1. Cause: The owner has been troubled by elevator noise since moving into the house involved, which has seriously affected the owner's normal life, work and rest. The property management company once made rectifications to the elevator, but the original situation reappeared after a period of time, so it applied for an appraisal of the noise emission value of the elevator.
2. Process: Our company organized appraisers to conduct preliminary investigations at the owner's home and listened to the statements of the owner and developer. Abnormal noises made when the elevator started and stopped, as well as noise during operation, could be heard on site. When I opened the elevator operating room, I found that the machine beams of the two elevators were directly connected to the cement piers and walls. During the operation of one of the elevators, the rope head wedge sleeves swung greatly, and occasionally hit each other and made abnormal noises.
appraisers selected two time periods from 22:00 to 23:00 at night and from 10:00 to 11:00 during the day to detect the indoor elevator noise in the house. They also measured the vibration value of the machine beam and the noise in the machine room during the operation of the two elevators involved. They compared the measured results with the corresponding national standards for noise and drew conclusions.
3. Conclusion: After discussion and comprehensive technical analysis of the relevant information involved in the case, on-site inspections and test data, the appraiser concluded that the indoor elevator noise in the house involved exceeded the limit requirements of relevant national standards. The sound source mainly came from the electromagnetic vibration during the operation of the elevator motor, the vibration of the brake action, and the mutual collision and abnormal noise of the rope head wedge sleeves.
