Farmers have always been vulnerable to weather and price fluctuations, and John Deere has been supplying them heavy equipment since there was heavy equipment to supply. Now farmers' desire for stable income and access to open land and Deere's financial clout and expertise with large machinery are combining to...
When designing a complex mechanical system there is always considerable emphasis on reducing the time spent determining the best design. Understanding factors contribute to the performance of the system as rapidly as possible is very important. Supersaturated Statistical Designs SSDs offer a potentially useful way to investigate many factors with...
The Engine Alliance's GP7200 engine has exceeded performance expectations for specific fuel consumption and exhaust gas temperature margin during initial ground testing. The GP7000 builds on the proven GE90 core and the PW4000 low-pressure system. The GP7200 engine features a hollow-titanium, swept wide chord fan; a. five-stage low-pressure compressor; a...
This paper provides the aim of the project 'HydroPak: Concept design and analysis of a packaged crossflow turbine' was to undertake industrial research to complete the conceptual design and economic optimization of a modular and standardized crossflow microhydro turbine called the HydroPak. The objectives were to develop a concept design...
This paper discusses advanced wind turbine control algorithms which have become more important over the last years in order to deal with high requirements on reliability, cost of energy and extreme operating offshore conditions. An open source modular 'Design tool for wind turbine control algorithms' within the Matlab environment enables...
An advanced generator control algorithm has been developed and implemented in ECN's control design tool for wind turbines. For wind speeds above nominal the algorithm limits power and rotor speed to the common bounds of constant power control in variable speed turbines, while the electromagnetic torque varies half as much...
This paper focuses on the prevailing turbine concept variable speed, pitch to vane. For a pitch controlled variable speed wind turbine, a feed forward control structure based on the estimation of rotor averaged wind speed has been developed and analyzed. The additional control action will accelerate ordinary rotor speed feedback...
The design of offshore wind turbines requires assessing a huge amount of different sea states and wind conditions. Therefore the calculation efficiency of a combined time/frequency domain approach is attractive. This was the reason for the development of the frequency domain tool TURBU Offshore. In addition, such a tool is...
In this paper, an algorithm has been developed that provides filter parameters for pitch control loops in order to compensate for dynamic inflow effects. This improves the loop stability, especially near rated conditions. The filter behavior reflects the 'inverse of the normalized' rotor-integral dynamic wake behavior in accordance with the...
The paper considers a farm as a single energy extracting body instead of a superposition of individual energy extractors i.e. winds turbines. As a result it found two new hypotheses called Heat and Flux. Both hypotheses reveal that the classical operation of turbines in a wind farm at the Lanchester-Betz...
This document is a simplified ASME performance test procedure which Dresser-Rand believes is satisfactory for the majority of non-condensing turbines. The instrumentation required for this test is much less costly, and fewer component readings are needed to obtain good results as compared to a full ASME PTC-6 test. In this...
This paper discusses the test procedure that follows is intended to convey Dresser-Rand's position to customers in regard to field performance acceptance testing. The instrumentation required for the Dresser-Rand test is less costly and fewer component readings are required as compared to a PTC-6 high accuracy performance acceptance test. This...
The following document is a simplified ASME performance test procedure which Dresser-Rand believes is satisfactory for a high percentage of non-condensing turbines. The instrumentation required for this test is much less costly, as compared to a full ASME PTC-6 enthalpy drop acceptance test. In this simplified test, only the quantities...
This paper discusses the test procedure that follows is intended to convey Dresser-Rand's position to customers in regard to field performance acceptance testing. The instrumentation required for the Dresser-Rand test is less costly and fewer component readings are required as compared to a PTC-6 high accuracy performance acceptance test. This...
The following document is a simplified ASME performance test procedure which Dresser-Rand believes is satisfactory for the majority of extraction condensing regenerative cycles. The instrumentation required for this test is much less costly, and fewer component readings are needed to obtain good results as compared to a full ASME PTC-6...
This paper discusses about the capability for full speed turbine water washing which has become an increasing requirement, especially on mechanical drive units. Although load carrying capability will be somewhat reduced, essentially the overall plant requirements are maintained. Occasions may arise when deposits form on the internal parts of steam...
Wind, one of the lowest cost renewable energy resources, would be very likely to provide a large part of the renewable energy developed under any national program using these two support mechanisms. Since the best wind resource is in the upper Great Plains region, it is reasonable to conclude that...
This paper summarizes on specific areas covered by the monitoring and evaluation of the Blyth offshore wind farm project. The purpose of the paper is to explain the evaluation and review of the practical aspects of installation, access, operation and maintenance of the first UK offshore wind farm. The principle...
Most currently proposed tidal stream turbine concepts are based either on fixed bottom-cantilevered mountings or on tethered floating devices. For the 70% of the available UK resource that occurs in waters of 48m depth or more ETSU estimate, neither of these concepts is likely to be practicable: fixed bottom mounts...
Large wind farms are to be expected in the coming decades. The paper discusses about farms of for example 20 times 20 turbines or larger. Of course it is of utmost importance to be able to predict the production of such farms accurately. However, little is known on cumulative effects...
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