Anti-vibration Design Of Industrial Buildings

In the process of arrangement, there will have a large vibration equipment lay onthe floor of coal preparation plant. In the production run, the equipment producevibration inevitably.Resonance phenomenon is easy to appear in the design of industrialworkshop. Even a small force can also cause a larger amplitude of the structure, whichmake the person produces discomfort or impact on the degree of precision instruments.Blindly increasing the section of the beam does not necessarily reduce the amplitude, itmay increase the amplitude. This is because of the resonance effect.This article applied finite element software SAP2000and using history analysismethod calculate dynamic characteristics and dynamic response of the coal preparationplant. From the view of structure dynamic characteristics, we present how to change thenatural frequency of the structure in the design process, in order to avoid resonance andmeet the requirements of allowed limit.The conclusions are as following:(1)The highest natural frequency is vertical frequency in the workshop, thehorizontal vibration frequency is lower than the vertical vibration frequency;(2) There will appear frequency concentration areas because of the intenselyvertical frequency in the coal preparation plant. But the horizontal frequency are sparse;(3) The frequency value corresponding to the maximum coefficient of verticalmass participation may cause the most dangerous resonance.(4) The law between amplitude and scrambled or vibration velocity and scrambledhave roughly the same direction and trend.(5) Using different calculation models for the anti vibration design has differentresults.Depending on the circumstances of engineering or the actual surrounding ofsource,closing the slab column model that closed to the engineering structures for antivibration design is more reasonable.(6)In the anti-vibration design of industrial buildings,we should try to make thescrambling less than the vertical fundamental frequency of the structure, the verticalfrequency of structure and the frequency value corresponding to the maximumcoefficient of vertical mass participation could stay away from the scrambling to meetthe requirements of limitation.We also suggests that the equipment can be putted onmain girder. (7)To a vibrating screen of16Hz,we can make the vertical base frequency of thestructure control over16/0.75=21.3Hz, and make the frequency value corresponding tothe maximum coefficient of vertical mass participation away from that value,it will notoccur resonance generally.(8)The resonance frequencies of the beam which has a larger stiffness under themachine,close to the frequency valuecorresponding to the maximum coefficient ofvertical mass participation. The resonance frequencies of the beam which has a smallrstiffness under the machine,close to the vertical base frequency and it cause the mostdangerous resonance.In the anti-vibration design of industrial buildings,we could try tomake the beam under the machinehave a large stiffness without increasing the rest ofthe beams.