ข้อมูลผลงานวิจัย

The modification of a railway passenger coach involves structural changes to

the roof and the side wall to support the installation of a rooftop air-conditioning unit.

The modified structure requires verification of its structural integrity to ensure safe

operation. This verification is conducted in accordance with the European standard EN

12663, which defines the structural requirements for railway vehicle bodies. The

assessment is carried out using finite element analysis, focusing on static load cases

relevant to the modified area. Total of six static load cases were analyzed including

proof loads representing the structural effects of forces acting on the air-conditioning

unit attachment due to acceleration in the positive and negative x-, y-, and z-directions.

The analyses reveal that high-stress areas across all scenarios are predominantly located

at the connection between the newly installed crossbeam supporting the air-conditioning

unit and the longitudinal cant rail of the original passenger coach structure. Among these

scenarios, the load case involving acceleration in the negative x-direction (braking)

produced the highest von Mises stress of 207.4 MPa. This stress remains below the

material’s yield strength, ensuring a safety margin against plastic deformation under the

applied loading conditions. The remaining load cases also result in stresses within the

allowable range, confirming structural adequacy across all scenarios. In summary, the

modified passenger coach meets the relevant structural requirements defined in EN

12663 standard concerning static. The structure exhibits no permanent deformation

under the specified static load cases, confirming the structural adequacy of the

modifications.