When it comes to hydraulic equipment, noise apparently does matter—enough so that many design engineers would be willing to pay extra to reduce sound levels. In a recent Design News survey, 74% of the respondents say that they are willing to shell out dough to delete decibels their hydraulic applications. Most important? Those environments that involve people working around hydraulics for a significant amount of time. OSHA's workplace requirement is 70 dBA.
NASA and Boeing developed a huge, carbon composite cryogenic fuel tank for deep space missions, and started testing it last month. The 18-ft cryotank will enable heavy-lift launch vehicles to send both humans and robots into deep space.
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