| 摘要 |
FIELD: transport.SUBSTANCE: invention relates to transport engineering. integral noise-killing module is composed by battery of acoustic resonators integrated with standard devices. Said battery consists of acoustic resonators and/or volume expansion chambers. Open necks of the latter are communicated with the underhood space. Said battery features the following overall dimensions: length L, width B and height H. Said dimensions are composed by standard parts, that is, hood, front board and wheels mud flaps, front bumper, engine room bottom shield, i.e. engine mud flap, frame, grate, cooling system fan case and facing. Said parts make the engine room front upper and lower vent openings. Battery of acoustic resonators is composed by quarter-wave acoustic resonators and/or half-wave acoustic resonators and/or Helmholtz resonators and/or expansion chambers. Frequencies of oscillations used by said resonators fequal or differ from those of lower acoustic modes f, f, fof engine room space by not over 1.2 times. Overall dimensions and expansion chamber cavities ratio multiple thereof are not equal and are not multiple of overall dimensions and engine room L:B:H ratio multiple thereof. Mutual radio of expansion chambers sizes and those of said spaces multiple thereof differ by at least 1.2 times.EFFECT: lower noise.21 cl, 35 dwg |
