Shock absorber compression bench

Shock absorber compression bench

Client

Our client, specialized in the design, manufacturing and installation of equipment for civil engineering structures, consulted us in order to acquire a shock absorber compression bench.

 

Tested product: Shock absorber

The tested product is a shock absorber to reduce building oscillation during earthquakes.

The building is not directly connected to the ground. It is "placed" on pads that allow it to slide. The shock absorber is attached between the building and the ground and, as on a car, it reduces the amplitude of movement generated by earthquakes.

Example of seismic shock absorber installation

Example of seismic shock absorber installation

A shock absorber is a mechanical system designed to reduce the violence of a shock or the amplitude of its vibrations.

 

Seismic damper

Seismic damper

Car/motorcycle/quad shock absorber

Car/motorcycle/quad shock absorber

 

Objective

Characterize the maximum forces supported by our customer's seismic shock absorbers. The compression test bench must develop a force of 3,000 kN, (about 300 tonnes). The maximum length of a test product is 3,000 mm.

 

Problematic

Generating a force of 3,000 kN is not easy, but can be achieved with a specific hydraulic power unit and a custom cylinder.

The useful stroke of a shock absorber is close to its total length, but designing a cylinder capable of producing a force of 3,000 kN with a stroke of more than 1 metre is extremely complex, if not impossible.

 

Solution and results

The equipment proposed and designed by our teams is a horizontal shock absorber compression bench. It consists of a compression frame, a hydraulic cylinder, a movable crossbar, a remote-control panel and an electrical cabinet.

In order to reduce the cylinder stroke, LF Technologies has designed a mobile crossbar system, itself composed of 100 mm pitch notches, to adjust the length between the cylinder and the fixed part.

The cylinder is controlled by a hydraulic power unit allowing speed-controlled control of the compression cycle.

Toothed movable cross member

Toothed movable cross member

 

Adjustment of the toothed movable crossbar

Adjustment of the toothed movable crossbar

 

The machine is designed to be subjected to a force coaxial with the thrust of the hydraulic cylinder. A system of candles, positioned under the product, allows the shock absorber to be aligned with the thrust axis.

 

Product support candles

Product support candles

The machine is controlled by a PC equipped with software developed specifically by our programmers. Cycles can be programmed with position or force control, measurements and detector states can be displayed, etc.

 

Force control setting screen

Force control setting screen

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