In-Car Noise Computation for a High-Rise Lift

Gabriela Roivainen, Jaakko Kalliomäki, Antti Lehtinen, Jukka Tanttari

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

The authors have developed an acoustic model of a lift, using a multi-disciplinary approach. The model enables a full understanding of how the lift design is affected by noise requirements inside the car, and in buildings that are still in planning or construction phase. The approach is based on a hybrid model combining structural finite element (FEM); computational fluid dynamics (CFD); boundary element method (BEM) and statistical energy analysis (SEA); to cover both low and relatively high frequency acoustical domains in a sufficiently detailed model with a reasonable computational time. Special attention has been paid to modelling of the noise sources. Structure-borne sources (point forces) due to roller guide shoes and ropes were applied on the system. Forces were determined on grounds of FEM-computed point mobilities and measured vibration velocity responses at the same excitation points. Airborne sources due to flow-induced noise were computed using an incompressible transient CFD analysis. The resulting time variable air surface pressure was then applied on the car walls. The surface pressure spectra were used both directly (the convective source) and as a source for the acoustic propagation (giving the acoustic source). The reverberant sound field in the hoistway, generated by the flow sources, is a significant contributor. This part was modelled using BEM. The time variable pressure field on the car surface was used as a source distribution for BEM. The end result of the computation was applied as a diffuse acoustic field on the car surfaces. All the sources: structure-borne and airborne, were applied as forces and pressures. They were internally converted to power inputs for solving the SEA model. All transfer paths in the sling, car, doors, fairings and hoistway, including relevant leaks were simulated. After validation, the hybrid model now allows the users to quantify and rank noise contribution of each source and make predictions based on changes in the lift structure, hoistway design and car running parameters.
Original languageEnglish
Title of host publicationProceedings of the 7th Symposium on Lift & Escalator Technologies
Number of pages10
Publication statusPublished - 2017
MoE publication typeA4 Article in a conference publication
Event7th Symposium on Lift and Escalator Technologies - Northampton, United Kingdom
Duration: 20 Sep 201721 Sep 2017

Conference

Conference7th Symposium on Lift and Escalator Technologies
CountryUnited Kingdom
CityNorthampton
Period20/09/1721/09/17

Fingerprint

boundary element method
computational fluid dynamics
acoustics
fairings
shoes
acoustic propagation
rollers
sound fields
pressure distribution
point sources
planning
vibration
requirements
energy
air
predictions
excitation

Keywords

  • aero-vibro-acoustics
  • lifts
  • high speed
  • high rise
  • FEM
  • BEM
  • CFD
  • SEA

Cite this

Roivainen, G., Kalliomäki, J., Lehtinen, A., & Tanttari, J. (2017). In-Car Noise Computation for a High-Rise Lift. In Proceedings of the 7th Symposium on Lift & Escalator Technologies [21]
Roivainen, Gabriela ; Kalliomäki, Jaakko ; Lehtinen, Antti ; Tanttari, Jukka. / In-Car Noise Computation for a High-Rise Lift. Proceedings of the 7th Symposium on Lift & Escalator Technologies. 2017.
@inproceedings{d1412937ef424d9283a5e8d479dd601c,
title = "In-Car Noise Computation for a High-Rise Lift",
abstract = "The authors have developed an acoustic model of a lift, using a multi-disciplinary approach. The model enables a full understanding of how the lift design is affected by noise requirements inside the car, and in buildings that are still in planning or construction phase. The approach is based on a hybrid model combining structural finite element (FEM); computational fluid dynamics (CFD); boundary element method (BEM) and statistical energy analysis (SEA); to cover both low and relatively high frequency acoustical domains in a sufficiently detailed model with a reasonable computational time. Special attention has been paid to modelling of the noise sources. Structure-borne sources (point forces) due to roller guide shoes and ropes were applied on the system. Forces were determined on grounds of FEM-computed point mobilities and measured vibration velocity responses at the same excitation points. Airborne sources due to flow-induced noise were computed using an incompressible transient CFD analysis. The resulting time variable air surface pressure was then applied on the car walls. The surface pressure spectra were used both directly (the convective source) and as a source for the acoustic propagation (giving the acoustic source). The reverberant sound field in the hoistway, generated by the flow sources, is a significant contributor. This part was modelled using BEM. The time variable pressure field on the car surface was used as a source distribution for BEM. The end result of the computation was applied as a diffuse acoustic field on the car surfaces. All the sources: structure-borne and airborne, were applied as forces and pressures. They were internally converted to power inputs for solving the SEA model. All transfer paths in the sling, car, doors, fairings and hoistway, including relevant leaks were simulated. After validation, the hybrid model now allows the users to quantify and rank noise contribution of each source and make predictions based on changes in the lift structure, hoistway design and car running parameters.",
keywords = "aero-vibro-acoustics, lifts, high speed, high rise, FEM, BEM, CFD, SEA",
author = "Gabriela Roivainen and Jaakko Kalliom{\"a}ki and Antti Lehtinen and Jukka Tanttari",
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Roivainen, G, Kalliomäki, J, Lehtinen, A & Tanttari, J 2017, In-Car Noise Computation for a High-Rise Lift. in Proceedings of the 7th Symposium on Lift & Escalator Technologies., 21, 7th Symposium on Lift and Escalator Technologies, Northampton, United Kingdom, 20/09/17.

In-Car Noise Computation for a High-Rise Lift. / Roivainen, Gabriela; Kalliomäki, Jaakko; Lehtinen, Antti; Tanttari, Jukka.

Proceedings of the 7th Symposium on Lift & Escalator Technologies. 2017. 21.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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T1 - In-Car Noise Computation for a High-Rise Lift

AU - Roivainen, Gabriela

AU - Kalliomäki, Jaakko

AU - Lehtinen, Antti

AU - Tanttari, Jukka

N1 - Project code: 108187

PY - 2017

Y1 - 2017

N2 - The authors have developed an acoustic model of a lift, using a multi-disciplinary approach. The model enables a full understanding of how the lift design is affected by noise requirements inside the car, and in buildings that are still in planning or construction phase. The approach is based on a hybrid model combining structural finite element (FEM); computational fluid dynamics (CFD); boundary element method (BEM) and statistical energy analysis (SEA); to cover both low and relatively high frequency acoustical domains in a sufficiently detailed model with a reasonable computational time. Special attention has been paid to modelling of the noise sources. Structure-borne sources (point forces) due to roller guide shoes and ropes were applied on the system. Forces were determined on grounds of FEM-computed point mobilities and measured vibration velocity responses at the same excitation points. Airborne sources due to flow-induced noise were computed using an incompressible transient CFD analysis. The resulting time variable air surface pressure was then applied on the car walls. The surface pressure spectra were used both directly (the convective source) and as a source for the acoustic propagation (giving the acoustic source). The reverberant sound field in the hoistway, generated by the flow sources, is a significant contributor. This part was modelled using BEM. The time variable pressure field on the car surface was used as a source distribution for BEM. The end result of the computation was applied as a diffuse acoustic field on the car surfaces. All the sources: structure-borne and airborne, were applied as forces and pressures. They were internally converted to power inputs for solving the SEA model. All transfer paths in the sling, car, doors, fairings and hoistway, including relevant leaks were simulated. After validation, the hybrid model now allows the users to quantify and rank noise contribution of each source and make predictions based on changes in the lift structure, hoistway design and car running parameters.

AB - The authors have developed an acoustic model of a lift, using a multi-disciplinary approach. The model enables a full understanding of how the lift design is affected by noise requirements inside the car, and in buildings that are still in planning or construction phase. The approach is based on a hybrid model combining structural finite element (FEM); computational fluid dynamics (CFD); boundary element method (BEM) and statistical energy analysis (SEA); to cover both low and relatively high frequency acoustical domains in a sufficiently detailed model with a reasonable computational time. Special attention has been paid to modelling of the noise sources. Structure-borne sources (point forces) due to roller guide shoes and ropes were applied on the system. Forces were determined on grounds of FEM-computed point mobilities and measured vibration velocity responses at the same excitation points. Airborne sources due to flow-induced noise were computed using an incompressible transient CFD analysis. The resulting time variable air surface pressure was then applied on the car walls. The surface pressure spectra were used both directly (the convective source) and as a source for the acoustic propagation (giving the acoustic source). The reverberant sound field in the hoistway, generated by the flow sources, is a significant contributor. This part was modelled using BEM. The time variable pressure field on the car surface was used as a source distribution for BEM. The end result of the computation was applied as a diffuse acoustic field on the car surfaces. All the sources: structure-borne and airborne, were applied as forces and pressures. They were internally converted to power inputs for solving the SEA model. All transfer paths in the sling, car, doors, fairings and hoistway, including relevant leaks were simulated. After validation, the hybrid model now allows the users to quantify and rank noise contribution of each source and make predictions based on changes in the lift structure, hoistway design and car running parameters.

KW - aero-vibro-acoustics

KW - lifts

KW - high speed

KW - high rise

KW - FEM

KW - BEM

KW - CFD

KW - SEA

M3 - Conference article in proceedings

BT - Proceedings of the 7th Symposium on Lift & Escalator Technologies

ER -

Roivainen G, Kalliomäki J, Lehtinen A, Tanttari J. In-Car Noise Computation for a High-Rise Lift. In Proceedings of the 7th Symposium on Lift & Escalator Technologies. 2017. 21