scholarly journals Can FMA (Noise) 1989 Prevent Occupational NoiseInduced Hearing Loss? An Evaluation using Fault Tree Analysis

2020 ◽  
Vol 18 (3) ◽  
Author(s):  
Ahmad MA ◽  
Razali A
Keyword(s):  
Hearing Loss ◽  
Noise Exposure ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Control Measures ◽  
Contributing Factors ◽  
Top Down ◽  
Tree Analysis ◽  
Sequence Of Events ◽  
Single Top

Introduction: Factory and Machinery Act (Noise Exposure) Regulation 1989 (FMA [Noise] 1989) has been implemented in Malaysia for nearly 30 years, but noise-induced hearing loss (NIHL) cases is still rising. Fault tree analysis is a top-down approach to analyzing incidences of 'failures', starting with establishing the single top event that will eventually cause NIHL, followed by identification of the contributing factors to the top event which are the immediate or basic events. Through its visual, structural and deductive approach; FTA is able to depict the temporal sequence of events and their interactions in a formal and logical hierarchy. Materials and Methods: Employees with permanent standard threshold shifts (PSTS) underwent further assessment confirming the presence of NIHL. A single common fault tree was constructed based on six cases of PSTS. The top event is the PSTS. Intermediate and basic events were identified and mapped with relevance to the provisions in the FMA (noise) 1989 indicating how failed control measures have resulted in the PSTS cases. Results: The constructed fault tree with its branches illustrated how breach or noncompliance of FMA (Noise) 1989 resulted in the eventual top event (NIHL). Conclusion: FTA provides a standardized perspective of errors within the system in preventing NIHL.

Application of Fault Tree Analysis and Swiss Cheese Model to the Overspeed Derailment of Puyuma Train in Yilan, Taiwan

2020 ◽  
Vol 2674 (5) ◽  
pp. 33-46
Author(s):  
Jyh-Cherng Jong ◽  
Yung-Cheng (Rex) Lai ◽  
Cheng-Chung Young ◽  
Yu-Fu Chen
Keyword(s):  
Process Analysis ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Swiss Cheese ◽  
Contributing Factors ◽  
Tree Analysis ◽  
Train Control ◽  
Swiss Cheese Model ◽  
Express Train ◽  
Cheese Model

On October 21, 2018, a Puyuma express train went overspeed through a sharp curve and derailed in Yilan, Taiwan. This accident resulted in 18 fatalities and 267 injuries. Although such accidents occur once in a while worldwide, this case of an overspeed derailment from a train-set equipped with an automatic train protection (ATP) system (similar to the function of Positive Train Control (PTC) in the U.S.) is rare. A temporary investigation team was appointed by the Executive Yuan, the highest administrative organ in Taiwan, and the investigation was completed within 2 months. This paper presents the process, analysis, findings, and recommendations from the accident investigation. The accident was first analyzed using fault tree analysis to identify potential causes and contributing factors of this derailment. The results were then categorized into layers of defenses by using a Swiss cheese model. We further extended the original Swiss cheese model to a “time-dependent Swiss cheese model” to demonstrate how the barriers were penetrated at different times by incorporating the timestamps of important events. Another modified Swiss cheese model called “causal relationship Swiss cheese model” was presented to further demonstrate the causal relationships. With the proposed process and models, the immediate causes and contributing factors were quickly identified and presented in a way that could be easily understood by the general public. The results showed that the ATP system (or the PTC) cannot guarantee 100% safety. A review of the safety culture and corresponding procedures is important to ensure the safety of railway operations.

scholarly journals IMPLEMENTASI METODE FAULT TREE ANALYSIS UNTUK ANALISIS KECACATAN PRODUK

2019 ◽  
Vol 4 (1) ◽  
pp. 47
Author(s):  
Saiful Mangengre
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Top Down ◽  
Tree Analysis

Penelitian ini bertujuan untuk menganalisis sistem pengendalian kualitas produksi pada PT. Y serta mengidentifikasi penyebab-penyebab kecacatan produk. Pada penelitian ini metode yang digunakan adalah Fault Tree Analysis yaitu sebuah metode pengendalian kualitas yang digunakan untuk menelusuri kecacatan secara top-down approach dengan menganalisis kesalahan system dari kumpulan objek-objek yang saling berinteraksi. Hasil dari penelitian ini menunjukan bahwa pengendalian kualitas produk ada PT. Y  belum maksimal, dengan rata-rata kecacatan produk sebesar 4.47 % per hari. Jenis kecacatan yang paling banyak terjadi adalah  tinta buram dengan total 57.555 eksemplar atau 78% dari total produk cacat pada periode yang diamati. Dari hasil observasi lapangan dan wawancara, faktor-faktor yang menjadi penyebab kecacatan ini adalah faktor manusia, mesin, lingkungan, metode kerja dan bahan baku.

Analisis Penurunan Capaian Target Produksi Bijih Nikel Menggunakan Metode Fault Tree Analysis di PT Ifishdeco Provinsi Sulawesi Tenggara

2020 ◽  
Vol 24 (1) ◽  
pp. 45-50
Author(s):  
Aryanti Virtanti Anas ◽  
Yoshita P Parissing ◽  
Irzal Nur ◽  
Sufriadin Sufriadin ◽  
Purwanto Purwanto ◽  
...  
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Top Down ◽  
Tree Analysis ◽  
Minimal Cut Set ◽  
Minimal Cut ◽  
Selective Mining ◽  
Cut Set ◽  
Production Target ◽  
Main Factor

Abstrak Proses produksi berarti menghasilkan suatu produk yang bernilai guna. Dalam suatu perusahaan pertambangan, produksi merupakan hal yang sangat penting, sehingga diperlukan perencanaan yang matang. Perusahaan menargetkan jumlah bahan galian yang akan diproduksi baik dalam jangka panjang, menengah maupun jangka pendek. Operasi produksi PT. Ifishdeco menggunakan bantuan alat gali muat excavator Komatsu PC 300 dimana terjadi penurunan produksi bijih nikel sebesar 19,94%. Target produksi sebesar 149.934 mt, namun capaian produksi hanya sebesar 116.603mt. Oleh karena itu, penelitian ini dilakukan untuk mengetahui faktor utama dan nilai probabilitas penyebab turunnya capaian produksi. Salah satu metode yang dapat digunakan untuk menganalisis faktor utama penyebab penurunan capaian produksi adalah menggunakan Fault Tree Analysis (FTA). Persamaan logika top down dari Fault Tree Analysis disubstitusi ke dalam aljabar Boolean hingga diperoleh minimal cut set. Minimal cut set merupakan persamaan akhir yang merincikan top down. Top event penurunan capai target produksi memiliki empat top down, yaitu faktor pengisian, kesiapan fisik alat, efektivitas kerja, dan waktu edar alat gali muat. Berdasarkan nilai probabilitas basic event tertinggi yang bernilai 1, maka faktor utama penyebab penurunan capaian produksi adalah dari faktor umur pakai alat tua, penjadwalan perawatan tidak teratur, kualitas alat buruk, dan proses selective mining.   Abstract Analysis of Decrease in Nickel Ore Production Targets Using the Fault Tree Analysis Method in PT Ifishdeco, Southeast Sulawesi Province. Production process meant produce product with beneficial value. At the mining company, production was very important, so it needed to be well-planned. Company was making target amount of digging material to be produced in long term, middle term, and short term. Production operation at PT Ifishdeco utilized digger loader equipment namely excavator Komatsu PC 300. There was decreasing in nickel ore production of 19,94%. Production target was 149,934 mt, but the company was only able to meet 116,603 mt. Objective of this study was to know main factor and probability value which caused the low production performance. One of methods to be used to analyze the main factor was Fault Tree Analysis (FTA). Top down logical equations of Fault Tree Analysis was substituted into Boolean algebra to get minimal cut set. Minimal cut set was a formula of the top down and used to calculate probability. Top event of the decreasing of the production target had four top downs which were filling factor, mechanical availability, effectivity of use, and cycle time of digger loader. Based on the highest probability of basic event which value was equal to 1, the main factor caused the decreasing of productivity were lifetime of equipment, unscheduled of maintenance, low quality of equipment, and selective mining.   Kata Kunci: Excavator, Work Effectivity, Boolean, Cut Set, Probability

Fault Tree Analysis (FTA) via Binary Diagram Decision (BDD) for Information Systems Design

2013 ◽  
pp. 308-319
Author(s):  
Fausto Pedro García Márquez ◽  
Alberto Pliego Mangurán ◽  
Noor Zaman
Keyword(s):  
Comparative Analysis ◽  
Quantitative Analysis ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Systems Design ◽  
Heuristic Methods ◽  
Top Down ◽  
Tree Analysis ◽  
Binary Diagram

A fault tree analysis (FTA) is presented as a qualitative method for studying the state of the WT as a system considering to its different sub-systems. The quantitative analysis of the FTA is done by Binary Diagram Decision (BDD). The size of the BDD generated by the transformation from FTA to BDD will depend of the ordering of the FTA events. This work employed the top-down-left-right, the level, and the “and” methods for listing the events. Finally, a classification of the events is done based on their importance measures. The importance measures has been calculated by the Birnbaum (1969), Critically and Structural heuristic methods. A comparative analysis is done, and the main results are presented.

scholarly journals PENERAPAN METODE FAULT TREE ANALYSIS UNTUK MENGANALISA KURANGNYA SUPPLY AIR TAWAR KE AKOMODASI KARENA KETIDAKNORMALAN KERJA HYDROPHORE TANK

2017 ◽  
Vol 7 (2) ◽  
pp. 1692-1703
Author(s):  
I. Rizal ◽  
Febria Surjaman ◽  
Suwondo
Keyword(s):  
Fault Tree ◽  
Fault Tree Analysis ◽  
Feed Water ◽  
Water Pump ◽  
Top Down ◽  
Relief Valve ◽  
Tree Analysis ◽  
Root Cause ◽  
Undesired Event

Untuk menjaga kualitas dan kuantitas air tawar di atas kapal, salah satunya dapat  menggunakan sistem suplai air tawar untuk kebutuhan air tawar di atas kapal, dengan  menggunakan hydrophore tank suplai air tawar di atas kapal bisa terpenuhi sampai ke  akomodasi dengan baik, mensuplai air tawar dari kamar mesin ke akomodasi yang tetap  berkualitas meskipun dalam penampungan dalam tangki air tawar yang lama dan air tawar itu  tidak banyak yang menurun kualitasnya. Apabila kebutuhan akan air tawar itu tidak terpenuhi  pada saat kita akan berlayar, maka perlu dilakukan bunker air tawar agar kebutuhan air tawar  di atas kapal dapat tercukupi.  Metode yang digunakan dari penelitian ini adalah fault tree analysis yang mengahasilkan  faktor-faktor yang dapat mempengaruhi ketidaknormalan kerja hydrophore. Fault Tree Analysis  adalah metode analisa, dimana terdapat suatu kejadian yang tidak diinginkan disebut undesired  event terjadi pada sistem, dan sistem tersebut kemudian dianalisa dengan kondisi lingkungan  dan operasional yang ada unik menemukan semua cara yang mungkin terjadi yang mengarah  pada terjadinya undesired event tersebut. Metode ini dilakukan dengan pendekatan yang  bersifat top down, yang diawali dengan asumsi kegagalan atau kerugian dari kejadian puncak  (Top Event) kemudian merinci sebab-sebab suatu Top Event sampai pada suatu kegagalan dasar  (Root Cause).  Tujuan dari penelitian ini adalah untuk dapat mengetahui apa saja yang mempengaruhi  ketidaknormalan kerja hydrophore tank terhadap suplai air tawar ke akomodasi di MT. Sambu  dengan menggunakan metode fault tree analysis yang menghasilkan faktor-faktor yang dapat  mempengaruhi ketidaknormalan kerja hydrophore tank ketika beroperasi dan berhenti terlalu  sering, masalah suplai air tawar, masalah pada feed water pump dan relief valve bermasalah.  Hasil penelitian ketidaknormalan kerja hydrophore tank terhadap supply air tawar ke  akomodasi, penyusun dapat menyimpulkan faktor-faktor yang tidak dapat lagi diselidiki dari  setiap penyebab top event yaitu feed water pump tidak bekerja dengan baik, mengalami masalah  pada suplai air tawar, dan mengalami masalah pada relief valve.   

Safety Analysis of Tower Crane Based on Fault Tree

2012 ◽  
Vol 163 ◽  
pp. 66-69 ◽  
Author(s):  
Qing Wang ◽  
Li Xie
Keyword(s):  
Safety Management ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Control Measures ◽  
Human Beings ◽  
Tree Model ◽  
Tree Analysis ◽  
Construction Machinery ◽  
Tower Crane ◽  
Accident Tree

Tower crane are widely used in construction and installation in our country, especially in high-rise building, tower crane is indispensable construction machinery. But the tower crane accident happen high frequency. This essay based on the accident tree analysis methods, combined with tower crane accident type which establish accident tree model, and then resolve the minimal segmental sets, analysis the accident cause factor, According to the qualitative analysis and quantitative analysis of fault tree analysis, we can put forward some prevention ways and control measures to the tower crane accident in those aspects of unsafe actions of the human beings, insecure status of objects and the defects in safety management.

COVID-19 infection risk management during construction activities: An approach based on Fault Tree Analysis (FTA)

2020 ◽  
Vol 18 (7) ◽  
pp. 161-176
Author(s):  
Tarik Bakeli ◽  
Adil Alaoui Hafidi, PhD
Keyword(s):  
Negative Impact ◽  
Probabilistic Approach ◽  
Fault Tree ◽  
Health And Safety ◽  
Fault Tree Analysis ◽  
Infection Risk ◽  
Control Measures ◽  
Risk Of Infection ◽  
Health Crisis ◽  
Tree Analysis

The coronavirus COVID-19 pandemic is the worst health crisis of our time and the greatest challenge we are facing since World War II. It has caused a negative impact on engineering and construction industry, and huge uncertainty about the ability to anticipate a planned recovery for the industry. Waiting for an effective recovery that may take a long time, science has to provide solutions to coexist with this virus and resume the work on construction sites. In fact, it is not the first time that health and safety science deals with such a risk of infection, as many guidelines treat the manner to reduce the risk of infection to at-risk employees in construction, renovation, installation, and maintenance activities. This article aims to perform an infection risk analysis, taking into consideration COVID- 19 particularities, and to identify control measures to ensure COVID-19 infection prevention and management on site. The study will be based on a probabilistic approach using the Fault Tree Analysis method.

scholarly journals Analisis Kegagalan Operasional Mesin Chiller dengan Metoda FTA dan FMEA

2020 ◽  
Vol 4 (2) ◽  
pp. 19
Author(s):  
Aryudi Susilo ◽  
R Ismet Rohimat ◽  
Hennie Husniah
Keyword(s):  
Failure Mode ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Top Down ◽  
Effect Analysis ◽  
Tree Analysis

        Mesin air chiller adalah bagian dari sistem penyediaan dan penyediaan udara bersih dan dingin ke area bangunan. Kerusakan pada komponen mesin chiller telah mengurangi pasokan udara dingin ke area Mall. FTA (Fault Tree Analysis) dan FMEA (Failure Mode dan Effect Analysis) digunakan untuk melacak kasus-kasus kegagalan chiller engine, dengan penekanan pada analisis "pendekatan top-down", yang merupakan analisis menyeluruh mulai dari sistem tingkat atas dan meneruskannya turun, sehingga diharapkan dapat menjadi solusi yang tepat dalam menangani masalah pasokan udara dingin ke gedung Mall, dan dengan metode itu diharapkan juga dapat memberikan proposal dari penjadwalan pemeliharaan dengan membedakan perilaku penjadwalan sesuai dengan tingkat kritis dari masalah setiap unit komponen mesin chiller.

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