Andrew's Mechanism 2005-08-30 Dynamic simulation of the Andrew's squeezing mechanism Laboratorio de Ingeniería Mecánica Manuel González Castro Manuel González Castro González Castro Manuel J. Lolo Universidad de la Coruña Laboratorio de Ingeniería Mecánica Escuela Politécnica Superior lolo@cdf.udc.es +34 981337400 Mendizabal s/n Ferrol 15403 España

This plane mechanism is composed by 7 bodies interconnected by revolute joints. The assembly is driven by a motor located at point O, with a constant drive torque of 0.033 Nm. This system has a very small time scale, thus making it difficult to simulate for solvers that can't reach small time-steps.

Andrew squeezing mechanism

The analysis to be performed is a dynamic simulation with a duration of 0.5 seconds. Initially, the system is at rest and the β angle has a value of -0.0620 rad.

The reference solution for this problem is the time-history of the position of point F (x and y coordinates). The maximun allowed errors are 1.0E-1 (low precission) and 1.0E-3 (high precission), measured with 2000 output steps and a threshold value of 1.0E-5.

The following information is provided:

  1. Time-history of the position of point F, as text data file: A03_solution_data.txt
  2. Animation of the system, as AVI movie (first 0.05 s): A03_solution_movie.avi
  3. Time-history of the position of point F, as plot (first 0.05 s):
    Time-history of the coordinates of point F
CPU-time spent by the software to solve the problem (in s).