Spray automated balancing of rotors: Methods and materials

The work described consists of two parts. In the first part, a survey is performed to assess the state of the art in rotor balancing technology as it applies to Army gas turbine engines and associated power transmission hardware. The second part evaluates thermal spray processes for balancing weight addition in an automated balancing procedure. The industry survey reveals that: (1) computerized balancing equipment is valuable to reduce errors, improve balance quality, and provide documentation; (2) slow-speed balancing is used exclusively, with no forseeable need for production high-speed balancing; (3) automated procedures are desired; and (4) thermal spray balancing is viewed with cautious optimism whereas laser balancing is viewed with concern for flight propulsion hardware. The FARE method (Fuel/Air Repetitive Explosion) was selected for experimental evaluation of bond strength and fatigue strength. Material combinations tested were tungsten carbide on stainless steel (17-4), Inconel 718 on Inconel 718, and Triballoy 800 on Inconel 718. Bond strengths were entirely adequate for use in balancing. Material combinations have been identified for use in hot and cold sections of an engine, with fatigue strengths equivalent to those for hand-ground materials

Development of optimum clamp combinations for strap-down inertial measuring units with field replaceable sensors

Optimum clamp combinations for strap down inertial measuring units with field replaceable sensor

X-Ray Tube Anode Balance Analysis and Vacuum Balancer Parameter Optimization

A manufacturing facility is introducing the company\u27s first straddle mount liquid metal spiral groove bearing (SGB) on a rotating anode x-ray tube. In a manufacturing environment, it is critical that processes are robust and timely to drive down costs while also responding to market demand for improvement. There is currently a lot of variation in the anode balance process. Furthermore, there are repeatability questions surrounding the new balancing system that is used in this anode balance process. To better understand the characteristics of the new liquid metal SGB anode and the effects of measurement system variation, the measurement system will be isolated to determine the critical variables. It is hypothesized that the characteristics of the spiral groove liquid metal bearing are the cause of measurement system uncertainty below 1.0 g*cm. Data has been collected using two rotating anode platforms: i) liquid metal SGB; and ii) a ball bearing rotating anode system. The data will be used to compare measurement system repeatability of the SGB anode against the ball bearing anode for the same balance and correction process. After each unbalance measurement, a correction process is initiated where by material is removed from the correction planes as determined by the balance machine. Cutter depth, operator interaction, and machine repeatability play a vital role in the balance quality of the rotating anode system. The success of this thesis is to determine the critical variables and factors driving the measurement uncertainty in order to reduce cycle time

Structures performance, benefit, cost-study

New technology concepts and structural analysis development needs which could lead to improved life cycle cost for future high-bypass turbofans were studied. The NASA-GE energy efficient engine technology is used as a base to assess the concept benefits. Recommended programs are identified for attaining these generic structural and other beneficial technologies

JPL spacecraft sterilization technology program - A status report

Facility description and procedures for heat and ethylene oxide sterilization of spacecraft instrumentation, components, and material

Study for the development of an endurance testing method for washing machines

This study is part of a technical support contract signed between DG Environment and DG Joint Research Centre, regarding Environmental Footprinting, material efficiency in product policy and the European Platform on LCA (2013-2017). In particular, Task and Deliverable 8 are entitled “Develop/test potentially standardized method on material efficiency, to be applied to relevant product groups” and aim at developing feasibility studies on potentially standardized methods for assessing durability of products. The main objective of this report consists of outlining and testing a procedure for assessing durability of electric washing machines for household use. In particular the report will: • investigate existing endurance tests, • define whether such endurance tests can be suitable for a possible standardised testing procedure, • develop and test a durability procedure on exemplary washing machines, and • assess the durability procedure and provide guidelines for future development. Chapters 2 and 3 of the present report concern I) a literature review, with a focus on the state of the art of washing machine durability, the average usage in Europe, frequent failure modes and different existing theories behind durability tests; II) the study of existing international standards, currently dealing with safety of electronic devices and household appliances, endurance requirements for washing machine parts and guidelines to assess the performance during the washing cycle; III) comments and feedback from experts that were contacted during the study in order to gather information about tests, non-disclosed procedures, failure mode statistics and possible answers to the question of methods able to measure or to verify durability. Chapter 4 provides the scientific background about the dynamics of a horizontal axis washing machine, which can be seen physically as a vibrating system where the tub (including the drum) is fixed with springs on the top of the housing. Finally, a novel procedure for durability testing is proposed in chapter 5. The proposed method is a first attempt to find a framework in which several washing machine types can fit in and, eventually, a point of discussion for further improvements and diversification. The results of the proposed method are presented in chapter 6 and discussed in chapter 7.JRC.D.3-Land Resource