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transfer functions
相关语句
  传递函数
    By resorting to both the transfer functions and dynamic magnification factors(DMF) formulated for the MTMD-1-MTMD-5 structural system,the MTMD-1-MTMD-5 criterion for optimum searching is then defined.
    基于建立的MTMD-1-MTMD-5结构系统传递函数和动力放大系数(DMF),定义了求解MTMD-1-MTMD-5最优参数的优化准则。
短句来源
    PREDICTING BLASTING VIBRATION EFFECT OF BUILDINGS USING TRANSFER FUNCTIONS
    用传递函数预测建筑结构的爆破震动效应
短句来源
    An Analysis on the Characteristics of Piles Socketed in Mudstone Using Load Transfer Functions Measured in Field
    用现场实测荷载传递函数分析泥岩桩的性状
短句来源
    A nonlinear analysis method for the axial stiffness of single pile is proposed by using the nonlinear load transfer functions to simulate the interaction between pile and soil.
    通过采用非线性荷载传递函数模拟桩土之间的非线性共同作用 ,提出了单桩轴向刚度的非线性分析方法 ;
短句来源
    Based on the derived transfer functions of the structure with MTMD and every TMD in the MTMD,the design formulas are then derived for the dynamic magnification factors of the structure and every TMD[DMF and DMF j(j=1,2,3,...,n)].
    基于导出的设置MTMD时结构和每个TMD的传递函数 ,建立了结构和每个TMD的动力放大系数 [DMF和DMFj(j=1 ,2 ,3,… ,n) ]设计公式。
短句来源
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  “transfer functions”译为未确定词的双语例句
    The Experimental Study of the Room Transfer Functions Formed by Heat Source Inside the Room With Upward Displacement
    下送风室内热源条件下房间传递函数的实验研究
短句来源
    For the prediction of displacements under axial or lateral loadings, methods of determination of load transfer functions (t-z or p-y curves) from PM and PAF expansion tests are given and evaluated.
    对用旁压试验预估轴向或横向荷载作用下的位移,提出了土阻力发挥曲线的取定方法,并对其作了评价。
短句来源
    In the light of the isolating system consisting of the absorbers between the drum and frame, a mathematical model was built up, which consists of a drum, a frame and an accompany vibratory soil. The transfer functions of the drum soil system were analysed. The influence on the system dynamic properties by means of changing the rubber absorber properties was analysed.
    针对振动压路机振动轮与机架间的多个橡胶减振器组成的减振支承系统 ,在振动轮土壤系统模型基础上 ,分析了振动轮与机架间的减振支承系统刚度参数对压实能力和机架位移的影响 ,分别以最大压实功率积和最小机架位移为目标函数 ,优选了减振支承系统刚度参数 ,得出了应以高振幅作业下的最优减振支承系统刚度参数作为设计依据的结论
短句来源
  相似匹配句对
    STUDIES ON THE MODAL SYNTHESIS METHOD USING TRANSFER FUNCTIONS
    直接利用传递函数进行模态综合的研究
短句来源
    On Functions of Roofs
    论屋顶功能
短句来源
    PREDICTING BLASTING VIBRATION EFFECT OF BUILDINGS USING TRANSFER FUNCTIONS
    用传递函数预测建筑结构的爆破震动效应
短句来源
    Museum Functions and Visitors
    博物馆功能与观众
短句来源
    DISCUSSION OF TRANSFER OF PRESTRESSES IN FRAME
    框架结构中预应力的传递问题
短句来源
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  transfer functions
In the research on spatial hearing and virtual auditory space, it is important to effectively model the head-related transfer functions (HRTFs).
      
In the research on spatial hearing and realization of virtual auditory space, it is important to effectively model the head-related transfer functions (HRTFs) or head-related impulse responses (HRIRs).
      
It was shown that the processes in the observer based on the desired matrix transfer functions are limited by the possibilities of physical realization and that in the general case the desired processes in the observer are rank-constrained.
      
An algorithm to design the united "state observer-controller" system from the desirable closed-loop matrix transfer functions was proposed.
      
The problem of linear control by the desired matrix transfer functions of the closed loop under incomplete information about the object state vector was considered.
      
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This paper is a continuation of the paper in 1981[2] ir which the authors presented the method of inverse input identificat ion in frequency domain, and the errors are usually about 10% mainly from the equivalent linearization. For reducing these errors a mixed method in both time and frequency domain has been suggested here. That is, the normal computation is carried out in time domain and the inverse one in frequency domain; in addition, the transfer function is assumed to be unchanged within one circle...

This paper is a continuation of the paper in 1981[2] ir which the authors presented the method of inverse input identificat ion in frequency domain, and the errors are usually about 10% mainly from the equivalent linearization. For reducing these errors a mixed method in both time and frequency domain has been suggested here. That is, the normal computation is carried out in time domain and the inverse one in frequency domain; in addition, the transfer function is assumed to be unchanged within one circle of iteration. It can be seen from the results of the numerical computation that the errors may be reduced greatly in comparison with the equivalent linearization met iod in frequency domain.

本文是文献〔2〕的继续。该文献中作者们提出在频域反演求输入的方法,误差一般在10%左右,主要来自所采用的等效线性化方法。为了减小这一误差,本文采用一种时域频域的混合法,在时域中进行正演计算,在频域中进行反演计算,假设传递函数在一轮迭代之内是不变的。从计算结果来看,误差大为减小。

Analyses of the vertical seismic motion input to high-rise structures such as chimneys lead to the following conclusions.The effect of the elasticity and dimension of a foundation on the input motion can be neglected within the frequency band, 0-20 Hz., interesting in earthquake engineering. The vertical interaction of high -rise structures with the surrounding soil of moderate rigidity may result in considerable differences of Fourier spectra of ground motion at structure basement from those of the free field...

Analyses of the vertical seismic motion input to high-rise structures such as chimneys lead to the following conclusions.The effect of the elasticity and dimension of a foundation on the input motion can be neglected within the frequency band, 0-20 Hz., interesting in earthquake engineering. The vertical interaction of high -rise structures with the surrounding soil of moderate rigidity may result in considerable differences of Fourier spectra of ground motion at structure basement from those of the free field motion, the transfer function Tv which reflects these differences provides a possible approach to study the following problems:1. to correct the effects of structures on vertical ground motion, 2. to transfer the ground motion records of free field into the input motion at a structure basement, 3. to analyse the dynamic properties of a whole structure-soil system by comparing the theoretical transfer function with the experimental one. The damping of a soil-structure system during earthquake is mainly controlled by the radiation of waves scattered from the foundation into the surrounding soil and the contribution of internal friction of structures to the damping is negligible for the soil of moderate rigidity. Therefore, the assumption that the soil can be simplified as a static spring is reasonable only for the soil of high rigidity. Finally,some comments upon the discussion on the vertical seismic responses of structures are made.

本文以烟囱为例研究了结构的竖向地震输入问题。研究结果表明,基础弹性和截面的变化对行波输入系数γ_v的影响很小。给定基础底部的地震输入,在地震工程感兴趣的频段内(0—20赫兹),|γ_v|=1,即基础不会引起竖向地震输入的放大。文献〔7〕采用的基础对地震输入具有很强的放大效应的假定是不合理的。 对于一般中等坚硬土壤,高耸结构-土竖向共同作用的结果很可能导致结构基底和附近自由地表地震动频谱的显著差异。文中导出的反映这一差异的传递函数T_v为下列课题的研究提供了线索:1.校正高耸结构物对竖向地面运动的影响,把结构基底的强震记录转化为自由场地面运动记录,以用于近场地震学的研究;2.将自由地面竖向运动记录转化为结构基底地面运动,以用作按反应谱理论计算结构反应的地震输入;3.通过对比理论和观测的传递函数T_v来推断结构-土系统竖向运动的整体动力特性。 就烟囱等高耸结构的竖向地震反应而言,对于一般中等坚硬土壤,整个结构-上体系的阻尼力主要来源于地基内的辐射阻尼。结构阻尼和辐射阻尼相比可以略去不计。所以将地基简化为静力弹簧的处理方法〔5〕只能运用于坚硬地基,其它情况下可能导致较大的误差。 本文还就当前我国地震工程界围绕竖向地...

本文以烟囱为例研究了结构的竖向地震输入问题。研究结果表明,基础弹性和截面的变化对行波输入系数γ_v的影响很小。给定基础底部的地震输入,在地震工程感兴趣的频段内(0—20赫兹),|γ_v|=1,即基础不会引起竖向地震输入的放大。文献〔7〕采用的基础对地震输入具有很强的放大效应的假定是不合理的。 对于一般中等坚硬土壤,高耸结构-土竖向共同作用的结果很可能导致结构基底和附近自由地表地震动频谱的显著差异。文中导出的反映这一差异的传递函数T_v为下列课题的研究提供了线索:1.校正高耸结构物对竖向地面运动的影响,把结构基底的强震记录转化为自由场地面运动记录,以用于近场地震学的研究;2.将自由地面竖向运动记录转化为结构基底地面运动,以用作按反应谱理论计算结构反应的地震输入;3.通过对比理论和观测的传递函数T_v来推断结构-土系统竖向运动的整体动力特性。 就烟囱等高耸结构的竖向地震反应而言,对于一般中等坚硬土壤,整个结构-上体系的阻尼力主要来源于地基内的辐射阻尼。结构阻尼和辐射阻尼相比可以略去不计。所以将地基简化为静力弹簧的处理方法〔5〕只能运用于坚硬地基,其它情况下可能导致较大的误差。 本文还就当前我国地震工程界围绕竖向地震力的争论提出了一些看法。

It is very important for nonlinear curve fitting technique of the system transfer function to speed up the convergence of the objective function. The gradient method is available only for the objective function with equal eigenvalues of Hessian matrix. In this paper an optimization algorithm called false gradient method is presented, which is powerful for the objective function with unequal eigenvalues of Hessian matrix.The conception of the false gradient methcd is to use a linear transformation...

It is very important for nonlinear curve fitting technique of the system transfer function to speed up the convergence of the objective function. The gradient method is available only for the objective function with equal eigenvalues of Hessian matrix. In this paper an optimization algorithm called false gradient method is presented, which is powerful for the objective function with unequal eigenvalues of Hessian matrix.The conception of the false gradient methcd is to use a linear transformation to make the Hessian matrix having equal eigenvalues in the new coordinate system, supposing the linear transformation isWhereis a n×n linear transformation matrix, {X}e R" is the original coordinate system, {Z}e R" is the new coordinate system. The gradient Ex in the original space is thenwhere E is the objective function.The gradient Eg in the new space has a form similar to the original. According to the expression( I )The direction -Ez to be used as a searching direction in the new space has better convergence than the direction -E, in the original space.The effects of direction -Ez en the convergence of searching process in the new space can also be achieved by the false gradient -Ez in the original space. Because of the linear transformation ( I ) , the points on the line with direction -Ez in the new space should correspond to the points on the line with certain direction F in the original space. After some derivation the direction F is to be formulated aswhich is the direction of the false gradient Exf.

系统辨识是系统理论中的一个重要组成部分,为了准确地建立系统的数学模型,它是一个不可缺少的环节。 系统辨识是通过对系统输入、输出信号的数据处理,采用各种非线性规划方法确定系统特征值和特征向量,继之确定系统的各种真实分布参数。对比前后两次系统辨识的结果,可以用来“诊断”一个结构物(系统)的损坏及损坏部位。 系统辨识中的一个关键问题是非线性曲线拟合。由于结构物都是高阶系统,且各特征值分布比较密(或有疏有密),这时各种非线性规划法收敛速度很慢。本文提出所谓“假梯度”法,大大加速了目标函数在汉森矩阵(Hessian Matrix)特征值不相同情况下的收敛速度,计算准确,适用于任何高阶系统的参数辨识,为结构物的损坏及损坏部位的“诊断”提供了切实可行的途径。 本文是作者在美国马里兰大学机械系“系统辨识及其应用”研究小组的工作的一部分。

 
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