Means for providing information about danger to an employee equipped with an individual vibrating warning system

2019 ◽  
Vol 572 (5) ◽  
pp. 21-23
Author(s):  
Rafał Młyński ◽  
Emil Kozłowski ◽  
Leszek Morzyński
Keyword(s):  
Work Environment ◽  
Warning System ◽  
Vibration Signal ◽  
Original Research ◽  
Vibration Signals ◽  
Moving Vehicle ◽  
Research Results ◽  
Advantages And Disadvantages ◽  
Hearing Protectors ◽  
The Impact

The use of hearing protectors is a frequent way to avoid the impact of noise present in the work environment. However, it should be kept in mind that the use of hearing protectors, while reduces the threat created by noise, also diminishes the perception of sounds that are important for the safety of the employee. In such cases, employee’s safety can be improved/increased by using a system to detect the near presence of a moving vehicle. Such a system should be able to transmit information on detected danger to an employee using hearing protectors. The article discusses the possible ways of providing such information to employees using hearing protectors. The advantages and disadvantages of using acoustic, light and vibration signals for this purpose were considered. The authors also present original research results to confront the possibility of perceiving the vibration signal produced by two types of wearables.

COMBINED SIGNAL PROCESSING METHOD FOR DIAGNOSIS AND MONITORING OF THE INDUCTION MOTORS OPTIMIZED FOR EMBEDDED SYSTEMS

2021 ◽  
pp. 18-27
Author(s):  
A. L. Morozov
Keyword(s):  
Signal Processing ◽  
Embedded Systems ◽  
Induction Motors ◽  
Vibration Signal ◽  
Constant Load ◽  
Load Level ◽  
Monitoring Systems ◽  
Vibration Signals ◽  
Advantages And Disadvantages ◽  
Fractional Moments

Induction Motors (IM) play a key role in modern industry, so the condition monitoring systems are becoming increasingly relevant. Commercial monitoring systems are usually based on the measurement of IM’s vibrations and the further processing of the measured vibration signals. For those purposes the embedded systems (such as microcontrollers and inexpensive processors) are used. Embedded systems have limited resources, so data processing algorithms should have low computational complexity and require little memory. In this paper, the wellknown methods of processing vibration signals for fault diagnosis of the IM are considered and their main advantages and disadvantages for the implementation in embedded systems are highlighted. The previously proposed method based on a combination of the fast Fourier transform and the statistics of the fractional moments is optimized for vibration signal processing and implementation in embedded systems. The efficiency of diagnosis of such faults as eccentricity and a broke rotor bar, using the proposed method, is verified on the radial vertical vibrations measurements of the real motors under different constant load levels: no load, 50 % of the rated load, 75% of the rated load. The results show that this approach allows accurately diagnose the considered faults independently from the load level.

scholarly journals Impact of Financial Integration on Ethiopian Economic Growth

2019 ◽  
Vol 10 (1) ◽  
pp. 55
Author(s):  
Abdulaziz A Hussen
Keyword(s):  
Economic Growth ◽  
Financial Integration ◽  
Positive Impact ◽  
Negative Influence ◽  
Paper Analysis ◽  
Positive Contribution ◽  
Financial Flows ◽  
Research Results ◽  
Advantages And Disadvantages ◽  
The Impact

This paper analyzes theoretically the role of financial integration on economic growth and empirically examines the influence of financial integration on Ethiopian economic growth. Many researchers find different investigation results during their data analysis on the impact of financial integration on economic growth. The outcome of most researchers indicate that financial integration has a positive contribution to economic growth, while the result of quite a few numbers of researchers suggested that financial integration has a negative influence on economic growth. Similarly, few of them propose that the relationship between these two variables as bi- directional. Furthermore, literatures categorize the impact of financial sector on economic growth into four basic hypotheses. Which are supply leading, demand following, bidirectional, and independent hypothesis. These hypotheses suggest that financial integration has different role on economic growth and all of them are supported by several research results of various researchers. It is considered that the main reason behind these contrasting research results are the level of financial integration and the composition of financial flows. Moreover, the financial crises that occur in recent decades created a heated debate among researchers on the advantages and disadvantages of financial integration. However, most economists agree that financial integration is beneficial to the economy. The result of this paper analysis also shows, financial integration has a positive impact on the Ethiopian economic performance.

scholarly journals Study on the Method for Collecting Vibration Signals from Mill Shell Based on Measuring the Fill Level of Ball Mill

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Peng Huang ◽  
Minping Jia ◽  
Binglin Zhong
Keyword(s):  
High Sensitivity ◽  
Vibration Signal ◽  
Experimental Result ◽  
Vibration Signals ◽  
Vibration Data ◽  
Vibration Sensors ◽  
Coal Powder ◽  
Fill Level ◽  
Steel Balls ◽  
The Impact

At present the method for measuring the fill level which used the vibration signal of mill shell shows its advantage compared with other methods. However, this method is developed late, and the technique for collecting the vibration signal from mill shell is immature. In this paper, a novel method for collecting the vibration data from mill shell is proposed. Firstly, the layout scheme of vibration sensors on mill shell is given by analyzing the axial and circumferential movement of coal powder in roller. And a special data acquisition system is developed, which can acquire vibration data from different axial and circumferential positions on mill shell. Then the sampling frequency is obtained based on impact model and hierarchical model of steel balls. At the same time, the impact region on mill shell caused by steel balls is considered as the collecting region of vibration signals. Experimental result shows that vibration signals collected by the method proposed in this paper present a high sensitivity to the changes on fill level compared with vibration data of mill bearing, which provides a reliable basis for accurate measurement of the fill level.

The Blasting Test with Precise Delayed Time Interval and Wavelet Pocket Analysis for Vibration Signals’ Energy

2014 ◽  
Vol 1023 ◽  
pp. 198-204
Author(s):  
Li He ◽  
Dong Wang Zhong
Keyword(s):  
Total Energy ◽  
Vibration Signal ◽  
Propagation Distance ◽  
Vibration Velocity ◽  
Time Interval ◽  
Blasting Vibration ◽  
Vibration Signals ◽  
Slope Test ◽  
The Impact ◽  
Delayed Time

As a physical carrier, blasting vibration signal includes much information about blasting method, explosive charge structure and propagation medium. Based on the indoor concrete slope test with millisecond blasting and wavelet pocket analysis technology, the blasting seismic signal was analyzed in the features of energy distribution in order to control the blasting vibration hazard better. The attenuation law of the energy and the peak vibration velocity (PPV) with distance decreased were researched. The effects of delayed time interval on PPV and energy are investigated, and the paper have analyzed the weakening degree of energy and PPV of vibration signals when damping ditch exists, so was its effect on the distribution of energy. The conclusions show that: the impact is great about delayed time interval on the total energy of signals in millisecond blasting; the damping ditch made the predominant frequency for energy concentrate on the low frequency band, damping effect of the damping ditch reduced with the delay time interval increasing. When the propagation distance increased, the attenuation trend of the PPV and total energy slowed down gradually near blasting area. The PPV and energy are not necessarily meanwhile the maximum; the energy of the vibration signal is not only determined by the PPV.

scholarly journals A Hybrid Gearbox Fault Diagnosis Method Based on GWO-VMD and DE-KELM

2021 ◽  
Vol 11 (11) ◽  
pp. 4996
Author(s):  
Gang Yao ◽  
Yunce Wang ◽  
Mohamed Benbouzid ◽  
Mourad Ait-Ahmed
Keyword(s):  
Feature Extraction ◽  
Fault Diagnosis ◽  
Vibration Signal ◽  
Optimization Techniques ◽  
Fault Classification ◽  
Vibration Signals ◽  
Kernel Parameter ◽  
Diagnosis Method ◽  
The Impact ◽  
Fault Feature Extraction

In this paper, a vibration signal-based hybrid diagnostic method, including vibration signal adaptive decomposition, vibration signal reconstruction, fault feature extraction, and gearbox fault classification, is proposed to realize fault diagnosis of general gearboxes. The main contribution of the proposed method is the combining of signal processing, machine learning, and optimization techniques to effectively eliminate noise contained in vibration signals and to achieve high diagnostic accuracy. Firstly, in the study of vibration signal preprocessing and fault feature extraction, to reduce the impact of noise and mode mixing problems on the accuracy of fault classification, Variational Mode Decomposition (VMD) was adopted to realize adaptive signal decomposition and Wolf Grey Optimizer (GWO) was applied to optimize parameters of VMD. The correlation coefficient was subsequently used to select highly correlated Intrinsic Mode Functions (IMFs) to reconstruct the vibration signals. With these re-constructed signals, fault features were extracted by calculating their time domain parameters, energies, and permutation entropies. Secondly, in the study of fault classification, Kernel Extreme Learning Machine (KELM) was adopted and Differential Evolutionary (DE) was applied to search its regularization coefficient and kernel parameter to further improve classification accuracy. Finally, gearbox vibration signals in healthy and faulty conditions were obtained and contrast experiences were conducted to validate the effectiveness of the proposed hybrid fault diagnosis method.

Designing for Change: Dynamic Communications Using a Logical Model

1984 ◽  
Vol 28 (1) ◽  
pp. 53-53
Author(s):  
L. D. McMillen ◽  
A. D. Fisk
Keyword(s):  
Human Factors ◽  
Work Environment ◽  
Design Methodology ◽  
System Development ◽  
Working Environment ◽  
Logical Model ◽  
Analysis And Design ◽  
Advantages And Disadvantages ◽  
Workflow Analysis ◽  
The Impact

The Human Factors Engineer is often called upon to perform tasks requiring a substantial amount of interviewing for workflow data gathering. This is certainly the case when a new EDP system is being investigated/restructured or when the manual workflow of an organization is being investigated. The Human Factors objective, in this sort of workflow analysis is to maximize the efficiency of any change and minimize the disruption (during and after the investigation) to the personnel involved. A careful task and workflow analysis must be performed since simply replacing manual tasks with a computer will not necessarily result in efficient workflow or task performance. The analysis must include the entire universe of tasks that are or could be performed in order to determine the information flow, when to remove from or insert the human in the mechanized system loop, etc. The present paper describes a methodology for building what we refer to as a logical model of both the user and system environments. Often, the only certainty facing system designers and Human Factors Engineers is change in the work environment and in the use of the EDP systems supporting that work. It makes sense then to build into the design of the work environment and EDP systems the greatest flexibility and modularity possible. The present paper describes how, by using the proposed logical model methodology, the Human Factors Engineer becomes the “agent of change” on any development team. The improved analysis and design methodology contains five major activity steps which lead to the creation of a working logical model. These activity steps are: 1) Identification of the working environment; 2) Establishment of the organization and system scope: 3) Development of a functional hierarchy; 4) creation of work and data flows; and 5) Documentation of each identified work and system module. Each step is illustrated and described in detail in the paper. Also, how each step, by its and in coordination with the other steps, is used to build the working logical model is discussed. The paper describes the methodology in an instructive manner. Drawing from experience gained by utilizing the methodology, the advantages and disadvantages are highlighted. Any design methodology, however useful, is dependent on the willingness and commitment of all team members to implement it. The steps taken to gain broad acceptance of the methodology are discussed within the paper. In essence, the logical model can be used by the Human Factors Engineer as a dynamic communication device providing two way communication between designers, implementors, and user organizations. As design options in system development become available the Human Factors Engineer can demonstrate the impact of the options. Also, newly discovered user requirements can be added to the model and communicated to the designers.

Food Safety Security: A new Concept for Enhancing Food Safety Measures

2012 ◽  
Vol 82 (3) ◽  
pp. 216-222 ◽  
Author(s):  
Venkatesh Iyengar ◽  
Ibrahim Elmadfa
Keyword(s):  
Food Safety ◽  
Hazard Analysis ◽  
Warning System ◽  
Shared Responsibility ◽  
Fine Tuning ◽  
Strategic Action ◽  
Surveillance Network ◽  
Measurement Systems ◽  
Critical Control Points ◽  
The Impact

The food safety security (FSS) concept is perceived as an early warning system for minimizing food safety (FS) breaches, and it functions in conjunction with existing FS measures. Essentially, the function of FS and FSS measures can be visualized in two parts: (i) the FS preventive measures as actions taken at the stem level, and (ii) the FSS interventions as actions taken at the root level, to enhance the impact of the implemented safety steps. In practice, along with FS, FSS also draws its support from (i) legislative directives and regulatory measures for enforcing verifiable, timely, and effective compliance; (ii) measurement systems in place for sustained quality assurance; and (iii) shared responsibility to ensure cohesion among all the stakeholders namely, policy makers, regulators, food producers, processors and distributors, and consumers. However, the functional framework of FSS differs from that of FS by way of: (i) retooling the vulnerable segments of the preventive features of existing FS measures; (ii) fine-tuning response systems to efficiently preempt the FS breaches; (iii) building a long-term nutrient and toxicant surveillance network based on validated measurement systems functioning in real time; (iv) focusing on crisp, clear, and correct communication that resonates among all the stakeholders; and (v) developing inter-disciplinary human resources to meet ever-increasing FS challenges. Important determinants of FSS include: (i) strengthening international dialogue for refining regulatory reforms and addressing emerging risks; (ii) developing innovative and strategic action points for intervention {in addition to Hazard Analysis and Critical Control Points (HACCP) procedures]; and (iii) introducing additional science-based tools such as metrology-based measurement systems.

The Impact of Internal Work Environment on the Retention of Healthcare Providers at Turaif General Hospital

2019 ◽  
Vol 10 (12) ◽  
pp. 1183-1199
Author(s):  
Mohammed Alrouili ◽  
Keyword(s):  
Work Environment ◽  
General Hospital ◽  
Professional Growth ◽  
Healthcare Providers ◽  
Entire Study ◽  
Internal Work ◽  
Research Findings ◽  
Study Population ◽  
The Right ◽  
The Impact

This study attempted to identify the impact of internal work environment on the retention of healthcare providers at Turaif General Hospital in the Kingdom of Saudi Arabia. In particular, the study aimed to identify the dimensions of work circumstances, compensation, and relationship with colleagues, professional growth, and the level of healthcare providers’ retention. In order to achieve the study goals, the researcher used the descriptive analytical approach. The researcher used the questionnaire as the study tool. The study population comprised all the healthcare providers at Turaif General Hospital. Questionnaires were distributed to the entire study sample that consisted of 220 individuals. The number of questionnaires valid for study was 183 questionnaires. The research findings were as follows: the participants’ estimate of the work circumstances dimension was high (3.64), the participants’ estimate of the compensation dimension was moderate (3.32), the participants’ estimate of the relationship with colleagues dimension was high (3.62), the participants’ estimate of the professional growth dimension was weak (2.39), and the participants’ estimate of healthcare providers’ retention level was intermediate (2.75). Accordingly, the researcher’s major recommendations are: the need to create the right atmosphere for personnel in hospitals, the interest of the hospital to provide the appropriate conditions for the staff in terms of the physical and moral aspects for building the work adjustment in the staff, and conducting training courses and educational lectures for personnel in hospitals on how to cope with the work pressures.

The impact of reflective writing paper on non-English major learners’ autonomy in the context of Vietnam

2013 ◽  
Vol 17 (1-2) ◽  
pp. 104-128
Author(s):  
Phan Thi Tuyet Van
Keyword(s):  
Teaching Methods ◽  
Reflective Writing ◽  
Research Results ◽  
English Major ◽  
Study Process ◽  
The Impact ◽  
Process Journal

The article aims to investigate the impact of the reflective writing paper on non- English major learners’ learning autonomy in a Vietnamese context. The data was collected by means of questionnaire, competence tests and interviews. The participants did two reflective writing papers as an intervention during the research. The research results show the possibilities for teachers to modify their teaching methods through analysis of feedback from the subjects. The findings showed that most participants appreciated the role of the reflective writing paper and they were aware of the significance of learning autonomy in their study process. Journal of NELTA, Vol. 17 No. 1-2, December 2012, Page 104-128 DOI: http://dx.doi.org/10.3126/nelta.v17i1-2.8102

Scale Development: Measuring Job-Family Incivility

2019 ◽  
pp. 31-48
Author(s):  
W G S Mahalekamge ◽  
Nilakshi W K Galahitiyawe
Keyword(s):  
Scale Development ◽  
Work Environment ◽  
Development Process ◽  
Workplace Incivility ◽  
Dynamic Processes ◽  
Validity And Reliability ◽  
Development Approach ◽  
The Impact ◽  
Compound Effect

The main contribution of this paper is the development of the job-family incivility scale. This paper seeks to explore the complex inter-relationships between workplace incivility and family incivility dimensions of job-family incivility by examining the dynamic processes by which job-family incivility is initiated and sustained using a scale development approach. In doing so, the paper highlights the absence of valid and reliable measures that estimate the compound effect of workplace incivility and family incivility – referred to as job-family incivility. A scale development process introduced by Quazi et al. (2016) is presented and stages in the construction of the scale are discussed including measures of validity and reliability. The findings of the study demonstrate the validity and reliability of the job-family incivility scale developed by the current researchers. The main aims of this research are to emphasize the impact of workplace incivility and family incivility on the employees in the work environment, and to discuss the techniques that can be used to mitigate such detrimental activities.

Sign in / Sign up

Export Citation Format

Share Document