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Manufacturing

RecurDyn V9R2 capability to include FFlex bodies in co-simulations with Particleworks

RecurDyn V9R2 capability to include FFlex bodies in co-simulations with Particleworks

In earlier versions of RecurDyn and Particleworks the fluid particles could only interact with rigid bodies. Now, RecurDyn V9R2 has the capability to include FFlex bodies in co-simulations with Particleworks. An interesting tutorial uses the example of a styler steam clothing care system to teaches how to perform a co-simulation between RecurDyn and Particleworks. The co-simulation illustrates the dynamic interaction between the shaking mechanism and the flexible bodies (representing the clothes) in RecurDyn and the fluid particles of Particleworks that represent the steam.

The styler unit, shown in the image, is used to shake off the dust attached to cloth and to remove its wrinkles with steam. It also reduces the odors and allergens in the clothing.

The tutorial analyzes the dynamic interaction between an item of clothing, which is expressed as a flexible body, and the steam, which is expressed as particles.

After the co-simulation, an analysis is made of the stress in the clothing as the particles touch the flexible body, using the Contour function of RecurDyn.

To learn more about the styler unit, perform a search on your favorite search engine using the text: “styler steam clothing care system.”

The Styler co-simulation video covers the following topics (with time stamps): Creating walls (0:30), Exporting walls (1:55), Creating steam particles (2:16), Setting fluid properties (3:26), Co-simulation (7:32), Post-processing (8:45)

Click play below to watch the video (approx. 9:38).

More examples of RecurDyn and Particleworks co-simulation in action:

RecurDyn and Particleworks co-simulation: Washing machine

Concept for a self-correcting sheet metal bending operation

Concept for a self-correcting sheet metal bending operation

U. Damerow, D. Tabakajew, M. Borzykh, W. Schaermann, W. Homberg, A. Trachtler, Procedia Technology, 2014, Volume 15, pp 439-446.

Abstract

Geometrical deviations can appear in the production of plug contacts used in electrical connection technology and in fittings for the furniture industry. The reasons for this can be a variation in the properties of the semi-finished product, or wear phenomena on the forming machine itself or on the bending tools. When geometrical deviations appear, the process parameters normally have to be adjusted manually. Finding the most appropriate process parameters is currently done manually and is thus very time consuming. In order to reduce the scrap rate and the setup time for production scenarios, a concept for self-correcting bending operations is being developed using the V-model of the VDI guideline 2206. In this case, the V-model will make it possible to set up a self-correcting control strategy consisting of a closed-loop control approach, measurement devices and actuators. Having implemented these components in the forming machines, it will be possible to recognize geometrical deviations automatically and to take corrective action during production, aiming at a reduction of the scrap rate and setup-time.

How Multibody Dynamics Simulation Technology is Used

RecurDyn was used to simulate sheet metal bending operations. A RecurDyn model has a major advantage over traditional FEA models when it comes to designing a control strategy for bending operations. RecurDyn simulations can determine what corrective actions need to be taken when geometrical deviations appear.

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Compensation of geometrical deviations via model based-observers

Compensation of geometrical deviations via model based-observers

B.Denkena, L.Overmeyer, K.M.Litwinski, R.Pesters, 2014, The International Journal of Advanced Manufacturing Technology, July 2014, Volume 73, Issue 5, pp 989-998.

A method for reducing the energy consumption of pick and place industrial robots

A method for reducing the energy consumption of pick and place industrial robots

M. Pellicciari, G. Berselli, F. Leali, A. Vergnano, Mechatronics, April 2013, Volume 23, Issue 3, pp. 326-334.

Implementation of LabVIEW®-based joint-linear motion blending on a lab-manufactured 6-axis articulated robot (RS2)

Implementation of LabVIEW®-based joint-linear motion blending on a lab-manufactured 6-axis articulated robot (RS2)

Dong Sun Lee, Won Jee Chung, Chang Doo Jung, Jun Ho Jang, International Conference on Mechatronics and Automation (ICMA), August 2012, pp. 2423-2428.

  • Abstract

    For fast and accurate motion of 6-axis articulated robot, more noble motion control strategy is needed. In general, the movement strategy of industrial robots can be divided into two kinds, PTP (Point to Point) and CP (Continuous Path). In recent, industrial robots which should be co-worked with machine tools are increasingly needed for performing various jobs, as well as simple handling or welding. Therefore, in order to cope with high-speed handling of the cooperation of industrial robots with machine tools or other devices, CP should be implemented so as to reduce vibration and noise, as well as decreasing operation time. This paper will realize CP motion (especially joint-linear) blending in 3-dimensional space for a 6-axis articulated (lab-manufactured) robot (called as “RS2”) by using LabVIEW® [6] programming, based on a parametric interpolation. Another small contribution of this paper is the proposal of motion blending simulation technique based on Recurdyn® V7, in order to figure out whether the joint-linear blending motion can generate the stable motion of robot in the sense of velocity magnitude at the end-effector of robot or not. In order to evaluate the performance of joint-linear motion blending, simple PTP (i.e., linear-linear) is also physically implemented on RS2. The implementation results of joint-linear motion blending and PTP are compared in terms of vibration magnitude and travel time by using the vibration testing equipment of Medallion of Zonic®. It can be confirmed verified that the vibration peak of joint-linear motion blending has been reduced to 1/10, compared to that of PTP.

    How Multibody Dynamics Simulation Technology is Used

    RecurDyn was used to determine whether changing the velocity profile of a 6-axis articulated robot would result in stable motion of the end-effector. Efficiency of the robot is improved by implementing a control strategy that limits vibration and noise.

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A New Method for Simulation of Machining Performance by Integrating Finite Element and Multi-body Simulation for Machine Tools

A New Method for Simulation of Machining Performance by Integrating Finite Element and Multi-body Simulation for Machine Tools

M. Zaeh, D. Siedl, 2007, CIRP Annals – Manufacturing Technology, 2007, Volume 56, Issue 1, pp 383–386.

Abstract

Machine tools need to work accurately and highly dynamically to keep up with the requirements of modern machining processes. Besides the technical issues, time to market is too short to build a real prototype in future. This leads to the necessity for a method which enables the forecast of the future machine performance. To predict the machining results exactly, large movements on flexible structures have to be calculated. With the specific integration of FEA and MBS for the domain of machine tools it is possible to predict the dynamic machine behaviour. The simulation system is based on the relative nodal method for large deformation problems. A model of a machine tool with all relevant components was simulated and matched with experiments to demonstrate the approach.

How Multibody Dynamics Simulation Technology is Used

This paper presents a method to predict machining performance. RecurDyn simulations can provide accurate results for flexible structures with large deformations. Implementing RecurDyn simulations into the design process can reduce time to market and reduce the money spent on physical prototypes.

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