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Low Noise Intake System Development for Turbocharged I.C. Engines Using Compact High Frequency Side Branch Resonators

Sabry Allam

Advances in Powertrains and Automotives. 2015, 1(1), 12-23
  • Figure 1. Side branch resonators in a duct. A & B incident, and reflected wave amplitudes, S & L cavity cross sectional area and height, S1 & S2 cross sectional area of upstream and downstream duct, and D & Ln are the neck diameter and length
  • Figure 2. Serial resonator arrangement representation: (a) Quarter wave resonator, (b) Helmholtz resonator, (c) Equivalent circuit, (d) Electric circuit
  • Figure 3. Serial resonator arrangement representation
  • Figure 4. TL versus frequency using an array of resonators in a serial arrangement
  • Figure 5. TL versus frequency using an array of resonators in a parallel arrangement
  • Figure 6. Transmission loss versus frequency for real resonator in serial arrangement
  • Figure 7. Constructer drawing of serial arrangement used in the illustration. L1=0.042, L2=0.059, S1=0.002 m2, S2=0.002 m2, W1=0.0138 m, W2=0.0106 m, pipe diameter 0.05 m
  • Figure 8. Sound transmission loss versus frequency using 2 QWR in serial arrangement during the optimization process. Lx=0.0201 m is the optimum choice
  • Figure 9. The coupling effect between two sub-chambers C1 and C2
  • Figure 10. Transmission loss versus frequency for general arrangement. (a) M=0, (b) M=0.10
  • Figure 11. Sound transmission loss versus frequency using 2 parallel QWR in serial arrangement during the optimization process. Lx=0.0282 m is the optimum choice
  • Figure 12. Measurement set up used during the T- Port Experimental procedure
  • Figure 13. Dimensions of the resonator ( Case 1). Neck Length 0.002 m, Sc1 =10.6e-4 m2, Sc2=19e-4m2,S1=S2=1.9e-3, L1=0.042m, L2=.059m
  • Figure 14. Photo and dimensional details of test object 2
  • Figure 15. Photo and dimensional details of test object 3. (b) Chamber wall thickness 3 mm, chamber main width 17.8, 21.7, 15, 14.4, 14, 15.2,20 mm, inner diameter 34mm
  • Figure 16. Measured and predicted TL at different flow speed.
  • Figure 17. Measured and predicted TL using FEM at different flow speed
  • Figure 18. Effect of parallel arrangement on real resonator acoustic performance
  • Figure 19. Measured and predicted TL using FEM at different flow speed for Case study 2
  • Figure 20. Measured and predicted TL using FEM at different flow speed for Case study 3. The convergence analysis has been checked using finer mesh and higher number of elements and it gave the same TL results
  • Figure A. Comparison of sound pressure spectral densities between OP4 (red line) and OP5(blue line) in inlet side (a) and outlet side (b) [6]