"Modelov\u00E1n\u00ED vibrac\u00ED potrub\u00ED s prot\u00E9kaj\u00EDc\u00ED kapalinou"@cs . . "Z\u00E1pado\u010Desk\u00E1 univerzita v Plzni" . . "Plze\u0148" . "80-7082-999-0" . . "4"^^ . . . . "Using finite element method tube elements were derived with respect of flowing fluid inside. Extra coefficients are added to mass, damping and stiffness matrices of regular tube elements. These coefficients respect influence of the flowing fluid. As a test system was used straight tube 3 metres long divided into 10 elements. Results show the flow velocity must be very high (hundrets of $\\frac{m}{s}$) to have significant effect. For normal flow velocities the flow velocity doesn't need to be res pected. This applies for straight tubes only. Model for knees and open ends is currently under developnemt."@en . "Pomoci metody kone\u010Dn\u00FDch prvk\u016F bylo modelov\u00E1no proud\u011Bn\u00ED kapaliny uvnit\u0159 potrub\u00ED a zji\u0161\u0165ov\u00E1n vliv jeho rychlosti na vlastn\u00ED frekvence potrub\u00ED. Kapalina byla modelov\u00E1na jako posouvaj\u00EDc\u00ED se hmota, kter\u00E1 je pops\u00E1na p\u0159\u00EDdavn\u00FDmi \u010Dleny do matic hmotnosti, tuhost i a tlumen\u00ED. Pro testov\u00E1n\u00ED byl vybr\u00E1n model p\u0159\u00EDm\u00E9ho \u00FAseku potrub\u00ED o d\u00E9lce 3 metry. Z v\u00FDsledk\u016F vypl\u00FDv\u00E1, \u017Ee vliv rychlosti kapaliny na hodnoty vlastn\u00EDch frekvenc\u00ED je velmi mal\u00FD a pro b\u011B\u017En\u00E9 rychlosti proud\u011Bn\u00ED je mo\u017En\u00E9 ho zanedbat. Je p\u0159edpoklad, \u017Ee pro pot rub\u00ED se slo\u017Eit\u011Bj\u0161\u00ED geometri\u00ED (kolena, ventily, ...) bude vliv rychlosti proud\u00EDc\u00EDho m\u00E9dia v\u00FDrazn\u011B vy\u0161\u0161\u00ED." . "K\u00E1\u0148a, Josef" . "V\u00FDpo\u010Dtov\u00E1 mechanika 2003" . "vibration;tube;flow;FEM"@en . . . "2003-11-03+01:00"^^ . "23520" . . "Z(MSM 235200003)" . . . "Modelling tube vibration with respecting flow velocity"@en . . . . "Modelov\u00E1n\u00ED vibrac\u00ED potrub\u00ED s prot\u00E9kaj\u00EDc\u00ED kapalinou" . "0"^^ . "0"^^ . "2"^^ . "RIV/49777513:23520/03:00000229!RIV/2004/MSM/235204/N" . . "616047" . "Modelling tube vibration with respecting flow velocity"@en . "Modelov\u00E1n\u00ED vibrac\u00ED potrub\u00ED s prot\u00E9kaj\u00EDc\u00ED kapalinou"@cs . . "Modelov\u00E1n\u00ED vibrac\u00ED potrub\u00ED s prot\u00E9kaj\u00EDc\u00ED kapalinou" . "171-174" . "2"^^ . "[0782647E6301]" . "RIV/49777513:23520/03:00000229" . . "Dupal, Jan" . "Ne\u010Dtiny" . .