A measuring device for experimental modal analysis of thin-walled workpieces on five-axis milling machines

Kersting, Petra; Biermann, Dirk; Peuker, A.

doi:10.1007/s12289-010-0804-2

Cited by 5 publications

(6 citation statements)

References 5 publications

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“…Experimental methods to obtain desired data for identification are a practical and reliable approach. Such methods are great at applying accurate excitation but implementing them can be challenging, especially during operation [3,19]. Operational approach is to obtain data during operation of the machine under investigation.…”

Section: Introductionmentioning

confidence: 99%

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Position Dependent FRF Identification without Force Measurement in Milling Process

Altun

Çalışkan²,

Özşahin³

2022

Preprint

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Frequency Response Functions (FRF) are one of the most useful methods of representation of machine-tool dynamics under force excitation. FRFs are usually obtained empirically through output measurements and force excitations are controlled by an external device such as hammers or shakers. This study offers an operational identification method which utilizes calculation of force applied during the process as an input for FRF identification. Force excitation is provided through face milling of a thin walled workpiece and acceleration measurements are taken during the process. FRF is calculated at a designated position by sampling workpiece-cutting tool contacts as individual tap tests and substituting a force calculation as input. Force coefficients need to be known for the force calculation. An experimental force coefficient identification method is proposed. In that case, a similar thin walled workpiece at a point with known FRF and acceleration measurements are utilized. Results are confirmed with FRF obtained in the same location for both identification of FRF and identification of force coefficients approaches.

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Section: Introductionmentioning

confidence: 99%

“…Test parameters of FRF Identification (D=63 3. [mm] a p = 2.9 [mm], wall depth=4 [mm])There are several important factors in designing test 4.…”

mentioning

confidence: 99%

Position Dependent FRF Identification without Force Measurement in Milling Process

Altun

Çalışkan²,

Özşahin³

2022

Preprint

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“…The authors also verified the feasibility of the simulation method experimentally. Kersting et al 8 designed a test modal analysis and measurement device for thin-walled parts, in which the dynamic characteristics of the workpiece can be measured effectively by connecting a laser measurement device to the spindle of the machine tool. Ma et al 9 presented a novel design of an inclined feeder with a chute that vibrates like a simple pendulum, and the numerical integration programmes were developed to investigate the kinematic characteristics of the feeder.…”

Section: Introductionmentioning

confidence: 99%

Analysis of vibration from low-rigidity contact in belt grinding of blisk blade

Xiao

Huang

Liu

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part B:

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A blisk is one of the key parts of an aero-engine, whose surface processing quality directly affects aero-engine performance. Different degrees of vibration occur during the process of new open belt grinding which seriously affect the precision of the dimensions and the surface quality of the entire blade profile. With the aim of addressing this problem, this study constructed a physical model of blisk belt grinding, analysed the low-rigidity characteristics of the grinding system, and researched the vibratory mechanism of the blisk belt grinding system based on a dynamic analysis method. In addition, the factors affecting the stability of the grinding process and the stability conditions of the grinding were considered. Then, the belt grinding process of a blade surface was simulated through a numerical method. The technological parameters were quantified for different conditions of the blisk belt grinding vibration. The optimal combination of process parameters was obtained. Finally, the optimised process parameters were validated experimentally. The research demonstrates that vibration from blisk belt grinding is related to the process parameters as follows, in the order of the greatest influence: the grinding pressure, belt velocity, feed speed, and contact wheel hardness. After optimisation, the cross-sectional profile is 0.031–0.041 mm and the surface roughness is 0.1–0.2 μm; the surface is smoother and has better consistency.

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“…The feasibility of the simulation method is verified by experiments. Kersting et al [10] designed a test modal analysis and measurement device for thin-walled parts. By connecting a laser measuring device and a machine tool spindle, the device can effectively measure the dynamic characteristics of the workpiece.…”

Section: Introductionmentioning

confidence: 99%

Study of the Vibration Mechanism and Process Optimization for Abrasive Belt Grinding for a Blisk-Blade

Liu

Xiao

et al. 2019

IEEE Access

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The blisk is a key component of aero engines, and its surface processing quality directly affects the service performance of the aero engine. In using the new open belt grinding process, different degrees of vibration will occur, and they seriously affect the dimensional accuracy and surface quality of the blisk-blade profile. In view of the above-mentioned problems, this paper first built the physical model for the blisk-blade abrasive belt grinding and analyzed the weak stiffness characteristics of the blisk-blade abrasive belt grinding system. Then, based on the kinetic analysis method, the grinding mechanism of the abrasive belt of the blisk-blade was studied, and the process parameters and stability grinding conditions affecting the grinding stability of the blisk-blade belt were analyzed. In addition, the grinding process of the blisk-blade profile belt was simulated by a numerical method. The influence of different process parameters on the grinding vibration of the blisk-blade was quantified, and the optimal combination of process parameters was obtained. Finally, the feasibility of process parameter optimization was verified experimentally. Studies have shown that the weak stiffness of the blisk-blade grinding system always runs through the entire grinding process, but the impact size has a primary and secondary order. The grinding vibration of the blisk-blade belt is related to the process parameters, such as the grinding positive pressure, the belt speed, the feed rate, and the contact wheel hardness. The primary and secondary orders of each influencing factor are grinding positive pressure, belt speed, feed rate, and contact wheel hardness. The optimal combination of various factors was obtained: belt speed v b = 3 m/s, grinding positive pressure F n = 4 N, feed rate v g = 0.6 m/s, and contact wheel hardness Hs/A55. Through the sand belt grinding verification experiment on the blisk-blade, the grinding belt grinding quality of the blisk-blade surface roughness and blade profile precision is improved after the process optimization.

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A measuring device for experimental modal analysis of thin-walled workpieces on five-axis milling machines

Cited by 5 publications

References 5 publications

Position Dependent FRF Identification without Force Measurement in Milling Process

Position Dependent FRF Identification without Force Measurement in Milling Process

Analysis of vibration from low-rigidity contact in belt grinding of blisk blade

Study of the Vibration Mechanism and Process Optimization for Abrasive Belt Grinding for a Blisk-Blade

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