A -- PERFORM FINITE ELEMENT SIMULATION OF A HIGH TEMPERATE ACTUATOR IN SILICON CARBIDE.

Notice Date

May 22, 2001

Contracting Office

NASA/Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135

ZIP Code

44135

Solicitation Number

3-176077

Response Due

May 23, 2001

Point of Contact

Konrad B. Mader, Purchasing Agent, Phone (216) 433-2138, Fax (216) 433-2480, Email Konrad.B.Mader@grc.nasa.gov -- Alice J. Wilson, Contract Specialist, Phone (216) 433-2552, Fax (216) 433-5489, Email Alice.J.Wilson@grc.nasa.gov

E-Mail Address

Konrad B. Mader (Konrad.B.Mader@grc.nasa.gov)

Description

NASA/GRC plans to issue a Request for Quotation (RFQ) for Finite Element Simulation of a High Temperature Actuator In Silicon Carbide. GENERAL DESCRIPTION: Objective: Design and simulate a silicon carbide based capacitive actuator operating at 600oC. General scope of interest: Actuators are limited in the temperature and frequency range. To control components in engine environments, new types of high temperature, high frequency actuators are needed which use new materials. This work will develop new actuators including the methods to fabricate these new actuators, make connections to the actuators, packaging of the actuators, and integration into a system. Predominately, these actuators will be microfabricated based systems which will utilize the materials development on-going elsewhere in the revolutionary advance concepts (RAC) program in ceramic piezoelectric materials and high temperature shape memory alloys. Piezoelectric actuators are electrically driven specialty dielectrics with active dipole moments. They are presently used in fuel injectors, and gearbox actuation. Smart Memory Materials (SMM) are combined with a hydraulic motion amplifier to create a flexible Electro-hydraulic actuator. This could be used to fabricate actuators with "on/off' functionality. It has the advantage of high specific power output (power/weight ratio), high force output (force/weight ratio), and only two electrical terminals are required. Disadvantages of SMM's include limited bandwidth due to low frequency response and problems with efficiency. Other types of actuators include solenoids, thermally driven actuators, and magnetoresistive actuators. However, some methods are more applicable at high temperatures than others. Statement of work: This first year of activities will include determining the needs of the variety of active combustion control applications for actuators. Therefore, this initial work in this contract will focus on concept development of a silicon carbide actuating mechanism and simulating its behavior. The result of this work will form the basis of future determination whether to pursue this effort further or not. The following therefore will be the expected minimum deliverables. Contractor is encouraged to inject new ideas and concepts with the goal of making the final outcome practically feasible and promising to encourage further investigation. 1. Utilize the linear and non-linear material properties of silicon carbide (amorphous or single crystal) to simulate high frequency (~500Hz) capacitive actuation from room temperature to 600oC, at reasonable voltage. 2. Perform parametric extraction of the actuating mechanism such as natural frequency, damping coefficient, squeeze number, stress profile (maximum stress not greater that 10% of material fracture strength) and maximum linear displacement. 3. Simulate actuation in both gaseous (methane) and liquid (water and fuel) media in a static mode (no flow). This requires the utilization of the properties of such media (e.g. viscosity and compressibility), 4. The size constraint limits the overall dimension of the actuating mechanism to 0.5x0.5mm2 footprint and static height of 0.3mm. The dynamic height (for out-of-plane displacement) is not restricted. 5. In addition to submitting a final report, PI will arrange to visit NASA Glenn Research Center to give a presentation of the work. This procurement is being conducted under the Simplified Acquisition Procedures (SAP). NASA/GRC intends to purchase the items from Cornell University. THIS IS A SOLE SOURCE. Cornell University has an established MEMS-based SiC high temperature program and have utilized the technology to demonstrate high temperature SiC pressure sensors in recent work. The university has in place ANSYS simulation tools that are compatible with NASA-Glenn tools making exchange of data easier. There are proprietary issues involved in the design concept that Cornell University has exclusive knowledge of. The Government intends to acquire a commercial item using FAR Part 12. This procurement is being conducted under the Simplified Acquisition Procedures (SAP). The Provisions and clauses in the RFQ are those in effect through FAC 97-30. An Ombudsman has been appointed. See NASA Specific Note "B". The DPAS rating for this procurement is DO-C9. This notice is for information purposes only. Any referenced notes can be viewed at the following URL: http://genesis.gsfc.nasa.gov/nasanote.html

Web Link

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Record

Loren Data Corp. 20010524/ASOL009.HTM (D-142 SN50M876)