Simulation (SIM)

• Determines maximal output
• Calculates voice coil, gap and magnet temperature
• Separates the effects of the individual nonlinearities
• Reveals dominant sources of distortion
• Shows mechanical and thermal load
• Helps to improve performance/cost ratio
• Saves time and cost in prototyping

This module performs a numerical prediction of the small and large signal performance of electro-dynamical transducers and complete systems using vented, sealed-box, band-pass enclosures and passive radiators. An extended model considers dominant nonlinearities of the driver (motor and suspension), the acoustical system (air compression, port losses, passive radiator suspension, Doppler effect), power dissipation and heat transfer using linear, nonlinear and thermal parameters of a real driver measured by the LSI module or fictitious parameters of a design choice. For a two-tone excitation signal, all electrical, mechanical and acoustical variables are calculated. The fundamental and distortion components (harmonics, intermodulation, dc component) are calculated by a spectral analysis. The SIM is a twin module of the DIS module to simplify the comparison of measured and predicted responses. Each nonlinearity in the system can be switched on and off to investigate its effect systematically. This reveals the dominant sources of distortion and gives valuable indications for driver optimization.

This figure illustrates the transformation of the target performance (permissible THD) into a transducer parameter (nonlinear shape of the nonlinear compliance C_ms(x)) which is the basis for selecting the optimal driver for the system design. A nonlinear curve editor simplifies the generation of design choices.