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4 results about "Thin shells" patented technology

Thin shell movable powder pellet solid engine modal parameter test method

ActiveCN106338398AImprove stabilityEasy to operateEngine testingModal testingThin shells
The invention provides a thin shell movable powder pellet solid engine modal parameter test method. The method comprises a step of using engine end part axial excitation, a step of uniformly distributing measuring points at an engine axial direction along a quadrant direction, a step of testing all transfer functions in one time, a step of using a least square frequency domain method to fit a modal parameter, and a step of judging a modal test correctness in the whole with the combination of vibration characteristics. According to the test method, the technical problems of difficult modal parameter rank determination, poor modal frequency repeatability and easy change of a vibration type in the modal parameter test of the thin shell movable powder pellet tactical solid motor are solved.
Owner:TIANJIN AEROSPACE RELIA TECH +2

Cultivation method for early-maturing thin-shelled walnut applicable to hilly and mountainous areas

InactiveCN104756812AWeight increaseImprove appearance qualityCultivating equipmentsPlant protectionFertilizerThin shells
The invention discloses a cultivation method for an early-maturing thin-shelled walnut applicable to hilly and mountainous areas. The method comprises the following steps: selecting the thin-shelled walnut of the hilly and mountainous area with slope of 20-30 degrees to flatly plan; cultivating young trees; scientifically picking buds; managing fertilizer and water; applying mushroom stalks before the young trees sprout; pruning and pulling branches; remaining 3-4 robust new buds before germination of the young trees, and pruning all the rest buds; performing management of flowers and fruits, wherein the fertilizer and water management is taken into consideration before and after blooming of the third year after planting of the young trees. According to the method, the single fruit weight and the appearance quality of the thin-shelled walnut can be improved, the mouthfeel of the thin-shelled walnut is improved, and the content of walnut oil in the fruit is improved by 35 percent; the attack of diseases and pests of fruit peels is reduced, meanwhile the content of protein of the thin-shelled walnut is also improved, and the fruit is full and thin-shelled.
Owner:DONGHAI HEILONGTAN ECOLOGICAL AGRI DEV CO LTD

Automatic alignment parallel seal welding method for microelectronic packaging in high vacuum state

The invention discloses an automatic alignment parallel seal welding method for microelectronic packaging in a high vacuum state, and solves the problem of how to complete high-quality parallel seal welding of a cover plate and a tube shell of a thin-shell device at low cost in a vacuum environment. A floating parallel welding wheel support is arranged, two parallel welding wheels on the support are pressed on parallel welding seams between a cover plate and a tube shell in a floating mode, weights are arranged at the top end of the parallel welding wheel support, and the welding pressure of the parallel welding wheels on the welding seams is adjusted by increasing or reducing the number of the weights. The adjustment of self-adaptive welding pressure in the welding process is realized; a shoulder-pole-shaped semi-square-shaped jacking frame body is arranged between a left parallel welding wheel support and a right parallel welding wheel support, the floating parallel welding wheel supports are lifted and lowered through jacking connection of an eccentric wheel to the semi-square-shaped jacking frame body, a tray conveying driving motor is installed outside a closed cavity, and conveying of trays in the cavity is completed at low cost; and the cover plate and the tube shell can be accurately aligned.
Owner:西北电子装备技术研究所
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