Pengendalian Kualitas Proses Produksi Air Di PDAM Tirtanadi Provinsi Sumatera Utara Menggunakan Diagram Kontrol MEWMA Berbasis Residual Model Multioutput Least Square SVR (MLS-SVR)

Aulia, Tita Riza (2021) Pengendalian Kualitas Proses Produksi Air Di PDAM Tirtanadi Provinsi Sumatera Utara Menggunakan Diagram Kontrol MEWMA Berbasis Residual Model Multioutput Least Square SVR (MLS-SVR). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Perusahan Daerah Air Minum (PDAM) Tirtanadi Provinsi Sumatera Utara bergerak dalam penyelenggaraan pelayanan air minum masyarakat di Provinsi Sumatera Utara. Pengendalian kualitas air di PDAM Tirtanadi masih secara univariat, sedangkan secara teori karakteristik kualitas air saling berhubungan dan terdapat autokorelasi akibat dari proses yang dilakukan secara terus-menerus. Pada penelitian ini akan dilakukan pengendalian kualitas pada tiga variabel utama karakteristik kualitas air yaitu keasaman, sisa chlor dan kekeruhan menggunakan diagram kontrol Multivariate Exponentially Weighted Moving Average (MEWMA) berbasis residual model Multioutput Least Square Support Vector Regression (MLS-SVR). Pemodelan MLS-SVR digunakan untuk mengatasi autokorelasi. Input model MLS-SVR ditentukan berdasarkan lag signifikan dari plot PACF, yang pada penelitian ini signifikan pada lag ke-1. Hasil input model MLS-SVR dan kombinasi hyper-parameter optimal menghasilkan nilai residual yang tidak memiliki autokorelasi. Nilai residual digunakan untuk membuat diagram kontrol MEWMA. Pada fase I dengan pembobot 0,25 didapatkan diagram terkendali secara statistik, sedangkan pada fase II menggunakan pembobot yang sama menunjukkan adanya titik-titik pengamatan out of control. Hasil identifikasi variabel penyebab out of control didapatkan variabel keasaman memiliki kontribusi terbesar penyebab out of control. Pengamatan berada diluar batas kendali disebabkan oleh curah hujan yang tinggi dan banjir yang terjadi di Kota Medan. ================================================================================================ PDAM Tirtanadi of North Sumatera Province is a regionally-owned enterprise that manages to provide water services for the people of North Sumatera Province. Water quality control in PDAM Tirtanadi is still univariate, while theoretically the characteristics of water quality are interconnected and there is also an autocorrelation due to the continuous process. In this study, statistical quality control will be carried out on three main variables of water quality characteristics, namely acidity, residual chlorine, and turbidity using a Multivariate Exponentially Weighted Moving Average (MEWMA) control chart based on residual model of Multioutput Least Square Support Vector Regression (MLS-SVR). MLS-SVR modeling is used to overcome autocorrelation. The input results of the MLS-SVR model are determined based on the significant lag of the PACF plot, which in this study, is the first lag. The results of the MLS-SVR input model and the optimal combination of hyper-parameters produce residual values that have no autocorrelation. The residual value is used for the MEWMA control chart analysis. In phase I with a weighting of 0,25 a statistically controlled diagram is obtained, while in phase II using the same weighting it shows that observations are out of control. The variable with the largest contribution to cause the out of control observation is acidity. Observations are out of control caused by high rainfall and flooding that occurred in Medan.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: Air, Autokorelasi, Pengendalian Kualitas, Autocorrelation, MEWMA, MLS-SVR, Quality Control, Water
Subjects: H Social Sciences > HD Industries. Land use. Labor > HD9980.5 Service industries--Quality control.
Divisions: Faculty of Science and Data Analytics (SCIENTICS) > Statistics > 49201-(S1) Undergraduate Thesis
Depositing User: Tita Riza Aulia
Date Deposited: 01 Sep 2021 03:04
Last Modified: 01 Sep 2021 03:04
URI: https://repository.its.ac.id/id/eprint/91372

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