The Czechs are still good tram builders and very adept at recycling trams!
Tony P
On Monday, 11 September 2023 at 13:04:53 UTC+10 Hal Cain wrote:
> But sometimes the design work proves inadequate in practice -- on the
> train railway, consider the now-notorious yaw damper failures on new UK
> trains designed and built by Hitachi and by CAF; it turned out IIRC that
> the frame members to which the yaw damper brackets are attached weren't
> strong enough to resist the constantly varying forces from the dampers
> attached to the bogies. The design engineers, under pressure to
> reduce material and mass to the bare minimum, cut it too fine. Fatigue and
> materials science in the practical world...
>
> Hal Cain
>
> On Mon, Sep 11, 2023 at 11:50 AMpeterm...@... peterm...@...>
> wrote:
>
>> A computer model is only as good as the data fed into it. Garbage in
>> Garbage out. The skill is in the engineer checking via other methods that
>> the model is giving sensible results. Usually working it out from first
>> principles.
>>
>> On Friday, 8 September 2023 at 16:56:59 UTC+10 Matthew Geier wrote:
>>
>>> Just proves that even with all modern computing tools at a
>>> structural engineer's disposal, you will need to have some 'feel' for the
>>> craft.
>>>
>>> Engineers are graduating from Uni these days with blind faith in
>>> computer models. They are wizards at using CAD programs. However, they
>>> don't appear to have any 'feel for the art'. And faced with their design
>>> failing in the field they will argue that reality is wrong as the computer
>>> model said it would work.
>>> The engineering school I work for had this issue - they had a subject
>>> where the students used CAD to design a simple pump. The twist was they
>>> then got the mech workshop to make them. A significant number didn't
>>> actually work. Apparently, the students complained about being marked down
>>> when the physical item didn't work properly! The subject was primarily a
>>> CAD subject, the pump build was intended to demonstrate the limitations of
>>> computer models. Too many students just 'didn't get it'.
>>>
>>>
>>>
>>>
>>> On Fri, 8 Sept 2023 at 08:42, Mal Rowe mal....@...> wrote:
>>>
>>>> On 08/09/2023 16:37, Matthew Geier wrote:
>>>> > If they design for 20 years, you can expect expensive structural
>>>> > augmentation will be needed at 20 years.
>>>>
>>>> Unless the designers worked for Siemens or CAF!
>>>>
>>>>
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>>>>
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>