Qhov Coupling nyhuv ntawm Clip Pressure Attenuation thiab Rail Pad Stiffness Deterioration
Yuav ua li cas nyob rau hauv -rail ncoo txhav degradation ua rau elastic clip preload lwj los ntawm coupling teebmeem?
Ib qho clip's preload pib los ntawm nws qhov kev teeb tsa ua ntej -deflection, nrog rau kev sib raug zoo ntawm kev ua ntej thiab deflection. Thaum lub ncoo txhav degrades (piv txwv li, nce compression teeb), ntsug rail hloov chaw nce, txo qhov clip qhov tseeb ua haujlwm deflection. Txo deflection ncaj qha txhais mus rau preload poob. Qhov tseem ceeb tshaj, preload poob amplifies rail kev co amplitude, uas nyob rau hauv lem accelerates pad nkees thiab nruj degradation. Qhov no coupling nyhuv-"softer pads loosen clips, xoob clips ntxiv soften pads"-accelerates preload lwj mus rau ntau tshaj peb zaug tus nqi ntawm ib zaug -factor teebmeem.
Qhov kev siv ntawm qhov sib txuas no sib txawv li cas ntawm ntau hom ntaub qhwv?
Nws yog qhov hnyav tshaj plaws hauv cov ntaub qhwv roj hmab, nws qhov tawv tawv yog qhov kub thiab txias (yuav ua rau tawv tawv lossis softening), nrog rau qhov tawv tawv hloov mus txog ± 40%, ua rau qhov siab tshaj plaws ua ntej tawg. Nws tsis muaj zog hauv cov ntaub qhwv polyurethane, uas ua rau muaj kev ruaj ntseg zoo heev (ntev- lub sij hawm hloov pauv tsawg dua lossis sib npaug li ± 10%), ua rau muaj txiaj ntsig zoo rau kev sib txuas. Hauv cov ntaub ntawv sib xyaw (piv txwv li, roj hmab + fiber ntau), qhov kev siv zog yog nruab nrab, tab sis interlayer delamination ua rau muaj kev hloov pauv hauv zos, ua rau muaj kev poob qis hauv zos preload.
Dab tsi cuam tshuam qhov ua tsis tiav ntawm preload thiab ncoo txhav muaj nyob rau hauv cov lus teb dynamic?
Coupled tsis ua hauj lwm ua rau "nonlinear mutations" nyob rau hauv txoj kab ntsug dynamic rigidness. Thaum lub caij tsheb ciav hlau hla, txoj kev taug kev tsis ruaj khov, ua rau lub siab tshaj plaws ntawm lub log -rail ntsug quab yuam thiab ua rau muaj kev pheej hmoo ntawm kev tsheb ciav hlau tawg thiab lub log flats. Meanwhile, tsis ruaj tsis khov preload txo tus khiav lub lateral restraint muaj peev xwm, ua rau ntau tshaj lateral rail hloov chaw ntawm curves thiab exacerbating sab hnav. Hauv cov chaw hloov pauv, xws li kev hloov pauv hloov pauv hloov pauv ncaj qha cuam tshuam lub tshuab ua haujlwm, ua rau lub teeb liab tsis ua haujlwm.
Yuav ua li cas kom tsis muaj zog no coupling nyhuv los ntawm "matching design" nyob rau hauv engineering?
Lub hauv paus ntawm kev tsim qauv yog kev sib koom ua ke ntawm "clip deflection reserve" thiab "pad stiffness design." Ua ntej cov ntaub qhwv nrog lub siab tawv tawv thiab ntev - lub sij hawm ruaj khov (xws li, polyurethane) ua lub hauv paus rau kev sib txuas ua ke. Ib txhij, xaiv cov clips nrog loj deflection reserves (piv txwv li, W-type, X-type), uas nws qhov chaw khiav hauj lwm nyob rau hauv nruab nrab ntawm lub elastic nkhaus txoj kab ib ntu. Qhov no ua kom ntseeg tau tias txawm tias cov ntaub qhwv ntsej muag tsis zoo, cov clip tseem nyob hauv qhov kev ua haujlwm zoo, txwv tsis pub dhau 15% thiab zam lub voj voog tsis zoo.
Yuav ua li cas txheeb xyuas cov cim qhia ntxov ntawm qhov ua tsis tiav no los ntawm kev sib koom ua ke ntawm -site?
Kev kuaj xyuas yuav tsum yog sib koom ua ke; Kev tshuaj xyuas tus kheej ntawm cov clips lossis cov ntaub qhwv tsis txaus. Ua ntej, siv lub torque wrench lossis nro ntsuas ntsuas los ntsuas qhov clip preload thiab kos qis - cov ntsiab lus preload. Tom qab ntawd, ua qhov kev ntsuam xyuas nruj (piv txwv li, portable poob ceeb thawj deflectometer) ntawm cov ntaub qhwv ntawm cov ntsiab lus no; Qhov tsis zoo ntawm qhov nruj heev qhia tau tias muaj kev pheej hmoo ua tsis tiav. Tsis tas li ntawd, saib rail-pad contact marks: "non-uniform contact" bright spots qhia tias lub hauv paus pad stiffness degradation tau ua rau tsis sib xws clip loading-ib qho kev qhia ntxov ntxov ntawm kev ua tsis tiav.