scholarly journals Features of practical application of electric power system’s stability estimation methods

2021 ◽  
Vol 1901 (1) ◽  
pp. 012069
Author(s):  
A V Bubnov ◽  
V V Barskov ◽  
A N Kirichenko ◽  
A V Schekochikhin ◽  
G V Malgin
Keyword(s):  
Electric Power ◽  
Estimation Methods ◽  
Practical Application ◽  
Stability Estimation

Effect of Load-Dependent Friction on the Estimation of Rack Force in Electric Power-Assisted Steering System

2019 ◽  
Vol 141 (11) ◽  
Author(s):  
Yijun Li ◽  
Taehyun Shim ◽  
Dexin Wang ◽  
Timothy Offerle
Keyword(s):  
Electric Power ◽  
A Priori ◽  
Estimation Method ◽  
Estimation Algorithm ◽  
Steering System ◽  
Estimation Methods ◽  
Current Steering ◽  
Force Estimation ◽  
Operation Conditions ◽  
Friction Estimation

The rack force is valuable information for a vehicle dynamics control system, as it relates closely to the road conditions and steering feel. Since there is no direct measurement of rack force in current steering systems, various rack force estimation methods have been proposed to obtain the rack force information. In order to get an accurate rack force estimate, it is important to have knowledge of the steering system friction. However, it is hard to have an accurate value of friction, as it is subject to variation due to operation conditions and material wear. Especially for the widely used column-assisted electric power steering (C-EPAS) system, the load-dependent characteristic of its worm gear friction has a significant effect on rack force estimation. In this paper, a rack force estimation method using a Kalman filter and a load-dependent friction estimation algorithm is introduced, and the effect of C-EPAS friction on rack force estimator performance is investigated. Unlike other rack force estimation methods, which assume that friction is known a priori, the proposed system uses a load-dependent friction estimation algorithm to determine accurate friction information in the steering system, and then a rack force is estimated using the relationship between steering torque and angle. The effectiveness of this proposed method is verified by carsim/simulink cosimulation.

Comparative Study of Rack Force Estimation for Electric Power Assist Steering System

2017 ◽  
Author(s):  
Yijun Li ◽  
Taehyun Shim ◽  
Dexin Wang ◽  
Timothy Offerle
Keyword(s):  
Control System ◽  
Electric Power ◽  
Vehicle Dynamics ◽  
System Development ◽  
Steering System ◽  
Estimation Methods ◽  
Simulation Environment ◽  
Force Estimation ◽  
Adaptation Algorithm ◽  
Estimation Algorithms

For an electric power assist steering (EPAS) control system, it is important to know the rack force information to improve the steering feel control performance. Since there is no direct measurement of rack force in current EPAS system, there have been various rack force estimation algorithms proposed for the control system development. In this paper, two existing rack force estimation methods (based on steering system dynamics and vehicle dynamics) have been implemented in the simulation environment to compare its performance. The effectiveness and limitations of two methods have been analyzed using a simulation of high fidelity EPAS model with various inputs conditions. In addition, new adaptation algorithm is proposed to further improve the estimation performance of the existing methods.

TAKING RISK FACTORS INTO ACCOUNT DURING ASSESSING BANK’S FINANCIAL STABILITY IN UKRAINE

2019 ◽  
Vol 10 (2) ◽  
pp. 85-93
Author(s):  
Pavlo Ilchuk ◽  
Olha Kots
Keyword(s):  
Risk Factors ◽  
Financial Stability ◽  
Scientific Literature ◽  
Risk Indicators ◽  
Annual Reports ◽  
Estimation Methods ◽  
Stability Estimation

In the article, the scientific literature on risk accounting when assessing a bank’s financial stability has been analyzed. The necessity of the bank’s financial stability estimation methods improving with consideration of risk factors has been identified. The set of indicators – “risk indicators” - which can be calculated on the basis of the bank’s annual reports, has been proposed. The proposed indicators have been tested on the example of three Ukrainian banks. The approach to interpreting the results of the risk indicators assessment and the list of recommended actions for managing the bank’s financial stability with consideration of risk factors have been proposed.

scholarly journals Comparison of Stability Estimation Methods for Masonry Walls

1998 ◽  
Vol 18 ◽  
pp. 139-152 ◽  
Author(s):  
Kunihiro TANAKA ◽  
Yoji NIITANI ◽  
Kiyoomi YAMADA
Keyword(s):  
Estimation Methods ◽  
Masonry Walls ◽  
Stability Estimation

scholarly journals Application of Data Encryption Technology in Electric Power Informationization

2020 ◽  
Vol 204 ◽  
pp. 02003
Author(s):  
Cai Yingkai ◽  
Zhang Ye ◽  
Cao Shilong ◽  
Mu Rong
Keyword(s):  
Information Security ◽  
Power System ◽  
Detailed Analysis ◽  
Electric Power ◽  
Data Security ◽  
Data Encryption ◽  
Economic Losses ◽  
Practical Application ◽  
Information Security Management ◽  
Encryption Method

A large amount of data information will be generated during the construction and operation of the power system, and once these data are leaked, it will undoubtedly threaten the information security of power users, which will bring avoidable economic losses to power companies and users. Therefore, many electric power companies are paying more and more attention to data security, and data encryption technology solves this problem well. And this article has launched a detailed analysis on the application of data encryption technology in the construction of electric power information. At the same time, it has carried out an in-depth discussion with the practical application of the two-layer encryption method in the informationization of electric power enterprises. I hope the research results of this article It can provide a certain reference for the information security management of the power system.

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