scholarly journals Features of parachute systems testing during their creation

2020 ◽  
Vol 23 (1) ◽  
pp. 84-94
Author(s):  
S. M. Kurinnyy
Keyword(s):  
Detection System ◽  
System Operation ◽  
Flight Tests ◽  
Chief Designer ◽  
Phase Trajectories ◽  
Emergency Situations ◽  
Operation Conditions ◽  
Parachute System ◽  
Time Buffer ◽  
Emergency Detection

The article describes a number of stages in the creation of parachute systems for military and special purposes and some features of executing their testing. The necessity of development flight tests and their peak modes are analyzed in details. The feasibility of recovery parachute system creation for saving the weight model during the flight tests connected with checking of parachute systems strength is proved. The procedure of putting the recovery parachute system into the action scheme of the tested parachute system is suggested. The sequence and the stages of three-cascade recovery parachute system operation consisting of the auxiliary parachute, the drogue parachute and the main one are given. The analysis of this system operation considering the phase trajectories of the recovery parachute system and the tested parachute system movement is conducted. Development of possible emergency situations of the tested parachute system including the phase trajectories of motion at all stages is considered. The phase trajectories of motion are given taking into account test envelope with overlapping of the maximum operation conditions and acceleration modes. Development of emergencies is analyzed considering time buffer to put the recovery parachute system into operation. The article considers the example of creating the emergency detection system and its operating procedure when putting the recovery parachute system into action. Positive results from introduction of the recovery parachute system into the flight tests when creating parachute systems for different purposes are predicted. A new strategy of executing flight tests with the introduction of an updated (by the decision of the Chief Designer) test program is proposed. Extension of the test envelope will enable to significantly advance information awareness of the flight experiment, efficiency and quality of its results. Introduction of the emergency detection system will considerably improve reliability of the tested parachute system operation.

scholarly journals PLANNING OF EXPERIMENTAL STUDIES OF THE "FOUNDATION-BASE" SYSTEM IN CASE OF SUDDEN OVERLOADS

2020 ◽  
pp. 5-12
Author(s):  
I. M. Diakov ◽  
M. I. Diakov ◽  
B. Y. Barykin
Keyword(s):  
Experimental Studies ◽  
Normal Operation ◽  
Base System ◽  
System Operation ◽  
Foundation Soil ◽  
Soil System ◽  
Emergency Situations ◽  
Foundation Base ◽  
Sudden Loading ◽  
Experimental And Theoretical Studies

The relevance of experimental and theoretical studies of the work of the foundation-foundation system in sudden burdens is justified. It was established that sudden loads can occur both in emergency situations and in the course of normal operation. The main criterion of sudden loading is the rate of additional or main (operational) loading, which is higher than the rate of stress redistribution in the base. In order to identify the main features of the foundation-foundation system and plan further studies, the results of preliminary experiments of the interaction of foundations with the soil base during sudden loads were analyzed. The accepted method of experimental research is described, the characteristics of the models of foundations and the power system used for testing are given. Some features of "foundation-soil" system operation in case of sudden loading are defined. Based on the conducted experiments, the need for further study of the foundation-foundation system in case of sudden loading was substantiated and the experiments were planned.

scholarly journals Acceptance of Smart Electronic Monitoring at Work as a Result of a Privacy Calculus Decision

Informatics ◽  
2019 ◽  
Vol 6 (3) ◽  
pp. 40
Author(s):  
Evgenia Princi ◽  
Nicole C. Krämer
Keyword(s):  
Electronic Monitoring ◽  
Detection System ◽  
Monitoring Systems ◽  
The Internet ◽  
Privacy Concerns ◽  
User Data ◽  
Privacy Calculus ◽  
System Acceptance ◽  
Emergency Detection ◽  
The Internet Of Things

Smart technology in the area of the Internet of Things (IoT) that extensively gathers user data in order to provide full functioning has become ubiquitous in our everyday life. At the workplace, individual’s privacy is especially threatened by the deployment of smart monitoring technology due to unbalanced power relations. In this work we argue that employees’ acceptance of smart monitoring systems can be predicted based on privacy calculus considerations and trust. Therefore, in an online experiment (N = 661) we examined employees’ acceptance of a smart emergency detection system, depending on the rescue value of the system and whether the system’s tracking is privacy-invading or privacy-preserving. We hypothesized that trust in the employer, perceived benefits and risks serve as predictors of system acceptance. Moreover, the moderating effect of privacy concerns is analyzed.

Emergency Detection System Using PDA Based on Self-Response Algorithm

2007 ◽  
Author(s):  
Ah-young Jeon ◽  
Soo-young Ye ◽  
Jun-mo Park ◽  
Kwang-nyeon Kim ◽  
Jae-hyung Kim ◽  
...  
Keyword(s):  
Detection System ◽  
Emergency Detection

scholarly journals On the Use of Cameras for the Detection of Critical Events in Sensors-Based Emergency Alerting Systems

2020 ◽  
Vol 9 (4) ◽  
pp. 46
Author(s):  
Daniel G. Costa ◽  
Francisco Vasques ◽  
Paulo Portugal ◽  
Ana Aguiar
Keyword(s):  
Urban Areas ◽  
Smart Cities ◽  
Distributed Monitoring ◽  
Critical Events ◽  
Visual Sensors ◽  
Emergency Situations ◽  
Visual Sensing ◽  
Negative Impacts ◽  
Emergency Detection ◽  
Alerting Systems

The adoption of emergency alerting systems can bring countless benefits when managing urban areas, industrial plants, farms, roads and virtually any area that is subject to the occurrence of critical events, supporting in rescue operations and reducing their negative impacts. For such systems, a promising approach is to exploit scalar sensors to detect events of interest, allowing for the distributed monitoring of different variables. However, the use of cameras as visual sensors can enhance the detection of critical events, which can be employed along with scalar sensors for a more comprehensive perception of the environment. Although the particularities of visual sensing may be challenging in some scenarios, the combination of scalar and visual sensors for the early detection of emergency situations can be valuable for many scenarios, such as smart cities and industry 4.0, bringing promising results. Therefore, in this article, we extend a sensors-based emergency detection and alerting system to also exploit visual monitoring when identifying critical events. Implementation and experimental details are provided to reinforce the use of cameras as a relevant sensor unit, bringing promising results for emergencies management.

An Integral Method to Improve PLL Performance under Unbalanced Electric Grid Conditions

2013 ◽  
Vol 347-350 ◽  
pp. 1318-1322
Author(s):  
Shu Jun Yao ◽  
Ming Ran Bao ◽  
Ya Nan Hu ◽  
Min Xiao Han ◽  
Jun Xian Hou ◽  
...  
Keyword(s):  
Integral Method ◽  
Harmonic Signal ◽  
Reverse Polarity ◽  
System Operation ◽  
Power System Operation ◽  
Double Frequency ◽  
Operation Conditions ◽  
Synchronous Reference Frame ◽  
Three Phase ◽  
Simulation Results

Accurate phase information on three-phase grid voltage and currents which are supplied by PLL are needed in power system operation. Conventional three-phase synchronous reference frame-based phase locked loop is generally sufficient during balanced operation conditions. But unbalanced in input signal set causes a double-frequency ripple. The output signal is not ideal. There are lots of improved SRF-PLL methods, aiming at removing the double-frequency ripple such as DSC-PLL,MAF-PLL, but these methods may causes a certain time delay. DIF-PLL method is based on adding another signal, which has reverse polarity ripple. It may amplify the harmonic signal. In this paper, an INT-PLL method based on integral is proposed, which wont amplify the harmonics. The comparison of these methods and simulation results are given in this paper.

Incorporation of RD-180 Failure Response Features in the Atlas V Booster Emergency Detection System

2011 ◽  
Author(s):  
John Hansen ◽  
Paul Connolly ◽  
James Larkin ◽  
Bonita Preston ◽  
Polina Lelchuk ◽  
...  
Keyword(s):  
Detection System ◽  
Emergency Detection

Quantitative Analysis of Noise Impact on Duffing Chaotic Detection System Using Lyapunov Characteristic Exponents

2011 ◽  
Vol 130-134 ◽  
pp. 1331-1337
Author(s):  
Wen Jing Hu ◽  
Zhi Zhen Liu ◽  
Zhi Hui Li
Keyword(s):  
Detection System ◽  
Signal To Noise Ratio ◽  
Duffing Oscillator ◽  
Threshold Value ◽  
System State ◽  
Signal To Noise ◽  
Phase Trajectories ◽  
Lyapunov Characteristic Exponents ◽  
Noise Ratio ◽  
System States

Performance of the Duffing oscillator to detect weak signals buried in heavy noise is analyzed quantitatively by LCEs. First in the case of noise, differential equations to compute LCE s are derived using RHR algorithm, so the quantitative criteria to identify system states are obtained. Then using LCEs, the threshold value of the forced periodic term is found accurately. Finally the system state and state change are analyzed using LCEs by keeping the threshold value and varying the noise intensity, and the minimum signal to noise ratio is determined. By contrast of phase trajectories and LCEs, it shows that phase trajectories disturbed by strong noise sometimes are ambiguous to our eyes, but through LCEs, the system state can be identified clearly and quantitatively especially in strong noise background. So the minimum signal to noise ratio can be obtained accurately.

scholarly journals Emergency Detection System using PDA based on Self-response Algorithm

2007 ◽  
Vol 8 (6) ◽  
pp. 293-298
Author(s):  
Ah-Young Jeon ◽  
Jun-Mo Park ◽  
Gye-Rok Jeon ◽  
Soo-Young Ye ◽  
Jae-Hyung Kim
Keyword(s):  
Detection System ◽  
Emergency Detection
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