196 results about "Double pendulum" patented technology

A golf swing analysis device includes a joint force calculation section and a torque extraction section. The joint force calculation section generates a double pendulum model that includes a first link that corresponds to an upper part of a body of a golfer, a second link that corresponds to a golf club, and a joint that links the first link and the second link, and calculates a joint force applied to the joint along with a swing motion using an acceleration measured by an inertial sensor attached to the golf club. The torque extraction section extracts a torque that causes the second link to make a rotational motion around a first axis from the joint force.

The invention discloses a method for detecting the linkage accuracy of a C-shaft of a multi-shaft linkage double-pendulum numerical control milling machine. The method comprises the following steps that a standard linkage ball is installed on a machine tool spindle, and the working length L and the linkage ball diameter D of the standard linkage ball are set in a machine tool system; a digital display dial indicator used for data collection and data output is arranged on a machine tool bed frame, and after a measuring head of the digital display dial indicator makes contact with the standard linkage ball, the measuring head is pressed inward by a certain distance d, and the current position of the digital display dial indicator is reset to zero; a machine tool RTCP motion mode is switched on, and the C-shaft is made to rotate around the center of the standard linkage ball; the digital display dial indicator is used for collecting displacement deviation delta 1 generated between the standard linkage ball and the measuring head in the rotation process, and the value of the displacement deviation delta 1 at a certain rotation angle is the linkage accuracy of the C-shaft at the angle. The method for detecting the linkage accuracy of the C-shaft of the multi-shaft linkage double-pendulum numerical control milling machine is more rapid and effective in data collection and data analysis, and can serve as a basis for accuracy compensation of a C-shaft of a follow-up machine tool; a large number of trial cuts does not need to be conducted, a three-coordinate measuring instrument does not need to be arranged for special inspection, and therefore cost is low and efficiency is high.

The invention discloses a numerical control processing machine tool and processing method special for a double-power unit propeller of a large ship. The machine tool comprises an upper and a lower power unit system; the upper power unit system comprises an upper base, a mobile column, a lead screw nut mechanism, a motor, a guiding rail and an A / C direct-drive double pendulum power unit; the lower power unit system comprises a lower base, a lead screw nut mechanism, a motor, a guiding rail, a B2 axle assembly and a second A / C direct-drive double pendulum power milling unit. The processing method comprises the following steps that the upper surface of the propeller is cut and processed firstly, and then the lower surface is cut and processed, the operation is repeated until all impellers are processed; alternatively, the upper surface of the propeller can be cut and processed until the upper surfaces of all impellers are processed, and then the lower surface is cut and processed until the lower surfaces of all impellers are processed; the processing of the whole propeller curved surfaces such as impeller pressure surface, impeller suction surface, and propeller hub and the like is completed in one time of assembly, so that the troubles of turning over and reassembling of the large propeller can be saved, thus processing efficiency is improved and repositioning error is reduced.

The invention discloses a device and method for testing the power capability of composite explosives. The device for testing the power capability of the composite explosives is composed of winches, supports, support supporting rods, bearing bases, rotary shafts, swing arms, pendulum bobs, pendulum bob protruding teeth, a one-way limiter and angulometers. Before a test, explosive samples to be tested are prepared through special pressing molds, the samples to be tested are placed in inner cavities of the pendulum bobs and detonated through detonators, after detonation, the two pendulum bobs swing circumferentially around the rotary shafts under the limitation of the swing arms, the pendulum bobs are controlled by the one-way limiter and the pendulum bob protruding teeth to swing to the highest point and then stay still, the angulometers are used for measuring the swing angles of the pendulum bobs, and the power capability of the composite explosives after detonation is calculated and measured through the swing angles of the two pendulum bobs. According to the device and method, the improvement is made on the basis of a traditional ballistic trajectory mortar method, the conversion efficiency for converting chemical energy into mechanical energy of detonation can be improved through the two-pendulum-bob structure, and therefore the test result and the quantitative expression of the power capability of the composite explosives are more accurate.

An under-actuated pendulum control experimental apparatus relates to an under-actuated control experimental apparatus applying to academic researches for control theory and control engineering discipline and electron and transmission discipline, is used for solving the problems that experimental apparatus, which is used for the academic researches of non-linear control theory in higher education institutions and scientific institutions, still stays at numerical simulation level, appropriate material system is absent and the theory is disconnected with the practice. The upper I / O terminal and drive I / O terminal on a two-shaft motion control card are respectively connected with the I / O terminal of an upper computer and the I / O terminal of a DC motor driver. The control output terminal of the DC motor driver is connected with the control input terminal of a DC servo motor. The signal output terminals of the DC servo motor and an angle detector is connected with the signal input terminal of the two-shaft motion control card. The output shaft of the DC servo motor is connected with the input shaft of an under-actuated pendulum system by a shaft coupling. The input drive torque of the input shaft of the under-actuated pendulum system is delivered to a double-pendulum output shaft through a synchronous drive system.