scholarly journals Development of On-Board Tilt Mirror Calibration Mechanism without Holding and Release Mechanism

Aerospace ◽  
2021 ◽  
Vol 8 (10) ◽  
pp. 284
Author(s):  
Yeon-Hyeok Park ◽  
Mun-Shin Jo ◽  
Hun-Young Kim ◽  
Dai-Ho Ko ◽  
Hyun-Ung Oh
Keyword(s):  
Life Cycle ◽  
Mechanism Design ◽  
Design Strategy ◽  
Structural Safety ◽  
Release Mechanism ◽  
Test Results ◽  
Release Device ◽  
Mass Balancing ◽  
Imaging Sensor ◽  
Novel Design

The on-board tilting mirror calibration mechanism has a mechanical driving part that helps to achieve the main functional modes of deployment and stow when calibrating a spaceborne imaging sensor. In general, it is necessary to consider a holding and release device in the mechanism design, to secure the structural safety of the mechanical driving part in severe launch environments. However, in the present study, we proposed a novel design strategy based on mass balancing, to guarantee mechanical safety on the driving part of the tilt mirror mechanism, although the implementation of the holding and release mechanism was not considered in the design. The effectiveness of the proposed design was experimentally verified via launch vibration and life cycle tests. The test results demonstrated that the mechanism fulfills all the required functions, and the design approach proposed in this study is effective for ensuring mechanical safety on the driving part of the tilting mirror mechanism in severe launch vibration environments.

A novel design strategy of a practical carbon anode material from a single lignin-based surfactant source for sodium-ion batteries

2020 ◽  
Vol 56 (45) ◽  
pp. 6078-6081 ◽  
Author(s):  
Changhao Li ◽  
Yi Sun ◽  
Qiujie Wu ◽  
Xin Liang ◽  
Chunhua Chen ◽  
...  
Keyword(s):  
Anode Material ◽  
Design Strategy ◽  
Sodium Ion ◽  
Carbon Anode ◽  
Sodium Ion Batteries ◽  
Lignin Sulfonate ◽  
Novel Design

A schematic illustration showing the preparation of HCM from a single sodium lignin sulfonate source and the process of Na storage.

scholarly journals Risk-Informed Performance-Based Metrics for Evaluating the Structural Safety and Serviceability of Constructed Assets against Natural Disasters

2021 ◽  
Vol 13 (11) ◽  
pp. 5925
Author(s):  
Nuno Marques de Almeida ◽  
Maria João Falcão Silva ◽  
Filipa Salvado ◽  
Hugo Rodrigues ◽  
Damjan Maletič
Keyword(s):  
Life Cycle ◽  
Built Environment ◽  
Natural Disasters ◽  
Evaluation Criteria ◽  
Design Methods ◽  
Structural Safety ◽  
Building Structures ◽  
Natural Agents ◽  
Long Life ◽  
Physical Asset

The tangible and intangible value derived from the built environment is of great importance. This raises concerns related to the resilience of constructed assets to both human-made and natural disasters. Consideration of these concerns is present in the countless decisions made by various stakeholders during the decades-long life cycle of this type of physical asset. This paper addresses these issues from the standpoint of the engineering aspects that must be managed to enhance the structural safety and serviceability of buildings against natural disasters. It presents risk-informed performance-based parameterization strategies and evaluation criteria as well as design methods to embed differentiated levels of structural safety and serviceability of buildings against wind, snow, earthquakes and other natural agents. The proposed approach enables designers to assure the resilience and reliability of building structures against natural risks.

Design and Kinematic Simulation of a Novel Leg Mechanism for Multi-Legged Robots

2021 ◽  
Author(s):  
Simone Asci ◽  
Ketao Zhang
Keyword(s):  
Legged Locomotion ◽  
Design Strategy ◽  
Research Field ◽  
Original Model ◽  
Legged Robots ◽  
Robotic Systems ◽  
Complex Control System ◽  
Robotic Leg ◽  
Novel Design ◽  
Original Configuration

Abstract Among mobile robotic research field, legged locomotion is largely applied for advanced robotic systems due to the higher degree of versatility compared to wheeled robots, which allows them to successfully move and interact in unstructured environments; nevertheless, legged robots present several designing problems and require a much more complex control system. Based on an effective robotic leg, this paper presents a novel design, which integrates a cam joint, aimed to improve the versatility performances minimizing changes in the original model and without increasing the control complexity. Furthermore, the design strategy aims to exploit the coupled action of two actuators, which are disposed in a novel configuration so to gain versatility advantage while maintaining velocity performances of legs equipped with a single actuator. The model is presented through a kinematic analysis, followed by the simulation of the leg mechanism trajectory and a comparison with the original configuration.

In-flight reconfiguration of lithium-ion cells aimed at extending flight times and range of electrically powered UAVs

2019 ◽  
Vol 7 (3) ◽  
pp. 98-111 ◽  
Author(s):  
Svetoslav Zabunov ◽  
Garo Mardirossian
Keyword(s):  
Design Methodology ◽  
Lithium Ion ◽  
Test Results ◽  
Content Type ◽  
Test Setup ◽  
Lithium Ion Cells ◽  
Battery Design ◽  
Novel Design ◽  
Battery Module

Purpose The purpose of this paper is to disclose a novel reconfiguration battery design suitable for electrically powered UAVs. Design/methodology/approach A design of a reconfigurable battery module is presented. Test setup with prototype battery module is developed and described. Test results of measurements are shown and discussed. Findings The results ascertain the benefits of implementing a reconfigurable battery in small electrically powered UAVs and specifically prove the efficiency of the proposed design. Originality/value The proposed novel design is compared to previous work while advances from the latter and the gained advantages were established.

A novel design strategy for deeper blue and more stable thermally activated delayed fluorescent emitters

2020 ◽  
Vol 78 ◽  
pp. 105610
Author(s):  
Hua Sun ◽  
Xiao Tan ◽  
Shenglong Sang ◽  
Qian Liu ◽  
Po Sun ◽  
...  
Keyword(s):  
Design Strategy ◽  
Thermally Activated ◽  
Novel Design

A Study to Determine Factors That Have Influence on the Propensity of Natural LSPI Occurring in GTDI Engines

2018 ◽  
Author(s):  
Paras Sethi ◽  
Eric Passow ◽  
Kimm Karrip ◽  
Max Maschewske ◽  
Jason Bieneman ◽  
...  
Keyword(s):  
Life Cycle ◽  
Effective Means ◽  
Test Procedure ◽  
Engine Performance ◽  
Test Results ◽  
Performance Targets ◽  
Power Cylinder ◽  
The Many ◽  
Procedure Development ◽  
Vehicle Platform

There are many articles and papers published about the developments in engine downsizing as an effective means in reducing vehicle fuel consumption while improving engine performance. The increase in performance of gasoline turbo charged direct injected (GTDI) engines, in conjunction with diverse vehicle platform performance targets (i.e. towing capability) and higher gear transmissions pushes the engine to operate with higher torques at lower engine speeds. This operating condition has increased the propensity of an abnormal combustion event, known as Low Speed Pre-Ignition (LSPI) or Stochastic Pre-Ignition (SPI). The power cylinder unit (PCU) components exposed to this pre-ignition event can experience failure. The engine manufacturers, as well as MAHLE, continue to ensure engine and PCU component survivability against LSPI by performing life cycle robustness testing. MAHLE’s research of LSPI continues to focus on the robustness of PCU components in the presence of LSPI events, as well as investigating design developments that have the potential to minimize the propensity of LSPI to occur. The test procedure development for evaluating natural LSPI events will be presented. Various test results and parameter sensitivities that were documented during this procedure development, along with the many challenges associated with engine performance repeatability will be discussed. Parameters that were found to influence LSPI propensity, as well as parameters that were found not to influence LSPI propensity will be discussed.

The Structural Safety Test Research for 300 MW PWR Control Rod Driver Machine Pressured Shell

2005 ◽  
Author(s):  
Weiming Sun ◽  
Xing Ren ◽  
Kangda Zhang
Keyword(s):  
Safety Margin ◽  
Operating Mode ◽  
Structural Safety ◽  
Test Results ◽  
Load Bearing ◽  
Control Rod ◽  
Safety Test ◽  
Inner Pressure ◽  
Asme Code ◽  
Analyze Structure

The safety analysis and test research are done to inspect the safety of 300MW control rod drive machine (CRDM) pressured shell structure in a systematic way. The test result agrees accords with FEA result. In actual operating mode (300 °C) inner-pressure fatigue simulative test, the axial and hoop pre-cracks are made, and the fatigue crack growth is observed. The load-bearing capability and deformation are tested in shell-burst test. Based on test research, this paper analyses theoretical load-bearing capability and safety margin in accordance with ASME CODE Sec. III design is calculated. Elastic-plastic fracture mechanics theory and GEGB.R6 method is used to analyze structure safety. The test results show pressure shell’s safety allowance is large enough.

DEVELOPMENT OF MAGNETIC GEAR MECHANISMS

2017 ◽  
Vol 41 (5) ◽  
pp. 758-770
Author(s):  
Yi-Chang Wu ◽  
Chin-Tsung Chan
Keyword(s):  
Mechanism Design ◽  
Topological Structure ◽  
Design Methodology ◽  
Permanent Magnets ◽  
Graph Representation ◽  
Speed Ratio ◽  
Design Requirements ◽  
Magnetic Gear ◽  
Novel Design ◽  
The Magnetic Field

The purpose of this study is to develop novel magnetic gear mechanisms by using creative mechanism design methodology. First, the flowchart of creative mechanism design methodology is introduced. The schematic diagram and graph representation of a magnetic gear device based on its topological structure are presented. Next, the characteristics of the topological structure of an existing 4-link magnetic gear device are analyzed. Feasible specialized chains are then enumerated, subject to design requirements and constraints. The direction of magnetization in permanent magnets is defined and applied to magnetic gear mechanisms. Finally, 12 novel magnetic gear mechanisms with 5 links are synthesized. The magnetic field, transmitted torque and speed ratio of a novel design are analyzed by 2-D FEA.

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