Seal concept gmbh dichtungen halbzeuge is one of the reliable industrial companies in the range rod seals as well as gaskets , hydraulic packings and also rotary shaft seals 该企业为您提供阻尼器、减震器、消声器、减摆器、扭转振动减振器、汽船、调节风门、阻尼装置、密封环和缓冲装置以及棒料密闭和自紧油封的报价。
The rotor model used in the present study is a rigid - blade flap - lag model . analytical tools are developed for combined rotor - damper steady state response , stability and transient ( time domain ) response and damper loads 由于粘弹减摆器减摆器幅变、频变特性，迫切需要一种基于瞬态响应分析的，能快速有效的阻尼识别技术。
Through an application of the improved nonlinear vks model based on complex modulus , for the cases of general connections and inter - blade connections for the nonlinear elastomeric lag dampers , the small disturbance momental equation is given 采用基于复模量的非线性vks改进模型，建立叶间粘弹减摆器和普通连接粘弹减摆器的小扰动力矩方程。
To improve the stability , one common method is to install dampers at the roots of blades . however , commonly used dampers can hardly meet different demands when helicopter working in different conditions 为提高旋翼/机体耦合动稳定性,一般采用在桨叶根部安装减摆器的方法,但目前常用的减摆器很难满足直升机不同工作状态下对摆振器阻尼的不同需求。
On the basis of reference ( superscript [ 6 ] ) , the influence of damping of shimmy damper , moment of inertia of wheel , tire cornering stiffness and strut tilt stiffness on parametric shimmy stability of aircraft wheel is investigated in the paper 摘要本文在文献[ 6 ]的基础上，首次研究了减摆器阻尼、机轮转动惯量、轮胎偏滚刚度、支柱侧倾刚度对飞机机轮参数摆振稳定性的影响。
Among others , one method to solve this problem is to install lead - lag dampers . the conventional configuration for installing dampers is to put them between blades and hub . in 1990s , eurocopter began to use the inter - blade dampers in ec155 which means to put every damper between two adjacent blades 传统的减摆器布置是桨叶-桨毂式;上个世纪90年代,欧直公司开始在ec155上使用叶间减摆器,减摆器不是布置在桨叶和桨毂之间,而是布置在相邻两片桨叶之间。
The flight test of ec155 tells us that inter - blade dampers can work very well in stabilizing the system ; another advantage of this configuration is it can make the hub system simpler and reduce the drag of air to the hub which is very important for helicopters with 4 or more than 4 blades Ec155的飞行试验证明,这种减摆器布置方式对提高稳定性效果明显;这种布置方式的另外一个优点是可以简化桨毂,降低其气动阻力,对多桨叶(四片和四片以上)直升机有重要意义。
Damping was then determined via exciting the equation at the critical frequency to get the transit decay which was then analyzed with the moving - block method . in chapter 4 , the nonlinear dynamic equation of rotor - body system with inter - blade dampers ( taking all possible attachment offsets into consideration , spanwise offset , vertical offset and in - plane offset ) was modeled 本文重点推导了带叶间减摆器(减摆器带三个外伸量:展向,垂向和旋转方向)的旋翼/机体耦合系统的非线性动力学方程,针对该方程提出了一种改进的多桨叶坐标变换方法。
The new model captures important behavior such as reduced damping in forward flight due to dual - frequency motion . it also captures the correct force - displacement ( time domain ) hysteresis behavior . the new inter - blade damper nonlinear kinematics model confirms experimentally observed results reported in the literature : certain damper attachment offsets can lead to reduced damper 1 / rev motion and forces 数值结果表明：本文的粘弹减摆器模型与以往的模型相比有很大的改进，可以准确地计算减摆器在时域内的力位移迟滞曲线，也可以很好的描述直升机前飞过程中减摆器出现的双频特性。
Second , taking the characteristics of the mrfd and its matching with blades into consideration , the squeeze mode mrfd was designed . after that , the mechanical characteristics of the squeeze mode mrfd was tested to tell us that , compared with those mrfd work in other modes , the squeeze mode is advantageous for its compact structure , less displacement and higher strength . third , with the test data , we get the force model which use imitatation 其次,考虑磁流变阻尼器自身特点与直升机旋翼的匹配因素,设计了以挤压模式为工作方式的磁流变减摆器,并对磁流变减摆器进行了力学特性试验,试验结果表明挤压式磁流变阻尼器与其他工作模式的磁流变阻尼器相比具有结构紧凑、位移小、出力大等优点。
