TRI-AXIAL EXCITATION DEVICE

The illustrated device contains three contra-rotating weights each capable of being individually operated to provide vibration in the X, Y and Z directions.  The device is waterproof and is positively located down the hole using the inflatable tyre.  It is designed for use down pre-drilled bore holes at a depth up to 5 metres. 

PADDLE MIXER SHAFT REMOVAL DOLLY

The shell of a 58' long paddle mixer was too thin to support the weight of the 18 tonne, 1.5 m diameter shaft and paddles by using the usual methods of a wheeled dolly or tracks.   A unique air-lifting dolly, comprising of two wedge shaped sections was designed to allow installation through small access panels in the end faces of the drier. The two sections made out of composite material were coupled together and supplied with compressed air at 1 bar.  Despite the short timescale between order placement and delivery, the device was designed and built, ready for the commissioning of the drier.

FOUR-POINT-BEND RIG

A leading renewable energy company had a three-point-bend test rig capable of performing static tests used to develop structures used in wind-turbine blades.  They wished to upgrade their testing abilities to include a four-point-bend rig capable of performing both static and fatigue tests.   The engineers at DC White & Partners designed, substantiated and built the rig in time for the planned tests.

TOWER DAMPERS

The tower structure supporting the vent flue for the newly built building was a tubular steel structure having a triangular plan section and was to be mounted on the roof of the building.  There was a concern that it could be excited by wind turbulence on a site which is closely surrounded by taller buildings.  The tower was subjected to finite element analysis to determine the mode shapes. These shapes were confirmed using on-site testing both before and after damper installation.  Three passive dampers designed by DC White & Partners and manufactured by Altoona Ltd were installed at approximately two-thirds of the tower’s height.