Akontaabu akwan a wɔfa so yɛ kurukuruwa plain bearings .

Spherical plain bearings (SBPs) wɔ "fitting" spherical contact surfaces abien, contact bi a wonim no sɛ coordined contact. Akwan a wɔfa so bu akontaa ma SBP ahorow no mfiridwuma mu su ahorow no ho hia kɛse ma wɔn nhyehyɛe ne wɔn ho nhwehwɛmu. Contact pressure a wobebu so wɔ nneɛma a wɔayɛ no pɛpɛɛpɛ so no yɛ ɔhaw a emu yɛ den. Hertz model a ɛwɔ hɔ dada no, a ɛyɛ elastic fã-ahunmu no, ntumi mfa nni dwuma mfa nsusuw nhyɛso kyekyɛ wɔ spherical coordinated contacts so. A unified spherical contact model, FAng model, di asɛm a ɛfa contact pressure distribution ho wɔ spherical surfaces a ɛwɔ deformations nketewa so no ho dwuma yiye. Saa nhwɛsoɔ yi fa non{6}}a ɛne nkitahodiɛ hyia ne deɛ wɔayɛ no pɛpɛɛpɛ no nyinaa ho. Nanso, SBP bi nkitahodi beae no nyɛ kurukuruwa a edi mũ, enti ne nkitahodi nhyɛso kyekyɛ ho akontaabu hwehwɛ sɛ wobu akontaa foforo a egyina kurukuruwa a ɛyɛ pɛpɛɛpɛ a ɛne nkitahodi nhyehyɛe no hyia so. Bio nso, free boundary effects betumi aba bere a SBPs no reyɛ adwuma no, na ɛka wɔn dwumadie no. Saa free boundary effect yi ma contact pressure a ɛyɛ den ne nhyɛso kɛse a ɛkɔ soro wɔ SBP akyi ring no ano.