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Tuned Mass Damper<\/h1>\n<\/div>\n<\/div>\n<\/div>\n

A Tuned Mass Damper (TMD) is a mechanical device, that you can buy at Flow Engineering, designed to add damping to a structure for a certain range of vibration frequencies. When properly designed, the extra damping will remove excessive movements<\/span> of the structure. Feel free to contact us<\/a> for more information or for your inquiry of a tuned mass damper system.<\/p>\n

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Working Principle of the Tuned Mass Damper<\/h2>\n

A Tuned Mass Damper (that you can order at our company) contains a suspended mass that is able to move in the same direction as the structure vibration direction. The oscillation frequency of the mass is tuned using either a spring system or pendulum system. When the structure starts to oscillate, the mass of the TMD mass will resonate with the vibration. A damper component connected between the structure and the TMD mass turns the kinetic energy of the structure into thermal energy, which dampens and lowers the amplitude of the structure. The design of an TMD depends on the oscillation frequency, mass of the structure, the direction of the movements (one horizontal direction, two horizontal directions, or vertical), and the available space.<\/p>\n

Here you see a test configuration of one of our TMDs using a hydraulic actuator.<\/p>\n

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桥上TMD的测量

华体会体育app下载流量工程公司对TMD系统的有效性进行了简单的演示Jan Linzelviaduct.这个演示是在调谐质量阻尼器安装之前和之后录制的。华体会体育登录阻尼器对振动灵敏度有很大的影响。

Guarantee<\/h2>\n

Flow Engineering has more than 20 years of experience in the calculation, designing, manufacturing<\/a>, and installation of Tuned Mass Damper (TMD) systems. Our TMD systems are applied to bridges<\/a>, flagpoles, chimneys, distillation columns and other slender structures.<\/p>\n

Our TMD systems have proven themselves in practice. We guarantee that the solutions we offer ensures the reduction of unwanted vibrations to an acceptable level, thereby preventing fatigue damage.<\/p>\n

Advanced TMD Designs<\/h2>\n

By cleverly designing a Tuned Mass Damper (TMD) \u2013 that you can buy at Flow Engineering \u2013 a single device can add sufficient damping for o or more of the structure\u2019s natural frequencies, limiting the number of necessary TMDs. Using our own developed unique TMD design software<\/span>, we can guarantee correct operation within a specified design range even when using multiple TMDs for a single structure.<\/p>","tablet":"

Guarantee<\/h2>\n

Flow Engineering has more than 20 years of experience in the calculation, designing, fabrication, and installation of Tuned Mass Damper (TMD) systems. Our TMD systems are applied to bridges<\/a>, flagpoles, chimneys, distillation columns and other slender structures.<\/p>\n

Our TMD systems have proven themselves in practice. We guarantee that the solutions we offer ensures the reduction of unwanted vibrations to an acceptable level, thereby preventing fatigue damage.<\/p>\n

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Tuning<\/h2>\n<\/p>

By cleverly designing a Tuned Mass Damper (TMD), a single device can add sufficient damping for two or more of the structures natural frequencies, reducing the number of necessary TMDs. In order to perform such optimizations, we model the structure with a finite element package to calculate the modes of vibration of the structure. The TMD is then tuned to add at least the necessary damping for each natural frequency.<\/p>"}},"slug":"et_pb_text"}" data-et-multi-view-load-tablet-hidden="true">

保证

华体会体育app下载Flow Engineering在计算,设计,制造业,以及安装调谐质量阻尼器(TMD)系统。华体会体育登录我们的TMD系统应用于桥梁旗杆、烟囱、蒸馏塔等细长结构。

我们的TMD系统已经在实践中证明了自己。我们保证,我们提供的解决方案确保将不必要的振动降低到可接受的水平,从而防止疲劳损伤。

先进的TMD设计

通过巧妙地设计一个调谐质量阻尼器(TMD)——你华体会体育登录可以在Flow Engineering买到——单个设备可以为结构的o或更多的固华体会体育app下载有频率增加足够的阻尼,限制必要的TMD的数量。使用自主研发的独特TMD设计软件,即使对单个结构使用多个tmd,我们也可以保证在指定的设计范围内正确运行。

Design considerations<\/h2>\n

In simple situations a structure with a Tuned Mass Damper can be modeled as in the following figure.<\/p>\n

<\/a><\/p>\n

Here\u00a0k<\/em> refers to the spring constant, c<\/em> the damper constant, and m<\/em>\u00a0is the mass. Subscript\u00a01<\/em>\u00a0pertains to the structure and subscript\u00a02<\/em>\u00a0to the TMD.<\/p>\n

A TMD can significantly reduce the response of a structure, as can be seen from the following graph.<\/p>\n

<\/a><\/p>\n

The effects of varying several design parameters are given below.<\/p>\n

Mass of Structure<\/h2>\n

Increasing the mass ratio \u03bc (increasing the damper mass vs the mass of the vibrating structure) will decrease the structural displacement. The normalized structural displacement amplitude can be computed with the formula given by J.P. Den Hartog in \u201cMechanical Vibrations\u201d:<\/p>\n

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As can be seen from the figure, Den Hartog\u2019s approach, calculating with\u00a0\u03b61=0\u03b61=0, is slightly conservative for steel structures (\u03b61=0.2%\u03b61=0.2%) at the lower mass ratios.<\/p>","tablet":"

Design considerations<\/h2>\n

In simple situations a structure with a connected Tuned Mass Damper (TMD) can be modelled as in the following figure.<\/p>\n

<\/a><\/p>\n

Here k<\/em> is the spring constant, c<\/em> is the damper constant, and m<\/em> is the mass. Subscript 1<\/em> pertains to the structure and subscript 2<\/em> to the TMD.<\/p>\n

A TMD can significantly reduce the response of a structure, as can be seen from the following graph.<\/p>\n

<\/a><\/p>\n

The effects of varying several design parameters are given below.<\/p>\n

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Mass Ratio \u03bc<\/h2>\n<\/p>

Increasing the mass ratio \u03bc (increasing the damper mass) will decrease the structural displacement. The normalized structural displacement amplitude can be computed with the formula given by J.P. Den Hartog in \u201cMechanical Vibrations\u201d:<\/p>\n

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As can be seen from the figure, Den Hartog\u2019s approach, calculating with \u03b61=0\u03b61=0, is slightly conservative for steel structures (\u03b61=0.2%\u03b61=0.2%) at the lower mass ratios.<\/p>"}},"slug":"et_pb_text"}" data-et-multi-view-load-tablet-hidden="true">

设计注意事项

在简单情况下,具有调谐质量阻尼器的结构可以如下图所示建模。华体会体育登录

在这里k为弹簧常数,c阻尼常数,和是质量。下标1属于结构和下标2到TMD。

TMD可以显著降低结构的响应,如下图所示。

不同设计参数的影响如下所示。

结构质量

增加质量比μ(增加阻尼器质量对振动结构质量)将减小结构位移。归一化结构位移幅值可以用J.P. Den Hartog在《机械振动》中给出的公式计算:

从图中可以看出,dan Hartog的方法(ζ1= 01 =0)在较低的质量比下,对于钢结构(ζ1=0.2% - ζ1=0.2%)略微保守。

寻找塔/TMD工程公司?联系我们

Damper Frequency<\/h2>\n

The eigenfrequencies of a structure may not be known to a sufficient level of accuracy at the time that the TMDs are designed. It is then useful to define a range in which the frequency of the eigenmode to be damped is sure to reside. By designing an appropriate Tuned Mass Damper for the entire range, the TMD can be designed and produced without the need for measuring the structure eigenfrequencies.<\/p>\n

In the case that the structure has multiple eigenfrequencies relatively near to each other, a TMD with a wide effective frequency range may be used to add damping to several eigenmodes. Reducing the cost of the vibration damping system.<\/p>\n

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TMD Damping Ratio<\/h2>\n

The increase in amplitude from mis-tuned internal damping can be significant. It is because of this effect that we advise changing the internal dampers at set intervals of 15 to 25 years, depending on the damper used.<\/p>\n

Our ongoing research into maintenance free Tuned Mass Dampers has solved this issue for linear tuned mass dampers. Buy\u00a0our solution for linear Tuned Mass Dampers:\u00a0Magnovisco Linear Dampers<\/a>.<\/p>\n

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Damper Frequency f<\/h2>\n

The eigenfrequencies of a structure may not be known to a sufficient level of accuracy at the time that the TMDs are designed. It is then useful to define a range in which the frequency of the eigenmode to be damped is sure to reside. By designing an appropriate Tuned Mass Damper for the entire range, the need for measuring a structures eigenfrequencies before a TMD can be produced is negated.
In the case that the structure has multiple eigenfrequencies relatively near to each other, a wide range TMD may be used to add damping to several eigenmodes. Reducing the cost of the vibration damping system.<\/p>\n

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Internal Damping Ratio \u03b62\u03b62<\/h2>\n

The increase in amplitude from mis-tuned internal damping can be significant. It is because of this effect that we advise changing the internal dampers at set intervals of 15 to 25 years, depending on the damper used.
Our ongoing research into maintenance free Tuned Mass Dampers has solved this issue for linear tuned mass dampers. See our solution for linear Tuned Mass Dampers: Magnovisco Linear Dampers.<\/p>\n

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阻尼器频率

在设计tmd时,结构的特征频率可能没有足够的精度。然后,定义一个需要阻尼的特征模态的频率肯定存在的范围是有用的。通过在整个范围内设计适当的调谐质量阻尼器,可以在不需要测华体会体育登录量结构特征频率的情况下设计和生产TMD。

当结构具有多个特征模态时,可以采用有效频率范围较宽的TMD为多个特征模态增加阻尼。降低减振系统的成本。

TMD阻尼比

由于内部阻尼调错,振幅的增加可能是显著的。正是由于这种影响,我们建议每隔15到25年更换一次内部阻尼器,这取决于所使用的阻尼器。

我们正在进行的免维护调谐质量阻尼器的研究已经解决了线性调谐质量阻尼器的这个问题。华体会体育登录购买我们的线性调谐质量阻尼器解决方案:华体会体育登录Magnovisco线性阻尼器