scholarly journals Design and Realization of Recovery System of Chang’e-5 Reentry Spacecraft

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Wei Huang ◽  
Wei Rong ◽  
Dahai Liu ◽  
Changhong Jiang ◽  
He Jia ◽  
...  
Keyword(s):  
Ground Cover ◽  
Lunar Sample ◽  
Scientific Success ◽  
Technical Requirements ◽  
System Composition ◽  
Recovery System ◽  
Sample Return Mission ◽  
Design Requirements ◽  
Key Aspects ◽  
Working Procedure

On December 17, 2020, the Chang’e-5 reentry spacecraft landed safely and brought back the lunar sample without damage. This paper describes the recovery system that has critically contributed to the scientific success of the Chang’e-5 missions and presents the technical requirements and constraints of the recovery system for the Chang’e-5 reentry spacecraft and discusses the design process of the recovery system, including the system composition, working procedure, and some other key aspects. Finally, the ground cover rejection tests and air drop and flight tests were carried out to confirm the design configuration. The results showed that the Chang’e-5 reentry spacecraft recovery system was designed correctly, and its functions and performances met the design requirements. A breakthrough in the recovery technology of the reentry spacecraft was achieved for Chinese first lunar sample-return mission.

scholarly journals Structure Analysis and Design of Automobile plastic clutch pump body based on friction welding

2020 ◽  
Vol 316 ◽  
pp. 02001
Author(s):  
Jing Sheng ◽  
Aamir Sohail ◽  
Mengguang Wang ◽  
Zhimin Wang
Keyword(s):  
High Temperature ◽  
Structural Design ◽  
Friction Welding ◽  
Room Temperature ◽  
Welding Process ◽  
Structure Type ◽  
Mechanical Analysis ◽  
Analysis And Design ◽  
Technical Requirements ◽  
Design Requirements

In order to realize the need for lightweight automobiles through replacing steel with plastics, the research and development of the plastic clutch pump body based on the friction welding was carried out. For the clutch pump body connected by friction welding process between the upper pump body and the lower pump body, the technical requirements of pressure 14 MPa and durability (high temperature 7.0 × 104 times, room temperature 7.0 × 105) are required. The structure type of the upper and lower pump bodies of the end face welding type was proposed. Through the static analysis of the pump body and weld and the mechanical analysis under the working condition, the structure of the clutch pump body (upper and lower pump body) was determined. According to the established welding process, the pressure of the clutch pump body is more than 15 MPa, and the number of high-temperature durable circulation and the number of room temperature durable circulation also reached 7.2×104 and 7.3×105 times respectively. The results show that the structural design of a clutch pump body meets the design requirements.

A Review of a Radioactive Material Shipping Container Including Design, Testing, Upgrading Compliance Program and Shipping Logistics

2003 ◽  
Author(s):  
Andrew Celovsky ◽  
Randy Lesco ◽  
Brian Gale ◽  
Jeffrey Sypes
Keyword(s):  
Radioactive Material ◽  
Type B ◽  
Design Elements ◽  
Shipping Container ◽  
Global Transport ◽  
Leak Tightness ◽  
Design Requirements ◽  
Compliance Program ◽  
Integrity Tests ◽  
Key Aspects

Ten years ago Atomic Energy of Canada developed a Type B(U)-85 shipping container for the global transport of highly radioactive materials. This paper reviews the development of the container, including a summary of the design requirements, a review of the selected materials and key design elements, and the results of the major qualification tests (drop testing, fire test, leak tightness testing, and shielding integrity tests). As a result of the testing, improvements to the structural, thermal and containment design were made. Such improvements, and reasons thereof, are noted. Also provided is a summary of the additional analysis work required to upgrade the package from a Type B(U) to a Type B(F), i.e. essentially upgrading the container to include fissile radioisotopes to the authorized radioactive contents list. Having a certified shipping container is only one aspect governing the global shipments of radioactive material. By necessity the shipment of radioactive material is a highly regulated environment. This paper also explores the experiences with other key aspects of radioactive shipments, including the service procedures used to maintain the container certification, the associated compliance program for radioactive material shipments, and the shipping logistics involved in the transport.

scholarly journals Design and Experimental Investigation on Gas Oxygen/Kerosene Ejector Rocket for RBCC Application

2018 ◽  
Vol 36 (3) ◽  
pp. 558-564
Author(s):  
Xianggeng Wei ◽  
Fei Qin ◽  
Lei Shi ◽  
Baoqing Zhang ◽  
Guoqiang He
Keyword(s):  
Working Conditions ◽  
Rocket Engine ◽  
Combined Cycle ◽  
Engine Test ◽  
The Core ◽  
Technical Requirements ◽  
Core Components ◽  
Design Requirements ◽  
Working Parameters ◽  
Firing Tests

The ejector rocket is one of the core components of the rocket based combined cycle propulsion system, and must be capable of variable working conditions. In order to meet technical requirements for RBCC application, the variable duty operating ejector rocket using the gas Oxygen/Kerosene was designed based on the gas pressurized propellant feed systems. Hot firing tests of four different working conditions had been completed. Experimental results show that the designed ejector rocket engine was stable and reliable, and the working parameters met the design requirements, and the working conditions were adjusted quickly. It lays a foundation for the study of the RBCC engine test and the engine technology of large adjustment ratio.

Conceptual Studies of Design Scheme for Steam Generator in FBR

2013 ◽  
Author(s):  
Zhenxing Zhang ◽  
Huajin Yu ◽  
Zhiguang Wu ◽  
Lina Zhu
Keyword(s):  
Heat Transfer ◽  
Steam Generator ◽  
Tube Length ◽  
Heat Transfer Area ◽  
Optimization Analysis ◽  
Design Life ◽  
Basic Parameters ◽  
Design Requirements ◽  
Key Aspects ◽  
China Experimental Fast Reactor

Steam generator (SG) is one of the most important equipment in the heat transport system of China experimental fast reactor (CEFR). As per design requirements for improving economics and enhancing safety, it is necessary to make optimization analysis on various key aspects of SG. Many basic parameters were discussed in this paper, such as the design input of SG, tube-length, tube specification and the number of tubes, etc. The optimization analysis provides valuable suggestions about the number of tubes, tube-length, the heat transfer area of the margin and tube specification for the SG in its design life.

Scientific Objectives and Payloads of the Lunar Sample Return Mission—Chang’E-5

2021 ◽  
Author(s):  
Changyi Zhou ◽  
Yingzhuo Jia ◽  
Jianzhong Liu ◽  
Huijun Li ◽  
Yu Fan ◽  
...  
Keyword(s):  
Lunar Sample ◽  
Sample Return ◽  
Sample Return Mission

scholarly journals Design and Development of the WR-21 Intercooled Recuperated (ICR) Marine Gas Turbine

1994 ◽  
Author(s):  
Sam B. Shepard ◽  
Thomas L. Bowen ◽  
John M. Chiprich
Keyword(s):  
Gas Turbine ◽  
Technical Specification ◽  
Development Program ◽  
Design And Development ◽  
Performance Space ◽  
Technical Requirements ◽  
Design Requirements ◽  
Design Tradeoffs ◽  
Considerable Detail ◽  
The U.S

The U.S. Navy is developing an intercooled Recuperated (ICR) marine gas turbine, designated the WR-21, for propulsion of future surface ships. The objectives of this development program and the key technical requirements are summarized. The design of the WR-21 is described in considerable, detail. Meeting all of the design requirements for performance, space, weight, reliability, maintainability and life has been challenging. Numerous design tradeoffs and iterations have been performed to optimize the design within the constraints imposed in the ICR technical specification. Integration of the WR-21 engine into the DDG51 Flight IIA ship, which is the U.S. Navy’s first application, has influenced the WR-21 design. This paper discusses the aspects of the DDG-51 application that were factored into the design of the ICR engine in order to reduce installation costs.

Energy-Saving Design for Hydraulic Cylinder Reciprocating Seal Based on QFD

2010 ◽  
Vol 44-47 ◽  
pp. 1146-1150 ◽  
Author(s):  
Qing Qing Zhang ◽  
Fu Ying Zhang
Keyword(s):  
Energy Consumption ◽  
Environmental Factors ◽  
Environmental Pollution ◽  
Energy Saving ◽  
Hydraulic Cylinder ◽  
Customer Requirements ◽  
Oil Leakage ◽  
Technical Requirements ◽  
Before And After ◽  
Design Requirements

An energy-saving design for hydraulic cylinder reciprocating seal is proposed in this paper to improve using efficiency of seal, and reduce environmental pollution and energy consumption caused by oil leakage. HOQ of QFD is utilized to translate customer requirements into technical design requirements controlled by environmental factors, and the conflicts between technical requirements are obtained. TRIZ theory is used to resolve the conflicts, and gets energy-saving design solutions. The energy consumption compare between before and after improving seal is presented to illustrate the validation of the methods.

scholarly journals Detailed Morphologic Mapping and Traverse Planning for a Rover-based Lunar Sample Return Mission to Schrödinger Basin

2021 ◽  
Vol 2 (4) ◽  
pp. 167
Author(s):  
Zachary R. Morse ◽  
Gordon R. Osinski ◽  
Livio L. Tornabene ◽  
Matthew Bourassa ◽  
Michael Zanetti ◽  
...  
Keyword(s):  
Lunar Sample ◽  
Sample Return ◽  
Sample Return Mission

Organizing and Managing Customer Requirements During the Product Definition Phase of Design

1994 ◽  
Author(s):  
John A. Gershenson ◽  
Dileep V. Khadilkar ◽  
Larry A. Stauffer
Keyword(s):  
Quality Function Deployment ◽  
Taxonomic Structure ◽  
Customer Requirements ◽  
End User ◽  
Regulatory Requirements ◽  
Technical Requirements ◽  
Design Requirements ◽  
Definition Of ◽  
Product Definition ◽  
Definition Phase

Abstract We developed a methodology for organizing design requirements at the beginning of the design process which helps Marketing, Engineering Design, and all other stakeholders communicate from the outset. The methodology uses an expanded definition of a product’s customer which includes not only the end user, but anyone associated with the product at any point from concept through retirement. The methodology has a taxonomic structure to delineate customer requirements in four main areas: end user requirements, corporate requirements, regulatory requirements, and technical requirements. This methodology has the same objective as Quality Function Deployment yet is more robust.

Challenges and options for an affordable small Lunar Sample Return Mission

2006 ◽  
Author(s):  
Dr. Adam M. Baker ◽  
Andy Phipps ◽  
Martin Sweeting ◽  
Alex Ellery ◽  
Yang Gao
Keyword(s):  
Lunar Sample ◽  
Sample Return ◽  
Sample Return Mission
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