Aron Hurley

AronHurley’s Power Amplifiers use compact and extremely efficient power modules. These help to amplify the small electrical signal from the Vibration Controller to a proportionally high voltage and high current output, that is ideal to drive the shaker. The design of the Power Amplifier ensures energy and space. DSA series Power Amplifier use solid-state power devices in a Class-D Full Bridge configuration. They are digitally modulated with a high frequency pulse width modulated signal with efficiency of over 92%. Their modular construction makes them easy to handle and arrange for maximum output power with direct coupling to any resistive or inductive load. Integral air cooled design ensures continuous duty cycle without sacrificing performance at peak temperature and humidity.

These Power Amplifiers are compatible with any make of Electrodynamic Shakers and are designed to provide continuous rated voltage and current at high ambient temperature and humidity. A low knee filter provides smooth output, while removing switching noise and electromagnetic interference. A zobel network is dedicated for impedance matching over a wide range of frequencies for inductive loads. Adjustable current limit is also provided for controlling maximum output power so that accidents can be avoided.

Assembled in industry standard modular racks, all modules of our Power Amplifier are rack mountable. Removing and installing modules is made easy via guide rails on which every module is designed to slide. Designed to meet international design and safety standards, every module of our Power Amplifier is feature rich and contains its own power entry, power filtering, error indication and EMI conforming systems. Continuous upgrade of technology to better meet the international standards and reduce the carbon footprint of our system is a never-ending process at Sdyn. Through our various training, services and maintenance programs, we keep our customers updated with the latest product offerings and upgrades.

Major Sub Systems of the Power Amplifier are:

The microcontroller based Digital Logic Unit (DLU) controls and monitors the system features and safety interlocks of the DSA series Power Amplifier. The logic unit acts as a user friendly interface between the user and the equipment and can be operated both in manual and auto modes.

System parameters and trip interlocks are displayed on the alphanumeric display of the feather touch membrane keyboard front panel. Soft start and controlled shut down is offered with an online key on the front panel.

Shaker and amplifier safety interlocks are monitored and indicated on the front panel through a microcontroller chip. Interlock signals are routed through isolators and buffer network for proper latching and to prevent false triggering.

The signals are latched on to the fault analysis section of the microcontroller. Only after all faults are resolved, the system is allowed to go Online and increase the gain. Major system interlocks associated with DSA series of amplifier are over current, field fail, displacement limit, cooling shaker, over temperature, etc.

Major Sub Systems of the Digital Logic Unit are:

Internal Oscillator
The internal oscillator is a feature provided in the DLU for manual mode of operations wherein the g level is not controlled. The output of the internal oscillator is a pure sine wave. Its gain is controlled via the feather touch membrane keyboard front panel. Output voltage, current and frequency are displayed on the alphanumeric display.

The oscillator is capable of producing sine wave from 1Hz to 10kHz.

Signal Source Selection
As the DLU can generate its own sine signal in addition to the external signal from a Vibration Controller, it features a signal source selection that allows users to seamlessly switch between internal and external signal source using the feather touch membrane keyboard front panel. The selectable signal path offers negligible resistance and ensures signal integrity.

Gain Control
The highly integrated gain control block of the DLU is designed using a digital potentiometer. All changes in gain are made gradually, one step at a time, to prevent any spike or sudden movement of the armature. Clamp and release operation is done automatically by the microcontroller inside the DLU based upon various inputs from the user and the interlocks.

Auto Centring
All shakers from Sdyn have dynamic auto centring. Models SEV 125 to SEV 180 feature mechanical auto centring. Models SEV 240 to SEV 760 feature a combination of mechanical and electronic auto centring. The mechanical auto centring is based on rubber bushes and cam bolt assemblies, which exhibit mechanical stiffness when the armature is at its centre. The electronic auto centring is based on optical sensors that centre the armature by filling or releasing air from a cup below the armature structure.

For long stroke systems which require displacement of more than 51mm or 2 inch, a highly sophisticated laser based auto centring is provided. The suspension system of a long stroke system is different and offers no stiffness whatsoever. Therefore, this auto centring system controls pneumatics and DC output from the amplifier, in order to ensure the system achieves its centre with varied test loads.