DETERMINING THE STRENGTH OF A FRAME IN A RAILROAD OPEN WAGON WITH SLINGS IN ITS STRUCTURE TO IMPROVE ITS OPERATIONAL ENERGY EFFICIENCY. - Lovska, Alyona; Stanovska, Iraida; Pelypenko, Yevhen; Barsukova, Hanna; Yurchenko, Oleksandr (Eastern-European Journal of Enterprise Technologies, 2025)