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songjunann

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[求助] 请教什么是什么是同伦约束(holonomic constraint),谢谢

请教一下什么是同伦约束,holonomic constraint,能否具体解释一下(越多越好),或者好的资料可以看看,谢谢
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acmuser

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【答案】应助回帖

感谢参与,应助指数 +1
http://en.wikipedia.org/wiki/Holonomic_constraints
http://www8.cs.umu.se/kurser/TDBD24/VT06/lectures/Lecture8.pdf
http://www.phys.ttu.edu/~cmyles/Phys5306/Lectures/Lecture03.ppt
In general, constraints are expressed as a mathematical relation or relations between particle coordinates & possibly the time.
Eqtns of constraint are relations like:
                        f(r_1,r_2,r_3,…r_N,t) = 0
Constraints which may be expressed as above are Holonomic Constraints.
Example of Holonomic Constraint: Rigid body. Constraints on coordinates are of the form:
                        (r_i - r_j)^2 - (c_{ij})^2 = 0  
                        c_{ij} = some constant
Constraints not expressible as f(ri,t) = 0 are Non-Holonomic Constraints
Example of Non-Holonomic Constraint: Particle confined to surface of rigid sphere, radius a:          r^2 - a^2 >= 0
Time dependent constraints:  Rhenomic or Rhenomous Constraints.
If constraint eqtns don’t explicitly contain time:  Fixed or Scleronomic or Scleronomous Constraints.
2楼2012-05-14 18:52:45
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