ACOUSTIC MOTOR STAND for Research and finishing work on the muting SOUND SYSTEM INTAKE internal combustion engine

摘要

The invention relates to the monitoring equipment, in particular to a test fixture for bench research and finishing work on the evaluation of the effectiveness of noise silencing engine intake system of the internal combustion engine (hereinafter referred to DIC).; Viewed stand contains a pull brake elements shaft mechanical connection with the internal combustion engine shaft load brake kits regulating, measuring and analyzing equipment, an acoustic horn, the research object - the internal combustion engine to the ancillary assembly.; A distinctive feature of the stand is that the acoustic horn is mounted on a separate movable support rack mounted on the carriers sound transmission anechoic chamber floor by bolting through the vibration insulation gasket; thus, the cone aperture angle of the horn is not less than 60 °, bearing shell of the horn is in the form of internal fitting member type continuous perforated metal or polymer sheet, or from a material wire metal mesh, the outer and the inner bearing surface of the shell are lined with a porous absorbing material with the outer protective sound transmission layer; an opening horn conjugation with the air inlet pipe internal combustion engine intake system dense and free from play covers noise-intake pipe internal combustion engine intake system studied by the use of a flexible rubber, foam or porous fiber seal; acoustic horn is able to adjust its position in the space of the chamber along the axis of the crankshaft of the test ICE - horizontal, height and angle - in the vertical plane; free section of the sound inlet of the air cleaner combustion engine intake system is located within the space covered by the acoustic mouthpiece, i.e. in the region of a lower noise background,; generated by extraneous noise sources in the chamber (internal combustion engine with attached units, drive units stand technological systems of ventilation of chamber) and the measuring microphone is installed near the emitting sound, free slice inlet air cleaner combustion engine intake system at a predetermined distance to the free pipe cut according to specific process research procedures.; Practical application of the claimed as a useful model acoustic engine stand for research and finishing work for silencing the internal combustion engine intake system noise be sufficient to reduce the negative impact of spurious background noise processes objective measurements of acoustic noise emission produced by the internal combustion engine intake system, by performing isolation noise emission "extraneous sources of noise" in the measurement point (measurement points), i.e., to increase the dynamic range and the frequency of the objective Measurements of acoustic signals investigated ICE intake system parameters (sound emission gas dynamic component DVS the intake system).