May 16, 2020

Pressure Hydraulics Cork recognised as Irelands first Bosch Rexroth training centre

bosch rexroth
pressure hydraulics cork
Ireland
Manufacturing
Admin
2 min
Pressure Hydraulics Cork recognised as Ireland's first Bosch Rexroth training centre
Bosch Rexroth has announcedPressure Hydraulics Cork(PHC) as its Authorised Training Centre, with its official certificate of accreditation presented on...

Bosch Rexroth has announced Pressure Hydraulics Cork (PHC) as its Authorised Training Centre, with its official certificate of accreditation presented on the 18th March 2016.

Based in Cork, PHC is the only facility in Ireland to be recognised as an Authorised Training Centre by Bosch Rexroth.

Ireland‘s leading supplier of hydraulic valves, pumps and filters demonstrated exceptional standards, from equipment quality through to delivery of training, in order to achieve the much sought after accreditation.

The trusted partner of Bosch Rexroth, has been providing training on industrial hydraulics and controls for three years and plans to grow its training offer to the Irish market with a focus on bespoke courses for its customers, tailored to suit individual requirements.

Jim Hickey, Managing Director at Pressure Hydraulics Cork, said: “Being the only Bosch Rexroth Authorised Training Centre in Ireland is a significant achievement and something we are very proud of. We‘ve worked really hard to obtain this title and we aim to continue maintaining this standard.”

Jim continued: “The Irish manufacturing industry is doing really well right now after experiencing an increase in new orders and a faster rate of expansion over the last six months. Our site in Cork will be a great support for companies in Ireland looking to train individuals to the best of their ability, from beginners through to experienced engineers.”

The facility has a dedicated training room complete with Bosch Rexroth training rigs, offering a hands-on experience. As well as this, the on-site trainer is also Bosch Rexroth approved. The certified tutors are a mixture of current Field Service Engineers, Application Engineers and Test Engineers with personal access to a vast amount of practical understanding and real-life experience. With the aim to provide current product knowledge and trends in the industry, which is vital in the ever changing industrial climate.

Andrew Collins, Operations Director at Bosch Rexroth, commented: “All our accredited training facilities and trainers have to meet various criteria before achieving accreditation. The results from these rigorous assessments mean, we can now ascertain that Pressure Hydraulics Cork provides the best quality training, from equipment through to personnel. The accreditation is not only great for Pressure Hydraulics Cork but also for Ireland as a whole.”

Pressure Hydraulics Cork’s training facility has been validated as an Authorised Training Centre from the 1st March 2016, and an official presentation of the certificate took place 18 March 2016.

For more information on Pressure Hydraulics Cork and the training it provides, click here.

 

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Jun 17, 2021

Why engineers must always consider human-induced vibration

Vibrations
Engineering
design
Structuralintegrity
Dominic Ellis
3 min
Human-induced vibration can lead to a number of effects upon the structure and its users

Human induced vibration, or more accurately vibrations caused by human footfall, often conjures images of Millennium Bridge-style swaying or collapsing buildings.

But in reality, the ‘damage’ caused by human-induced vibrations is less likely to ruin a structure and more likely to cause discomfort in people. Though not as dramatic as a structural failure, any good engineer wants to make sure the people using their structures, be it bridges or buildings or anything in between, can do so safely and comfortably. This is why human-induced vibration must be considered within the design process.

Resonance v Impulse

There are two ways that human-induced vibrations affect structures: resonant, and impulse or transient response. Put simply, resonance occurs when Object A vibrates at the same natural frequency as Object B.

Object B resonates and begins to vibrate too. Think singing to break a wine glass! Although the person singing isn’t touching the glass, the vibrations of their voice are resonating with the glass’s natural frequency, causing this vibration to get stronger and stronger and eventually, break the glass. In the case of a structure, resonance occurs when the pedestrian’s feet land in time with the vibration.

On the other hand, impulse or transient vibration responses can be a problem on structures where its natural frequencies are too high for resonance to occur, such as where the structure is light or stiff. Here the discomfort is caused by the initial “bounce” of the structure caused by the footstep and is a concern on light or stiff structures.

Engineers must, of course, design to reduce the vibration effects caused by either impulse or resonance.

Potential impacts from human induced vibration

Human induced vibration can lead to a number of effects upon the structure and its users. These include:

  • Interfering with sensitive equipment Depending on the building’s purpose, what it houses can be affected by the vibrations of people using the building. Universities and laboratories, for example, may have sensitive equipment whose accuracy and performance could be damaged by vibrations. Even in ordinary offices the footfall vibration can wobble computer screens, upsetting the workers.
     
  • Swaying bridges One of the most famous examples of human-induced resonance impacting a structure occurred with the Millennium Bridge. As people walked across the bridge, the footsteps caused the bridge to sway, and everybody had to walk in time with the sway because it was difficult not to. Thankfully, this feedback can only occur with horizontal vibrations so building floors are safe from it, but footbridges need careful checking to prevent it.
     
  • Human discomfort According to research, vibrations in buildings and structures can cause depression and even motion sickness in inhabitants. Tall buildings sway in the wind and footsteps can be felt, even subconsciously by the occupants. It has been argued that modern efficient designs featuring thinner floor slabs and wider spacing in column design mean that these new builds are not as effective at dampening vibrations as older buildings are.
     
  • Jeopardising structural integrity The build-up of constant vibrations on a structure can, eventually, lead to structural integrity being compromised. A worse-case scenario would be the complete collapse of the structure and is the reason some bridges insist that marching troops break step before crossing. Crowds jumping in time to music or in response to a goal in a stadium are also dynamic loads that might damage an under-designed structure.

How to avoid it

As mentioned, modern designs that favour thinner slabs and wider column spacing are particularly susceptible to all forms of vibration, human-induced or otherwise, but short spans can also suffer due to their low mass. Using sophisticated structural engineering software is an effective method for engineers to test for and mitigate footfall and other vibrations at the design stage.

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