Time Domain Analysis

NI MAX Control Design Steps

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Time Domain Analysis

Creates generic linear simulations and time domain plots for step inputs, impulse inputs, and initial condition responses.

Parameter	Description
Output	Displays the output of the time domain analysis. The graph displays the individual trajectory responses of each state of the system. One of the following graphs appears: Step Response—Plots the output of the system when it is excited by a step input. The initial states of the system are assumed to be zero. This graph appears if you select Step from the Time Analysis pull-down menu on the Configuration tab. Impulse Response—Plots the output of the system when it is excited by an impulse (delta) or by a pulse (Kronecker) signal. The step uses an impulse for a continuous model and a pulse for a discrete model. This graph appears if you select Impulse from the Time Analysis pull-down menu on the Configuration tab. Initial State Response—Plots the calculated response of the natural or zero-input response of the system to a specific initial state value. This graph appears if the input Model is a state-space model and you select Initial State from the Time Analysis pull-down menu on the Configuration tab. Initial Conditions Response—Plots the calculated response of the natural or zero-input response of the system to a specific initial output condition. This graph appears if you select Initial Conditions from the Time Analysis pull-down menu on the Configuration tab. Simulated Response—Plots the calculated response of the output when the given system is excited with Input Signal. This graph appears if you select Linear Simulation from the Time Analysis pull-down menu on the Configuration tab.
State Trajectories	Displays the state trajectories of the model. The State Trajectories tab appears if you select a state-space model from the Model pull-down menu on the Input Data tab.
Input Data	Contains the following option: Model—Specifies the model you want to analyze.
Configuration	Contains the following options: Time Analysis—Specifies the type of time analysis you want to perform. You can select one of the following options: Step—Calculates the output of the system when it is excited by a step input. The initial states of the system are assumed to be zero. Impulse—Calculates the output of the system when it is excited by an impulse (delta) or by a pulse (Kronecker) signal. The step uses an impulse for a continuous model and a pulse for a discrete model. Initial State—Calculates the natural or zero-input response of the system to a specific initial output state. This option appears if you select a state-space model from the Model pull-down menu on the Input Data tab. Initial Conditions—Calculates the natural or zero-input response of the system to a specific initial output condition. This option appears if you select a transfer function or zero-pole-gain model from the Model pull-down menu on the Input Data tab. Linear Simulation—Calculates the output when the given system is excited with the inputs. Input Signal—Specifies the input signal the step uses to obtain the response of the system model through linear simulation. This option appears when you select Linear Simulation from the Time Analysis pull-down menu. Initial Time (s)—Specifies the initial time (or t0) for the responses. For linear simulation, the Control Design Assistant obtains the value of Initial Time (s) from the waveform. Interval (s)—Specifies the interval time. If you select Continuous, this time specifies the time between samples for simulation. If you select Discrete or Linear Simulation, this time is the discrete sampling time, which you cannot modify. Final Time (s)—Specifies the final time, in seconds, you want to simulate. If you select Linear Simulation, you cannot use the Final Time (s) control. Initial Conditions—Defines the initial condition of the simulation. This option appears if you select a transfer function or zero-pole-gain model from the Model pull-down menu on the Input Data tab. Initial States—Defines the initial state of the simulation. This option appears if you select a state-space model from the Model pull-down menu on the Input Data tab.
Parametric Data	Contains the following options: Parametric Data Step Response—Displays the parametric data of the step response model. The table includes data for Signal, Peak Time (s), Peak Value/Overshoot (Mp) [%], Settling Time (s), Steady State Value/Error, and Rise Time (s). Peak Time (s) is the time required for the dynamic system response to reach the peak value of its first overshoot. Overshoot (Mp) [%] is the dynamic system response value that most exceeds unity, expressed as a percent. Settling Time (s) is the time required for the response to reach 1% of its final value. Steady State Value is the final value of the signal after transient responses have decayed. Rise Time (s) is the time required for the dynamic system response to rise from 10% of its final value to 90% of its final value. Parametric Data Impulse Response—Displays the parametric data of the impulse response model. The table includes data for Signal, Peak Time (s), Peak Value, and Settling Time (s). Peak Time (s) is the time required for the dynamic system response to reach the peak value of its first overshoot. Settling Time (s) is the time required for the response to reach 1% of its final value. Parametric Data Initial Response—Displays the parametric data of the initial response model. The table includes data for Signal, Peak Time (s), and Peak Value. Peak Time (s) is the time required for the dynamic system response to reach the peak value of its first overshoot. Parametric Data Simulated Response—Displays the parametric data of the simulated response model. The table includes data for Signal, Minimum Value, and Maximum Value.

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