A method and a monitoring device determine a wear state of components such as a cable-like suspension means, a traction sheave of a drive machine and deflection rollers of a suspension means arrangement of an elevator system. The method comprises at least the following steps: monitoring an actual time curve of a first parameter which correlates with the wear state of at least one first monitored component of the components; comparing the actual time curve of the monitored first parameter with a predetermined expected time curve of the first parameter; and determining the wear state of the monitored component based on a result of the comparison.

The invention relates to a method for defining elongation of an elevator car suspension means. The method comprises: obtaining periodically a value representing an overtravel distance of the elevator car, and defining the elongation of the elevator car suspension means on a basis of the periodically obtained values representing the overtravel distance of the elevator car. The invention relates also to an elevator system performing at least partly the method.

A method and an apparatus monitor the physical state of a suspension means that is connected to an elevator car and can move the same. The support means has markings along its length that divide the support means into segments. The strain difference of the suspension means is monitored segment by segment using a first strain at a first load and a second strain at a second load being determined by a signal processing unit from a distance between two selected markings detected by a detection device, and a strain difference representing the elastic behavior of the segment is calculated from the two strains, wherein the load acting on the suspension means between the two selected markings is measured by a load measuring device.

In an elevator monitoring device, a wear prediction unit calculates a wear amount prediction value through use of a wear prediction expression which uses, as inputs, a tension of a car-side portion and a tension of a counterweight-side portion in each of a plurality of ropes suspending a car and a counterweight, a slippage amount of each of the plurality of ropes, and material hardness of a sheave. The wear amount prediction value is a prediction value of a future wear amount that occurs in a set period in each of a plurality of sheave grooves.

The invention relates to a method for operating an elevator installed in connection with a building, particularly a high rise elevator, in which method the expected rope sway is monitored using building acceleration data obtained by means of a sensor to calculate a building sway, and whereby based on the building sway and the position of an elevator car a rope sway is estimated, which rope sway is compared with a threshold value to determine excessive rope sway and to deduct operation measures for the elevator in order to counteract a determined excessive rope sway. According to the invention a succession of following steps is performed: determining a movement profile for the elevator car by means of an elevator controller predicting the elevator car position based on the movement profile calculating the estimated rope sway based on the predicted car position and the building acceleration data. This leads to an early detection of a possible excessive rope sway happening in the future in course of servicing elevator calls by the allocated elevator car.

A device and a method for detecting elevator rope elongation, and an elevator. An elevator rope is connected to a rope head device and an operating device in an elevator, and the device for detecting elevator rope elongation includes: one and more brackets connected to an elastic reset member in the rope head device, a coupling member connected to at least one of the brackets and configured to be driven into a trigger position by the at least one bracket when the displacement of the elastic reset member exceeds a threshold value due to reduction of compression amount, and a trigger connected to the coupling member and configured to be triggered to generate a trigger signal when the coupling member is driven into the trigger position.

The vibration damping device for an elevator rope includes: an actuator, which is placed in a hoistway, and is configured to generate a forced displacement in response to a drive input and apply a force generated by the forced displacement to an elevator rope; a lateral vibration measuring unit configured to measure a lateral vibration generated in the elevator rope and output the measured lateral vibration as lateral vibration information; a lateral vibration estimation unit configured to estimate a lateral vibration of the elevator rope at a position of the actuator based on the lateral vibration information and output the lateral vibration as an estimated lateral vibration; and an actuator drive unit configured to output the drive input to the actuator to drive the actuator so that the forced displacement has a phase reverse to a phase of the estimated lateral vibration output from the lateral vibration estimation unit.

Embodiments of the present disclosure are directed to a system for monitoring conditions of elevator hoisting members. The system includes a processing device configured to receive an actual resistance data from the one or more pairs of tensile load bearing conductive members, calculate an adjusted resistance data by subtracting the actual resistance data from a baseline resistance data and dividing by the baseline resistance data, input the adjusted resistance data into a process configured to model the adjusted resistance data into a breaking strength value for the elevator hoisting member, receive the breaking strength value, and determine whether the breaking strength value is below a predetermined threshold value for a rated breaking load of the elevator hoisting member, wherein when the breaking strength value is below the predetermined threshold value, output an alert to the elevator controller to instruct the elevator controller to inhibit movement of the elevator hoisting member.

There is provided a building facility vibration measurement device that can easily ascertain whether specs are sufficient for measurement of vibration of a building facility. A building facility vibration measurement device includes: an acceleration detection unit configured to detect acceleration; an acceleration collection unit configured to collect the acceleration detected by the acceleration detection unit; an accuracy calculation unit configured to calculate detection accuracy of the acceleration from information on the acceleration collected by the acceleration collection unit; and a judgement unit configured to, based on the detection accuracy calculated by the accuracy calculation unit, judge whether vibration of a building facility can be measured.