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Released in October 2017, RecurDyn V9R1 has enhanced modeling capabilities and contact analysis for MBD (Multi-Body Dynamics) analysis. Upgrading the Mesher core engine for easier and more accurate MFBD (Multi-Flexible Body Dynamics) analysis and adding new toolkits for multidisciplinary analysis solutions implemented in one environment will maximize user’s design performance.

Let’s take a closer look at the TSG (Time Signal Generator) toolkit in this article.

The TSG enables RecurDyn to be used as a virtual test rig. It enables RecurDyn to rapidly find the Drive Signal that reproduces the Target Signal in computationally efficient, reduced complexity models. The simplified virtual test-rig model eliminates various nonlinearities of the actual test environment, and enables faster and simpler dynamic analysis.

This article is for the introduction of TSG Toolkit and TSG Tutorial.

An additional license is required to use  TSG Toolkit

If you would like to use TSG Toolkit, please refer to 'How to apply for trial license of TSG Toolkit' below.

TSG (Time Signal Generator) Overview

The TSG finds a Drive Signal that causes the MBD system in RecurDyn to produce a measurable system response that is similar to a user-defined Target Signal To generate a Drive Signal, iterative simulation is performed to reproduce the desired the Target Signal.

Background

• In general, the responses of a mechanical system is measured at several places of it. (Acceleration, Velocity, Position, Force and others)
• This known response is referred to as the Target Signal.
• The measured data from the experiment usually cannot be used for MBD/MFBD model.
• They are the output signal of the specific location, it is difficult to apply it to RecurDyn model directly.
• Most mechanical systems are highly nonlinear with many complex components so that those output signals are difficult to be used in a MBD/MFBD model.
• In order to reproduce the desired response in the testing environment, appropriate Drive Signals are needed.

Procedure of TSG

• Create sensors where the response of a real system is measured in a RecurDyn model.
• Create actuators to produce the response in a RecurDyn model.
• With the iterative simulation, RecurDyn/TSG finds the proper Drive Signal to reproduce the Target Signal.
• If the responses of the sensors are similar to the measured Target Signals, then RecurDyn model can be regarded that it is actuated similarly to the real system.

TSG Terminology

• Actuator: Drives the system at a various location of the system. It is defined using a Joint Motion or a Force in a MBD model. (using a function, ‘TACT(…)’ in an expression)
• Sensor: The response of a system is calculated using sensors. Eventually, the responses of the sensors should match the user-defined Target Signals closely.

• Target Signals: User-Defined Signals that was measured from experiment which should be reproduced using the appropriate Drive Signals.
• Response Signals: Outputs of RecurDyn at the location of the virtual Sensors. Using iterative simulation, the response signal at the end of the process should match the Target Signals.
• Drive Signals: Inputs of MBD model at the location of the virtual actuators.

Features of RecurDyn/TSG

Actuator, Sensor, Target, FRF, Iteration, and Result

TSG Tutorial

TSG Toolkit Tutorial & Example files

• Download (PDF)
  
• Download (Example)