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Extracting Single Source Geometric Error Value from a Double Ballbar Measurement Error Map
Saragih, Agung Shamsuddin,Ko, Tae Jo Trans Tech Publications, Ltd. 2013 Applied Mechanics and Materials Vol. No.
<P>The double ballbar (DBB) test is a well-known way to check the geometric error of axis interaction. The DBB test captures actual data from multiple error origins. Here, we define the DBB measurement result as the sinusoid error map model plus noise. Using this concept, we extract a single source geometric error value from the DBB error map by LS fitting. We considered the “noise” as mix error from other sources. To ensure the quality of a numerical fitting, we used a sinusoid model of each geometric error that was generated by simulation of axis movement based on homogeneous transformation matrices (HTMs) as general best-fit curve. To verify the proposed method, we extract a well-known geometric error of linear axes and compare it with the result from a commercial measurement system. This method is applicable to both a full circle and a truncated DBB test path. Then, we use the method to estimate the geometric error of axis interaction between linear and rotary axes in a five-axis machine. A sequence of DBB tests is arranged based on linear-linear and linear-rotary simultaneous motions. The tests contain seven DBB test runs with two setups, and are able to identify eleven geometry errors of interaction of axes in less time, and with less human “intervention” error.</P>
Coprime Factor Reduction of Parameter Varying Controller
Roberd Saragih,Widowati 대한전기학회 2008 International Journal of Control, Automation, and Vol.6 No.6
This paper presents an approach to order reduction of linear parameter varying controller for poly topic model. Feasible solutions which satisfy relevant linear matrix inequalities for constructing full-order parameter varying controller evaluated at each poly topic vertices are first found. Next, sufficient conditions are derived for the existence of a right coprime factorization of parameter varying controller. Furthermore, a singular perturbation approximation for time invariant systems is generalized to reduce full-order parameter varying controller via parameter varying right coprime factorization. This generalization is based on solutions of the parameter varying Lyapunov inequalities. The closed loop performance caused by using the reduced order controller is developed. To examine the performance of the reduced-order parameter varying controller, the proposed method is applied to reduce vibration of flexible structures having the transverse-torsional coupled vibration modes.
Romat SARAGIH,Mahir PRADANA,Elvira AZIS,Thasania Fitri DRIANA,Naurah Salsabila RAMADHANA 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.7
This study examines the role of effective human resource practices and work-life balance in various organizations and their relationship with employee engagement. The data for this study were obtained from 723 employees from various industries in Java. The result suggests that human resource practice alone did not influence employee engagement. However the human resource policy helps develop a sense of WLB for an employee, which in the long run will affect the level of engagement. Thus, work-life balance enables the relationship between employees and their workplace. This study also encompasses current literature regarding huan resource policies in understanding employee engagement through work-life balance. This study provides exploratory findings regarding HR function practices, WLB, and employee involvement in service organizations. It proved that participants from four organizations reported very positive impressions about HR practices and they were also very involved in their work and organization. While their balance still needs to be improved, this may imply that the participants are not happy with their work lives. The main finding of this study is that WLB plays a mediating role in the relationship between HR practices and employee engagement. This means that organizations need to find ways to help employees achieve a better WLB.
SU-8 마스크를 이용한 유리의 입자분사 미세가공 정밀도 평가
A. S. Saragih,고태조(T. J. Ko),김희술(H. S. Kim),박영우(Y. W. Park),이인환(I. H. Lee) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
SU-8 can be implemented as a mask for micro Abrasive Jet Machining (micro-AJM) process [1]. In this paper, we will evaluate the quality of micro grooving result on glass substrate by micro-AJM process which using SU-8 as a mask. It was evaluated on width and edge profile of the micro grooving. The result was having distortion compare with the master film used to pattern the SU-8 mask. The value of distortion with other properties which came along with it, such as depth and surface roughness, can be optimized in order to fabricate micro-channel for micro-fluidic application.
Agung Shamsuddin Saragih,고태조 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.10
An alternative method is developed to remove metal from a work piece by combining a digital lithography system with biomachining. The purpose of this system is to obtain extra advantages as compared to conventional micro-fabrication processes currently used in practice. The use of microorganisms as a cutting tool in biomachining can eliminate the use of hazardous chemical materials, and the target surface is not affected by heat as a result of machining. The proposed process has a low material removal rate, but with less energy consumption. The greatest advantage is that the tools used in biomachining can be cultured continuously; i.e., they are renewable. Theoretically,the resolution of biomachining can reach 1 um due to the size of the bacteria. To achieve selective material removal, we combine the biomachining process with a polymer mask generated by a digital lithography (DL) system. In order to minimize errors and noise, the DL system was constructed by choosing robust and commonly available devices for most of the sub-tasks. This construction then can bring projected image onto work piece surface on fully controlled.