scholarly journals Numerical and Experimental UAV Structure Investigation by Pre-Flight Load Test

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3014 ◽  
Author(s):  
Artur Kurnyta ◽  
Wojciech Zielinski ◽  
Piotr Reymer ◽  
Krzysztof Dragan ◽  
Michal Dziendzikowski
Keyword(s):  
Computer Aided Design ◽  
Flight Test ◽  
Load Test ◽  
Load Spectrum ◽  
Static Test ◽  
Multi Stage ◽  
Post Test ◽  
Cad Modelling ◽  
Ground Test ◽  
Load Tests

This paper presents the preparation and execution of on-ground static and engine load tests for the composite unmanned aerial vehicle (UAV). The test was conducted for pre-flight structural strength verification of the remotely piloted aerial target named HORNET, after introducing some structural modifications. The ground tests were performed before the flight test campaign, to ensure the strength and operational safety of the modified structure. The panel method and Computer Aided Design (CAD) modelling were adopted for numerical evaluation of aerodynamic and inertial forces’ distribution to simulate loading scenarios for launch, flight and parachute deploying conditions during the static test. Then, the multi-stage airframe static test was prepared and executed with the use of a designed modular test rig, artificial masses, as well as a wireless strain measurement system to perform structure verification. The UAV was investigated with 150% of the typical load spectrum. Furthermore, an engine test was also conducted on a ground test stand to verify strain and vibration levels in correspondence to engine speed, as well as the reliability of data link and the lack of its interferences with wireless control and telemetry. In the article, data achieved from the numerical and experimental parts of the test are discussed, as well as post-test remarks are given.

scholarly journals Features of static pile load test

2021 ◽  
Vol 134 (1) ◽  
pp. 30-38
Author(s):  
A. Tulebekova ◽  
◽  
A. Zhussupbekov ◽  
Ye. Ashkey ◽  
A. Zhankina ◽  
...  
Keyword(s):  
Load Test ◽  
Capital City ◽  
Engineering Practice ◽  
Foundation Soil ◽  
Static Test ◽  
High Rise ◽  
Geological Conditions ◽  
Load Tests ◽  
Pile Load Tests ◽  
Compressible Soil

Pile foundations are commonly used in engineering practice to transfer the loads from heavy structures such as high-rise buildings to competent soil strata. In this manner, such complications as unfavorable geological conditions, compressible soil layers, and high levels of groundwater are avoided. Different types of piles are used in construction work. The specific type of pile used depends on the type of loading, the foundation soil, and the location of the groundwater table. The technical progress of large, bored piles and the continuous improvements of construction procedures and piling equipment today have created new possibilities. This paper describes a series of pile load tests that were performed in the capital city of Nur-Sultan, Kazakhstan. The control equipment, technological features are important for detailed information about the process of testing and the associated results make them more accurate and reliable. Keywords: pile, static test, load, equipment, soil

scholarly journals Experimental Study of the Modulus of Deformation Determined by Static and Dynamic Plate Load Tests

2020 ◽  
Vol 15 (4) ◽  
pp. 109-124
Author(s):  
Sirko Lehmann ◽  
Steffen Leppla ◽  
Arnoldas Norkus
Keyword(s):  
Dynamic Modulus ◽  
Dynamic Test ◽  
Test Methods ◽  
Load Test ◽  
Design Parameters ◽  
Engineering Practice ◽  
Plate Load Test ◽  
Static Test ◽  
Modulus Of Deformation ◽  
Load Tests

Soil, or soil structure modulus of deformation, is one of the main design parameters for road engineering and traffic infrastructure design of, for example, highways, railways, runways and embankments. It is also the main soil improvement criterion. When creating any road structure with codified design resistance, one employs structural layers of certain thicknesses and modulus of deformation. Both values need to satisfy the minimum values in accordance with codified requirements. This paper analyzes correlations for the widely applied in engineering practice methods to determine the soil stiffness. The static test methods acknowledged to be exact enough for determining the modulus of deformation for the primary and secondary loadings. As dynamic test methods require significantly less time and financial resources, they are widely accepted in engineering practice. The dynamic methods determine only the dynamic modulus of deformation. Design practice aims to relate it with the static modulus of deformation of the secondary loading. Many countries propose codified correlations, with differing levels of conservatism, to convert the dynamic modulus of deformation into the static one. Developed correlations between the results of the static plate load test and the dynamic plate load tests processed from own test results of different soils are presented and a comparative analysis with other proposed correlations is given.

scholarly journals Static pile capacity from the rapid test via the unloading-point method

2021 ◽  
Vol 63 (2) ◽  
Author(s):  
I Luker
Keyword(s):  
Rapid Test ◽  
Liquid Limit ◽  
Point Method ◽  
Load Test ◽  
Shear Stresses ◽  
Test Results ◽  
Pile Capacity ◽  
Static Test ◽  
Rapid Tests ◽  
Load Tests

ABSTRACT Laboratory measurements were done of the end-bearing and side-shear stresses on small piles subjected to "static" and rapid load tests. Interpretation, by the unloading-point method, of the results of rapid tests were done to estimate what the behaviour under a static test would have been if it had been done instead. Comparisons were made of the estimated static test behaviour to the actual static test behaviour to determine empirical values of a factor to adjust estimates closer to actual static test results. The dependence of the empirical factor on soil type, the liquid limit of plastic soils and water content is shown. Keywords: piles, load test, clays, dynamics, empiricism

scholarly journals MS7001F Prototype Test Results

1989 ◽  
Author(s):  
D. E. Brandt
Keyword(s):  
Gas Turbine ◽  
Pressure Ratio ◽  
Load Test ◽  
Test Results ◽  
Critical Temperatures ◽  
Prototype Test ◽  
Surge Margin ◽  
Pertinent Data ◽  
Post Test ◽  
Heavy Duty Gas Turbine

The MS7001F heavy–duty gas turbine has been designed utilizing advanced analytical methods and a substantial array of component tests. The integrity of the system required that the prototype unit, with its accessories, be rigorously tested under load. The factory load test was completed on May 18, 1988 after 387 hours and 134 start/stop cycles. The MS7001F prototype gas turbine was instrumented with more than 3000 pieces of instrumentation in order to record all critical temperatures, pressures, flows, strains, displacements, and other pertinent data. The load device was a modified MS7001E compressor, which also supplied the means by which the MS7001F prototype compressor’s pressure ratio was increased to provide for surge margin determination. Inlet throttling of the MS7001F compressor allowed for full firing temperature operation, at reduced load. The results of this factory prototype load test are reported in the paper as are observations made during post test teardown.

Development and Validation of an On-Wing Engine Thrust Measurement System

2017 ◽  
Author(s):  
Marc Bauer ◽  
Jens Friedrichs ◽  
Detlev Wulff ◽  
Christian Werner-Spatz
Keyword(s):  
Measurement System ◽  
Standard Procedure ◽  
Flight Test ◽  
Engine Thrust ◽  
Thrust Measurement ◽  
Ground Test ◽  
Engine Maintenance ◽  
The Cost ◽  
Development And Validation ◽  
Engine Condition

Maintenance on aircraft engines is usually performed on an on-condition basis. Monitoring the engine condition during operation is an important prerequisite to provide efficient maintenance. Engine Condition Monitoring (ECM) has thus become a standard procedure during operation. One of the most important parameters, the engine thrust, is not directly measured, however, and can therefore not be monitored, which makes it difficult to distinguish whether deteriorating trends e.g. in fuel comsumption must be attributed to the engine (e.g. due to thermodynamic wear) or to the aircraft (e.g. due to increased drag). Being able to make this distinction would improve troubleshooting and maintenance planning and thus help to reduce the cost of ownership of an aircraft. As part of the research project APOSEM (Advanced Prediction of Severity effects on Engine Maintenance), Lufthansa Technik (LHT) and the Institute of Jet Propulsion and Turbomachinery of Technische Universität Braunschweig develop a method for direct measurement of engine thrust during the operation. In this paper, the design process of the On-Wing (OW) Measurement System is presented, including the validation in labratory tests, the mechanical and thermal calibration as well as the final ground test during an engine test run at LHT test cell and the work on the flight test certification.

scholarly journals PENGARUH TERAPI FAMILY PSYCHOEDUCATION (FPE) TERHADAP KECEMASAN DAN BEBAN KELUARGA DALAM MERAWAT ANGGOTA KELUARGA DENGAN SKIZOFRENIA DI KECAMATAN BOLA KABUPATEN SIKKA, NUSA TENGGARA TIMUR

2017 ◽  
Vol 3 (2) ◽  
Author(s):  
Adelheid Riswanti Herminsih ◽  
Wisnu Barlianto ◽  
Rinik Eko Kapti
Keyword(s):  
Disease Process ◽  
T Test ◽  
Load Test ◽  
Family Burden ◽  
Control Group ◽  
Family Psychoeducation ◽  
Significant Difference ◽  
Post Test ◽  
And Control ◽  
Quasi Experiment

Abstract : Schizophrenia is a disease process that affects perceptions, emotions, social behavior and the ability to accept reality correctly. Families with schizophrenics often feel anxiety and burdens associated with client care. The problem can be solved by giving FPE therapy. This study aims to explain the effect of Family Psychoeducation (FPE) therapy on anxiety and family burden in caring for family members with schizophrenia. This research uses quasi experiment research pre-post test with control group. The number of respondents in this study were 18 respondents for the control group and 18 respondents for the treatment group. The study was conducted in District Bola from 24 May to 28 June 2017. Giving therapy done by the researchers themselves who have obtained a license from nurse specializing in mental health nursing. Data analysis used in this research is dependent t test and independent t test. The result of dependent t test of anxiety and load test was obtained significance value <0,05, this result showed significant decrease of anxiety and load after FPE therapy. While the results of independent t test showed that the significance of anxiety and family burden <0.05 which means that there is a significant difference in reducing anxiety and family burden between the treatment and control group after being given FPE therapy, that is, with an average decrease in anxiety and burden For the treatment and control groups of 10.11 and 3.5, respectively. This means that FPE is more effective in reducing family anxiety. Thus it is expected that FPE can be applied as an alternative therapy in reducing the anxiety of families who care for people with schizophrenia.Keywords : family psychoeducation,  anxiety, family burden Abstrak : Skizofrenia merupakan proses penyakit yang mempengaruhi persepsi, emosi, perilaku sosial dan kemampuan menerima realita dengan benar. Keluarga dengan penderita skizofrenia seringkali merasakan kecemasan dan beban yang berkaitan dengan perawatan klien. Masalah tersebut dapat diatasi dengan pemberian terapi FPE. Penlitian ini bertujuan menjelaskan pengaruh terapi Family Psychoeducation (FPE) terhadap kecemasan dan beban keluarga dalam merawat anggota keluarga dengan skizofrenia. Penelitian ini menggunakan desain penelitian quasi experiment pre-post test with control group. Jumlah responden dalam penelitian ini 18 responden untuk kelompok kontrol dan 18 responden untuk kelompok perlakuan. Penelitian dilakukan di Kecamatan Bola mulai tanggal 24 Mei-28 Juni 2017. Pemberian terapi dilakukan oleh peneliti sendiri yang telah mendapatkan lisensi dari perawat spesialis jiwa. Analisis data yang digunakan dalam penelitian ini adalah dependent t test dan independen t test. Hasil analisis dependent t test kecemasan dan beban didapatkan nilai signifikansi< 0,05, hasil ini menunjukkan penurunan kecemasan dan beban secara bermakna setelah diberikan terapi FPE. Sedangkan hasil analisis independent t test menunjukkan bahwa nilai signifikansi kecemasan dan beban keluarga < 0,05 yang berarti bahwa ada perbedaan yang bermakna dalam menurunkan kecemasan dan beban kelurga antara kelompok perlakuan dan kontrol setelah diberikan terapi FPE, yaitu dengan rata-rata penurunan kecemasan dan beban untuk kelompok perlakuan dan kontrol masing-masing yakni 10,11 dan 3,5. Hal ini berarti bahwa FPE lebih efektif dalam menurunkan kecemasan keluarga. Dengan demikian diharapkan bahwa FPE bisa diaplikasikan sebagai alternative terapi dalam menurunkan kecemasan keluarga yang merawat penderita skizofrenia.Kata Kunci : family psychoeducation, kecemasan, beban keluarga

Reliability Evaluation and Study of Static and Dynamic Load Tests of Long Span Continuous Bridge with Variable Section

2011 ◽  
Vol 374-377 ◽  
pp. 2411-2420
Author(s):  
Sui Tan ◽  
Zhi Wu Yu ◽  
Hua Shuai Zhang
Keyword(s):  
Evaluation Method ◽  
Concrete Strength ◽  
Dynamic Test ◽  
Reliability Evaluation ◽  
Scientific Basis ◽  
Static Test ◽  
Long Span ◽  
Variable Section ◽  
Load Tests ◽  
Relationship Of

The reliability evaluation for the bridge in service can provide a scientific basis for decision-making in bridge repair and reinforcement. A comprehensive method for reliability evaluation was introduced in this paper based on a long span continuous bridge with variable section evaluation. Appearance survey of the bridge, concrete strength and carbonization test, static test and dynamic test would be done as well as the finite element simulation model to determine the properties of the bridge for reliability evaluation. The relationship of the natural frequency stiffness evaluation method and the effective coefficient method would be established in this paper based on the test results. Based on the static and dynamic test, we classify the bridge as class 3 while the bending stiffness is good, the dynamic rigidity is a little weak, and the damping coefficient a little larger.

Predicting the Ultimate Bearing Capacity of Single Piles Based on CPTU

2011 ◽  
Vol 243-249 ◽  
pp. 4402-4407
Author(s):  
Yong Hong Miao ◽  
Guo Jun Cai ◽  
Song Yu Liu
Keyword(s):  
Load Test ◽  
Load Testing ◽  
Pile Capacity ◽  
Piezocone Penetration Test ◽  
Load Carrying ◽  
Load Tests ◽  
Pile Load Test ◽  
Single Piles ◽  
Pile Load Tests ◽  
Best Fit

Six methods to determine axial pile capacity directly based on piezocone penetration test (CPTU) data are presented and evaluated. Analyses and evaluation were conducted on three types piles that were failed during pile load testing. The CPT methods, as well as the CPTU methods, were used to estimate the load carrying capacities of the investigated piles (Qp ). Pile load test were used to determine the measured load carrying capacities (Qm). The pile capacities determined using the different methods were compared with the measured pile capacities obtained from the pile load tests. Two criteria were selected as bases of evaluation: the best fit line for Qp versus Qm and the arithmetic mean and standard deviation for the ratio Qp /Qm. Results of the analyses showed that the best methods for determining pile capacity are the CPTU methods.

Rotating bending load tests of wheels. Methodological errors

Trudy NAMI ◽  
2021 ◽  
pp. 25-33
Author(s):  
V. G. Chelnokov ◽  
B. V. Savel'ev
Keyword(s):  
Research Methods ◽  
High Speed ◽  
Load Test ◽  
Practical Significance ◽  
Speed Test ◽  
Bending Load ◽  
Methodological Errors ◽  
Load Tests ◽  
Rotating Bending ◽  
Design Characteristics

Introduction (problem statement and relevance). Wheels are components that ensure the safety of vehicles. One of the main ways to test the fatigue strength of wheels is a rotating bending load test. The methodology of these tests, regulated by international and national regulatory documents, allows an indirect method for measuring the normalized force effect on the wheels, in which there are always risks of methodological errors.The purpose of the study was to identify potential sources of methodological errors when testing wheels in the bending-rotating mode.Methodology and research methods. Analytical research methods from the field of practical vibration theory were used in the article, considering the critical state of rotating shafts and rotors. Scientific novelty and results. The sources of potential methodological errors and their relationship with the design characteristics of the bench equipment and the wheel itself were determined.Practical significance. Practical recommendations have been given on the change and control of the stand components design characteristics aimed at minimizing errors. The high-speed test modes were determined, in which the error of the test effect on the wheel did not go beyond the normative limits.

scholarly journals First results of pipe pile static load test in small laboratory scale

2018 ◽  
Vol 251 ◽  
pp. 04038 ◽  
Author(s):  
Michal Baca ◽  
Jaroslaw Rybak
Keyword(s):  
Static Load ◽  
Axial Loading ◽  
Laboratory Scale ◽  
Load Test ◽  
Scale Model ◽  
Small Scale ◽  
Small Laboratory ◽  
Static Load Test ◽  
First Results ◽  
Load Tests

Presented laboratory testing program of tubular steel piles is a part of a bigger research program which contained static load tests in full scale and numerical simulations of conducted research. The main goal of the research is to compare static load tests with different working conditions of a shaft. The presented small scale model tests are the last part of the research. The paper contains the testing methodology description and first results of model pile axial loading. The static load tests in a small laboratory scale were conducted in a container filled with uniformly compacted medium sand (MSa). The first results of the investigation are presented in this paper, with the comparison of two pile capacities obtained for different roughness of the pile shaft (skin friction). The results are presented as load-displacement curves obtained by means of the Brinch-Hansen 80% method.

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