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Exhaust acoustical impedances simulated from the engine part of the electrical analog circuit infigure 3 (linearized). Figure 16 presents the acoustical impedance of the cold engine simulator, running at 1000 rpm. The reference impedance (0 dB) corresponds to the connected waveguide characteristic impedance Z 0 = 347 k?. The center measurement presents the acoustical impedance of an 747 cm 3 renault engine. In figure 18, the simulated coustical impedance of the engine part in the linearized electrical circuit of figure 3 is presented. The linearization implies: (1) the switches are not operated, i.e. three switches are always open and one is closed; (2) the cylinders capacitors are fixed to the volume with the piston in the middle position. 1. Any exhaust noise from a reciprocating engine can be attenuated by balancing the buffer volume and the engine back pressure. The back pressure can be chosen and then the buffer volume can be determined (or vice versa).Simulated indicator diagram from the circuit presented in figure 3 2. An electrical analog circuit is proposed to simulate the active silencer on a combustion engine. The acoustic impedance and the source spectrum of the modeled engine are similar to these of a real engine. 3. The actuator valve itself is simulated using an electrical analog circuit, wherein the electrical, mechanical and fluid-dynamic properties are modeled in detail. From these results, a prototype actuator valve can be constructed.
Tags : internal combustion engines, acoustic impedance, characteristic impedance, source spectrum, renault engine, actuator valve, combustion engine, analog circuit, exhaust noise, cold engine, valve design, reciprocating engine, dynamic properties, middle position, linearization
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