000130192 001__ 130192
000130192 005__ 20241125101140.0
000130192 0247_ $$2doi$$a10.1109/TIM.2023.3246530
000130192 0248_ $$2sideral$$a134400
000130192 037__ $$aART-2023-134400
000130192 041__ $$aeng
000130192 100__ $$aArranz, Fernando
000130192 245__ $$aOn identifying natural frequencies in the JAST80 telescope and validation with a simplified 3-d Model
000130192 260__ $$c2023
000130192 5060_ $$aAccess copy available to the general public$$fUnrestricted
000130192 5203_ $$aThe instrumentation of professional telescopes is very sensitive to vibrations. These vibrations, caused by wind, terrain, or its actuators, affect the quality of the images taken. If vibrations present frequency components coinciding with the natural frequencies associated with the proper modes of the telescope mount, the vibratory response is amplified and cause a decrease in image quality below the required standards. The goal of our study is to identify the natural frequencies of the German equatorial mount of the JAST80 telescope of the Observatorio Astrofísico de Javalambre (OAJ) and to validate a simplified finite element model (FEM). In addition, the interaction of the vibrations produced by the actuators in a right ascension (RA) movement with the natural frequencies obtained by means of a finite element analysis (FEA) is analyzed. To excite the structure of the telescope, its response in free vibration after an unexpected emergency stop of an RA movement was used. A setup of three accelerometers allowed us to compare the excitation frequencies of the structure with those obtained with the FEA. Natural frequency values obtained through the FEM showed deviations below 12% with respect to the experimental values, thus validating the simplified 3-D numerical model of the telescope mount for further analysis of its dynamic behavior. On the other hand, the analysis of the measured vibratory indicated that the natural frequencies of the mount for an RA movement in normal operation were not excited by the actions produced by the actuator, and therefore, the quality of the images taken is not compromised. Finally, the possibility of using the measurement of the vibrational response of the mount in emergency stop conditions to monitor its structural integrity is pointed out.
000130192 536__ $$9info:eu-repo/grantAgreement/ES/UZ/Cátedra Devoture de Tecnología para el Ser Humano
000130192 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000130192 590__ $$a5.6$$b2023
000130192 592__ $$a1.536$$b2023
000130192 591__ $$aINSTRUMENTS & INSTRUMENTATION$$b9 / 76 = 0.118$$c2023$$dQ1$$eT1
000130192 593__ $$aInstrumentation$$c2023$$dQ1
000130192 591__ $$aENGINEERING, ELECTRICAL & ELECTRONIC$$b53 / 353 = 0.15$$c2023$$dQ1$$eT1
000130192 593__ $$aElectrical and Electronic Engineering$$c2023$$dQ1
000130192 594__ $$a9.0$$b2023
000130192 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000130192 700__ $$0(orcid)0000-0002-8411-1247$$aAbad, Javier$$uUniversidad de Zaragoza
000130192 700__ $$0(orcid)0000-0002-9508-7078$$aRamos, Pedro$$uUniversidad de Zaragoza
000130192 700__ $$aBielsa, Samuel
000130192 700__ $$aYanes-Díaz, Axel
000130192 700__ $$0(orcid)0000-0002-9408-1280$$aPalacios-Navarro, Guillermo$$uUniversidad de Zaragoza
000130192 7102_ $$15008$$2785$$aUniversidad de Zaragoza$$bDpto. Ingeniería Electrón.Com.$$cÁrea Tecnología Electrónica
000130192 7102_ $$15004$$2545$$aUniversidad de Zaragoza$$bDpto. Ingeniería Mecánica$$cÁrea Ingeniería Mecánica
000130192 7102_ $$15008$$2800$$aUniversidad de Zaragoza$$bDpto. Ingeniería Electrón.Com.$$cÁrea Teoría Señal y Comunicac.
000130192 773__ $$g72 (2023), 6501213 [13 pp.]$$pIEEE trans. instrum. meas.$$tIEEE Transactions on Instrumentation and Measurement$$x0018-9456
000130192 8564_ $$s1645915$$uhttps://zaguan.unizar.es/record/130192/files/texto_completo.pdf$$yPostprint$$zinfo:eu-repo/date/embargoEnd/2025-02-20
000130192 8564_ $$s3330760$$uhttps://zaguan.unizar.es/record/130192/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint$$zinfo:eu-repo/date/embargoEnd/2025-02-20
000130192 909CO $$ooai:zaguan.unizar.es:130192$$particulos$$pdriver
000130192 951__ $$a2024-11-22-12:02:24
000130192 980__ $$aARTICLE