sfd 中文意思是什麼
sfd
解釋
飽和功率通量密度-
To resolve this issue, the shaanxi forestry department ( sfd ) needs to initiate a process for defining the administrative village or natural village forest area, issue a forest certificate to the administrative village or natural village to confirm the legal right of the collective
為了解決這一問題，陜西林業局需要對行政村或自然村森林區進行界定，並且向行政村或自然村頒發森林經營許可證來證實該集體所持有的合法權利。 -
Sfd structure functional design
結構功能設計 -
Nowadays, squeeze film dampers ( sfd ) are used to reduce the vibration in many aero - engines, and then their performance in maneuver flight will affect the whole engine
現今，有不少航空發動機都採用了擠壓油膜阻尼器來減小發動機的振動，而擠壓油膜阻尼器在機動過載的作用下的運動特性將對發動機轉子產生重要影響。 -
The paper studied controlling rotor vibration with the super - elasticity of sma and sfd, set up the new equation of sys tern vibration according to the stress - strain curve of sma in super - elasticity state, used the nonlinear theory and the dynamic stability theory to study the vibration of rotor controlled by sma, discussed the stability condition of the system, obtained the relationship of system parameters when bifurcation was appeared, supposed a method that improves the stability of rotor system and restrains vibration amplitude though changing parameters, and finally validated the effect of restraining vibration of the improved system through emulation
摘要研究利用形狀記憶合金的超彈性和擠壓油膜阻尼器控制轉子振動，利用形狀記憶合金在超彈性狀態下的應力應變曲線，建立了新的系統振動方程，運用非線性理論和運動穩定性理論研究轉子在形狀記憶合金控制下的振動狀態，討論了系統的穩定性條件，獲得系統發生分岔時系統參數之間的關系；並提出了通過改變參數來提高系統穩定性和抑制振幅的方法，最後通過模擬驗證了改進后的系統振動抑制效果。 -
The way to eliminate chaos phenomenon through adjusting system parameters is indicated. the nonlinear dynamic behavior of journal bearing - rotor system in large parameter space is studied in numerical integral method and floquet theory and the first and second bifurcation behavior of nonlinear rotor system are discussed ; the concept is advanced that realizing the controllable nonlinear stiffness with sfd with the soft - nonlinear of sma in the super - elasticity state to make the vibration amplitude of system always be in the small solution state to reduce the vibration amplitude of rotor system
運用數值積分方法結合floquet理論對滑動軸承-轉子系統的大參數范圍非線性動力學特性進行了全面的研究，詳細地討論了系統的一次和二次分岔行為； 5 ）提出了用形狀記憶合金在超彈性狀態下的軟非線性，結合擠壓油膜阻尼器實現系統剛性的非線性可控，降低系統在非定常狀態下的最大振幅的構想。 -
Sfd should also explore the possibility to encourage collective forests to be contracted to households
陜西林業局還應探索鼓勵普通住戶承包集體森林的可能性。 -
This dissertation aims to reveal the influence of maneuver load ( including additional centrifugal force and gyroscopic moment ) on the vibration performance of rotors with sfd
本文旨在揭示機動飛機產生的附加離心力和附加陀螺力矩對擠壓油膜阻尼器以及發動機轉子系統振動特性的影響。 -
Sfd corporation ltd
陽光88物業有限公司 -
Non - synchronous response and bifurcation character of two - disk rotor system with a non - centralized sfd
系統的非協調響應和分叉特性 -
The project will subcontract work with shaanxi forestry department ( sfd ), shaanxi environmental protection bureau ( sepb ) and shaanxi tourism bureau to develop an eco - tourism guideline
該項目將和陜西林業局、陜西環境保護局和陜西旅遊局簽訂分包合同，制定生態旅遊方針。
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