Research On Floating Raft System And Its Dynamic Characteristics For Vibration Isolation Of Oil Engine On The Floor

In recent years,with the rapid development of emerging technologies such as cloud computing,big data,and the Internet of Things,the demand for large-scale data centers has increased dramatically.Therefore,in order to meet the zero-failure rate requirements of data centers,the demand for oil engines has been greatly increased.The room settings must have higher flexibility in large cities.In order to save land resources,it is a good choice to place oil engines on the floor.Oil engines on the floor will inevitably have a great influence on the structural design.Firstly,due to the dynamic effect of the oil engines vibration,the floor design must avoid the vibration frequency to suppress the resonance.The interaction mechanism between the unit and the floor is one of the problems that must be solved.Secondly,it also needs to consider how to solve the load and structural design.oil engines are very heavy and the dry weight of the P2200E can reach 15 tons.In this work,the measure of floating raft isolation is put forward to solve the problem of oil engines on the floor,and establish mechanical analysis model of oil engine-floating raft-floor.The flexibility of the raft and the floor are considered according to the admittance theory,and use the power flow as the evaluation index to analyze and discuss the vibration isolation performance of the system.Combining with the criterions and requirements of the floor design,the design value of floor load when using floating raft vibration isolation was determined.A preliminary design is also provided to simplify the design model so that the resonance peaks of the entire oil engine-floating raft-floor system can avoid the vibration frequency of the oil engine.Specifically,the main contents of this paper are as follows:In the first chapter,the background and significance of this study are briefly reviewed.In the second chapter,the admittance matrix of thin plate isolation is deduced,and it provides the theoretical basis for floor vibration.In the third chapter,the causes of the dynamic load of the oil engine and the calculation method are presented,and the vibration of oil machine is measured.In the fourth chapter,the oil engine-floating raft-floor model was established and the dynamic characteristics of the coupled system were deduced based on the admittance theory,whose results show that the floating raft vibration isolation can bring good vibration isolation effect in all frequency ranges.After verifying correctness of the theory,power flow is used as an evaluation index to study the effects of floating raft mass,spring stiffness and damping,floating raft stiffness and floor stiffness on vibration isolation performance.In the fifth chapter,considering the floor design specification requirements.,the design load of the floor when using floating raft vibration isolation is determined,and a simplified design model is provided.The designer can reasonably and conveniently design the system to make the resonance peaks of the entire oil engine-floating raft-floor system avoid the vibration frequency of the oil engine.In the sixth chapter,the paper reviews and summarizes the full text and looks forward to future research directions.This work provides theoretical support and reference suggestions for the design and analysis of floating raft vibration isolation measures aiming to the problem of oil engines on the floor.