Measurement of ground borne vibrations for foundation design and vibration isolation of a high-precision instrument

Özkan, M. Yener
This study focuses on the foundation design and vibration isolation of a high-precision instrument subjected to ground-borne vibrations. The allowable vibration level for the proper operation of the sensitive equipment was 50 mu g in a frequency range of 1-300 Hz. Prior to foundation design, first, an extensive field survey including geological and geophysical tests were performed in situ to obtain the static and dynamic physical properties of the soils. Next, vibration levels at various locations in the vicinity of moving vibration sources at the site were measured by accelerometers in one third octave frequency range from 1 Hz to 1000 Hz. Background vibration levels at the site were also measured while all of the vibration sources were inactive. Based on the measurements, a special foundation system was designed to reduce the vibration levels at the base of the precision instrument to allowable vibration limits while the vibration sources were active. Consequently, measurements were performed on the actual true scale foundation structure constructed at the site to assess the vibration isolation performance of specially designed structure. The actual vibration levels on top of the inertia mass show good agreement with the predicted values.


Vibration isolation of inertial measurement unit
Çınarel, Dilara; Ciğeroğlu, Ender; Department of Mechanical Engineering (2012)
Sensitive devices are affected by extreme vibration excitations during operation so require isolation from high levels of vibration excitations. When these excitation characteristics of the devices are well known, the vibration isolation can be achieved accurately. However, it is possible to have expected profile information of the excitations with respect to frequency. Therefore, it is practical and useful to implement this information in the design process for vibration isolation. In this thesis, passive ...
Experimental characterization of a tuned vibration absorber
Aksoy, Tuğrul; Özgen, Gökhan Osman; Acar, Bülent; Gençoğlu, Caner (2016-01-01)
In this paper, experimental characterization studies conducted for a tuned vibration absorber is presented. The tuned vibration absorber has been particularly designed to reduce transverse resonant vibration response of a supported cylinder structure at its dominant two modes. Various testing configurations and techniques have been used such as transmissibility measurements, frequency response measurements, sweep sine testing, impact testing, and random testing. Different testing approaches were needed to e...
Response of acoustic imaging systems using convergent leaky waves to cylindrical flaws
Günalp, Nilgün; Atalar, Abdullah (Institute of Electrical and Electronics Engineers (IEEE), 1989-9)
A theoretical study of imaging systems utilizing focused leaky surface acoustic waves (SAWs), and their response to certain kind of defects is presented. In particular, circular cylindrical inhomogeneities with axes perpendicular to the surface are considered. The scattering of the SAW from this cylinder is formulated with some approximations. The surface wave incident on the inhomogeneity is initially found as an angular spectrum of plane waves. However, to apply the boundary conditions at the cylindrical ...
Design, modelling and analysis of a novel implantable bone conduction hearing aid with a piezoelectric actuator
Koyuncu, Anıl; Özgüven, Hasan Nevzat; Şahin, Melin; Department of Mechanical Engineering (2022-9-01)
This thesis study proposes a novel bone conduction (BC) transducer design, which intends to overcome the drawbacks of conventional bone conduction hearing aids (BCHAs). A piezoelectric actuator design with a rhombus-type mechanical amplifier is chosen as a BC transducer in the first step, and a commercial amplified piezoelectric actuator (APA) is selected for trials. The dynamics of the mechanical amplifier and embedded stacked piezoelectric actuator are formulated separately based on linear analytical appr...
Investigation of Stockbridge dampers for vibration control of overhead transmission lines
Kasap, Hüseyin; Özgen, Gökhan Osman; Department of Mechanical Engineering (2012)
This thesis aims to examine the performance of Stockbridge dampers used to suppress aeolian vibrations on overhead transmission lines arising from the wind. In this respect, a computer program, based on the Energy Balance Method, is developed using MATLAB. The developed computer program has also a graphical user interface (GUI), which allows the program to interactively simulate Stockbridge damper performance for vibration control of overhead transmission lines. Field tests results obtained from literature ...
Citation Formats
D. ÜLGEN, Ö. L. ERTUĞRUL, and M. Y. Özkan, “Measurement of ground borne vibrations for foundation design and vibration isolation of a high-precision instrument,” MEASUREMENT, pp. 385–396, 2016, Accessed: 00, 2020. [Online]. Available: