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第6期 刘耀康:球、柱坐标系中的急动度 47 急动度各分量的成分是以下4种情形之一:(1)各坐标对时间的三阶导数;(2)3个坐标的一阶导 数之积;(3)一个坐标的一阶导数与另一个坐标的一阶导数的二次方之积;(4)一个坐标的一阶导数与 另一个坐标的二阶导数之积 本文给出的是一个求速度、加速度、急动度的通用方法:若位置矢量F=f(q,92,99,其中 1,92,9都是时间t的函数,则速度氵=∑(j(41,92,9,+f(q1,92,93),),只要知道色=b,,+c可 求出即速度.继续把产对:求导不但可求出加速度和急动度,还可求出急动度的一、二阶导数,只是急动 度的一、二阶导数更麻烦,有兴趣者不妨一试。 参考文献: [山黄沛天.从传统牛顿力学到当今猝变动力学)大学物理,2006,25(1):1-3. 21董水金,佘守宪.关于加加速度的若干机械运动分析及MATLAB模拟)大学物理,2005,24(2):57-62. [3叶柏年.点的加加速度力学与实践,1988,10(5):53-55. 【4刘耀康.正交曲线坐标系中加速度的矩阵求法大学物理,1996,15(8):8-11, The jerk in sperical and cylindrical coordinates LIU Yao-kang (Department of Computer Engneerin Sichusn Vocational College f Architecture,Deyang61800,China) Abstract:A method for the jerks in the spherical coordinate and the cylindrical coordinate was given.Firstly the relationships between identity vector and its derivative were found,and then the derivative of accelerations in the two coordinates were educed,the jerks in this two coordinates were deduced by using these relationships. Key words:jerk;spherical coordinate;cylindrical coordinate;identity vector;acceleration (上接第44页) 参考文献: [1张兰知.对重整热力学第二定律理论体系的不同看法)大学物理,2002(8)片34-35. [2]李平.热学M北京:北京师范大学出版社,1987. [3)湛垦华,沈小峰.普利高津与耗散结构理论M.西安:陕西科学技术出版社,1982. 4彼得·柯文尼,罗杰·海非尔德.时间之箭一揭开时间最大奥秘之科学旅到M].江涛,向守平,译。长沙:湖南科学 技术出版社,2005. [5]伊·普利高津.从存在到演化自然科学中的时间及复杂性M曾庆宏,译.上海:上海科学技术出版社,1986 [6张兰知.热力学第二定律的非对称性)大学物理,2001(3):24-25 The concrete thought on reclaiming width of the theory of the second law of thermodynamics ZHANG Lan-zhi School of Seience.Qiqihar University,Qigihar 161006.China) Abstract:The concrete thought on reclaiming width of the theory of the second law of thermodynamics is presented from entropy flowing,entropy bringing and the degradation of energy,the spread of entropy,negative entropy,the duality principle of entropy change in the open system,entropy world view,the arrow of time the natural disposition concept of the second law of thermodynamics. Key words:the second law of thermodynamics;entropy;theory 万方数据第6期 刘耀康:球、柱坐标系中的急动度 47 急动度各分量的成分是以下4种情形之一:(1)各唑标对时间的三阶导数;(2)3个坐标的一阶导 数之积;(3)一个坐标的一阶导数与另~个坐标的一阶导数的二次方之积;(4)一个坐标的一阶导数与 另一个坐标的二阶导数之积. 本文给出的是一个求速度、加速度、急动度的通用方法:若位置矢量F=∑Z(q。,q:,q3弦i,其中 f 口】,q2,93都是时间f的函数,则速度F=E(L(ql,q2,q3赡+^(9J,q2,q3)色),只要知道占f=6j吾』+Ck占女可 j 求出F即速度.继续把声对t求导不但可求出加速度和急动度,还可求出急动度的一、二阶导数,只是急动 度的一、二阶导数更麻烦,有兴趣者不妨一试. 参考文献: 【l】黄沛天.从传统牛顿力学到当今猝变动力学岍.大学物理,2006,25(1):l一3. t2】董水金,佘守宪.关于加加速度的若干机械运动分析及MATLAB模拟[J].大学物理,2005,24(2):57-62 【3】叶柏年.点的加加速度【J】.力学与实践,1988,10(5):53—55. 【4】刘耀康.正交曲线坐标系中加速度的矩阵求法【J】.大学物理,1996,15(8):8-1 1. The jerk in sperical and cylindrical coordinates LIU Yao——kang (Department ofComputer Engineering,Siehuan Vocational College ofArchitecture,Deyang 618000,China) Abstract:A method for the jerks in the spherical coordinate and the cylindrical coordinate was given.Firstly the relationships between identity vector and its derivative were found,and then the derivative of accelerations in the two coordinates were educed,the jerks in this two coordinates were deduced by using these relationships. Key words:jerk;spherical coordinate;cylindrical coordinate;identity vector;acceleration (上接第44页) 参考文献: 【1】张兰知.对重整热力学第二定律理论体系的不同看法【J].大学物理,2002(8):34—35. 【2】李平.热学【M】.北京:北京师范大学出版社,1987. [3】湛垦华,沈小峰.普利高津与耗散结构理论IM】.西安:陕西科学技术出版社,1982. 【4】彼得·柯文尼,罗杰·海菲尔德.时间之箭——揭开时间最大奥秘之科学旅程【M】.江涛,向守平,译.长沙:湖南科学 技术出版社,2005. 【5】伊·普利高津.从存在到演化自然科学中的时间及复杂性【M】.曾庆宏,译.上海:上海科学技术出版社,1986. 【6】张兰知.热力学第二定律的非对称性【J].大学物理,2001(3):24—25. The concrete thought on reclaiming width of the theory of the second law of thermodynamics ZHANG Lan—zhi (School ofScience,Qiqihar University,Qiqihar 161006,China) Abstract:The concrete thought on reclaiming width of the theory of the second law of thermodynamics is presented from entropy flowing,entropy bringing and the degradation of energy,the spread of entropy,negative entropy,the duality principle of entropy change in the open system,entropy world view,the alTOW of time the natural disposition concept of the second law of thermodynamics. Key words:the second law of thermodynamics;entropy;theory 万方数据
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