Vibration Characteristics Research On A Bi-stable Structure Applicable To Acceleration Pre-alarm

The comprehensive development of industrialization and intelligentization,especially the rapid development of artificial intelligence in recent years,in which poses a greater challenge for the creative research and development of sensor devices that play an important role.What' remarkable is the sensors' high sensitivity and Practical reliability.In recent years,there is an increasing demand for acceleration sensors and their corresponding pre-alarm.There are many applications in the areas of traditional mechanization such as automobiles,detection of natural disasters and military defense etc.Emerging areas such as intelligent wearable devices,computer hard disks,etc.However,there have some problems among the existing acceleration sensors and their corresponding pre-alarms,such as too large to convenient use,demand for specific light sources and susceptible to environmental conditions and other factors.At the same time,in order to solve the above-mentioned problems,researchers have utilized acceleration vibration excitation that existed in acceleration environment itself,and resonant structure design is performed.However,there are disadvantages such as narrow range of detection and low sensitivity,which severely limits the development of acceleration sensors and their pre-alarms devices.Therefore,based on the current market demand and combined with the research status at home and abroad,bring nonlinear vibration bi-stable in,Take the two-degree-of-freedom(SDOF)bistable vibration structure as the entry point,propose the barrier change theory and design of a two-degree-of-freedom(TDOF)based on the nonlinear vibration bi-stable acceleration pre-alarm structure,what's more,compare with the output of the SDOF structure under the same vibration conditions.Firstly,bring nonlinear vibration bistable into the acceleration Pre-alarm,and utilize the SDOF bistable vibration structure as an entry point to analyze the feasibility of the acceleration Pre-alarm,And how the system parameters that associated with the SDOF bistable vibration structure impact of its output are also studied and analyzed.And then,propose bistable barrier.Secondly,a TDOF acceleration early warning structure design based on bi-stable vibration is proposed by established theory,and feasibility in terms of modeling is demonstrated.Through numerical simulation,the influence of the spacing between magnets and the equivalent spring stiffness on the output of the new structure was studied,and the optimal magnet spacing and equivalent spring stiffness were determined.And under different harmonic excitation amplitude and frequency and random excitation strength,the simulation compares the output of the new structure and the SDOF vibration structure.Finally,an experimental test platform is established to actually restore the conditions that under the above simulations for corresponding experiments,to study the effect of the distance between magnets on the vibration expression of the new structure,and in the daily common harmonic excitation and random excitation with different strengths,compared the SDOF bistable vibration structure and the TDOF structure with output performance,the simulation analysis is mutually verified and a conclusion is drawn.The newly proposed TDOF based bi-stable vibration acceleration pre-alarm structure is in contrast to the SDOF bi-stable vibration structure,whether it is in the case of simple harmonic excitation or random excitation,and whether it is strong or weak conditions,the output is greatly improved,the maximum output can reach 2.5 times in harmonic excitation;output can reach 1.6 times in random excitation.