Research and Improvement of the High-speed Elevator Over-speed Governor

Hui, Linhu; Wang, Yi

doi:10.12783/dtetr/iceta2016/7096

Cited by 2 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The rectangular coordinate system is transformed into the polar coordinate system. For point A, the polar angle θ A can be obtained by equation (8). Additionally, the direction of the linear velocity at point A is perpendicular to its radius.…”

Section: Measurement Uncertaintymentioning

confidence: 99%

“…Once the elevator reaches the pre-set speed (that is, electrical and mechanical tripping speed), the electrical switch or mechanical switch will be triggered to block sheaves and governor rope. 7,8 Then, the blocked governor rope triggers the safety gear through the sliding capture assembly to brake the elevator. The response time of triggering should be less than 0.5 seconds.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An image recognition measurement approach and uncertainty for overspeed governors employed in elevator safety

Zhang

Zhao

Yan

et al. 2023

Building Services Engineering Research and Technology

View full text Add to dashboard Cite

Elevator safety is closely related to public safety. Overspeed governor is a crucial part of the elevator safety system. Its inspection and calibration involve the measurement of tripping velocity. The frequently-used contact-type measurement method has risks. This paper proposes a non-contact image-recognizing measurement method by the camera, which includes the processes of rotor centre recognition, feature points matching, and tripping switches recognition. The velocity curve can be obtained by feature points displacement based on the rotor centre. Tripping switches recognition can determine the electrical and mechanical tripping velocities in the speed curve. The experimental results demonstrate that the proposed method has no significant difference from the common contact-type measurement method, while it significantly eliminates the risks of physical damage and improves measurement safety. Moreover, this paper proposes the deduction and calculation of measurement uncertainty decided by camera performance. Due to the enhancement of measuring safety, the proposed method will have further application in the field of elevator inspection. Practical application: The research on tripping velocity measurement for overspeed governor in this paper is principally based on image recognition with the help of a camera. The experiment result indicates that the proposed method is capable of completing the speed measurement for the overspeed governor without contact. The proposed method significantly mitigates the risks of physical damage and improves measurement safety rather than the contact-type measurement method. The proposed non-contact image-recognizing method can substitute for the existing contact-type method and contributes to the inspection, maintenance, and management of elevators, which will have further application prospects.

show abstract

Section: Measurement Uncertaintymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An image recognition measurement approach and uncertainty for overspeed governors employed in elevator safety

Zhang

Zhao

Yan

et al. 2023

Building Services Engineering Research and Technology

View full text Add to dashboard Cite

show abstract

Novel Elevator Overspeed Governor Design and Multibody Dynamic Analysis

Cenitagoya

Remirez

Cabello

et al. 2022

Journal of Testing and Evaluation

View full text Add to dashboard Cite

Overspeed governors are the crucial safety elements that have allowed the popularization of elevators for the last two centuries, being their main function to securely activate the safety breaks of the cab in an overspeed situation such as a failure in the machine or a rope break. The design of these elements has barely changed in the industry and still relays on a cam follower design that stops rotating when centrifugal forces reach a critical point. Such a design of multiple parts with relative motion induces wear, produces noise, and can even lead to availability reduction. In this paper, the design process and the multibody dynamic (MBD) analysis of a novel overspeed governor concept are presented, with the objective to reduce moving parts and improve the performance and robustness of the solution. A group of partitioners and experienced designers along with industrial partners have analyzed new creative designs, and a new governor typology is presented. Owing to the standard required sensitivity of the governor, a deep MBD analysis is performed to precisely define optimal design parameters. The proposed design has fewer moving parts and therefore is more resilient, reducing the possibilities of failure and the maintenance needs and therefore being a more cost-efficient solution. Optimization techniques have been implemented to fit design parameters and evaluate robustness. Additionally, the effect of manufacturing- or wear-induced clearances is analyzed for the traditional and the novel governor concepts, proving that the new concept is safer in the long term. The adopted design and analysis methodology can also be used for the improvement or definition of new overspeed governors.

show abstract

Research and Improvement of the High-speed Elevator Over-speed Governor

Cited by 2 publications

References 1 publication

An image recognition measurement approach and uncertainty for overspeed governors employed in elevator safety

An image recognition measurement approach and uncertainty for overspeed governors employed in elevator safety

Novel Elevator Overspeed Governor Design and Multibody Dynamic Analysis

Contact Info

Product

Resources

About