Structural Statics And Dynamics
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WEPB08 Multibody Simulations with Reduced Order Flexible Bodies Obtained by FEA 286
  • P. Brumund, T. Dehaeze
    ESRF, Grenoble, France
  • T. Dehaeze
    PML, Liège, Belgium
  Tighter specifications in synchrotron instrumentation development force the design engineers more and more often to choose a mechatronics design approach. This includes actively controlled systems that need to be properly designed. The new Nano Active Stabilization System (NASS) for the ESRF beamline ID31 was designed with such an approach. We chose a multi-body design modelling approach for the development of the NASS end-station. Significance of such models depend strongly on its input and consideration of the right stiffness of the system’s components and subsystems. For that matter, we considered sub-components in the multi-body model as reduced order flexible bodies representing the component’s modal behaviour with reduced mass and stiffness matrices obtained from finite element analysis (FEA) models. These matrices were created from FEA models via modal reduction techniques, more specifically the component mode synthesis (CMS). This makes this design approach a combined multibody-FEA technique. We validated the technique with a test bench that confirmed the good modelling capabilities using reduced order flexible body models obtained from FEA for an amplified piezoelectric actuator (APA).  
poster icon Poster WEPB08 [1.486 MB]  
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About • paper received ※ 16 July 2021       paper accepted ※ 27 September 2021       issue date ※ 31 October 2021  
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An FEA Investigation of the Vibration Response of the BEATS Detector Stage  
  • T.F. Mokoena, A. Kaprolat, P. Van Vaerenbergh
    ESRF, Grenoble, France
  • M. Bhamjee, S.H. Connell
    University of Johannesburg, Johannesburg, South Africa
  • G. Iori
    SESAME, Allan, Jordan
  As for all Synchrotron Radiation based installations, floor vibrations lead to unreliable results if transmitted to sensible equipment like sample environment and detection systems. It is important to design the optical and experimental equipment of a beamline in a way to minimize the effect of the vibrations. This project investigates the design of the detector stage in SESAME’s tomography beamline BEATS by using random vibration analysis to determine the rigidity of the structure. The design analysis of the detector stage takes the approach of using an existing installation at beamline ID28 of the European Synchrotron Radiation Facility by measuring the power spectrum density of the floor on which the structure is mounted on as well as the response of the structure stage as it is subjected to an excitation from ambient floor noise. A finite element analysis numerical model was established and validated against the experimental data. Once the model is validated within acceptable range, the technique will be applied to the BEATS detector stage design by applying the floor power spectrum density of the SESAME synchrotron and calculating the response of the structure. It is assumed that the random vibration process in this case follows a Gaussian normal distribution. The response power spectrum density Root Mean Square value at the location of interest should be at least 6 times less than the pixel size of the camera that will be used in detector. For the ID28 case, the model was validated by comparing the natural frequency measured and the experimental output RMS value against the model output RMS value. The model natural frequencies deviated from the experimental results by 4.53% and the model RMS values deviated from the experimental results by 1.91%.  
poster icon Poster WEPB09 [0.846 MB]  
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THOB03 Innovative and Biologically Inspired Petra IV Girder Design 360
  • S. Andresen
    Alfred-Wegener-Institut, Bremerhaven, Germany
  • N. Meyners, D. Thoden
    DESY, Hamburg, Germany
  Funding: Deutsches Elektronen Synchrotron (DESY), a research centre of the Helmholtz Association - Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research
DESY (Deutsches Elektronen Synchrotron) is currently expanding the PETRA III storage ring X-ray radiation source to a high-resolution 3D X-ray microscope providing all length scales from the atom to millimeters. This PETRA IV project involves an optimization of the girder magnet assemblies to reduce the impact of ambient vibrations on the particle beam. For this purpose, an innovative and biologically inspired girder structure has been developed. Beforehand, a large parametric study analyzed the impact of different loading and boundary conditions on the eigenfrequencies of a magnet-girder assembly. Subsequently, the girder design process was generated, which combined topology optimizations with biologically inspired structures (e.g., complex Voronoi combs, hierarchical structures, and smooth connections) and cross section optimizations using genetic algorithms to obtain a girder magnet assembly with high eigenfrequencies, a high stiffness, and reduced weight. The girder was successfully manufactured from gray cast iron and first vibration experiments have been conducted to validate the simulations.
slides icon Slides THOB03 [4.169 MB]  
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About • paper received ※ 28 July 2021       paper accepted ※ 28 September 2021       issue date ※ 08 November 2021  
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