taintytothevalueofg.aconfigurationwithfourattractingmaesindeterminationofnewtoniangravitationalcotantgbythetime-of-swingmethodisproposed.onepairofattractingmaesisputoutsidethetwotestmaesandanotherpaironeisputiide.becausethesignalsoftwopairsofattractingmaeswillbesuperposedwhilethenoisesduetotheuncertaintyofthetestmaesseparationwillbecompeated,thereexistsanoptimumseparationbetweenthetestmaes,inwhichtherequirementofmeasuringthisseparationcanbereducedbyafactorofabout400.however,thisisattheexpeeofahigherprecisionrequirementindeterminingtheseparatiobetweentheattractingmaes.fortunately,wecandeterminethisseparationwithhighprecisionbymeaofarotatinggaugeblockmethod.wehaveperformedaprototypeexperimenttodeterminetheseparationbetweentwoher
icalattractingmaeswithuncertaintyof,andtheimprovedexperimentcanreachtheprecisionof.basedonthefirststepexperiment,ournextgoalisdetermininggwitharelativeuncertaintyof10m.
insummary,themainpointsofthisthesisare:determininghust-99gvaluewithalongperiodandhighqtorsionpendulum;aperiodfittingmethodisproposedtodeterminethefundamentalfrequencyofaphysicaloscillator,whichmakesthefittingproceoptimizetheperiodfitattheexpeeofaleevaluationoftheotherparameterssuchastheamplitudeandthephase;thethermoelastic,anelasticandnonlinearpropertiesofthetorsionpendulumwerestudied;anoptimumconfigurationwithfourattractingmaesinthedeterminationofnewtoniangravitationalcotantgwiththetime-of-swingmethodisproposed.
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