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Pots vibrants

Gamme complète de pots modaux et inertiels avec amplificateurs intégrés, faciles à utiliser. Les pots à aimants permanents Dewesoft sont des excitateurs universels compacts, légers et puissants, utilisés pour les essais modaux et de vibration. Ils ont une capacité élevée malgré leurs petites tailles.

Caractéristiques principales

  • AMPLIFICATEUR INTÉGRÉ: Les pots PM-20, PM-100, MS-20 and MS-100 ont des amplificateurs intégrés. Il suffit de brancher le câble et le shaker est prêt à fonctionner.
  • GÉNÉRATEUR DE FONCTIONS INTÉGRÉ: En plus d'avoir un amplificateur intégré, les pots PM-20, PM-100, MS-20 et MS-100 ont également un générateur de fonctions intégré. Bien entendu, vous pouvez également générer un signal d'une sortie analogique à partir du système SIRIUS DAQ, mais cette option vous permet de réaliser des essais simples pour comprendre leur comportement structurel du spécimen d'essais.
  • FIXATIONS PIVOTANTES ET POIGNÉES: Tous les shakers MS et PM ont des fixations pivotantes et des poignées pour les positionner dans n'importe quelle orientation et position.
  • ÉCRAN INTÉGRÉ: Cette fonctionnalité ne peut être utilisée qu'avec un générateur de fontions intégré. Il affiche la fréquence du signal généré et permet ainsi de régler le vibrateur sur une plage de fréquence entre 1 Hz et 15 kHz. Il est alors possible de voir le comportement de la structure sous excitation très précise en fréquence.
  • AMPLIFICATEUR COMPACT POUR POTS INERTIELS: Tous les pots inertiels utilisent le même amplificateur ultra compact. Cet amplificateur est également capable de générer des signaux sinusoïdaux et utilisé par des vibrateurs tiers. Extrêmement compact, cet amplificateur tout-en-un peut générer des signaux personnalisés tels que du bruit blanc ou rose ou d'autres formes d'ondes.

Permanent Magnet Shaker

Dewesoft permanent magnet shakers are compact, lightweight and powerful general-purpose shakers which can be used for modal and vibration testing. They have high DUT capacity despite their small sizes. DYN-PM-20 and PM-100 have an integrated amplifier and a sine wave signal generator where the frequency can be adjusted from 1 Hz to 15,000Hz.

Advantages:

  • Lightweight, durable, portable and easy to use
  • Adjustable trunnion base provides a high degree of flexibility
  • Broad frequency range
  • Embedded power amplifier and signal generator for PM-20 and PM-100

Applications for PM Shakers

Permanent Magnet shakers are used for Vibration testing and Shock testing:

  • Vibration testing of micro parts, assemblies, and electronics Modal testing
  • Shock testing
  • Sensor calibration
  • Separation and compacting of powders
  • Fatigue and resonance testing
  • Velocity transducer or high-speed actuator
  • Mechanical impedance measurement
  • Education and research

Modal Shakers

Modal testing can be performed with modal hammers or shakers. If high-frequency excitation content or signal controlled testing is desired, then modal shakers are the only excitation solution. Dewesoft modal shakers are lightweight and powerful modal shakers which can go up to 15,000 Hz and provide force levels up to 440N with a maximum 25mm stroke.

Advantages:

  • Modal stinger can be easily adjusted by the through-hole armature
  • Lightweight, durable, portable and easy to use
  • Adjustable trunnion base provides high flexibility
  • Up to 25mm stroke and broad frequency range

Applications for Modal Shakers

Modal shakers can be used for Modal testing and Structural Dynamics. 

The series of Dewesoft modal shakers covers a wide range of structures for dynamic characterization from electronic boards and sub-components to machinery, vehicles and aircraft, even constructions.

  • Components, Machinery, Vehicles, Aircraft, and constructions
  • Aerospace and
  • Automotive

Modal Testing is a prerequisite for design and product validation in aerospace and automotive industries as well as many others.

Inertial Shakers

The shakers used in modal testing and in-flight tests of aircraft are usually electrodynamic shakers. However, the traditional shakers are not very portable and the attachment process takes time. Dewesoft inertial shakers are easily mounted and have great mobility. It can be used as a handheld.

Advantages:

  • Compact and lightweight design
  • Superior low-frequency performance
  • Any angle mounting
  • Low friction bearing guided

Applications for Inertial Shakers

Inertial shakers are used for Vibration and Modal testing. Inertial shakers are used for testing car chassis, squeaks and rattle testing in cars, civil engineering prototype testing, building structures, floor loading resonances, ships’ flight decks, helicopters rotor simulation, submarines, geophysical surveys, and vibration cancellation systems.

  • Civil engineering
  • Automotive
  • Aerospace
  • Shipbuilding
  • Education and research

Modal Test

In real life applications, machine parts and mechanical systems are rarely under static loading. Most of the time they are excited by dynamic loads. The structure responds to these dynamic loads according to its dynamic parameters such as natural frequencies and mode shapes. Therefore, an engineer has to have a solid insight into the dynamic behaviour of the structure which has been designed. The process of finding the dynamic behaviour of a structure is called structural system identification.

Structural system identification consists of finding the transfer function of the system which is established by finding the modal parameters of the structure such as, natural frequencies, damping, modal vectors, and residues.

The transfer functions of a structure can be obtained by mathematical modelling or by experimental methods. The experimental way to obtain the transfer function of a structure is achieved by measuring the response of the structure to a measured input. The responses are generally acceleration and the inputs or excitations are generally impulses or random/sine signals.

More information on the Modal Analysis application page.

Modal Test

The impulse signal is easily generated by a modal hammer with a force transducer attached at its tip. The random or sine signal excitation requires modal shakers. Moreover, if high-frequency excitation content or signal controlled testing is desired, then modal shakers are the only excitation solution. Dewesoft modal shakers are lightweight and powerful modal shakers which can go up to 15,000 Hz and provide force levels up to 440N with a maximum 25mm stroke.

The modal shaker is attached to the structure and the desired excitation signal is applied to the structure via a signal generator. In the meantime, the responses of the structure are
measured and Frequency Response Functions are calculated which are used in the Modal Analysis calculations.

More information on the Modal Analysis application page.

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