT over a complete frequency range up to a few thousand kilohertz can be covered, while providing very large displacements up to 25 centimeters during the same test.

Claims19

Dependent claims

A hybrid vibration testing system, comprising:

a hydraulic shaker (HS) subsystem responsive to a first HS drive signal to provide a first component of vibration to a hydraulic shaker table;
an electrodynamic (ED) shaker subsystem with a housing that is mechanically coupled to the hydraulic shaker table and responsive to a second ED drive signal to add a second component of vibration onto an ED shaker table configured to support a unit-under-test (UUT);
and
a vibration control system, storing a user-specified target vibration profile and receiving real-time sensed vibration input signals as feedback from sensors on both the housing of the ED shaker subsystem and on the UUT, and with at least one processor configured to generate the first HS drive signal and the second ED drive signal such that vibration of the UUT matches the target vibration profile.

1 more element

A hybrid vibration method for use in a system having a hydraulic shaker (HS) subsystem and an electrodynamic (ED) shaker subsystem mechanically coupled in series to vibrate a unit-under-test (UUT), the method controlling the vibration contributions from both subsystems to match a stored user-specified target vibration profile, comprising:

providing a first HS drive signal and a second ED drive signal on parallel paths to respectively drive vibration movement contributions of the HS subsystem and ED shaker subsystem;
receiving real-time sensed vibration input signals as feedback from sensors on both a housing of the ED shaker subsystem and on the UUT;
generating by at least one processor in a common feedback control loop the first HS drive signal and the second ED drive signal, such that vibration of the UUT matches the stored target vibration profile.

Dependencies are inferred from the claim text.

Hybrid hydraulic-electrodynamic vibration test system

Life of this patent

Hybrid hydraulic-electrodynamic vibration test system

Life of this patent

Abstract

Claims19