Indoor Vibration And Noise Research Considering Elevator Car-structure Coupling Effect

If humans are exposed to severe environmental noise for a long time,it will cause irreversible damage to the physical and mental health of the human body.The recently passed "Noise Pollution Prevention and Control Law of the People’s Republic of China" puts forward mandatory requirements for the prevention and control of various types of noise.In order to save land resources,a large number of high-rise buildings are being built in the city.At the same time,elevators need to be installed in the renovation of old residential areas.The use of elevators has increased sharply,and most buildings have not considered vibration and noise pollution caused by elevator operation during design and construction.Therefore,residents complained more and more frequently about this,and even caused social conflicts.The problem of building indoor vibration and secondary noise caused by elevator operation needs to be solved urgently.It is of great significance to study the building indoor vibration and secondary noise caused by elevator operation through scientific methods.Taking a high-rise building as an example,an in-depth study of the vibration and secondary noise caused by the operation of the elevator car in the building’s living room is carried out.Various types of buildings provide universal reference.The work is as follows:(1)In order to study the indoor vibration and noise response characteristics caused by the operation of the elevator car,a field test was carried out on the living room adjacent to the elevator shaft in a high-rise building.The test identifies the natural vibration frequencies of each wall and floor,analyzes the time-history spectrum characteristics of the vibration and noise responses at key indoor measuring points,and evaluates the indoor vibration and secondary noise when the elevator car is running.(2)The analysis model of the elevator car-structure coupled vibration system is established.The coupled vibration system is divided into the elevator car-guide shoe system and the structure-guideway subsystem.The elevator car-guide shoe system is considered as a multi-body with 18 degrees of freedom.The dynamic equation fully considers the movement of the elevator car in space;the structure-guideway subsystem is established by finite element software,and the role of non-structural components is fully considered;the separation iteration method is used to solve the problem,and the measured results and simulation results are carried out.The comparison verifies the accuracy of the established analytical model.Using this calculation model,the time-frequency spectrum variation law of indoor vibration response under different parameters is analyzed,and suggestions for vibration and noise reduction measures are put forward.(3)The indoor secondary noise calculation model is established by the finite element method,the acoustic finite element model is established according to the real geometric shape of the structure,the vibration velocity of each panel output by the structural vibration calculation model is extracted,and the boundary condition of the acoustic finite element is used to calculate the structure sound field.The sound pressure at key points is used to verify the accuracy of the numerical model using the measured data.This model is used to further analyze the spatial distribution characteristics of indoor secondary noise,and the influence of different parameter changes on indoor secondary noise.