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  1. Saleh abbasi

    Adams/Matlab: Setting Up and Modifying Design Variables in Matlab

    I understand. I thought it was a tool in the adams. In creating a control plant, we can only use system elements variables type, while in defining spring, we cannot. Just design variables can set spring or other that related to model structure, like sphere radius, friction coefficients etc. I...
  2. Saleh abbasi

    Adams/Matlab: Setting Up and Modifying Design Variables in Matlab

    İ don't know what is MUX, i solved problem of use torque instead of torsion spring. Now it's ok, but if i want to change other design parameters, how can i do that?
  3. Saleh abbasi

    Adams/Matlab: Setting Up and Modifying Design Variables in Matlab

    i want to optimize 2 torsion spring of my model with my algorithm that wrote in matlab. i create design variables, for set spring stiffness coefficient we cant create system elements. k1 and k2 is stiffness coefficient that i want to optimize them. i set control plant : freq is frequency of...
  4. Saleh abbasi

    Adams/Matlab: Setting Up and Modifying Design Variables in Matlab

    thanks for your reply. Are you referring to creating Adams models with varying parameter values and link them to Simulink? For the optimization process, the parameters are determined dynamically by the relevant algorithm. As a result, it’s not feasible to pre-create Adams model and then send it...
  5. Saleh abbasi

    Adams/Matlab: Setting Up and Modifying Design Variables in Matlab

    Hi everyone, I can create a control plant from my Adams model to run in Simulink. How can I change the design variables initially? I need to modify torsion springs, some lengths, etc., directly from Simulink. I want to optimize my model, so I need to adjust these variables.
  6. Saleh abbasi

    Small contact region in COMSOL

    I want to create contact between two parts in COMSOL. One of them is fixed (ground), and the other one is a small part with a very small contact region (approximately 0.01 mm² or less). Which method and parameters would be suitable for creating this contact? Does changing the mesh size affect...
  7. Saleh abbasi

    Special General Motion in ADAMS

    varval(41) is vibration (A*sin(2*pi*f*time)), and don't have any problem in simulate. Does changing units in a simulation affect the solution method used by the solver? in this case legs is solid, but for better simulation we also try simulate flexible legs too, that legs fixed in base instead...
  8. Saleh abbasi

    Special General Motion in ADAMS

    for better describe of my problem: define markers: define motion from markers: simulate and errors in two step size (1e-5(or bigger) and 1e-6), varval(41) is A*sin(wt): I cant find any redundant constraint in model. Also when in motion insert X direction motion free I get this error in 2...
  9. Saleh abbasi

    Special General Motion in ADAMS

    I try to simulate this Model : PZT(Piezoelectric) is actuator of this robot. I try to create Vibration in direction that draw in previous image with general motion. robot can translate in X and Y direction(Global) (Y direction is free for any jumping and etc.) and can rotate about Z axes (model...
  10. Saleh abbasi

    Special General Motion in ADAMS

    Hello, I have a problem in describe a motion in this body, i want rectangular body have a vibration in direction that I draw. I try to create this with using general motion or planar joint, part can translate in X,Y and rotate in Z, but also must always have this vibration in y direction of...
  11. Saleh abbasi

    Create normal force function in ADAMS contact force

    I created a contact force in adams, in contact force we have 2 methods to calculate normal force, but both of them have problem in my issue. I want to create a function to calculate the normal force that the object does not cross the plane, for example in the impact formula we have...
  12. Saleh abbasi

    Create DLL file in ADAMS

    Adams write that files compiled with Intel parallel xe 2019 update 4, this software have Fortran compiler and Visual Studio 2017 for c++ compiler, but now Visual Studio 2017 and this intel can't be integrate together, but it's no matter which version we used, just they must can be integrate. To...
  13. Saleh abbasi

    Create DLL file in ADAMS

    yes, i run a sfosub_sample.c for test and get this error too.
  14. Saleh abbasi

    Create DLL file in ADAMS

    I want to create DLL file for using in ADAMS at motion, so i found a code in Fortran with name motsub1.f, I am beginner in Fortran and just change of this code VALUE and do steps in image to create DLL of it, but i get error, what is ifort and link.exe?
  15. Saleh abbasi

    Tangential force between two body at contact force

    I'm currently working with two bodies that are i defined contact force with each other in ADAMS, and I've been able to calculate the normal force (F_y) during their impact. However, I'm also interested in determining the tangential force that arises during the impact. If I were to introduce...
  16. Saleh abbasi

    Constant torque in pendulum

    Thanks to Jennifer James for suggesting the change solver that helped me to solving problem with WSTIFF integrator. Does Adams have a solver like ode45 in MATLAB, which uses the Runge-Kutta method? Additionally, if we can't determine the formula of the model, how can we validate the results...
  17. Saleh abbasi

    Constant torque in pendulum

    The gravity was not considered in the model, and no other forces were included aside from torque. Although the formula is correct (you can check it, or determine it with Lagrangian method), I need to validate the simulation for my main model - the RRR manipulator. However, since the results...
  18. Saleh abbasi

    Constant torque in pendulum

    To simplify the model, I have inserted a point mass body in the end of the link, which has a spherical shape. This ensures that the moments of inertia along the x, y, and z axes (I_xx, I_yy, and I_zz) are zero. Even if these values were not zero, the same problem would still exist. The length of...
  19. Saleh abbasi

    Constant torque in pendulum

    As you can see the Angular Acceleration changed. I try all measures (from torques, body and joint) all results is same, also i create an angle measure an derivates it, the result is same.
  20. Saleh abbasi

    Constant torque in pendulum

    Hello everyone, I apologize for using this platform to ask my question. In Adams software, I am currently working on a simulation where I am applying a constant torque to a link that behaves like a pendulum. The system has no other forces acting on it, such as gravity or friction. According to...

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