Inductive Estimation Arithmetic for Random Vibration Data

2011 ◽  
Vol 219-220 ◽  
pp. 1113-1116
Author(s):  
Yong Jie Zhang ◽  
Xiao Hu Zhang ◽  
Bin Tuan Wang
Keyword(s):  
Data Processing ◽  
Numerical Experiments ◽  
Random Vibration ◽  
Measured Data ◽  
Reliability Test ◽  
Vibration Data ◽  
Inductive Methods

The vibration data processing of environmental spectrum is an important part of environmental reliability test for the aircraft. Based on the inductive methods for environmental measured data of vibration, an inductive arithmetic is employed to estimate the random vibration data of aircraft surface in Matlab system. Numerical experiments show that the inductive estimation arithmetic is effective, reliable and applicable for the environmental measured data of random vibration.

Modeling Realistic Environmental Stresses on External Stores

1985 ◽  
Vol 28 (5) ◽  
pp. 26-33
Author(s):  
Hilary Allen
Keyword(s):  
Random Vibration ◽  
Cost Effective ◽  
Environmental Stresses ◽  
Measured Data ◽  
Statistical Analyses ◽  
Qualification Test ◽  
Free Flight ◽  
Flight Data ◽  
Vibration Data ◽  
Environmental Vibration

This paper presents a method for achieving realism required by recent DoD tailoring documents. Use of this approach can be cost-effective for modeling realistic external-store environmental vibration stresses, where no measured data is available. The emphasis presented herein is in tailoring vibration levels to actual mission-defined captive and free-flight profiles. This approach uses a "maximum predicted environment" derived from the statistical analyses of 1839 random vibration flight data measurements made on six different external stores. The basic vibration data used in these analyses were measured on six different host aircraft under a wide variety of captive flight conditions. In comparison, the MIL-STD-810D calculated qualification test requirement for an aft-half, MER cluster, air-to-air missile, produced a required testing level greater than twice the maximum predicted environment (overall grms level) for an equivalent missile.

Boundary Element Method Used in Random Response Calculation of the Plate-Beam Structure

1991 ◽  
Author(s):  
J. M. Zhu ◽  
L. Huang
Keyword(s):  
Boundary Element Method ◽  
Numerical Method ◽  
Boundary Element ◽  
Pressure Fluctuation ◽  
Random Vibration ◽  
Power Plants ◽  
Measured Data ◽  
Random Response ◽  
Beam Structure ◽  
Element Method

Abstract The furnace walls of the large boilers in power plants are combined structures consisting of orthotopic plate and equally spaced beams, which are usually submitted to random vibration under the excitation of the pressure fluctuation induced by combustion in the furnace. In this paper, a numerical method based on BEM to compute the random response of the structure is offered. The agreement between the computing results and the measured data in a practical example verifies the effectiveness of the method.

Regularization by Denoising for simultaneous source separation

Geophysics ◽  
2021 ◽  
pp. 1-56
Author(s):  
Breno Bahia ◽  
Rongzhi Lin ◽  
Mauricio Sacchi
Keyword(s):  
Inverse Problem ◽  
Inverse Problems ◽  
Data Processing ◽  
Spectrum Analysis ◽  
Numerical Experiments ◽  
Source Separation ◽  
Singular Spectrum Analysis ◽  
Source Data ◽  
Blended Data ◽  
Simultaneous Source

Denoisers can help solve inverse problems via a recently proposed framework known as regularization by denoising (RED). The RED approach defines the regularization term of the inverse problem via explicit denoising engines. Simultaneous source separation techniques, being themselves a combination of inversion and denoising methods, provide a formidable field to explore RED. We investigate the applicability of RED to simultaneous-source data processing and introduce a deblending algorithm named REDeblending (RDB). The formulation permits developing deblending algorithms where the user can select any denoising engine that satisfies RED conditions. Two popular denoisers are tested, but the method is not limited to them: frequency-wavenumber thresholding and singular spectrum analysis. We offer numerical blended data examples to showcase the performance of RDB via numerical experiments.

scholarly journals Vibration Data Processing for Bedload Monitoring in Underwater Environments

2020 ◽  
Vol 12 (17) ◽  
pp. 2797
Author(s):  
Gabriel Vasile
Keyword(s):  
Data Processing ◽  
Total Energy ◽  
Steel Plate ◽  
A Priori ◽  
A Priori Knowledge ◽  
Vibration Spectra ◽  
Vibration Data ◽  
Accurate Localization ◽  
Set Up ◽  
Processing Framework

This paper proposes a novel data processing framework dedicated to bedload monitoring in underwater environments. After calibration, by integration the of total energy in the nominal bandwidth, the proposed experimental set-up is able to accurately measure the mass of individual sediments hitting the steel plate. This requires a priori knowledge of the vibration transients in order to match a predefined dictionary. Based on unsupervised hierarchical agglomeration of complex vibration spectra, the proposed algorithms allow accurate localization of the transients corresponding to the shocks created by sediment impacts on a steel plate.

Effect of Higher-Than-Rated-Speed Rotordynamic Modes on Rotor Balancing

2015 ◽  
Author(s):  
John J. Yu ◽  
Siddharth Ashar
Keyword(s):  
Critical Speed ◽  
Measured Data ◽  
Vibration Response ◽  
Vibration Level ◽  
Generator Rotor ◽  
Vibration Data ◽  
Unbalance Response ◽  
Nodal Points ◽  
Rotor Balancing

It was surprisingly reported that a generator rotor could not be balanced to an acceptable vibration level by weights at two balance planes at the drive end (DE) and the non-drive end (NDE) fan rings. Both real measured vibration data and rotordynamic calculations indicate that the rotor at rated speed of 3600 rpm appears to run just above the 2nd critical speed (couple or conical mode). However, couple weights (same weights placed at both DE and NDE with 180-degree-out-of-phase) have little effect on 1X vibration response. A third balance plane had to be utilized to effectively reduce vibration. This paper uses measured data and rotordynamic modelling to explain these findings. It is found that the 4th mode could affect synchronous vibration response at rated speed significantly besides the 3rd mode. The two fan ring balance planes appear to be near the nodal points of the 4th mode, which explains ineffectiveness of the couple weights to vibration response at rated speed in the field. Measured data from real machines including influence vectors are presented from third balance planes such as the coupling and the exciter ends, besides the fan ring wheels. The 3rd and 4th rotordynamic modes are also given along with unbalance response studies.

scholarly journals Pengaruh Pelatihan Kerja Terhadap Kinerja Karyawan Pada PT. Penerbit Erlangga Cabang Samarinda

2020 ◽  
Vol 1 (2) ◽  
Author(s):  
Muhtar Sehe ◽  
Syachrul Syachrul ◽  
Zalfiani Zalfiani
Keyword(s):  
Linear Regression ◽  
Data Processing ◽  
Job Training ◽  
Employee Performance ◽  
Hypothesis Test ◽  
Reliability Test ◽  
Simple Linear Regression ◽  
Validity Test ◽  
Normality Test ◽  
Professional Resources

Employee performance is the results achieved and the achievements shown by employees that help the company achieve the goals it sets. One way that can be done to print these professional resources is to conduct or include employees in a training. This study aims to analyze the effect of job training on employee performance at PT. Publisher Erlangga Branch Samarinda. Data processing in this study used SPSS 17 for windows software, while for testing using a questionnaire in the validity test and reliability test before the study. The classic assumption test used is the normality test. The hypothesis test used is simple linear regression. After analyzing the data obtained from the respondents, the researcher concludes that job training has an effect on employee performance at PT. Erlangga Publisher, Samarinda Branch.

scholarly journals The Effect of Highway Vibration to The Hills Slope Stability by an Integrated GPS-Vibration Data Processing

2019 ◽  
Vol 94 ◽  
pp. 01017
Author(s):  
Achmad Ruchlihadiana Tisnasendjaja ◽  
Hasanuddin Z. Abidin ◽  
Dina A. Sarsito ◽  
Imam A. Sadisun ◽  
Irwan Gumilar
Keyword(s):  
Slope Stability ◽  
Data Processing ◽  
Construction Materials ◽  
Measurement Data ◽  
Road Construction ◽  
Geological Structure ◽  
Vibration Sensor ◽  
Vibration Effect ◽  
Vibration Data ◽  
Object Distance

Bandung-Jakarta, Indonesia highway have high density vehicles pass even often jammed. High activity of vehicles cause repeated vibrations and occur continuously. In case, the highway that divides the hills. The passing vehicles give rise repeatedly vibration and indicated disturbance of hillside slope stability. Vehicles vibration depend on speed, weight, number of vehicles and road construction materials. A method in question is counting a vehicle volume and determine the volume pattern of the vehicle. The magnitude of vibration is function of the object distance from the sources. The magnitude of the vibration effect is very dependent on the geological structure of hills formation. Hilly slope stability indicates experiencing interference if the object or material slope changes position or displacement. GPS observation give position changes and its displacement. The effect of Toll road vibration to slope stability is known by GPS and Vibration simultaneous measurement. Data acquisition used six unit GPS receivers and six unit vibration sensor which is installed on the hillside beside the highway. Integrated data processing techniques using Empirical Mode Decomposition (EMD). Integrated GPS-Vibration data are implemented to find actual displacement which are caused by highway vibration.

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