Experimental investigations on the self-ignition of a thermally decomposed endothermic fuel in hot supersonic air flow in the MPP-LAERTE combustion test bench

2008 ◽  
Author(s):  
Axel Vincent-Randonnier ◽  
Bruno Rouxel ◽  
Patrick Roux ◽  
Michel Poirot ◽  
Mickaël Sicard ◽  
...  
Keyword(s):  
Test Bench ◽  
Air Flow ◽  
The Self ◽  
Experimental Investigations

Concurrent Energy Harvesting From Vibratory Base Excitations and Aerodynamic Flows

2013 ◽  
Author(s):  
Amin Bibo ◽  
Mohammed F. Daqaq
Keyword(s):  
Output Power ◽  
Amplitude Modulation ◽  
Air Flow ◽  
Excitation Frequency ◽  
The Self ◽  
Experimental Investigations ◽  
Aerodynamic Load ◽  
Base Excitation ◽  
Flutter Speed ◽  
Sustained Oscillations

This paper presents theoretical and experimental investigations into the potential of utilizing a piezoaeroelastic micropower generator to harvest energy from the combination of an external base excitation and an aerodynamic load. In particular, a harvester consisting of a rigid airfoil supported by a flexural piezoelectric beam and a torsional spring is placed in an incompressible air flow and subjected to an external harmonic base excitation in the plunge direction. Electromechanical equations describing the nonlinear system are given along with theoretical simulations. The performance of the piezoaeroelastic generator is studied experimentally below and above the flutter speed and found to exhibit qualitative agreement with the theory. Below the flutter speed, the response of the harvester is observed to be always periodic with the air flow serving to amplify the influence of the base excitation on the response by reducing the effective stiffness of the system, and hence, increasing the RMS output power. Beyond the flutter speed, the harvester’s response and its performance were observed to depend on the nearness of the excitation frequency to the frequency of the self-sustained oscillations induced by the flutter instability and the magnitude of the base excitation. When the base excitation is small and/or the excitation frequency is not close to the frequency of the self-sustained oscillations, the response of the harvester is two-period quasiperiodic with amplitude modulation due to the presence of two incommensurate frequencies. This amplitude modulation reduces the RMS output power. On the other hand, when the frequency of excitation is close to the frequency of the self-sustained oscillations and/or the amplitude of excitation is large enough to quench the quasiperiodic behavior, the response becomes periodic and the output power increases exhibiting little dependence on the base excitation.

A Study on the Instability of Disk-Shaped Gear

1999 ◽  
Author(s):  
Guangming Ren ◽  
Litang Yan
Keyword(s):  
Perturbation Method ◽  
Traveling Wave ◽  
Vibration Characteristics ◽  
Exciting Force ◽  
Nonlinear Perturbation ◽  
The Self ◽  
Experimental Investigations ◽  
Damping Force ◽  
Bevel Gears ◽  
Theory And Experiment

Abstract In this paper the theory and experiment concerning vibration instability of disk-shaped gear are presented. At first the self-exciting force of gear is searched and the works done by the exciting force and damping force are analyzed. Then the vibration instability of the disk-shaped plain gear is studied with multiple scale’s method of the nonlinear perturbation method. The vibration characteristics of a coupled pair of bevel gears are investigated experimentally. Both theoretical and experimental investigations show that there are actually self-exciting vibrations on the gear. Under certain conditions the forward traveling wave vibration of the driving gear and the backward traveling wave vibration of the driven gear can be instable.

scholarly journals IMPROVEMENT OF MACHINE SAFETY DEVICES

2018 ◽  
Vol 58 (1) ◽  
pp. 17 ◽  
Author(s):  
Bohdan Matviiovych Hevko ◽  
Roman Bohdanovych Hevko ◽  
Oleksandra Mykolaivna Klendii ◽  
Mykola Vasyliovych Buriak ◽  
Yurii Volodymyrovych Dzyadykevych ◽  
...  
Keyword(s):  
Optimum Design ◽  
Test Bench ◽  
Theoretical Calculations ◽  
Experimental Investigations ◽  
Dynamic Parameters ◽  
Safety Devices ◽  
Basic Parameters ◽  
Machine Safety ◽  
Made In ◽  
New Machine

The article presents a development of new machine safety devices, which provide protection of operating elements from overload. Theoretical calculations have been made in order to determine the optimum design, kinematic and dynamic parameters of safety devices. A test bench has been developed and experimental investigations have been conducted in order to determine basic parameters of overload clutches.

Design and experimental study of the self-adaptive splitting technology of lotus seeds

2020 ◽  
pp. 1-11
Author(s):  
Ange Lu ◽  
Qiucheng Ma ◽  
Jie Ma
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Firefly Algorithm ◽  
Test Bench ◽  
The Self ◽  
Linkage Mechanism ◽  
Lotus Seed ◽  
Medicinal Value ◽  
Splitting Process ◽  
Self Adaptive

The lotus plumule has high medicinal value and is an important part of the lotus seed. Usually, the lotus seed must be split symmetrically into two halves through a splitting process to obtain an intact lotus plumule. However, this process is difficult to mechanize and automate, as different lotus seeds are of different sizes. In this study, a novel automatic self-adaptive splitting technology (SAST) is proposed for lotus seeds, based on a specially designed combined linkage mechanism and a roller pair centering mechanism. The technology can automatically adjust the position of the splitting point taper punch according to the size of the lotus seed and ensure that the tip of the punch is on the axis of the lotus seed. First, the centering deviation of the centering mechanism was analyzed. A mathematical model for the SAST was developed, and the key parameters were optimized using the firefly algorithm. An automatic splitting machine and a test bench were designed for centering deviation measurements, and both centering and splitting experiments were conducted. The generated maximum centering deviation of the SAST was <0.176 mm; the highest accurate splitting rates of 95% and 93.05% were achieved for unclassified and graded lotus seeds, respectively.

Research and Design of Air Conditioning Air Flow Test Bench

2013 ◽  
Vol 748 ◽  
pp. 517-520
Author(s):  
Yin Han Gao ◽  
Jing Yuan Zhao ◽  
Kai Yu Yang ◽  
Tian Hao Wang ◽  
Ran Jing ◽  
...  
Keyword(s):  
Air Conditioning ◽  
Gas Flow ◽  
Test Bench ◽  
Air Flow ◽  
Computer Software ◽  
Indirect Measurement ◽  
Experimental Result ◽  
Experiment Platform ◽  
Automotive Air Conditioning ◽  
Result Analysis

According to the air flow measurement principle, an automobile conditioner each outlet and atmospheric pressure based on zero characteristics has been developed. The experiment platform adopts V cone flowmeter gas flow indirect measurement of automotive air conditioning of the air outlet pipe, a detailed description of the design of the test bench of mechanical structure, measuring circuit, computer software, through the experimental result analysis, can realize the accurate measurement of air.

scholarly journals TEST BENCH FOR INVESTIGATION OF WAVE DEFORMATION STRENGTHENING PROCESSES

2019 ◽  
Vol 2019 (12) ◽  
pp. 50-57
Author(s):  
Andrey Kirichek ◽  
Sergey Barinov ◽  
Sergey Silantiev ◽  
Aleksandr Yashin ◽  
Aleksandr Konstantinov
Keyword(s):  
Surface Layer ◽  
Test Bench ◽  
Experimental Investigations ◽  
Micro Hardness ◽  
Advantages And Disadvantages ◽  
Deformation Parameters ◽  
Wave Deformation ◽  
Wide Range ◽  
Shock System ◽  
Mutual Disposition

In the paper there are described designs of test benches to investigate the regularities of wave deformation strengthening processes. The advantages and disadvantages of well-known designs are revealed. A design of a new advanced test bench having wider technological potentialities and saved from the drawbacks revealed of the equipment created earlier is offered. A new design of the bench allows investigating the influence upon a process of a wave deformation strengthening of the elements of a shock system the parameters of which are varied in a wide range and applying also a series of marks upon a tested surface of a sample with the assurance of a specified accuracy of their mutual disposition. The test bench developed is essential for the fulfillment of experimental investigations of the interconnection between wave deformation parameters, a shape, dimensions of samples to be strengthened and a card of micro-hardness of a strengthened surface layer.

Ultraschallunterstützte Umformung von Metallen*/Ultrasonic-assisted forming of metals - Development of a test bench for material characterization with 15 kHz ultrasonic vibrations

2015 ◽  
Vol 105 (10) ◽  
pp. 715-721
Author(s):  
M. Michalski ◽  
M. Merklein
Keyword(s):  
High Frequency ◽  
Material Characterization ◽  
Test Bench ◽  
Flow Behavior ◽  
High Frequency Oscillation ◽  
Experimental Investigations ◽  
Metallic Materials ◽  
Frequency Oscillation ◽  
Ultrasonic Assisted ◽  
Forming Tools

Umformwerkzeuge, die mit einer hochfrequenten mechanischen Schwingung überlagert werden, ermöglichen eine deutliche Reduzierung der benötigten Umformkräfte. Darauf aufbauend werden am Lehrstuhl für Fertigungstechnologie experimentelle Untersuchungen mit verschiedenen metallischen Werkstoffen durchgeführt, um deren Fließverhalten bei Ultraschallüberlagerung mit 15 kHz zu charakterisieren. Die aktuelle Studie befasst sich mit der Entwicklung und der Qualifizierung eines geeigneten Prüfstands. &nbsp; Forming tools that are superimposed with a high frequency oscillation enable a considerable reduction of the required forming forces. On this basis experimental investigations with various metallic materials are conducted at the Institute of Manufacturing Technology to characterize the flow behavior during ultrasonic-assisted forming with 15 kHz oscillation frequency. This study is concerned with the development and the qualification of a suitable test bench.

NUMERICAL AND EXPERIMENTAL INVESTIGATIONS OF THE AIR FLOW AND HEAT TRANSFER ALONG THE ENTIRE DUCT OF A HYPERSONIC WIND TUNNEL

2019 ◽  
Vol 50 (2) ◽  
pp. 141-153
Author(s):  
Sergei Mikhailovich Drozdov ◽  
Rashid Anvarovich Davletkil'deev ◽  
Alena Sergeevna Rtishcheva
Keyword(s):  
Heat Transfer ◽  
Wind Tunnel ◽  
Air Flow ◽  
Experimental Investigations ◽  
Flow And Heat Transfer ◽  
Hypersonic Wind Tunnel

Experimental Investigations of the Self-Controlled Synchronous Motor Connected to a Three-Phase Line Commutated SCR Inverter

2016 ◽  
Vol 7 (1) ◽  
pp. 1
Author(s):  
Tapan Kumar Chakraborty
Keyword(s):  
Steady State ◽  
Synchronous Motor ◽  
The Self ◽  
Experimental Investigations ◽  
Phase Line ◽  
Three Phase ◽  
In Series ◽  
Terminal Voltage ◽  
Excitation Winding ◽  
Steady State Performance

<p>This paper concerns the experimental investigations of the three-phase line commutated SCR inverter fed synchronous motor.  The fabricated system consists of a line-commuted inverter, a three-phase synchronous motor with the excitation winding connected in series to the inverter input, a terminal voltage sensor and a gate-pulse generating circuit. The firing pulses for SCRs of the inverter are generated by the microprocessor in proper sequence with the help of synchronizing signal derived from the terminal voltages of the synchronous machine. The steady state performance characteristics are obtained experimentally using the fabricated system. The experimental results show that a three-phase synchronous motor supplied by a line commutated inverter with the excitation winding connected in series to the dc link provide  excellent characteristics of the conventional dc series motor.</p>

Research of Window's Discharge Coefficient in the Natural Ventilation Room

2014 ◽  
Vol 525 ◽  
pp. 420-426
Author(s):  
Qi Hai Liao ◽  
Yan Ling Guan ◽  
Qiao Ning Wang
Keyword(s):  
Pressure Difference ◽  
Natural Ventilation ◽  
Discharge Coefficient ◽  
Test Bench ◽  
Air Flow ◽  
Experimental Conditions ◽  
Flow Through

Discharge coefficient of window is one of the important factors in natural ventilated calculation, while there are many factors may impact the windows discharge coefficient. This article adopts the method of experiment, simulate the natural ventilation of room on the test bench , by measuring the pressure difference of both sides of window and the air flow through the window under different experimental conditions, analyze how the opening rate of window and the air flow impact the values of discharge coefficient of window, and giving the value of discharge coefficient of window under the experiment condition, hoping to provide help to the use of natural ventilation of building effectively.

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