摘要老年人跌倒发生率高，跌倒后果严重，且由于老年人骨质疏松易于骨折，跌倒已成为老年人发病和死亡的重要原因之一。如果在跌倒时能提供一个缓冲，损伤的程度将大幅度降低，正如汽车的防撞气囊一样。本课题主要研究如何快速地实时检测人体的跌倒过程。本课题将建立人体平衡状态模型，分析各个参数在人体运动过程中所发生的不同变化，利用Keil软件进行编程，采用ADXL345三轴加速度计测量三个轴向的加速度变化，并将检测到的数据由LPC1114进行反正切等处理之后输出给主机，并利用MATLAB软件对这些实验数据进行整理和分析，拟合出相应的数学函数模型来快速实时地检测出跌倒的过程，为上述系统的研究解决关键问题。42898

关键词  三轴加速度 人体平衡模型 跌倒检测 数学模型

毕业论文设计说明书外文摘要

Title      People fall detection based on the acceleration  sensor                                         

Abstract

The high incidence falls in older people may result in serious consequences.Falls of the elderly have become one of the important reasons of morbidity and mortality because of the osteoporosis and fractures of the elderly.If we can provide a cushion

when the elderly fall just like the airbag of a car,we will significantly reduce 

the extent of damage.The may topic of the project is how to detect the fall of people rapidly during the process. This topic will establish the equilibrium model of people,as well as analyze the different variations of the various parameters in the body during exercise.I used a software named Keil to program.I use an acceleration sensor named ADXL345 to measure the change of the acceleration of three axes and the angle of Z-axes,then,I send the data which have been processed by LPC1114 with arc tangent to the computer.After that,I use MATLAB to collect and analyze experimental data,as well as Fit the corresponding mathematical function model to determine whether the person is about to fall.The project can address the key issues of the whole system. 

Keywords  triaxial acceleration  Body Balance Model  fall detection  mathematical model     

目   次

1  绪论 1

1.1  课题背景及研究意义 1

1.2  国内外研究现状 2

1.3 本人工作 3

1.4 章节安排 4

2  系统总体设计 5

2.1  跌倒保护系统框架 5

2.2  工作原理 5

2.3  硬件设计框架 6

2.4  微控制器模块 6

2.5  三轴加速度传感器模块 8

2.6  SPI通信 9

2.7  数据输出电路设计 9

3  软件设计 11

3.1  软件开发平台 11

3.2  软件编程 11

3.3  串口通信 13

3.4  SPI协议 13

4  实验结果分析 15

4.1  人体建模与运动分析 15