scholarly journals A Flight Test Method of Flammable Liquid Leakage and Discharge for Certain Aircraft

2018 ◽  
Vol 227 ◽  
pp. 01001
Author(s):  
Jiangtao Song ◽  
Yan Zhao ◽  
Yu Li
Keyword(s):  
Flight Test ◽  
Test Methods ◽  
Test Method ◽  
Test Equipment ◽  
Test Results ◽  
Successful Completion ◽  
Flammable Liquid ◽  
Flight Tests ◽  
Civil Aircraft ◽  
Certification Test

To guarantee the successful completion of airworthiness certification test for a certain type of aircraft, the leakage and discharge compliance criteria of flammable liquid were designed by studying airworthiness requirements and the design characteristic of the civil aircraft, where flammable liquid leakage zones and hazardous zones in which liquids are not allowed to enter were determined. Further the test equipments and the dyeing liquor for replacing flammable fluid were developed, and ground and flight test methods were proposed. Moreover, the above test equipment and methods were applied to flight tests of flammable liquid leakage and discharge for certain civil aircraft. The test results show that the test equipment is stable and reliable, and the flight test method can accurately demonstrate the flammable liquid leakage and discharge.

scholarly journals Research on Civil Aircraft Flight Test of Power Supply Quality Analysis

2021 ◽  
Vol 2136 (1) ◽  
pp. 012016
Author(s):  
Jingtao Wu ◽  
Pei Wang ◽  
Jin Cai ◽  
Ying Liu
Keyword(s):  
Power Supply ◽  
Flight Test ◽  
Quality Standard ◽  
Test Method ◽  
Quality Analysis ◽  
Quality Test ◽  
Test Characteristic ◽  
Aircraft Flight ◽  
Civil Aircraft ◽  
Test Requirements

Abstract In the process of civil aircraft airworthiness, analyzing power quality is the key to verify whether the power supply system meets the requirements of the clause. This paper makes deep research on the domestic and foreign power supply quality standard files and detailed introduces the characteristics of the power supply quality standard files. Then, comparative and analysis give suggestions which tally with power supply quality test requirements. Finally, define the special power supply quality test method for the practical engineering specifically, and power supply quality test characteristic in civil aircraft flight test, to provide guidance help for the future civil aircraft models.

Experimental Research on Vibration Characteristics of Laminated Composite Cantilever Beam

2021 ◽  
Author(s):  
Rui Yang ◽  
Xiaobin Li ◽  
Hongxi Li
Keyword(s):  
Cantilever Beam ◽  
Optical Measurement ◽  
Laminated Composite ◽  
Experimental Methods ◽  
Test Methods ◽  
Vibration Characteristics ◽  
Test Method ◽  
Vibration Measurement ◽  
Vibration Test ◽  
Test Results

Abstract In this paper, the vibration characteristics of laminated composite cantilever beam is taken as the research object. Firstly, a vibration formula specific for laminated composite cantilever beam is derived, from which the low order natural frequency of laminated composite cantilever beam is calculated; Secondly, two experimental methods, electrical and optical measurement, are used to study the vibration characteristics of laminated composite cantilever beam, and the influence of different test methods, sensor types, number of measuring points and excitation methods on the test results are analyzed. Through the combination of theory and experiment, a test method that can be applied to the vibration test of composite material laminated structure cantilever beam is obtained. Based on the laser vibration measurement method in the optical method, the results show that the deviation between the experimental data and the theoretical solution is the smallest when the distance between the probe and the specimen is 0.5m and the sampling time is 5s by using the optical fiber vibrometer. The research content of this article can provide a reasonable reference for related vibration test research.

Methods to Evaluate Cleaners and Sanitizers

1982 ◽  
Vol 45 (13) ◽  
pp. 1257-1260 ◽  
Author(s):  
DALE L. SCHEUSNER
Keyword(s):  
Test Methods ◽  
Test Method ◽  
Test Results ◽  
Standard Laboratory ◽  
Test Procedures ◽  
Laboratory Methods ◽  
Product Use ◽  
Cellulose Sponge ◽  
Equivalent Test ◽  
Recovery Methods

Methods to evaluate germicides can be grouped into three categories: standard laboratory tests, in-use tests and simulated-use tests. Standard laboratory methods, such as the Available Chlorine Germicidal Equivalent test, are specifically defined for reproducibility in any laboratory by any operator, but the test results often lack relevance to actual product-use conditions. In-use test methods are relevant to product-use; however, in-use test procedures do not permit proper controls to be included in the organism recovery methods. Contact plates give an estimate of organism numbers which is only 25% of the theoretical number of organisms present. Organism recovery using a swab, cellulose sponge or tube sampler give estimates of organisms ranging from 91 to 111% of theoretical. The tube sampler is a 1-in. length of flexible tubing having a 1-in. interior diameter and a smooth end, which can make a water-tight seal on a flat surface. Simulated use testing yields data which are relevant to actual product-use. A cafeteria tray is soiled, inoculated and cleaned in a manner to simulate actual product-use. This test method permits the necessary controls to be used. Tray-test reproducibility is as good as that of the other recovery methods tested and organism recovery is quantitative. The tray test provides a means for determining biological cleaning where the effect of both cleaning and germicidal activity are measured together.

Dynamic Simulation and Ground Testing of the Autonomous Vertical Air-Launch Sled Concept

2020 ◽  
Author(s):  
Peter Lee ◽  
Nesrin Sarigul-Klijn
Keyword(s):  
Dynamic Response ◽  
Flight Test ◽  
Front Wheel ◽  
Lateral Stability ◽  
Test Results ◽  
Flight Tests ◽  
Ground Testing ◽  
Remotely Piloted Aircraft ◽  
Correct Path ◽  
Measures Of Performance

Abstract A unique towed air-launch concept called the vertical air-launch sled is studied using a 1/32nd scale vehicle. The sled allows a launch vehicle carried by it to be towed to an altitude by a mother aircraft using a standard towline. The focus was to design and test autonomous tow taxi and takeoff phase of flight using simulations and flight tests. In order to study the scaling validity, experimental flight test data was compared to the theoretically predicted dynamic response of the scaled system, as well as compared to a theoretically predicted dynamic response of the full-scale system. The towing aircraft is a 1/11th scale T-28 remotely piloted aircraft. Lateral stability, runway centerline following ability as well as tautness of the tow line are studied as measures of performance of the autonomous system designed. Test results are reported showing that the tow aircraft was able to tow the vehicle along the correct path. It is identified that the rudder servos were saturated in adjusting the trajectory and future flight tests will include implementing front wheel steering into the system to alleviate the rudder servos saturation. Duration of the flight tests will be increased to better evaluate the automatic controller.

scholarly journals Performance characteristics of polymerase chain reaction and histological methods for the detection of Haplosporidium nelsoni in the eastern oyster (Crassostrea virginica)

2015 ◽  
Vol 27 (4) ◽  
pp. 476-488 ◽  
Author(s):  
Nellie Gagné ◽  
Anne Veniot ◽  
Mary Stephenson ◽  
Carol McClure
Keyword(s):  
Polymerase Chain Reaction ◽  
Test Methods ◽  
Test Method ◽  
Performance Characteristics ◽  
Analytical Sensitivity ◽  
Test Results ◽  
Fitness For Purpose ◽  
Chain Reaction ◽  
Repeatability And Reproducibility ◽  
Polymerase Chain

Fitness for purpose and validation are increasingly becoming a benchmark in the development of test methods for the diagnosis of infectious diseases in aquatic animals. The design of the evaluation and the analysis of data are critical to demonstrate test method performance characteristics and fitness for purpose, as stated in the World Organization for Animal Health pathway for test validation. Three test methods for the detection of the oyster parasite Haplosporidium nelsoni were selected for the validation study described herein: histology, end-point polymerase chain reaction (PCR), and real-time PCR (qPCR). Preliminary work evaluated the analytical sensitivity and specificity of the PCR and qPCR assay in development. The following stage used test results on 100 oysters in 3 different laboratories to assess diagnostic sensitivity (DSe), diagnostic specificity (DSp), repeatability, and reproducibility. Repeatability and reproducibility were within 68–95%. The final part of the project evaluated DSe and DSp using test results on 400 oysters and results from the first 100 oysters tested. In the absence of a 100% gold standard test, latent class modeling methods were explored to characterize the tests (i.e., Bayesian analyses). For both PCR methods, DSe was >90%, and in the 60% range for histology, whereas DSp was >90% for all methods. Based on the results of this validation, a threshold cycle value of 30 for qPCR corresponds to the limit of sensitivity for histology where unreliable detection becomes more frequent, thus providing a threshold helpful in diagnostic settings where both histology and qPCR are used.

The Research of Negative Ion Test Method for Fabric

2013 ◽  
Vol 756-759 ◽  
pp. 138-140 ◽  
Author(s):  
Yun Sen Sun ◽  
Bo Qiu ◽  
Qing Shan Li
Keyword(s):  
Influence Factors ◽  
Test Methods ◽  
Test Method ◽  
Ion Concentration ◽  
Negative Ion ◽  
Testing Device ◽  
Test Results ◽  
Influence Of Temperature ◽  
Functional Textiles ◽  
Temperature And Humidity

We developed a device for automatic closed friction and analyzed its test results in this paper, which showed the influence factors in the test methods of textile negative ion occurrence amounts. The textile negative ion occurrence amounts in different time stages were tested in this process; the analysis of its influence of temperature and humidity has certain reference significance for improving testing device for testing textile negative ion concentration, on the basis, functional textiles were also studied. Finally, we put forward the influence factors in the test methods of textile negative ion occurrence amounts.

Transient Methods of Thermal Properties Measurement on Fibrous Materials

2009 ◽  
Vol 132 (3) ◽  
Author(s):  
Zuo Lei ◽  
Sukang Zhu ◽  
Ning Pan
Keyword(s):  
Fibrous Material ◽  
Local Heat ◽  
Test Methods ◽  
Test Method ◽  
Dual Phase ◽  
Fibrous Materials ◽  
Test Results ◽  
Main Factors ◽  
Transient Methods ◽  
Transfer Properties

Fibrous material is a complex porous medium and steady test methods are the main test approaches we currently depend on to study the heat transfer properties. The application of unsteady test methods on fibrous material is still not mature. In this paper, some systematic studies are taken to investigate this problem. By analyzing the main factors impacting the test results, it is found that the local heat convection potentially excited by imposing test temperature can be avoided by limiting the internal temperature gradient and the so-called dual-phase lagging effects are negligible so that the feasibility of the unsteady test method is verified via both theoretical analysis and experimental data.

scholarly journals THE ESTIMATION PROBLEMS OF THE FIRE HAZARD FOR VERTICALLY ORIENTED BUILDING PRODUCTS/VERTIKALIAI ORIENTUOTŲ STATYBINIŲ GAMINIŲ GAISRINIO PAVOJINGUMO ĮVERTINIMO PROBLEMOS

1999 ◽  
Vol 5 (1) ◽  
pp. 74-78 ◽  
Author(s):  
Albertas Nyderis
Keyword(s):  
Heat Transfer ◽  
Fire Protection ◽  
Fire Test ◽  
Test Methods ◽  
Test Method ◽  
Building Construction ◽  
Research Centre ◽  
Test Results ◽  
Solid Materials ◽  
Building Products

The Directive of new approach 89/106/EEC, which was prepared by Directorate General of the European Commission (DG III), defines the guidelines for development of fire protection in building construction. Six main directions for development of fire protection are defined in this Directive as well. Solid materials are most numerous among building products. Therefore a brief analysis of combustion process of these materials is presented in this article. F.Williams developed the theoretical principles of combustion. Phase transitions in the zone of combustion are analyzed in the theory. Formulas 1–4 describe this process. The process of combustion of solid materials is heterogeneous; therefore the model of pyrolysis is presented by 5 formulas. An intricate energy exchange takes place in real fires. The heat is being transferred in different ways. The most acceptable description of heat transfer is by means of radiation. Description of this process is presented in formulas 6–7. The heat transfer by means of radiation can be modelled and used for environment testing. The combustibility of building products can be examined by means of reaction of fire tests. In recent years tests for different building products were carried out according to ISO 5657 test methodology in the Fire Research Centre. Test results indicate that the time to sustained surface ignition for building products is inversely proportional to heat flux. This logarithmic dependence is presented in 8 formulas. Establishment of parameters of this logarithmic flow for different building products can prove this. This work was carried out during the process of verification of this hypothesis. Analysis of fire testing practice of vertically oriented building products in different countries shows that harmonized fire test methods for these products do not exist. Most of these test methods are based on presumption that the flame spread is possible only inside the building not considering the behaviour of facade in fire. The main idea of fire test method for element of vertically oriented building construction together with the principal scheme of test equipment are presented in the article as well. Further development of this idea leads to five questions, which should be answered to solve the problem. After the completion of this task and analysis of test results, all the information is to be submitted for further consideration.

Collaborative Autonomy for Mapping, Search, and Pursuit

2016 ◽  
Vol 04 (02) ◽  
pp. 167-184
Author(s):  
John G. Mooney ◽  
Stephen Haviland ◽  
Eric N. Johnson
Keyword(s):  
Decision Making ◽  
Flight Test ◽  
Detection Technique ◽  
Test Results ◽  
Flight Tests ◽  
Simulation Tools ◽  
Autonomous Decision ◽  
Location Detection ◽  
Collaborative Autonomy

This paper describes the development and flight tests of a multi-aircraft collaborative architecture, focused on decentralized autonomous decision making to solve a scenario-driven challenge problem. The architecture includes two search coverage algorithms, a hide location detection technique, behavior estimation, and a target manipulation algorithm. The architecture was implemented on a pair of Yamaha RMAX helicopters outfitted with modular avionics, as well as an associated set of simulation tools. Simulation and flight test results for single- and multiple aircraft scenarios are presented. Further work suggested includes identification and development of more sophisticated evader models and pursuit algorithms.

scholarly journals Research on High-Temperature Cooling Flight Test Technology of a Certain Type of Civil Aircraft Generator

2021 ◽  
Vol 2136 (1) ◽  
pp. 012018
Author(s):  
Jingtao Wu ◽  
Jin Cai ◽  
Ming Ma
Keyword(s):  
Data Analysis ◽  
High Temperature ◽  
Flight Test ◽  
Test Subject ◽  
Flight Tests ◽  
Technical Research ◽  
Technical Preparation ◽  
Test Technology ◽  
Civil Aircraft

Abstract The high-temperature special flight test is one of the important special meteorological flight tests for civil aircraft airworthiness certification flight test, and generator high-temperature cooling flight test is also very important as the key flight test subject of high-temperature special flight test. The purpose of this paper is to summarize and study the airworthiness background, technical research, technical preparation, technical implementation, and data analysis results of a certain type of civil aircraft generator high-temperature cooling flight test, to provide guidance and help for subsequent civil aircraft generator high-temperature cooling flight test.

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