Can elevator noise be detected?

Measurement methods and limits of elevator noise

First,? Conventional standards: At present, there are three main standards related to elevator noise.

1, the quality standard of the elevator itself, mainly including the Technical Conditions for Elevator and the Safety Code for Elevator Manufacture and Installation; It is stipulated that the sound of the main engine room should not be higher than 80 decibels and the sound of the carriage should not be higher than 55 decibels.

2. Building standards, mainly including "Code for Residential Design" and "Code for Sound Insulation Design of Civil Buildings", stipulate that it should not be higher than 50 decibels during the day and 40 decibels at night;

3. Environmental protection standards, mainly including acoustic environmental quality standards. It is stipulated that it should not be higher than 40 decibels during the day and 30 decibels at night.

Second, the regulatory standards:

1, GB22337-2008 Community Noise Emission Standard;

2、GB？ 3096-2008 acoustic environmental quality standard

Three, the elevator noise limit:

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Note: Is the "average noise value in the machine room" of the elevator without machine room away from the traction machine 1 m? Measured average noise value.

Fourth,? Measuring instrument: type 2 comprehensive average sound level meter or automatic environmental noise monitor, measuring? 35dB？ The following noise should be used? 1? When spectrum analysis of noise is needed, the instrument performance shall conform to GB/T324 1? Requirements for filters in. And check it regularly. Use acoustic calibrator for front and back calibration (indicating deviation should not be greater than 0.5? DB) Otherwise the measurement is invalid. The acoustic calibrator shall satisfy 1? Level or? 2? Requirements for sound level calibrator.

Verb (short for verb)? Elevator noise detection index: the noise of the machine room, elevator car, elevator door and key parts in the room when the elevator is running.

Sixth,? Elevator noise source: low-frequency vibration sound caused by operation; Noise pollution such as rubbing sound and airflow generated by operation.

Seven,? Elevator noise sources can be divided into two categories according to their propagation modes.

1. Sound transmission of machine room structure: issued by elevator main engine and machine room control cabinet. The main wall of the main load-bearing beam in the elevator machine room and the main wall in the owner's house are connected by rigid structures, thus forming an "acoustic bridge" for elevator noise transmission. The low-frequency vibration and noise of the elevator during high-speed operation and parking are introduced into the residents through the sound bridge. At present, the most common situation of indoor elevator noise pollution is that the residents on the top floor or the second floor are affected by noise, while other floors are not affected much. By adding a low-frequency damping compound damping device to reduce the vibration transmissibility, the noise can be reduced below the comfortable acoustic environment.

2、? Structural sound transmission in the hoistway: the noise problem caused by the friction between the car and the counterweight main guide rail transmitted to the hoistway structure when the elevator is running. The main track of the elevator is fixed on both sides of the door and connected with the wall. Friction and vibration when sliding on the car guide rail block will form an "acoustic bridge" between the fixed guide rail and the wall and be transmitted to the residents.