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MR Fluid Shock Pallet with Bimodal Operation Disclosure Number: IPCOM000249309D
Publication Date: 2017-Feb-16
Document File: 2 page(s) / 71K

Publishing Venue

The Prior Art Database


An MR fluid shock pallet with bimodal operation enabling rack shipping of servers is disclosed.

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MR Fluid Shock Pallet with Bimodal Operation

Disclosed is a MR fluid shock pallet with bimodal operation enabling rack shipping of servers. Rack shipping is notoriously difficult due to the shock and vibration loads that servers loaded in racks must survive. The forces are transmitted into the rack pallet, to the rack frame, and finally to the very edges of the server via the rails. This makes for poor load paths that encourage high displacement in the center of the system.

An active shock pallet is disclosed that utilizes a central control unit to dynamically control the viscosity of magneto rheological (MR) fluid within piston style sprung dampeners. The pallet includes multi directional shock/vibration dampening through the use of multiple MR Fluid dampeners and a control scheme that also stiffens individual dampeners in response to steady state loading to prevent tipping. MR fluid dampeners are a proven technology found in high end and military vehicle suspensions and engine mounts – the novel portion of this invention is the application within a shipping pallet and the dual operation modes.

The MR Fluid shock pallet includes of a set of MR Fluid dampeners, a control unit, a battery, and at least one input to detect loading environment and signal the control unit to utilize the appropriate mode (shock and vibration dampening vs tip resistance).

The MR Fluid dampeners can be any of several styles and arranged in several different ways – these are known entities with documented performance metrics. The most common MR fluid dampener resembles a typical spring shock in a vehicle suspension – the key difference is that electrical signals are piped into a solenoid disposed in the piston head. By modulating the electrical input the magnetic field generated in the piston head can be controlled. MR Fluid is essentially a suspension of nano sized iron particles within a liquid carrier; outside the presence of a magnetic field, the suspension has a relatively low viscosity and flows easily. As a magnetic field is applied to the fluid, the iron particles clump and bind together, drastically increasing the viscosity of the suspension. Within the piston head, this has the effect of giving the control system precise control over displacement and velocity of the piston head as it reacts to an external loading environment. This technology is extremely effective at dampening shock and vibration over a very wide range of amplitudes and frequencies and since it is a dynamic control system, it is always optimized to exact shock/vibration input.

A single MR fluid dampener between a load bearing platform and the pallet would allow for only shock and vibration dampening. As the shock pulse came into the pallet, the control system would modulate the electric signals to the dampener to reduce the severity of shock/vibration transferred to the rack. Linear bearings disposed between the pallet and the platform would help to reduce tipping.

Placing two MR Fluid dam...