Brake press system safety evaluation with device and human failure modes, repair rates and redundancy = Đánh giá an toàn hệ thống máy chấn thủy lực kết hợp các yếu tố lỗi thiết bị, lỗi người vận hành, khả năng sửa chữa và dự phòng

Abstract

Press brakes are machines widely used in the manufacturing industry to bend metal sheets. They pose risks in terms of equipment failure and worker accidents. In order to prevent these unwanted occurrences, the associated risks must first be analyzed. In this paper, such an analysis is conducted for a press brake system incorporating redundancies such as two operators and two point-of-operation safety devices. The probability of the system being in a failed state where an operator suffers an injury is estimated with the help of a Markov diagram which includes failure and repair rates not only for the devices but also in terms of operators' failures.