The improvement of the so called clever liquids and viscous
dampers based upon them has enabled a great deal more effective and
adaptable vibration attenuation prospects than ever before. These kind
of semi-active attenuators are already used in a number of industries:
automobiles, washing machines, bridges, constructing structures to name a
few. This is resulting from the small size and particularly to the
swift regulation potential they present: they may be managed in keeping
with the exact demands of your vibrating system.
This article offers the primary theoretical resolution associated with my viscous damper and certain factors with regards to the investigation of shake. There are different choices to manage the actuator, but I have discovered this particular one easy and practical enough. The approach is not my innovation and it applies to just about any viscous damper. I bow to Jeong-Hoi Koo, whose "Groundhook" algorithm or "velocity-based on-off groundhook control" (On-Off VBG) presented in his dissertation I used.
Groundhook Law on Two-Degree-of-Freedom System
The context where the control law is presented is a two-degree-of-freedom mass-spring-damper system.
The concept of a groundhook law is that the mass whose shake is damped, is hooked to the ground by using a damping component. The semi-active component is the controllable, viscous damper that is located between the shaking masses.
The control law is easy: when the upper vibrating weight is going upwards and the lower weight downwards, tension is applied to the viscous damper. This brings about a pulling force to the structure weight to the balance situation of the system.
Groundhook Law Simplified on Single-Degree-of-Freedom System
Nevertheless, due to a presumption or an approximation, this rule can be simplified. If the speed of the lower mass is estimated to be very small and at the same phase with the vibrating weight constantly, the system can be modelled with a single-degree-of-freedom vibration system. If the top vibrating weight is shifting right up and the lower weight remains put, tension is applied to the viscous damper. That causes just as before a drawing force to the structure mass toward the equilibrium position of the system.
Significance of Knowing Your Shake
To be able to get the most out of the attenuation possibilities of a viscous damper, you need to carefully understand your vibrating system. This means that, you should take measurements of the vibrations of the object correctly to find out the troubling frequencies, their magnitudes and the time prompt when the wavelengths occur (for instance three seconds from startup).
Only once measuring these, you could begin planning exactly how a semi-active viscous damper would solve the issue. Or perhaps you will find out that a classic passive damper is a more viable solution. However, when including smart control algorithms on your solution, you have to always assess the vibration system to the bottom.
This article offers the primary theoretical resolution associated with my viscous damper and certain factors with regards to the investigation of shake. There are different choices to manage the actuator, but I have discovered this particular one easy and practical enough. The approach is not my innovation and it applies to just about any viscous damper. I bow to Jeong-Hoi Koo, whose "Groundhook" algorithm or "velocity-based on-off groundhook control" (On-Off VBG) presented in his dissertation I used.
Groundhook Law on Two-Degree-of-Freedom System
The context where the control law is presented is a two-degree-of-freedom mass-spring-damper system.
The concept of a groundhook law is that the mass whose shake is damped, is hooked to the ground by using a damping component. The semi-active component is the controllable, viscous damper that is located between the shaking masses.
The control law is easy: when the upper vibrating weight is going upwards and the lower weight downwards, tension is applied to the viscous damper. This brings about a pulling force to the structure weight to the balance situation of the system.
Groundhook Law Simplified on Single-Degree-of-Freedom System
Nevertheless, due to a presumption or an approximation, this rule can be simplified. If the speed of the lower mass is estimated to be very small and at the same phase with the vibrating weight constantly, the system can be modelled with a single-degree-of-freedom vibration system. If the top vibrating weight is shifting right up and the lower weight remains put, tension is applied to the viscous damper. That causes just as before a drawing force to the structure mass toward the equilibrium position of the system.
Significance of Knowing Your Shake
To be able to get the most out of the attenuation possibilities of a viscous damper, you need to carefully understand your vibrating system. This means that, you should take measurements of the vibrations of the object correctly to find out the troubling frequencies, their magnitudes and the time prompt when the wavelengths occur (for instance three seconds from startup).
Only once measuring these, you could begin planning exactly how a semi-active viscous damper would solve the issue. Or perhaps you will find out that a classic passive damper is a more viable solution. However, when including smart control algorithms on your solution, you have to always assess the vibration system to the bottom.
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