SignalForce – Inertial and Modal Shakers
The M series of modal shakers use linear bearings, in place of the more common suspension systems, to produce virtually zero axial stiffness and virtually zero mechanical damping. When combined with Data Physics’ linear amplifiers, operating in current mode, the resultant system force output will exhibit typically less than 1% electrical damping and the phase shift between drive current and force output will be typically less than 1°.
When large structures need to be tested, inertial shakers provide the ideal solution. The central spigot is attached to the structure under test and the body then provides the inertial mass. These shakers have found applications for testing buildings, floor loading resonances, ship’s decks for helicopter loading, squeaks and rattle testing in cars, geological exploration, helicopter rotor simulation and active vibration cancellation.

Inertial Shakers
Testing of large structures can often present considerable difficulties, so when the payload can’t be mounted on the shaker Data Physics can provide a shaker that can be mounted on the payload. Inertial shakers are fully enclosed, permanent magnet shakers that can be mounted on to structures at any angle – they are entirely self-supporting. Inertial shakers have found applications testing car chassis, building structures, ships’ flight decks, helicopters, submarines, geophysical surveys and vibration cancellation systems.
Force outputs from 30N to 250N
Tunable suspension to produce peak force at low resonant frequencies
Options for cooling by airline or by standard blowers

Modal Shakers
The Modal shaker series exhibits almost zero axial stiffness, while offering very high radial stiffness for stability. This performance combination is achieved through the use of a linear guidance bearing. There are 6 models of modal shakers with a total of 10 variants. Previous applications include the testing of airframes, space lab structures, automotive chassis, road surfacing materials and artificial limb joints.
Force outputs from 49N to 12
Bearing guidance
Virtually zero axial stiffness

Inertial Shakers

Structural excitation of large structures can often present considerable challenges.
The Data Physics line of inertial shakers can be mounted onto a large mechanical or civil structure to generate forces for dynamic responsemeasurements. The inertial shakers can also be used for active noise cancellation applications. Inertial shakers are completely self-supporting and can be mounted onto the structures at any angle.
The central spigots are connected to the structure and the shaker body provides the inertial mass.
• Force outputs from 6.7 lbf (30 N) to 56.2 lbf (250 N)
• Tunable suspension to produce peak force at low resonant frequencies
• Convection cooled, with options for direct airline or standard blower cooling

Modal Shakers

Modal shakers are used to excite a structure via the central spigot with a connecting rod (stinger) so that energy can be input without the mass or dynamics of the shaker affecting the response of the structure. Modal shakers exhibit almost zero axial stiffness through the use of a linear guidance bearing. They also bear no load and have no suspension system.
Modal shakers are used to test airframes, space lab structures, automotive chassis, road surfacing materials and even artificial limb joints.
• Force outputs from 11 lbf (49 N) to 475 lbf (2 kN)
• Linear bearing guidance
• Virtually zero axial stiffness