Noise Protection

Exercise 1. Maximum sound pressure level 5

Exercise 2. Average level 5

Exercise 3. Noise exposure meter. 5

Exercise 4. Speed of sound and airspeed 5

Exercise 5. *Plane wave. 5

Exercise 6. Maximum and minimum values ​​in the plane wave. 6

Exercise 7. *Sound power in the plane wave. 6

Exercise 8. speed of sound 6

Exercise 9. Complex quantities of sound pressure and velocity. 6

Exercise 10. speed of sound 7

Exercise 11. *Point source in front of a reverberant wall. 7

Exercise 12. Plane wave meets wall 7

Exercise 13. Impedance of a wall. 7

Exercise 14. Degree of absorption of a wall. 7

Exercise 15. Sound insulation of a plywood wall. 7

Exercise 16. Reflection on the water surface. 8

Exercise 17. Reflection on a layer of ice 8

Exercise 18. Degree of absorption of a glass wall. 8th

Exercise 19. Sound transition from air to water 8

Exercise 20. Sound transition air-helium through membrane 9

Exercise 21. Glass wool as a porous absorber. 9

Exercise 22. Delany-Bazeley. 10

Exercise 23. Helmholtz resonator 10

Exercise 24. *Record vibrator. 10

Exercise 25. Sound transmittance of a film. 11

Task 26. Foil absorber. 11

Exercise 27. Absorption silencer with a rectangular cross section 11

Exercise 28. Absorption silencer lined on all sides. 12

Exercise 29. *Reflection silencer. 12

Exercise 30. Chamber silencer. 13

Exercise 31. Branching. 13

Exercise 32. Pipe chamber silencer. 13

Exercise 33. *Silencer 14

Exercise 34. Masonry soundproofing capsule. 14

Exercise 35. Soundproof capsule for machine. 15

Exercise 36. Vibration amplitude 15

Exercise 37. Vibration period of a car body. 15

Exercise 38. Spring constants. 16

Exercise 39. * Vibration isolated mounting of a recording studio. 16

Exercise 40. Level representation of vibration quantities. 16

Exercise 41. *Acoustic parameters of steel plates. 16

Exercise 42. *Vibration of a string. 17

Exercise 43. Monopole and dipole source, sound power comparison 17

Exercise 44. Reverberation radius in the near or far field of the loudspeaker. 17

Exercise 45. Decrease in level vs. doubling distance. 17

Exercise 46. *Sound power and sound pressure level 18

Exercise 47. *Speech intelligibility at a greater distance. 18

Exercise 48. Sound power in conversation. 18

Exercise 49. Source point of a loudspeaker box. 18

Exercise 50. *Loudspeaker as a hemisphere 18

Exercise 51. *Sound reinforcement of a sports field. 19

Exercise 52. In what distance is the value of the sound power equal to that of the sound pressure? 20

Exercise 53. Sound power of a loudspeaker. 20

Exercise 54. Sound power of a loudspeaker. 20

Exercise 55. *Sound power of some sources. 20

Exercise 56. *Measurement of the sound power of an emergency generator. 20

Exercise 57. Open air concert 21

Exercise 58. Measurement of sound power. 21

Exercise 59. Helicopter over reflective ground. 21

Exercise 60. *Sound propagation traffic. 22

Exercise 61. *Noise barrier for industrial noise. 22

Exercise 62. Shielding of a public address system. 23

Exercise 63. Shielding in the workroom.. 23

Exercise 64. Emission level according to RLS 90. 24

Exercise 65. Emission level according to RLS 90. 24

Exercise 66. *Assessment according to TA-Lärm 25