Dynamic Modal Analysis of Vertical Machining Centre Components

Patwari, Muhammed Anayet Ullah; Faris, Waleed Fekry; Amin, A. K. M. Nurul; Loh, S. K.

doi:10.1155/2009/508076

Cited by 21 publications

(9 citation statements)

References 5 publications

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“…The ACK supports rigid body simulations and simple elastic body simulations [4]. Anayet et al (2009) presented a consecutive procedure in experimental and analytical modal analysis applied in structural dynamic evaluation processes of a vertical machining centre [5]. Dhupia et al (2006) presented kinematic and dynamic abilities of the machine, including the experimental frequency response functions (FRFs) and computed stability lobes of the machine in different configurations [6].…”

Section: Introductionmentioning

confidence: 79%

Rigid body dynamics in optimization of the machine tool vibroisolation

Slavković¹,

Veg

Dučić³

et al. 2015

Teh. vjesn.

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Original scientific paper Modern design of the machine tool treats the suspending parts as a crucial element of the effective vibration isolation. Therefore the suspending items are specifically developed and subjected to extensive tests before being applied on real objects. These elements ensure accurate levelling and appropriate vibration damping. Usually selection of inadequate support element causes intensive disturbing effects in machining. The paper presents dynamics analysis of the machine tool suspended on flexible mountings. The overall analysis is conceived on a rigid body dynamics. This method enables selection of an optimal supporting configuration. Further on such an effective suspension design prevents a need for expensive monitoring of the dynamic characteristics of the mechanical system, i.e. machine tool and supports. The paper explores dynamics of a real, flexibly supported machine tool. Results are obtained with the assistance of the "SUPPORT" software. Finally the theoretical and computational statements are approved throughout extensive site measurements on the machine tool body with appropriate instrumentation. Keywords: dynamics analysis; experiment; machine tool; software; transfer function Dinamika sustava krutih tijela u optimizaciji vibroizolacije alatnih strojevaIzvorni znanstveni članak Suvremeni razvoj alatnih strojeva tretira oslonce kao presudne elemente u vibroizolaciji. Zbog toga su oslonci posebno razvijeni i podvrgnuti opsežnim testovima prije primjene na realnim objektima. Oni osiguravaju precizno niveliranje i amortizaciju vibracija. Neodgovarajući izbor oslonaca uzrokuje neželjene efekte u procesu obrade. Rad prezentira analizu dinamike alatnog stroja oslonjenog na fleksibilne oslonce. Ukupna analiza je koncipirana na dinamici krutih tijela. Ova metoda omogućava izbor optimalne konfiguracije oslanjanja. Ovako efikasan razvoj oslanjanja eliminira potrebu za skupim nadzorom strojnog sustava, tj. alatnog stroja i oslonca. U radu je dana analiza dinamike fleksibilno oslonjenog alatnog stroja u realnim uvjetima. Rezultati su dobiveni pomoću softvera SUPPORT. Konačno, teorijski i računarki rezultati potvrđeni su opsežnim mjerenjima na alatnom stroju, odgovarajućom mjernom opremom.

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Section: Introductionmentioning

confidence: 79%

Rigid body dynamics in optimization of the machine tool vibroisolation

Slavković¹,

Veg

Dučić³

et al. 2015

Teh. vjesn.

View full text Add to dashboard Cite

show abstract

“…To better understand and refine the inherent dynamic properties of structures, modal analysis is an essential tool for this purpose. Experimental modal analysis involves assessing modal parameters through physical testing, not like analytical modal analysis, which obtains these parameters from finite element models (FEMs) [25][26][27]. It is critical to achieve time invariance and reciprocity in modal testing.…”

Section: Correlating Fem Frequency and Vibration Modes With Modal Tes...mentioning

confidence: 99%

Integrating numerical techniques and predictive diagnosis for precision enhancement in roller cam rotary table

Chan,

Wu,

Ullah

et al. 2024

Int J Adv Manuf Technol

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Currently, various industries are increasingly trending towards multi-axis machining and Industry 4.0. As a result, the demand for machining flexibility, speed, and precision in machine tools is also rising. Different manufacturers provide many components of machine tools, and the alignment precision, main structure, component rigidity, and dynamic performance of these components all impact the machining precision of multi-axis machine tools.Therefore, the structural design of each component is crucial. In this study, a roller cam rotary table is selected for analysis using the Finite Element Method, considering the constraints of the machine environment. The investigation includes Vibration mode shape, gravitational load, External loading, transient, spectral, and topology optimization inspection. The static analysis reveals weak points in the machine's structure. Modal analysis helps understand the natural frequencies that affect the machine's structure, resulting in mitigation of resonance during the machining process and enhancing machining precision. Finally, the modal impact test is conducted using accelerometers and an impact hammer whereas ME'scope curve fitting is employed to determine the mode shapes and natural frequencies. The results are compared to validate the accuracy of the analysis, with a deviation of 8.5%, 8.3%, and 1.4%. Topological optimization analysis is performed on machine components, aiming to reduce weight and improve natural frequencies as compared to the original design. Precision tests such as repeatability and segmentation accuracy are essential for rotary tables. These tests provide information about the errors at different angles, ensuring accuracy, reliability, and quality during the machining process. In this study, vibration signals from the rotary table are captured using a smart predictive diagnosis performance system (PDPS). An algorithm is used to analyze the normal vibration signals and establish a healthy model for continuous monitoring of the rotary table's health status. Principal Component Analysis (PCA) is applied to identify fault features and diagnose mechanical problems. This enables early detection of anomalies in the rotary table, reducing downtime and maintenance costs due to damage and improving the machine's efficiency.

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“…Several researchers have done modal analysis through experimental and FEM both to predict the dynamic behavior of engineering components. Patwari et al [2] presented a systematic process and details of the use of experimental testing and finite element modeling technique to determine dynamic characteristics of milling machine vertical machining centre. The FEM software ABAQUS was used to extract the natural frequency and shape of vibration modes.…”

Section: Introductionmentioning

confidence: 99%

Experimental modal analysis using laser vibrometer and finite element modeling of milling machine arbor

Sharma

Parashar

2019

SN Appl. Sci.

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Experimental modal analysis has received a lot of consideration in recent days for dynamic analysis of complicated engineering structure and machine tools. It is a process which is used to determine the inherent dynamic properties of structure such as damping, mode shapes and natural frequencies. The experimental modal analysis benefits in design of all types of structures including automotive components, aircraft components, spacecraft, computers and tennis rackets and golf clubs etc. The present study deals with the experimental investigation of free vibration of milling machine arbor. Experimental modal analysis of milling machine arbor is carried out by using laser vibrometer for measurement and impact hammer for excitation. The experimental results are compared with the numerical predictions obtained using finite element modeling software ANSYS workbench 14.5. The scope of present work is to understand and investigate the modal parameters of milling machine arbor in the form of natural frequency and mode shape for robust design.

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Dynamic Modal Analysis of Vertical Machining Centre Components

Cited by 21 publications

References 5 publications

Rigid body dynamics in optimization of the machine tool vibroisolation

Rigid body dynamics in optimization of the machine tool vibroisolation

Integrating numerical techniques and predictive diagnosis for precision enhancement in roller cam rotary table

Experimental modal analysis using laser vibrometer and finite element modeling of milling machine arbor

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