Engine Cycle Selection and Propulsion System Integration for Future High Performance Fighter Aircraft

1977 ◽  
Author(s):  
G. W. Lind ◽  
J. Protopapas
Keyword(s):  
System Integration ◽  
High Performance ◽  
Low Cost ◽  
Propulsion System ◽  
Fighter Aircraft ◽  
Performance Constraints ◽  
Design Variables ◽  
And Performance ◽  
Time Required ◽  
Engine Cycle

The selection and optimization of propulsion systems can be a costly and time-consuming process, especially when there are diverse performance requirements placed on the overall weapon system. Computerized procedures have been developed within the Grumman Propulsion Department to mechanize this capability and yet maintain the man-m-the-loop for full visibility during the evaluation of a candidate design concept. The system permits low cost, rapid, multidiscipline. interactive engine cycle selection and propulsion system integration to be effectively performed early in the preliminary design process of a high performance fighter aircraft. For example, the computer running time required to select a point design within a matrix of design variables and performance constraints has been reduced by 85 percent over previous techniques. This paper describes these propulsion evaluation procedures and cites a specific example of their application to the analysis of an advanced interceptor requirement.

Computational Fluid Dynamic Applications for Jet Propulsion System Integration

1991 ◽  
Vol 113 (1) ◽  
pp. 40-50 ◽  
Author(s):  
R. H. Tindell
Keyword(s):  
System Integration ◽  
Fluid Dynamic ◽  
Low Cost ◽  
Separated Flow ◽  
Propulsion System ◽  
Navier Stokes ◽  
Aerospace Vehicles ◽  
Design Engineers ◽  
Flow Phenomena ◽  
The Impact

The impact of computational fluid dynamics (CFD) methods on the development of advanced aerospace vehicles is growing stronger year by year. Design engineers are now becoming familiar with CFD tools and are developing productive methods and techniques for their applications. This paper presents and discusses applications of CFD methods used at Grumman to design and predict the performance of propulsion system elements such as inlets and nozzles. The paper demonstrates techniques for applying various CFD codes and shows several interesting and unique results. A novel application of a supersonic Euler analysis of an inlet approach flow field, to clarify a wind tunnel-to-flight data conflict, is presented. In another example, calculations and measurements of low-speed inlet performance at angle of attack are compared. This is highlighted by employing a simplistic and low-cost computational model. More complex inlet flow phenomena at high angles of attack, calculated using an approach that combines a panel method with a Navier-Stokes (N-S) code, is also reviewed. The inlet fluid mechanics picture is rounded out by describing an N-S calculation and a comparison with test data of an offset diffuser having massively separated flow on one wall. Finally, the propulsion integration picture is completed by a discussion of the results of nozzle-afterbody calculations, using both a complete aircraft simulation in a N-S code, and a more economical calculation using an equivalent body of revolution technique.

RF-MEMS Components and Networks for High-Performance Reconfigurable Telecommunication and Wireless Systems

2012 ◽  
Vol 81 ◽  
pp. 65-74 ◽  
Author(s):  
Jacopo Iannacci ◽  
Giuseppe Resta ◽  
Paola Farinelli ◽  
Roberto Sorrentino
Keyword(s):  
High Performance ◽  
Microelectromechanical Systems ◽  
Rf Mems ◽  
Low Cost ◽  
Impedance Matching ◽  
Phase Shifters ◽  
Rf Systems ◽  
Mems Technology ◽  
And Performance ◽  
Rf Performance

MEMS (MicroElectroMechanical-Systems) technology applied to the field of Radio Frequency systems (i.e. RF-MEMS) has emerged in the last 10-15 years as a valuable and viable solution to manufacture low-cost and very high-performance passive components, like variable capacitors, inductors and micro-relays, as well as complex networks, like tunable filters, reconfigurable impedance matching networks and phase shifters, and so on. The availability of such components and their integration within RF systems (e.g. radio transceivers, radars, satellites, etc.) enables boosting the characteristics and performance of telecommunication systems, addressing for instance a significant increase of their reconfigurability. The benefits resulting from the employment of RF-MEMS technology are paramount, being some of them the reduction of hardware redundancy and power consumption, along with the operability of the same RF system according to multiple standards. After framing more in detail the whole context of RF MEMS technology, this paper will provide a brief introduction on a typical RF-MEMS technology platform. Subsequently, some relevant examples of lumped RF MEMS passive elements and complex reconfigurable networks will be reported along with their measured RF performance and characteristics.

Advanced SiP Packaging Technologies of IPD for Mobile Applications

2010 ◽  
Vol 2010 (DPC) ◽  
pp. 1-20
Author(s):  
Geun Sik Kim ◽  
Kai Liu ◽  
Flynn Carson ◽  
Seung Wook Yoon ◽  
Meenakshi Padmanathan
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Autonomous Systems ◽  
System Level ◽  
Design And Technology ◽  
Wafer Level ◽  
Future Technology ◽  
Rf Transceivers ◽  
And Performance ◽  
3D Stacking

IPD technology was originally developed as a way to replace bulky discrete passive components, but it¡¯s now gaining popularity in ESD/EMI protection applications, as well as in RF, high-brightness LED silicon sub-mounts, and digital and mixed-signal devices. Already well known as a key enabler of system-in-packages (SiPs), IPDs enable the assembly of increasingly complete and autonomous systems with the integration of diverse electronic functions such as sensors, RF transceivers, MEMS, power amplifiers, power management units, and digital processors. The application area for IPD will continue to evolve, especially as new packaging technology, such as flipchip, 3D stacking, wafer level packaging become available to provide vertical interconnections within the IPD. New applications like silicon interposers will become increasingly significant to the market. Currently the IPD market is being driven primarily by RF or wireless packages and applications including, but not limited to, cell phones, WiFi, GPS, WiMAX, and WiBro. In particular, applications and products in the emerging RF CMOS market that require a low cost, smaller size, and high performance are driving demand. In order to get right products in size and performance, packaging design and technology should be considered in device integration and implemented together in IPD designs. In addition, a comprehensive understanding of electrical and mechanical properties in component and system level design is important. This paper will highlight some of the recent advancements in SiP technology for IPD and integration as well as what is developed to address future technology requirements in IPD SiP solutions. The advantage and applications of SiP solution for IPD will be presented with several examples of IPD products. The design, assembly and packaging challenges and performance characteristics will be also discussed.

Dimensional synthesis of the Delta robot using transmission angle constraintsDimensional synthesis of the Delta robot using transmission angle constraints

Robotica ◽  
2011 ◽  
Vol 30 (3) ◽  
pp. 343-349 ◽  
Author(s):  
LiMin Zhang ◽  
JiangPing Mei ◽  
XueMan Zhao ◽  
Tian Huang
Keyword(s):  
Dynamic Performance ◽  
Volume Ratio ◽  
Dimensional Synthesis ◽  
Performance Constraints ◽  
Global Dynamic ◽  
Design Variables ◽  
Transmission Angle ◽  
Pressure Transmission ◽  
Delta Robot ◽  
And Performance

SUMMARYThis paper deals with dynamic dimensional synthesis of the Delta robot using the pressure/transmission angle constraints. Two types of pressure/transmission angles are defined, with which the direct and indirect singularities can be identified in a straightforward manner. Two novel global dynamic metrics are proposed for minimisation, which are associated respectively with the inertial and centrifuge/Coriolis components of the driving torque. Various geometrical and performance constraints are taken into account in terms of workspace/machine volume ratio, pressure/transmission angles, etc. The effects of pressure/transmission angle constraints on the feasible domain of design variables are investigated in depth via an example, and a set of optimised dimensional parameters is obtained for achieving a good kinematic and dynamic performance throughout the entire task workspace.

Cycle Considerations for Tactical Fighters in the Early 1990’s

1982 ◽  
Author(s):  
H. D. Snyder
Keyword(s):  
Cross Sections ◽  
Fighter Aircraft ◽  
Significant Parameter ◽  
Operation And Maintenance ◽  
Radar Cross Sections ◽  
And Performance ◽  
The Cost ◽  
Engine Cycle

The requirements for tactical fighter aircraft in the early nineties will call for improved maneuverability from current fighters, as well as shorter takeoff and landing distances, reduced radar cross-sections and IR signatures, and supersonic persistence. Also, the cost of procurement, operation and maintenance of the engine (LCC) will be a significant parameter in determining the type and performance of the next fighter engine. Each of the above requirements has an effect on the engine cycle to be chosen for the next fighter engine. The sum of these effects should result in a specific engine cycle which best answers all of the aircraft needs, but the effects of these requirements tend toward diverse cycles. This paper addresses these issues and presents a comparison of cycles that meet the anticipated requirements for tactical fighter aircraft in the early nineties. The paper also compares the usage of such aircraft in peacetime training to the design mission in combat.

scholarly journals Properties of Foamed Lightweight High-Performance Phosphogypsum-Based Ternary System Binder

2020 ◽  
Vol 10 (18) ◽  
pp. 6222 ◽  
Author(s):  
Girts Bumanis ◽  
Jelizaveta Zorica ◽  
Diana Bajare
Keyword(s):  
Ternary System ◽  
High Performance ◽  
Raw Materials ◽  
Low Cost ◽  
Construction Materials ◽  
Mineralogical Composition ◽  
Point Of View ◽  
Raw Material ◽  
Total Energy Consumption ◽  
And Performance

The potential of phosphogypsum (PG) as secondary raw material in construction industry is high if compared to other raw materials from the point of view of availability, total energy consumption, and CO2 emissions created during material processing. This work investigates a green hydraulic ternary system binder based on waste phosphogypsum (PG) for the development of sustainable high-performance construction materials. Moreover, a simple, reproducible, and low-cost manufacture is followed by reaching PG utilization up to 50 wt.% of the binder. Commercial gypsum plaster was used for comparison. High-performance binder was obtained and on a basis of it foamed lightweight material was developed. Low water-binder ratio mixture compositions were prepared. Binder paste, mortar, and foamed binder were used for sample preparation. Chemical, mineralogical composition and performance of the binder were evaluated. Results indicate that the used waste may be successfully employed to produce high-performance binder pastes and even mortars with a compression strength up to 90 MPa. With the use of foaming agent, lightweight (370–700 kg/m3) foam concrete was produced with a thermal conductivity from 0.086 to 0.153 W/mK. Water tightness (softening coefficient) of such foamed material was 0.5–0.64. Proposed approach represents a viable solution to reduce the environmental footprint associated with waste disposal.

A Middle-Ranking Cadre of Universities Evaluation Management Information System Based on SOA

2013 ◽  
Vol 462-463 ◽  
pp. 1068-1071
Author(s):  
Zhi Biao Li ◽  
Guo Lin Nie ◽  
Qun Zheng ◽  
Hong Liu ◽  
Chun Hua Liao
Keyword(s):  
Information System ◽  
Software Reuse ◽  
Management Information System ◽  
System Integration ◽  
Low Cost ◽  
Management Information ◽  
Loosely Coupled ◽  
Independent Information ◽  
And Performance ◽  
Set Up

In order to meet various needs and realize software reuse, a middle-ranking cadre of universities evaluation management information system (MCE-MIS) based on SOA is proposed. It is a loosely coupled, protocol independent information system integrating existing information systems such as Personnel and Performance MIS. After analyzing the requirement of the system, the cadre evaluation flowchart, use case and system integration solution are described in detail. SOA provides a solution to set up low-cost, open and flexible integration system in universities.

Fabrication and Performance Analysis of PMMA Substrate Diffuser/Nozzle Micro-Pump by CNC Milling Machine

2009 ◽  
Vol 60-61 ◽  
pp. 198-201
Author(s):  
Li Tian ◽  
Wei Wang ◽  
Xiao Wei Liu ◽  
Ying Zhang ◽  
Shu Yi Ji
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Maximum Flow ◽  
Microfluidic System ◽  
Milling Process ◽  
Cnc Milling ◽  
Micro Pump ◽  
Orifice Flow ◽  
And Performance ◽  
Nozzle Structure

A new low cost high performance PMMA micropump, developed for microfluidic system, is presented. According to the orifice flow theory, a diffuser/nozzle structure is fabricated with precision milling process, and packaged with the film-sealing at the condition of thermal bonding process. The size parameter of the diffuser/nozzle structure is 2.5mm *150µm, 8° conical angle, the volume of PMMA micropump is 14×14×2.5 mm3. And experimental results show that the PMMA micropump can produce a maximum back pressure of 1906.1Pa and a maximum flow rate of 564µL/min under 220 V, 500Hz squired wave power supply.

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