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・ Dasht-e Naseri
・ Dashlujeh
・ Dashlujeh, Ardabil
・ Dashlujeh, East Azerbaijan
・ Dashlujeh, Zanjan
・ Dashman Forest Reserve
・ Dashmesh Regiment
・ Dashmina Upazila
・ Dashni Murad
・ Dashnor Bajaziti
・ Dashnor Kokonozi
・ Dashnor Sula
・ Dashon Goldson
・ DaShon Polk
・ Dashora
Dashpot
・ Dashpot timer
・ Dashqotan
・ Dashrath Chand
・ Dashrath Manjhi
・ Dashrath Patel
・ Dashrath puri
・ Dasht
・ Dasht (Kharan)
・ Dasht Ahu
・ Dasht Ahu, Qazvin
・ Dasht Andar
・ Dasht Avzar
・ Dasht Azadgan
・ Dasht Bal, Fars


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Dashpot : ウィキペディア英語版
Dashpot

A dashpot is a mechanical device, a damper which resists motion via viscous friction. The resulting force is proportional to the velocity, but acts in the opposite direction, slowing the motion and absorbing energy. It is commonly used in conjunction with a spring (which acts to resist displacement). The process and instrumentation diagram (P&ID) symbol for a dashpot is 35px.
== Types ==
Two common types of dashpots exist - linear and rotary. Linear dashpots are generally specified by stroke (amount of linear displacement) and damping coefficient (force per velocity). Rotary dashpots will have damping coefficients in torque per angular velocity.
A less common type of dashpot is an eddy current damper, which uses a large magnet inside a tube constructed of a non-magnetic but conducting material (such as aluminium or copper). Like a common viscous damper, the eddy current damper produces a resistive force proportional to velocity.
Dashpots frequently use a one-way mechanical bypass to permit fast unrestricted motion in one direction and slow motion using the dashpot in the opposite direction. This permits, for example, a door to be opened quickly without added resistance, but then to close slowly using the dashpot. For hydraulic dashpots this unrestricted motion is accomplished using a one-way check-valve that allows fluid to bypass the dashpot fluid constriction. Non-hydraulic dashpots may use a ratcheting gear to permit free motion in one direction.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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