Literature Review NEW-1.docx - 1.0 Literature Review...

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1.0 Literature Review Vibration phenomenon is one of the most difficult area that engineer deals with. If the vibration happened to be in the wrong places, frequencies, or quantities these may cause destruction for mainly structure and machine. Over the years to cater these problems engineer has developed vibration controls system. There are two types of vibration control which are active and passive vibration control. Both have its own benefit over other, however passive vibration control will be the method for the design of the absorber due to its advantages mention below. These active and passive vibration controls can be further dividing into two types of vibration control system which are vibration isolation and vibration absorber. 1.2 Vibration Control System In vibration control systems there to main concept being applied which are vibration isolation and vibration absorption or sometimes called vibration damping. The concept of both vibration isolation and absorption are often misunderstood, however, both are different from each other. It is necessary to understand both concepts thoroughly before proceeding further into the research. Vibration absorber refers to the absorption of vibrational energy which has entered the system and dissipating it by converting the kinetic energy of vibration into different form of energy. On the other hand vibration isolator refers to prevention of vibration energy from entering a system. Absorption is primarily prevent the system from vibrating in a larger amplitude at it natural frequency (resonance), however, isolation refer to the region which having lower value of transmissibility [Rob07]. Both absorption and isolation region was shown in Figure 2.1: Transmissibility curve with absorption and isolation region.
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Figure 2.1: Transmissibility curve with absorption and isolation region 1.2.1 Vibration Isolation Vibration isolation is one of the most basic types of control system where the main structure is separated from the vibration source so that vibration from the source doesn’t transfer vibration to main structure. The most common vibration isolation methods include installing rubber mounting pad between the machine and floor [Har96] , or adding passive spring/dampers to the mechanical structure [Soo97] as shown in Figure 2.2: Free-body- diagram of Vibration Isolator. The isolator became the vibration transmission path between vibration source and the main structure thus suppressing the vibration.
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Figure 2.2: Free-body-diagram of Vibration Isolator Passive Vibration Isolation Isolation However in most conventional passive isolator used, where mechanical coupling with linear stiffness are used to support the load of the machine, a limitation which is unavoidable when determining the required stiffness of the vibration isolator. The two most important aspects in the design of vibration isolator are load capacity and effective vibration isolation [Zhu13]. Large stiffness is required by the isolator to create enough force to support the load weight to avoid excessive structural deflection. However to improve vibration isolation, low
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  • Winter '14
  • STUDENT
  • Journal of Sound and Vibration, absorber. Journal of Sound and Vibration

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