ʻO nā mea hoʻoheheʻe wai viscous he mau mea hydraulic e hoʻopau ai i ka ikehu kinetic o nā hanana seismic a pale i ka hopena ma waena o nā hale.Hiki iā lākou ke hoʻolālā a hiki ke hoʻolālā ʻia e ʻae i ka neʻe manuahi a me ka hoʻopaʻa ʻia ʻana o kahi hale e pale aku ai i ka ukana makani, ka neʻe wela a i ʻole nā hanana seismic.
ʻO ka damper fluid viscous he ʻaila cylinder, piston, piston rod, lining, medium, pin head a me nā ʻāpana nui ʻē aʻe.Hiki i ka piston ke hana i ka neʻe pānaʻi i loko o ka pahu aila.Hoʻolako ʻia ka piston me ka hoʻoheheʻe ʻana a ua piha ka pahu aila i ka mea hoʻoheheʻe wai.