Towards efficient functional safety certification of construction machinery using a component-based approach

2012 ◽  
Author(s):  
Stephan Baumgart ◽  
Joakim Froberg ◽  
Sasikumar Punnekkat
Keyword(s):  
Functional Safety ◽  
Construction Machinery ◽  
Safety Certification

Research of Smart Gird Functional Safety Certification

2012 ◽  
Vol 263-266 ◽  
pp. 3168-3173
Author(s):  
Xiu Li Huang ◽  
Tao Zhang ◽  
Yuan Yuan Ma ◽  
Yu Fei Wang ◽  
Ye Hua
Keyword(s):  
Control System ◽  
Smart Grid ◽  
Control Systems ◽  
Evaluation Process ◽  
Functional Safety ◽  
Industrial Control System ◽  
Industrial Control ◽  
Industrial Control Systems ◽  
Security Issues ◽  
Safety Certification

With the increasing number of attacks against industrial control systems, functions security issues of the smart grid industrial control system gradually become the focus of research in the field of smart grid. This paper introduced smart grid industrial control systems threats which faced and incidents firstly, and analyzed the current situation of the functional safety certification, including certification bodies, certification tools and certification classes; Then, researched the smart grid industrial control system functional safety certification, gave the content of the smart grid industrial control system functional safety certification, and made the design of its hardware evaluation process; Finally, we discuss the research status of functional safety certification, and pointed out the problems that the smart grid industrial control system functional safety faces.

Impact Assessment of Dynamic Characteristics on the Hydraulic Driven Machinery Operation

2018 ◽  
pp. 1-12
Author(s):  
A. D. Terenteva
Keyword(s):  
Dynamic Error ◽  
Total Error ◽  
Soil Layer ◽  
Hydraulic Drive ◽  
Hydraulic Cylinder ◽  
Working Mechanism ◽  
Automated Control ◽  
Vertical Coordinate ◽  
Construction Machinery ◽  
The Difference

In civil engineering in Russia, trenching for utilities is currently under digging. To perform such works, it is necessary to use high-precision construction machinery, because inaccurate performance of works can lead to the break down of existing utilities, thereby affecting the residents of nearby houses and demanding the additional works for renewal.The most universal labour saver to perform construction works is hydraulic driven single-bucket excavators, which provide up to 38% of works. Therefore, to improve technical characteristics that affect the accuracy of the work performed is an important task.High requirements for the performance of works are defined by existing construction regulations: an allowable soil layer to remain is at most 0.05 m. To fulfil such requirements, an exact assessment of the working mechanism position and a trench profile is necessary.Examination of a manually operated digging process shows that an operator provides operations untimely, however an automated control system can solve this problem. Dynamic phenomena in the working mechanism have the greatest impact on the accuracy of the works performed.To assess the bucket digging edge position accuracy, a mathematical model of the working mechanism has been created. Based on the cycle scheme of the working process, the excessive displacements of the hydraulic cylinder rods under the load are taken into account. By the end of the cycle, the difference between the specified and obtained positions along the vertical coordinate has been 0.0892 m.A dynamic error of the hydraulic drive system of the working mechanism is considered as a sum of the error due to excessive displacements of the hydraulic cylinder rods and the error due to delay of the hydraulic drive, with the latter being calculated for the average time of delay taking into account the data available in the literature. The total error of the bucket digging edge position of the working mechanism is 0.1176 m, which is 2 times more than the value of 0.05 mConformity of all the links with specification requirements does not guarantee compliance with the required displacement accuracy of the bucket digging edge, and, thus, the soil layer to remain in the base of the trench can exceed the regulated value of 0.05 m.

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