Method for simulating an N1 and N2 speed vibration composite input for development and/or model based testing of engine control hardware and embedded software

A method of generating input signals for an electronic engine control (EEC) module by using a first and second waveform generator and a voltage-to-charge (V/Q) converter, the method comprising:

• generating, by the first waveform generator:
• a simulated first speed signal that is representative of a first speed;
• and
• a vibration modulating signal that is representative of the first speed;
• inputting, from the first waveform generator to the second waveform generator, the vibration modulating signal;
• generating, by the second waveform generator:
• a simulated second signal that is representative of a second speed;
• and
• a simulated composite vibration voltage signal that is representative of the second speed and the vibration modulating signal;
• wherein the second waveform generator is synchronized with the first waveform generator;
• and
• generating, by the V/Q converter, a simulated composite vibration charge signal that simulates a speed/vibration composite signal from an accelerometer, wherein the simulated composite vibration charge signal is representative of the simulated composite vibration voltage signal,
• wherein the V/Q converter comprises:
• a transformer, including a primary winding and a secondary winding;
• and
• a capacitor, defining a capacitor input terminal and a capacitor output terminal;
• wherein:
• the transformer is configured to:
• receive the simulated composite vibration voltage signal at the primary winding;
• produce, by inductive coupling, an induced first and second composite vibration voltage signal at the secondary winding;
• and
• apply the induced first and second composite vibration voltage signal to the capacitor input terminal;
• and
• the capacitor is configured to:
• receive, at the capacitor input terminal, the induced first and second composite vibration voltage signal;
• and
• produce, by electrostatic coupling, the simulated composite vibration charge signal at the capacitor output terminal.