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(continued from previous page) robust hardware. Noise in a duct, from a fan for instance, is picked up by the first microphone that sends a signal to the controller, which interprets sig- nal, and phase shifts the signal and sends an amplified signal to the loudspeaker. The speaker injects the "anti- noise" precisely at the correct moment, the anti-noise intercepts High Performance ...Fast return 'CASTROL provide the highest possible standard in lubricants and service. The combination of high performance lubricants, extensive supply network and rapid lubricant condition monitoring programme, ensure the Fast Ferry operator receives the support needed in maintaining rigorous schedules and rapid turnarounds. CASTROL are the lubricants specialists.' For further information contact: Castrol North America - Marine Division, 1500 Valley Road, Wayne, NJ 07470 Telephone: (201)633-2200 Fax: (201)633-7959 companies considers ANC a strate- gic technology and has therefore invested in various development programs since 1991. As a result of these efforts, ANC systems from Digisonix are now being applied both as retrofit measures and as active components of originally manufactured equipment such as air handling units (AHU) and, in the near future, large baffle silencers for heavy duty fans. Pf?®(»)®feD®nC : GL To Manage Diesel Exhaust Gas Emission Reduction Program Germanischer Lloyd (GL) has been given the overall project man- agement of a three-year, industry- wide research program to reduce exhaust gas omissions from marine diesel engines. The pro- ject, dubbed CLEAN (Clean and Low soot Engine with Advanced techniques for NOx reduction) is being sponsored by the German Federal Ministry for Education, Science, Research and Technology (BMBF). The aim is to drastically reduce the visible emissions of soot and particles in exhaust gas, and to decrease the levels of nitrogen oxide, without increasing fuel con- sumption. Thirteen leading German ship diesel manufacturers, as well as subcontractors, universities and research institutions, are involved in the joint project. The following organizations are involved in the project: Research Association for Combustion Engines; Germani- scher Lloyd; ABB Turbomaschinen; AVL Graz; Dieselmotorenwerk Vulkan; FMC — Fiedler Motoren Consulting; Krupp MaK; MAN B&W Diesel; Motoren-Werke Mannheim; Siemens Energieer- zeugung; SKL Motoren-und Systemtechnik; TT-Line; and Woodward Governor. MAN B&W Adds To MC Program Of Super-long- Stroke Engines MAN B&W Diesel has introduced the S70MC-C, S60MC-C and S50MC-C type super-long-stroke engines to its 1996 MC program. The units are compact versions of their predecessors — S70MC, S60MC and S50MC — with the same cylinder bores, but increased outputs based on a mean effective pressure of 19 bar. The character- istics of these engine types are reduced cylinder distance and lower weight, compared with the previous type, and a stroke/bore ration of four to one. Also, MAN B&W Diesel has introduced the S46MC engine which, by providing an additional bore size option, will reportedly enhance the application possibili- ties in the market segment so far covered by the S42MC and S50MC types. The S46MC shares the same design features as the com- pact engines. An additional feature in the 1996 MC program is that the L70MC is reportedly available with a higher rating, based on a mean effective 18 bar, adding approximately six percent to its power output. For more information on MAN B&W Circle 136 on Reader Service Card the fan noise the two pressure waves "collide" and cancel each other. Residual noise is picked up by the second microphone, and this signal is used by the controller to fine- tune the system, particularly in respect to changes in the air flow, temperature and characteristics of the noise. As a major supplier to the mar- itime industry, the ABB group of Circle 247 on Reader Service Card 14 Maritime Reporter/Engineering News
