| 翻訳と辞書 |
| passive heave compensation ： ウィキペディア英語版 |
passive heave compensation
Passive heave compensation is a technique used to reduce the influence of waves upon lifting and drilling operations.〔Passive and Active heave Compensation, Albers, TU Delft〕 A simple passive heave compensator (PHC) is a soft spring which utilizes spring isolation to reduce transmissibility to less than 1.〔Bob Wilde and Jake Ormond: ''Subsea Heave Compensators'', Deep Offshore Technology 2009〕 PHC differs from AHC by not consuming external power.
==Principle==
The main principle in PHC is to store the energy from the external forces (waves) influencing the system and dissipate them or reapply them later. Shock absorbers or drill string compensators are simple forms of PHC, so simple that they are normally named heave compensators, while "passive" is used about more sophisticated hydraulic or mechanical systems.
A typical PHC device consists of a hydraulic cylinder and a gas accumulator. When the piston rod extends it will reduce the total gas volume and hence compress the gas that in turn increases the pressure acting upon the piston. The compression ratio is low to ensure low stiffness. A well designed PHC device can achieve efficiencies above 80 percent.〔(The Engineers Guide ) Safelink AS〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「passive heave compensation」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|