1、This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller
2、and DS18B20 temperature sensor.例 9-11300mmW=5kN6m1m计算： 1. 木柱最大正应力？ 2. 在木柱上端垫 20mm的橡皮，木柱最大正应力为多少？第 9章 能量原理9-6 冲击木拄： E=10GPa 橡胶： E=8MPa解： （ 1）不垫橡皮1This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by
3、using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.W=5kN6m1m第 9章 能量原理9-6 冲击300mm解： （ 2）垫橡皮例 9-11计算： 1. 木柱最大正应力？ 2. 在木柱上端垫 20mm的橡皮，木柱最大正应力为多少？木拄： E=10GPa 橡胶： E=8MPa2This paper
4、mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20
5、 temperature sensor.第 9章 能量原理9-6 冲击已知： W， v求： kd，例 9-12 水平冲击解：根据能量守恒定律：冲击前的动能全部转换为弹性体系的变形能设3This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 a
6、nd single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.第 9章 能量原理9-6 冲击减少冲击的不利影响应减小动荷系数 kd,如何减小动荷系数 kd？应加大静荷位移 st。在杆件承受冲击时应该采用降低刚度的办法来减缓冲击作用。另外，还经常采用安装缓冲装置，主要是各种弹簧，以降低动荷系数。如在汽车大梁和汽车底盘的前后轴之间安装钢板弹簧等。4This paper mainly introduces the de
7、sign of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.例 9-
8、13 起重机吊索下端与重物之间有一缓冲弹簧，每单位力引起的伸长为 ，吊索横截面面积 ，弹性模量 ，所吊重物重量为 W=50KN 。以等速v=1m/s下降，在 L=20m时突然刹车，求吊索内的应力 (吊索和弹簧的质量不计 )。解： 根据重物冲击过程中释放的能量 (包括动能和势能 )转化为吊索增加的变形能计算。吊索和弹簧的静变形：在重物的速度 v0的同时， 吊索和弹簧的变形增加 ,即动变形为 。所以 =13.48cm第 9章 能量原理v L5This paper mainly introduces the design of an intelligent temperature control s
9、ystem which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.因为（ a）经过整理， (a)式变为解得 变形增加量为第 9章 能量原理6This paper
10、mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20
11、 temperature sensor.吊索和弹簧的最大伸长量所以动荷系数为=1.87吊索内的应力第 9章 能量原理7This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The
12、 core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.如果吊索和重物之间没有弹簧，则由此可见弹簧所起的缓冲作用。第 9章 能量原理8This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus
13、 digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.第 10章 超静定结构10-1 超静定结构的概念及其分析方法1）工程实例9This paper mainly introduces the design of an intelligent temperature control system which realizes the
14、 function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.第 10章 超静定结构10-1 超静定结构的概念及其分析方法1）工程实例10This paper mainly introduces the d
15、esign of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.第 1
16、0章 超静定结构10-1 超静定结构的概念及其分析方法1）工程实例11This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the
17、system are AT89C51 microcontroller and DS18B20 temperature sensor.第 10章 超静定结构10-1 超静定结构的概念及其分析方法2）超静定结构的概念超静定次数 : 多余约束个数 . 静定结构 超静定结构，有一个多余约束 比较法 :与相近的静定结构相比 , 比静定结构多几个约束即为几次超静定结构 .12This paper mainly introduces the design of an intelligent temperature control system which realizes the function of t
18、emperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.第 10章 超静定结构10-1 超静定结构的概念及其分析方法2）超静定结构的概念超静定次数 : 多余约束个数 . 若一个结构有 N个多余约束 ,则称其为 N次 超静定结构
19、.力法基本体系不唯一 .几次超静定结构 ?13This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are A
20、T89C51 microcontroller and DS18B20 temperature sensor.第 10章 超静定结构2）超静定结构的概念14This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip
21、microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.一个无铰闭合框是三次超静定第 10章 超静定结构2）超静定结构的概念15This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by u
22、sing single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.去掉一个固定端支座或切断一根弯曲杆相当于去掉三个约束 .将刚结点变成铰结点或将固定端支座变成固定铰支座相当于去掉一个约束 .几何可变体系不能作为基本体系第 10章 超静定结构16This paper mainly introduces the des
23、ign of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.3)超静定
24、结构的静力特征和几何特征静力特征 :仅由静力平衡方程不能求出所有内力和反力 .超静定问题的求解要同时考虑结构的 “几何，物理，静力 ” 条件 .几何特征 :有多余约束的几何不变体系。第 10章 超静定结构10-1 超静定结构的概念及其分析方法17This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digit
25、al temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.与静定结构相比 , 超静定结构的优点为 :1.内力分布均匀2.抵抗破坏的能力强1.内力与材料的物理性质 、 截面的几何形状和尺寸有关 。4)超静定结构的性质2.温度变化、支座移动一般会产生内力 。第 10章 超静定结构10-1 超静定结构的概念及其分析方法18This paper mainl
26、y introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temp
27、erature sensor.3)超静定结构的静力特征和几何特征1.力法 -以多余约束力作为基本未知量 。4)超静定结构的性质2.位移法 -以结点位移作为基本未知量 .5)超静定结构的计算方法3.混合法 -以结点位移和多余约束力作为基本未知量 .1)工程实例2)超静定结构的概念第 10章 超静定结构10-1 超静定结构的概念及其分析方法本课程只讲解力法 19This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temp
28、erature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.3)超静定结构的静力特征和几何特征4)超静定结构的性质5)超静定结构的计算方法1)工程实例2)超静定结构的概念第 10章 超静定结构10-1 超静定结构的概念及其分析方法力法等方
29、法的基本思想 :1.找出未知问题不能求解的原因 ,2.将其化成会求解的问题 ,3.找出改造后的问题与原问题的差别 ,4.消除差别后 ,改造后的问题的解即为原问题的解20This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and singl
30、e chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.第 10章 超静定结构10-2 用力法分析超静定结构待解的未知问题基本体系变形条件在变形条件成立条件下在变形条件成立条件下 ,基本体基本体系的内力和位移与原结构相同系的内力和位移与原结构相同 .力法基本未知量21This paper mainly introduces the design of an intelligent temperature control s
31、ystem which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.一 .力法的基本概念力法力法方程方程M10-2 用力法分析 超静定结构M111MF1F第 10章
32、 超静定结构1122This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microc
33、ontroller and DS18B20 temperature sensor.一 .力法的基本概念力法力法方程方程力法步骤力法步骤 :1.确定基本体系2.写出位移条件 ,力法方程3.作单位弯矩图 ,荷载弯矩图 ;4.求出系数和自由项5.解力法方程6.叠加法作弯矩图10-2 用力法分析 超静定结构第 10章 超静定结构23This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measureme
34、nt and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.力法步骤力法步骤 :1.确定基本体系 4.求出系数和自由项2.写出位移条件 ,力法方程 5.解力法方程3.作单位弯矩图 ,荷载弯矩图 ; 6.叠加法作弯矩图作弯矩图 .练习10-2 用力法分析 超静定结构一 .力
35、法的基本概念FllEIEI第 10章 超静定结构24This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system ar
36、e AT89C51 microcontroller and DS18B20 temperature sensor.F解 :10-2 用力法分析 超静定结构lM1FllEIEIFFl MFM第 10章 超静定结构25This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature s
37、ensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.力法基本思路小结力法基本思路小结解除多余约束，转化为静定结构。多余约解除多余约束，转化为静定结构。多余约束代以多余未知力束代以多余未知力 基本未知力基本未知力 。分析基本结构在单位基本未知力和外界因分析基本结构在单位基本未知力和外界因素作用下的位移，建立素作用下的位移，建立 位移协调条件位移协调条件 力力法方程法方程 。从
38、力法方程解得基本未知力，由从力法方程解得基本未知力，由 叠加原理叠加原理获得结构内力。获得结构内力。 超静定结构分析通过转化为超静定结构分析通过转化为静定结构获得了解决。静定结构获得了解决。10-2 用力法分析 超静定结构第 10章 超静定结构26This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digi
39、tal temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.将未知问题转化为将未知问题转化为已知问题，通过消除已已知问题，通过消除已知问题和原问题的差别，知问题和原问题的差别，使未知问题得以解决。使未知问题得以解决。这是科学研究的这是科学研究的基本方法之一。基本方法之一。第 10章 超静定结构27This paper mainly introduc
40、es the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature se
41、nsor.1.梁与刚架2.桁架第 10章 超静定结构3.组合结构28This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the s
42、ystem are AT89C51 microcontroller and DS18B20 temperature sensor.例 1. 力法解图示桁架 .EA=常数 .解 : FaaFFF 0 0F0 0FNF FN11111 1-F/2-F/2F/2F/2第 10章 超静定结构29This paper mainly introduces the design of an intelligent temperature control system which realizes the function of temperature measurement and control by using single bus digital temperature sensor DS18B20 and single chip microcomputer. The core components of the system are AT89C51 microcontroller and DS18B20 temperature sensor.解：例 2. 求解图示加劲梁。横梁当有无下部链杆时梁内最大弯矩之比：有无下部链杆时梁内最大弯矩之比：通过改变连杆的刚度通过改变连杆的刚度来调整梁内弯矩分布来调整梁内弯矩分布 . M(kNm),FN(kN)MF (kNm),FNF(kN)30
