Research on test system and technology of wide-range gear transmission characteristics

2021 ◽  
Author(s):  
Peng Xiao ◽  
Jixuan Bian ◽  
Haoliang Lv ◽  
Cheng Wang ◽  
Zeming Lin ◽  
...  
Keyword(s):  
Test System ◽  
Gear Transmission ◽  
Transmission Characteristics ◽  
Wide Range

The Statistical Evaluations of Transmission Characteristics, Limits of Ranges and Speeds of Transmission of Information Via the Pulsed Atmospheric Bistatic Optical Channels

2019 ◽  
pp. 97-104
Author(s):  
Mikhail V. Tarasenkov ◽  
Egor S. Poznakharev ◽  
Vladimir V. Belov
Keyword(s):  
Communication Systems ◽  
Estimation Algorithm ◽  
Transmission Characteristics ◽  
Radiation Beam ◽  
Optical Channels ◽  
The Monte Carlo Method ◽  
Wide Range ◽  
Transmission Of Information ◽  
Optical Axes ◽  
Visibility Range

The simulation program by the Monte Carlo method of pulse reactions of bistatic atmospheric aerosol-gas channels of optical-electronic communication systems (OECS) is created on the basis of the modified double local estimation algorithm. It is used in a series of numerical experiments in order to evaluate statistically the transfer characteristics of these channels depending on the optical characteristics of an atmosphere plane-parallel model for wavelengths λ = 0.3, 0.5, and 0.9 μm at a meteorological visibility range SM = 10 and 50 km. The results are obtained for a set of basic distances between the light source and the light receiver up to 50 km and for the angular orientations of the optical axes of a laser radiation beam and of the receiving system in a wide range of their values. The dependences of the pulse reactions maximum values over-the-horizon channels of the OECS on the variations of these parameters are established.

A Transient Single Cylinder Test System for Engine Research and Control Development

2005 ◽  
Author(s):  
John L. Lahti ◽  
Matthew W. Snyder ◽  
John J. Moskwa
Keyword(s):  
Test System ◽  
Intake Manifold ◽  
Test Accuracy ◽  
Test Configuration ◽  
Single Cylinder ◽  
Cylinder Test ◽  
Single Cylinder Engine ◽  
Wide Range ◽  
Reduce Development Time ◽  
High Bandwidth

A transient test system was developed for a single cylinder research engine that greatly improves test accuracy by allowing the single cylinder to operate as though it were part of a multi-cylinder engine. The system contains two unique test components: a high bandwidth transient hydrostatic dynamometer, and an intake airflow simulator. The high bandwidth dynamometer is used to produce a speed trajectory for the single cylinder engine that is equivalent to that produced by a multi-cylinder engine. The dynamometer has high torque capacity and low inertia allowing it to simulate the speed ripple of a multi-cylinder engine while the single cylinder engine is firing. Hardware in loop models of the drivetrain and other components can be used to test the engine as though it were part of a complete vehicle, allowing standardized emissions tests to be run. The intake airflow simulator is a specialized intake manifold that uses solenoid air valves and a vacuum pump to draw air from the manifold plenum in a manner that simulates flow to other engine cylinders, which are not present in the single cylinder test configuration. By regulating this flow from the intake manifold, the pressure in the manifold and the flow through the induction system are nearly identical to that of the multi-cylinder application. The intake airflow simulator allows the intake runner wave dynamics to be more representative of the intended multi-cylinder application because the appropriate pressure trajectory is maintained in the intake manifold plenum throughout the engine cycle. The system is ideally suited for engine control development because an actual engine cylinder is used along with a test system capable of generating a wide range of transient test conditions. The ability to perform transient tests with a single cylinder engine may open up new areas of research exploring combustion and flow under transient conditions. The system can also be used for testing the engine under conditions such as cylinder deactivation, fuel cut-off, and engine restart. The improved rotational dynamics and improved intake manifold dynamics of the test system allow the single cylinder engine to be used for control development and emissions testing early in the engine development process. This can reduce development time and cost because it allows hardware problems to be identified before building more expensive multi-cylinder engines.

RISK FACTORS FOR REDUCING VITAMIN D SUPPLY IN ADOLESCENTS WITH ARTERIAL HYPERTENSION AND OBESITY

2021 ◽  
Vol 100 (2) ◽  
pp. 187-191
Author(s):  
S.S.K. Zeid ◽  
◽  
L.V. Yakovleva ◽  
Keyword(s):  
Vitamin D ◽  
Arterial Hypertension ◽  
Comparison Group ◽  
Vitamin D Insufficiency ◽  
Test System ◽  
White Coat Hypertension ◽  
Control Group ◽  
Internal Factors ◽  
Wide Range ◽  
Normal Body Weight

The aim of the study is to determine the contribution of external and internal factors, such as the season, body mass index (BMI), age, sex, degree of AH, the formation of insufficiency and/or deficiency of 25 (OH)D in adolescents with arterial hypertension (AH). Materials and methods: the core group consisted of 87 adolescents with primary AH, which then were divided into two subgroups depending on BMI (Subgroup 1 – overweight and obese, Subgroup 2 – with normal body weight). The control group consisted of 23 adolescents with the phenomenon of «white coat hypertension» (WHT). The level of 25(OH)D in the blood serum was determined by immunoextraction with further with further quantitative determination by enzyme immunoassay using StarFax 2100 analyzer (USA). A DIA source Immuno assays S.A. test system. (Belgium) was used. All calculations were carried out according to the instruction in which the norm was 25(OH)D>/=30–100 ng/ml; insufficiency – 10–29 ng/ml; deficiency – > 10 ng/ml. Results: the level of 25(OH)D in peripheral blood fluctuated in a wide range – from 5,1 to 50,2 ng/ml, the median level of 25(OH)D was 17,8 ng/ml [12,2; 23,5]. According to the results of the study, only 4 (3,6%) children had a normal vitamin D level, 95 (86,4%) had vitamin D insufficiency and 11 (10%) had a deficiency. The median values of 25(OH)D in children of the comparison group were statistically significantly higher than in children with AH of the 1st and 2nd subgroups – 23,3 ng/ml [20,8; 26,0], 14,9 ng/ml [10,8; 19,5] and 17,1 ng/ml [11,8; 23,7], respectively, p=0,001. Conclusion: according to the results of the multivariate analysis, 25(OH)D in the observed adolescents depends on many factors, such as age (6,7%), gender differences (5,7%), etc. The seasons have the greatest influence on its level (62,3%) and BMI (21,4%), the least – AH (3,9%).

PERINATAL ASPECTS OF PREGNANCY AND CHILDBIRTH ON THE BACKGROUND OF VITAMIN D LACK IN PREGNANT WOMEN

2021 ◽  
Vol 74 (10) ◽  
pp. 2585-2587
Author(s):  
Vitaliy V. Maliar
Keyword(s):  
Vitamin D ◽  
Blood Serum ◽  
Pregnant Women ◽  
Perinatal Outcomes ◽  
Fetal Distress ◽  
Test System ◽  
Perinatal Complications ◽  
Pregnancy And Childbirth ◽  
Wide Range ◽  
Pregnancy And Delivery

The aim: To study the features of the course of gestation and perinatal outcomes of delivery in women with vitamin D lack. Materials and methods: The article presents the results of studies of the characteristics of the course of pregnancy and delivery outcomes in 50 patients with vitamin D lack compared with a group of 50 somatically healthy pregnant women with normal level of 25 (OH) D. In order to establish a lack of vitamin D in pregnant women in the 10-12, 20-22, 30-32 weeks of gestation electrochemiluminiscence method by using a test system EURIMMUN (Germany) in the blood serum level of 25-hydroxycalciferol (25 (OH) D) in pregnant women. Results: When analyzing the structure of complications in women with vitamin D lack during pregnancy and childbirth we found out that risk of premature birth and premature births dominated among all the complications, respectively (58.0% and 36.0%) against (12.0% and 16.0%), p <0.05. Vitamin D lack in pregnant women is often associated with a wide range of obstetric and perinatal complications, namely: preeclampsia, gestational diabetes, bacterial vaginosis , premature rupture of membranes, placental abruption, abnormal labor activity, fetal distress that required delivery by Caesarean section. Conclusions: An analysis of the course of pregnancy and childbirth in women of thematic groups proved the expediency of an individual approach to the therapy of obstetric pathology among women with vitamin D lack. Despite the level of 25 (OH) D in the blood serum of a pregnant woman of 30 ng / ml and below, it is advisable to prescribe vitamin D for prophylaxes and treatment of Vitamin D deficiency in mother and fetus.

scholarly journals Abrasive Sensitivity of Engineering Polymers and a Bio-Composite under Different Abrasive Conditions

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5239
Author(s):  
Hasan Muhandes ◽  
Ádám Kalácska ◽  
László Székely ◽  
Róbert Keresztes ◽  
Gábor Kalácska
Keyword(s):  
Material Properties ◽  
Regression Models ◽  
Tribological Behavior ◽  
Test System ◽  
Linear Regression Models ◽  
Dimensionless Numbers ◽  
Hemp Fibers ◽  
Wide Range ◽  
Engineering Polymers ◽  
Impact Angles

Two different test systems were designed to evaluate the tribological behavior of five engineering plastics (Polyamide—PA grades and Ultra High Molecular Weight Polyethylene—UHMW-PE) and a fully degradable bio-composite (Polylactic Acid—PLA/hemp fibers) targeted to agricultural machinery abrasive conditions. Pin-on-plate tests were performed with different loads, sliding velocity and abrasive particles. The material response was further investigated in a slurry containing abrasive test system with different sliding velocities and distances, abrasive media compositions and impact angles. The abrasive wear, the change of the 3D surface roughness parameters, the friction force and contact temperature evolution were also analyzed as a function of the materials’ mechanical properties (H,E,σy,σc,εB,σF,σM) and the dimensionless numbers derived from them. Using the IBM SPSS 25 software, multiple linear regression models were used to statistically evaluate the measured data and to examine the sensitivity of the material properties and test system characteristics on the tribological behavior. For both test setups, the system and material characteristics influencing the dependent variables (wear, friction, heat generation) and the dimensionless numbers formed from the material properties were ranked using standardized regression coefficients derived from the regression models. The abrasion sensitivity of the tested materials were evaluated taking into account a wide range of influencing parameters.

A Constitutive Model Research Based on Dislocation Mechanism of 5083 Aluminum Alloy

2017 ◽  
Vol 35 (02) ◽  
pp. 145-152
Author(s):  
N. Gao ◽  
Z. Zhu ◽  
S. Xiao ◽  
Q. Xie
Keyword(s):  
Aluminum Alloy ◽  
Constitutive Model ◽  
Plastic Flow ◽  
Test System ◽  
Dislocation Dynamics ◽  
Strain Rates ◽  
Prediction Ability ◽  
Yield Behavior ◽  
Wide Range ◽  
5083 Aluminum Alloy

ABSTRACTThe study of the mechanical properties of polycrystalline alloy materials under dynamic impact, namely, the prediction of mechanical behavior after yield stress and the establishment of a constitutive model, has attracted much attention in the field of engineering. The stress-strain curves of 5083 aluminum alloy were obtained under strain rates varying from 0.0002 s-1 to 7130 s-1 through uniaxial compression experiments. The equipment used included a CRIMS RPL100 tester, Instron tester, and split Hopkinson test system. In addition, based on dislocation dynamics and the strengthening mechanism of metals, the plastic flow of the 5083 aluminum alloy was systematically analyzed under a wide range of strain rates. It was found that the abnormal yield behavior of the 5083 aluminum alloy under a wide range of strain rates increased, and the experimental phenomenon of hardening rate decreased with an increase in strain rate. This study also revealed that the abnormal yield behavior is caused by the different dislocation mechanisms of two-phase alloy elements under different strain rates. Based on the thermal activation theory and the experimental data, a constitutive model was developed. A comparison showed good agreement between the experimental and model curves. This indicates that this model has good plastic flow stress prediction ability for such types of materials.

Output force of giant magnetostrictive actuator

2019 ◽  
Vol 33 (25) ◽  
pp. 1950301
Author(s):  
Yan Wu ◽  
Xuhui Liu ◽  
Tiantian Guo ◽  
Ye Qiu
Keyword(s):  
Force Sensor ◽  
Test System ◽  
Sensor Data ◽  
Magnetostrictive Materials ◽  
Output Force ◽  
Wide Range ◽  
Giant Magnetostrictive Materials ◽  
Data Acquisition Card ◽  
Potential Applications ◽  
Magnetostrictive Actuator

A new type of intelligent micro displacement materials, giant magnetostrictive materials (GMM), have a wide range of potential applications in the fields of micro vibrations. In this paper, a novel type of giant magnetostrictive actuator (GMA), mainly made by the giant magnetostrictive materials, is designed, and its inner structure and working principle are also discussed. To investigate the output force of giant magnetostrictive actuator, a test system, including the force sensor, data acquisition card and power supply equipment are established. The experimental results show, when the excited current increased from 0.5 A to 2 A gradually, the output force of the giant magnetostrictive actuator also gradually increased, in the condition of the pre-compress force from 100 N to 400 N, the output force of the giant magnetostrictive actuator will also increase with the increasing of the pre-compress force.

scholarly journals Effect of Demand Side Management on the Operation of PV-Integrated Distribution Systems

2020 ◽  
Vol 10 (21) ◽  
pp. 7551
Author(s):  
Jaser A. Sa’ed ◽  
Zakariya Wari ◽  
Fadi Abughazaleh ◽  
Jafar Dawud ◽  
Salvatore Favuzza ◽  
...  
Keyword(s):  
Distributed Generation ◽  
Smart Grids ◽  
Distribution Systems ◽  
Electrical Energy ◽  
Demand Side Management ◽  
Test System ◽  
Demand Side ◽  
Direct Load Control ◽  
Wide Range ◽  
Load Shape

In this new era of high electrical energy dependency, electrical energy must be abundant and reliable, thus smart grids are conducted to deliver load demands. Hence, smart grids are implemented alongside distributed generation of renewable energies to increase the reliability and controllability of the grid, but, with the very volatile nature of the Distributed Generation (DG), Demand Side Management (DSM) helps monitor and control the load shape of the consumed power. The interaction of DSM with the grid provides a wide range of mutual benefits to the user, the utility and the market. DSM methodologies such as Conservation Voltage Reduction (CVR) and Direct Load Control (DLC) collaborate in the reduction of plant generation and reciprocally to the comprehensive cost. The aim of this paper is to investigate the effects caused by the implementation of DSM on the operation of PV-integrated distribution systems. The algorithms of CVR, DLC and the combination of CVR and DLC were implemented using OpenDSS and MATLAB. The effectiveness of the aforementioned schemes was verified on IEEE 30-Bus test system. Various possible integration scenarios between Photovoltaic (PV) and DSM schemes are illustrated. The optimal integration of such schemes constraining the reduction of energy consumed by the user and utility is presented. The results show that the implemented DSM algorithms provide a noticeable reduction in energy losses and reduction in consumed energy.

scholarly journals A Tunable Plasmonic Refractive Index Sensor with Nanoring-Strip Graphene Arrays

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4489 ◽  
Author(s):  
Chunlian Cen ◽  
Hang Lin ◽  
Jing Huang ◽  
Cuiping Liang ◽  
Xifang Chen ◽  
...  
Keyword(s):  
Refractive Index ◽  
Doping Level ◽  
Transverse Electric ◽  
Resonance Wavelength ◽  
Transverse Magnetic ◽  
Refractive Index Sensor ◽  
Transmission Characteristics ◽  
Wide Range ◽  
Strip Length ◽  
Mode A

In the present study, we design a tunable plasmonic refractive index sensor with nanoring-strip graphene arrays. The calculations prove that the nanoring-strip have two transmission dips. By changing the strip length L of the present structure, we find that the nanoring-strip graphene arrays have a wide range of resonances (resonance wavelength increases from 17.73 μm to 28.15 μm). When changing the sensing medium refractive index nmed, the sensitivity of mode A and B can reach 2.97 μm/RIU and 5.20 μm/RIU. By changing the doping level ng, we notice that the transmission characteristics can be tuned flexibly. Finally, the proposed sensor also shows good angle tolerance for both transverse magnetic (TM) and transverse electric (TE) polarizations. The proposed nanoring-strip graphene arrays along with the numerical results could open a new avenue to realize various tunable plasmon devices and have a great application prospect in biosensing, detection, and imaging.

Sign in / Sign up

Export Citation Format

Share Document