Model-based transmission acoustic analysis and improvement

2020 ◽  
Vol 234 (6) ◽  
pp. 1572-1584
Author(s):  
Zhan Cao ◽  
Yong Chen ◽  
Libin Zang
Keyword(s):  
Acoustic Analysis ◽  
Transmission Error ◽  
Transmission System ◽  
Excitation Source ◽  
Linear Regression Method ◽  
Model Based ◽  
Assembly Area ◽  
Multiple Variable ◽  
Bearing Assembly ◽  
The Relationship

A model-based transmission acoustic performance has been studied. Both excitation source and structure-borne noise transfer are investigated. For excitation source, transmission error is the main cause. To reduce transmission error, the most effective method is gear micro-geometry modification. However, there is no direct mathematical model that could reveal the relationship between transmission error and gear micro-geometry parameters, especially in the context of transmission system with shafts, bearings and housings included. By using multiple variable linear regression method, the relationship between transmission error and gear micro-geometry parameters is connected. The optimised transmission error decreases from 9.34 to 5.65 μm at a typical working condition. For structure-borne noise transfer, the housing modal and transmission system modal have been analysed. Based on the simulation results, housing thickness around bearing assembly area is increased, and strengthen ribs are added at weak areas. As a result, the amplitude of housing vibration acceleration is reduced. Finally, the transmission noise sound pressure level at 0.3-m distance has decreased by 4.63 dB on average. The presented model-based transmission acoustic analysis work flow is demonstrated workable and effective.

Design System for Composite Transmission Error Prediction for Automatic Transmissions

2004 ◽  
Author(s):  
Sameer Gudal ◽  
Yong Pan ◽  
Shuh-Yuan Liou ◽  
V. Sundararajan ◽  
Daniel Antonetti ◽  
...  
Keyword(s):  
Transmission Error ◽  
Transmission System ◽  
Design System ◽  
Speed Ratio ◽  
Single Pair ◽  
Contributing Factors ◽  
Transmission Errors ◽  
Automatic Transmissions ◽  
The Individual ◽  
The Relationship

Noise in vehicular automatic transmissions is a complex phenomenon involving several interacting factors. One of the contributing factors to noise for a single pair of meshing gears has been shown to be the transmission error. The transmission error (TE) is defined in terms of deviation of the speed ratio from the ideal speed ratio. It has since been hypothesized that the composite transmission error in a planetary system would be the key contributor to noise in automatic transmissions. This composite error would have to include the contributions from individual meshes and account for the configuration of the transmission system. This paper describes a design system that enables engineers to predict and study effects of parameter variation on the composite transmission error. The designer first specifies the configuration of the transmission using canonical graphs. The graph contains the elements such as gears, clutches and brakes of the transmission system as its nodes and the relationship among them for the edges. The design system uses the graph to solve for the speeds and torques. The transmission errors for the individual meshes are computed and then combined into the composite transmission error using a simple average.

PENGARUH PROGRAM PENGEMBANGAN KARIR TERHADAP KINERJA KARYAWAN

2018 ◽  
Vol 14 (1) ◽  
pp. 55-63
Author(s):  
Rizska Julianita
Keyword(s):  
Career Development ◽  
Sampling Method ◽  
Employee Performance ◽  
Hypothesis Test ◽  
Development Program ◽  
T Test ◽  
Linear Regression Method ◽  
Performance Variables ◽  
Career Development Program ◽  
The Relationship

This research is intended to find out how the influence of Career Development on Employee Performance PT Bumi Andalas Permai (BAP) Palembang. In this case the sampling using the Saturated sampling method with the employee population of PT BAP Palembang as many as 78 people. From the results of the questionnaire, processed by using SPSS for Windows version 19 by using simple linear regression method, hypothesis test (t test), and correlation coefficient.Based on the analysis results obtained coefficient (R) of 0.033 which shows the relationship between the two low variables. In the hypothesis test (t test) obtained t count value of -0.285 and t value table 1.991, and significant value 0.777. And when viewed from the probability (sig), career development has a probability value of 0.777. It has also been explained that 0.777> 0.05, then H1 is rejected and H0 is accepted, indicating there is no effect of career development on employee performance. The effect of career development on employee performance can be seen also from the value of regression coefficient (R) 0,001, which shows that the percentage contribution of career development influence to employee performance equal to 0,1%. Can also be interpreted that the variation of career development variables used to explain 0.1% variation of performance variables. The conclusion : career development program does not effect employee performance on PT BAP Palembang.

scholarly journals A Risk-Based Approach to Assess the Operational Resilience of Transmission Grids

2020 ◽  
Vol 10 (14) ◽  
pp. 4761
Author(s):  
Milorad Papic ◽  
Svetlana Ekisheva ◽  
Eduardo Cotilla-Sanchez
Keyword(s):  
Power System ◽  
North American ◽  
Response Times ◽  
Transmission System ◽  
Energy Delivery ◽  
The North ◽  
System Components ◽  
Bulk Power ◽  
Definition Of ◽  
The Relationship

Modern risk analysis studies of the power system increasingly rely on big datasets, either synthesized, simulated, or real utility data. Particularly in the transmission system, outage events have a strong influence on the reliability, resilience, and security of the overall energy delivery infrastructure. In this paper we analyze historical outage data for transmission system components and discuss the implications of nearby overlapping outages with respect to resilience of the power system. We carry out a risk-based assessment using North American Electric Reliability Corporation (NERC) Transmission Availability Data System (TADS) for the North American bulk power system (BPS). We found that the quantification of nearby unscheduled outage clusters would improve the response times for operators to readjust the system and provide better resilience still under the standard definition of N-1 security. Finally, we propose future steps to investigate the relationship between clusters of outages and their electrical proximity, in order to improve operator actions in the operation horizon.

A new underwater positioning model based on average sound speed

2021 ◽  
pp. 1-17
Author(s):  
Yixu Liu ◽  
Xiushan Lu ◽  
Shuqiang Xue ◽  
Shengli Wang
Keyword(s):  
Efficient Algorithm ◽  
Sound Speed ◽  
Incident Angle ◽  
Function Model ◽  
Positioning Accuracy ◽  
Correction Model ◽  
Model Based ◽  
Underwater Positioning ◽  
Speed Function ◽  
The Relationship

Abstract The layout of seafloor datum points is the key to constructing the seafloor geodetic datum network, and a reliable underwater positioning model is the prerequisite for achieving precise deployment of the datum points. The traditional average sound speed positioning model is generally adopted in underwater positioning due to its simple and efficient algorithm, but it is sensitive to incident angle related errors, which lead to unreliable positioning results. Based on the relationship between incident angle and sound speed, the sound speed function model considering the incident angle has been established. Results show that the accuracy of positioning is easily affected by errors related to the incident angle; the new average sound speed correction model based on the incident angle proposed in this paper is used to significantly improve the underwater positioning accuracy.

Effect Analysis of Polarization Aberration in the Non-Line-of-Sight Azimuth Transmission

2021 ◽  
Author(s):  
Zhiyong Yang ◽  
Junchen Song ◽  
Wei Cai ◽  
Danqiu Qiao ◽  
Gaoxiang Lu
Keyword(s):  
Normal Incidence ◽  
Transmission Error ◽  
Transmission System ◽  
Line Of Sight ◽  
Polarization Angle ◽  
Effect Analysis ◽  
Polarized Beam ◽  
Polarization Maintaining ◽  
Selection Of ◽  
Non Line Of Sight

Abstract Focusing on the problem that the polarization aberration caused by the non-normal incidence of the polarized beam affects the accuracy of the azimuth transmission during the fiber coupling process of the non-line-of-sight azimuth transmission system, this paper starts from the principle of non-line-of-sightazimuth transmission. The polarization aberration relation of the lens-fiber combined interface is established based on the Fresnel formulafor the attenuation difference between the horizontal and vertical electric vectors. Further, the azimuth solution model affected by polarization aberration is established. Numerical simulation results show that in non-normal incidence, no polarization aberration will occur when the polarization angle between the incident ray and incident surface is 0° or 90°. Otherwise, the polarization aberration changes toward the incident surface, and the azimuth transmission error will increase with the increase of the polarization aberration. Last, the optimization measures are proposed. This is of great significancefor further improvement of the azimuth transmission system based on polarization-maintaining fibers, the selection of the instrument,and the improvement of the system measurement accuracy.

Vídeo experimental e autorretrato

2021 ◽  
Author(s):  
Filomena Antunes Sobral ◽  
Daniela Morgado Oliveira
Keyword(s):  
Crucial Role ◽  
Point Of View ◽  
The Self ◽  
Self Awareness ◽  
Cindy Sherman ◽  
Artistic Creation ◽  
Multiple Variable ◽  
The Relationship ◽  
Theoretical Foundations ◽  
Creative Production

In the development of the relationship between the artist and his artistic creation, the deconstruction of concepts and ideas within the scope of artistic praxis leads to the reflection of the crucial role that the artist has in the conception and meaning of the work. His creative production, in turn, appropriates not only the expressive force of the author to assert itself as an artistic creation, but can also assume to be the reflection of the self, its identity and materializes in the form of self-portrait. The self-portrait expands the artist’s interiority, externalizing concerns and questions, and conveys a subjective point of view about himself and his view of art. But how does self-portrait contribute to self-awareness? And how does the artist reveal himself and communicate beyond his appearance?Based on these questions, the objective of this paper is to provide a reflection on self-portrait presenting the results of an artistic installation project that involved photographic language in the form of self-portrait and experimental video to represent feelings of disquiet. Influences such as Cindy Sherman, Lais Pontes or Francesca Woodman, whose creations approach the self-portrait in a not only original, but critical style, stand out.It is a project of academic and artistic nature supported by theoretical foundations. The results allow us to conclude that the artistic installation, which began by presenting a self-portraying self-seeking identity, frees itself from its creator to enhance multiple variable interpretations depending on the observer’s attention.

Competing Explanations of Split-ticket Voting in American National Elections

2000 ◽  
Vol 28 (3) ◽  
pp. 379-407 ◽  
Author(s):  
FRANCO MATTEI ◽  
JOHN S. HOWES
Keyword(s):  
Small Group ◽  
National Elections ◽  
Congressional Voting ◽  
Party Polarization ◽  
Model Based ◽  
Alternative Approach ◽  
Candidate Evaluations ◽  
Electoral Expectations ◽  
The Relationship

In this article, the authors propose an extension to Fiorina's balancing model based on voters' electoral expectations and test this extension and several implications of the theory. The authors examine the observed pattern of ticket-splitting and find it less consistent with a balancing perspective than with an alternative approach stressing separation between presidential and congressional voting. They also address the relationship between party polarization and ticket-splitting; their results indicate that the occurrence of split ballots does not increase with polarization. A further test identifies respondents with both the sophistication and the motive to engage in balancing behavior. According to this analysis, balancing considerations influence, at most, the very small group of voters whose sophistication and electoral expectations give them the tools and the incentive to pursue balance with a split ballot. Ticket-splitting appears to result far more from incumbency and cross-pressured voters holding candidate evaluations at odds with their partisan learnings.

On the Correlation Between Dynamic Transmission Error and Dynamic Tooth Loads in Three-Dimensional Gear Systems

2015 ◽  
Author(s):  
Nina Sainte-Marie ◽  
Philippe Velex ◽  
Guillaume Roulois ◽  
Franck Marrot
Keyword(s):  
Experimental Evidence ◽  
Three Dimensional ◽  
Transmission Error ◽  
Test Rig ◽  
Transmission Errors ◽  
Linear Dependency ◽  
Lumped Parameter ◽  
Dynamic Transmission Error ◽  
Time Variations ◽  
The Relationship

A three-dimensional dynamic model is presented to simulate the dynamic behavior of single stage gears by using a combination of classic shaft, lumped parameter and specific 2-node gear elements. The mesh excitation formulation is based on transmission errors whose mathematical grounding is briefly described. The validity of the proposed methodology is assessed by comparison with experimental evidence from a test rig. The model is then employed to analyze the relationship between dynamic transmission errors and dynamic tooth loads or root stresses. It is shown that a linear dependency can be observed between the time variations of dynamic transmission error and tooth loading as long as the system can be assimilated to a torsional system but that this linear relationship tends to disappear when the influence of bending cannot be neglected.

scholarly journals HUBUNGAN GAYA KEPEMIMPINAN TERHADAP PRODUKTIVITAS KERJA KARYAWAN BAGIAN LIQUID PT ITRASAL YANG DIMEDIASI OLEH MOTIVASI KERJA

2018 ◽  
Vol 15 (01) ◽  
pp. 51
Author(s):  
Endang Rachmawati
Keyword(s):  
Leadership Style ◽  
Positive Relationship ◽  
Work Motivation ◽  
Primary Data ◽  
Linear Regression Method ◽  
Employee Productivity ◽  
Independent Variable ◽  
R Value ◽  
Relationship Of ◽  
The Relationship

INTISARI    Penelitian ini bertujuan untuk mengidentifikasi hubungan Gaya Kepemimpinan terhadap Produktivitas Karyawan PT. ITRASAL yang dimediasi oleh Motivasi Kerja. Penelitian ini menggunakan rancangan penelitian metode asosiatif dengan jenis penelitian  survey  yang akan mengungkapkan hubungan dua variabel, yaitu Gaya Kepemimpinan sebagai variabel bebas dan Produktivitas sebagai variabel terikat. Data primer berasal dari kuesioner yang disebarkan kepada karyawan bagian Liquid Departemen Produksi PT ITRASAL, dan hasil diskusi dengan karyawan bagian tersebut. Selanjutnya data yang diperoleh dianalisis menggunakan metode korelasi dan regresi linear. Dari penelitian ini diperoleh hasil bahwa nilai r untuk variabel Gaya Kepemimpinan terhadap Produktivitas adalah 0,557 dan nilai t adalah 8.951. Nilai r untuk variabel Gaya Kepemimpinan terhadap Motivasi adalah 0,278 dan nilai t adalah 5,022. Terdapat hubungan positif antara Gaya Kepemimpinan terhadap Produktivitas dan Gaya Kepemimpinan berpengaruh positif terhadap Motivasi. Nilai r untuk variabel Motivasi terhadap Produktivitas adalah 0,377 dan nilai t adalah 6,251. Terdapat hubungan positif antara Motivasi terhadap Produktivitas. Kata kunci : Gaya kepemimpinan, Motivasi kerja, Produktivitas karyawan  ABSTRACT  This study aims to identify the relationship of leadership style to employee productivity PT. ITRASAL is mediated by work motivation. This research uses the research design of associative method with the type of survey research that will reveal the relationship of two variables, namely Leadership Style as independent variable and productivity as dependent variable. Primary data comes from a questionnaire distributed to employees of the Liquid Department of Production Department of PT ITRASAL, and the results of discussions with employees of that section. Further data obtained were analyzed using correlation and linear regression method. From this research, the result that r value for leadership style variable to productivity is 0,557 and t value is 8,951. The r value for the leadership style variable for motivation is 0.278 and the t value is 5.022. There is a positive relationship between leadership style on productivity and leadership style have a positive effect on motivation. The r value for the Motivation variable on productivity is 0.377 and the t value is 6.251. There is a positive relationship between motivation to productivity. Keywords: Leadership style, Motivation work, Employee productivity

scholarly journals Study of the Transmission Error Prediction of a Five-speed Manual Transmission System

2016 ◽  
Vol 15 (2) ◽  
pp. 66-71 ◽  
Author(s):  
Sang-Pil Cho ◽  
Dong-Gyu Lee ◽  
Lae-Sung Kim ◽  
Zhe-zhu Xu ◽  
Sung-ki Lyu
Keyword(s):  
Transmission Error ◽  
Transmission System ◽  
Manual Transmission ◽  
Error Prediction
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