Automatic Simulation Modules

The DSHplus Parameter Variation Module and the DSHplus Batch Simulation Module are core modules of the DSHplus Virtual Engineering Lab. By means of these modules the design engineer is able to automate the simulation in order to analyze different parameter configurations or complete system set-ups automatically one after an other.

Linear System Identification

The DSHplus Linear System Identification Module automatically calculates a discrete time transfer function of a single input/output system. Data sources are system state variables of a nonlinear DSHplus simulation model or external data such as measurements from a real system.
Typical applications are identification of measured system dynamic or order reduction of complex nonlinear simulation models.
A special DSHplus time discrete transfer function component seamlessly includes all identified models into the DSHplus simulation.

Frequency Analysis Module

The DSHplus Frequency Analysis Module computes the frequency response of a system using fast furrier transformation techniques (FFT). The transfer function is subsequently displayed in a bode diagram depicting amplitude and phase shift.

Inputs or output may be any state or variable in the model or external data such as measurements of a real system that can be easily imported into DSHplus.

By means of two boundary lines a data interval suitable for calculation can be chosen. If the data is not periodic a weighting function - Hanning, Blackman Harris - can be assigned to improve the calculation. Adjusting the calculation parameter sample block size and number of calculation the DSHplus Frequency Analysis Module it able to perform a sliding analysis of the data. The percentage of the blocks overlap is displayed in the dialog.

Frequency Spectrum Module

There are two methods available to calculate the mean value of the spectrum during the sliding analysis. The RMS Method (Root-Mean-Square) and the Peak-Hold Method. If the rough data is contaminated with noise the DSHplus Frequency Analysis Module offers different cross correlation functions in order to identify the usable signal.

In case the DSHplus Frequency Analysis Module is used in order to analyze simulation results, it is possible to perform an automatically calculation after each simulation run.

The calculated frequency data can be save and the bode diagram can be plotted or copied via clip-board. A power spectrum of input and output is available too

Parameter Optimization Module

Using generic and gradient search algorithms, such as an evolution strategy, the DSHplus Optimization Module automatically performs the variation of selected system parameter in pre-defined ranges. Goal is the minimization of a criterion that has to be defined by the design engineer.

Applied to a meaningful criterion the DSHplus Optimization Module provides the design engineer with a tool that allows an automatic search for the optimal controller gain settings or the best design parameter values such as diameter, spring stiffness etc..

In addition to the DSHplus automatic simulation modules Parameter Variation Module and Batch Simulation Module the DSHplus Optimization Module is a perfect supplement for the virtual engineering process of a fluid power system.

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