| 1. | Sfd structure functional design
结构功能设计 |
| 2. | Sfd corporation ltd
阳光88物业有限公司 |
| 3. | Non - synchronous response and bifurcation character of two - disk rotor system with a non - centralized sfd
系统的非协调响应和分叉特性 |
| 4. | Sfd should also explore the possibility to encourage collective forests to be contracted to households
陕西林业局还应探索鼓励普通住户承包集体森林的可能性。 |
| 5. | 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
该项目将和陕西林业局、陕西环境保护局和陕西旅游局签订分包合同，制定生态旅游方针。 |
| 6. | 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
本文旨在揭示机动飞机产生的附加离心力和附加陀螺力矩对挤压油膜阻尼器以及发动机转子系统振动特性的影响。 |
| 7. | 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
现今，有不少航空发动机都采用了挤压油膜阻尼器来减小发动机的振动，而挤压油膜阻尼器在机动过载的作用下的运动特性将对发动机转子产生重要影响。 |
| 8. | 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
为了解决这一问题，陕西林业局需要对行政村或自然村森林区进行界定，并且向行政村或自然村颁发森林经营许可证来证实该集体所持有的合法权利。 |
| 9. | 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
摘要研究利用形状记忆合金的超弹性和挤压油膜阻尼器控制转子振动，利用形状记忆合金在超弹性状态下的应力应变曲线，建立了新的系统振动方程，运用非线性理论和运动稳定性理论研究转子在形状记忆合金控制下的振动状态，讨论了系统的稳定性条件，获得系统发生分岔时系统参数之间的关系；并提出了通过改变参数来提高系统稳定性和抑制振幅的方法，最后通过仿真验证了改进后的系统振动抑制效果。 |
| 10. | 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
运用数值积分方法结合floquet理论对滑动轴承-转子系统的大参数范围非线性动力学特性进行了全面的研究，详细地讨论了系统的一次和二次分岔行为； 5 ）提出了用形状记忆合金在超弹性状态下的软非线性，结合挤压油膜阻尼器实现系统刚性的非线性可控，降低系统在非定常状态下的最大振幅的构想。 |
