Crash Energy Management Categories

Crash Energy Management is a vital part of Dellner's Train Connection Systems. We design our products to ensure passenger safety and train availability at all times.

Our crash energy management components are located in the front of a train and between the cars. Here, they help to handle the impacts of everyday train operations. In serious collisions they absorb energy from impact forces and stop carriages from twisting and climbing – potentially saving passengers' lives.​

Dellner train connection systems are therefore a key part of any comprehensive train safety management system.

We have developed our own simulation software, where we can test coupling, rescue towing and crash scenarios, as described by the crash standards. This enables us to find the most cost-effective to keep forces and accelerations at acceptable levels – saving lives, and preventing damage to the structure of the train.

  • Crash energy management is essential to meet relevant standards, such as EN 15227, and to enable high-speed coupling performance
  • The effect of a collision on a train depends on the behavior of the energy absorbers built into the couplers>
  • Whatever the impact conditions, the couplers should not bottom out, otherwise high deceleration will occur
  • Energy should be absorbed along the train, controlling impact forces between carriages, to reduce acceleration and deceleration at each position​
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Gas-hydraulic buffers and visco-elastic buffers

Gas-hydraulic buffers offer the best regenerative energy absorption at coupling and collision speeds. The buffer’s
characteristics can be adjusted so deceleration is always kept to a minimum.

Capacity

  • Stroke: 50-370mm
  • Force: 200-1500kN

Features

  • Fully reversible energy absorption up to intermediate speeds
  • Velocity sensitive
  • Keeps deceleration to a min​imum
  • 80% efficiency

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Rubber elements

​Rubber elements are a reliable and easy-to-maintain way to absorb energy reversibly.​


Capacity

  • Stroke: 7-50mm
  • Force: up to 1500kN

Features

  • Fully-reversible energy absorption up to moderate speeds
  • velocity sensitive
  • Keeps deceleration to a minimum
  • 50% efficiency

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Deformation tubes

Deformation tubes are a highly robust and efficient energy absorption component. The energy is absorbed by expanding (or collapsing) a tube over (by) a mandrel, creating a very repeatable structural plastic deformation, that together with the friction determines the deformation force. There is a small difference between force level from static and dynamic tests of deformation tube which indicates that it is not speed dependent.​


Capacity

  • Stroke: 50-1200mm​
  • Force: 200-2500kN

Features

  • Non-reversible energy absorption (must be replaced after use)
  • Non-velocity sensitive
  • 10​0% efficiency

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Crash boxes

​Crash boxes offer a very high energy absorption capacity. They work parallel to the coupler, and are typically combined with anti-climbers for optimal structural collapse, because they are not designed to transfer high vertical and lateral loads.​


Capacity​

  • Stroke: 50-1000mm​​
  • Force: 200-3000kN

Features

  • Non-reversible energy absorption (must be replaced after use)
  • Non-velocity sensitive
  • Close to 100% efficiency
  • Absorbs residual impact after initial collision
  • Shape can vary to fit the space available
  • Release/shear bolts ensure the coupler releases in a controlled manner and pushes through the train pocket without interf ring with crash boxes, or the structure of th​e cab

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Override protection

Override protection components must be able to withstand high bending moments created by vertical offset loading, to keep the train on the track. They can work parallel to the coupler, and will typically engage only after its deformation tube stroke and coupler release have been fully used. A stabilizing function can also be built into the draft gear.


Capacity

  • Stroke: 50-750mm
  • Force: 200-2500kN

Features

  • Choice of reversible, non-reversible, and combined energy absorption
  • Non-velocity sensitive (non-reversible absorb ers) or velocity sensitive (reversible absorbers/combined)
  • 70-100% efficiency

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