Showing papers on "Paddle published in 2016"

Unmanned aerial vehicle

Abstract: The invention relates to an unmanned aerial vehicle which comprises an upper body part, a middle body part and a lower body part, wherein the upper body part is composed of at least one machine arm; at least one paddle is arranged on each machine arm; each paddle is connected to the corresponding machine arm through a corresponding motor; the middle body part is composed of a damping component; the lower body part is composed of a casing; and a controlling component which is connected with the motors are arranged in the casing and is used for controlling the motors to drive the corresponding paddles to rotate. The unmanned aerial vehicle is in a new unmanned aircraft layout manner, and breaks the conventional flight attitude of the unmanned aerial vehicle. According to the unmanned aerial vehicle, vibration generated by the upper body part can be greatly weakened and even to zero through the damping component of the middle body part, and thus flight is more balance.

Contribution of Leg-Muscle Forces to Paddle Force and Kayak Speed During Maximal-Effort Flat-Water Paddling.

Abstract: The purpose was to investigate the contribution of leg-muscle-generated forces to paddle force and kayak speed during maximal-effort flat-water paddling. Five elite male kayakers at national and international level participated. The participants warmed up at progressively increasing speeds and then performed a maximal-effort, nonrestricted paddling sequence. This was followed after 5 min rest by a maximal-effort paddling sequence with the leg action restricted--the knee joints "locked." Left- and right-side foot-bar and paddle forces were recorded with specially designed force devices. In addition, knee angular displacement of the right and left knees was recorded with electrogoniometric technique, and the kayak speed was calculated from GPS signals sampled at 5 Hz. The results showed that reduction in both push and pull foot-bar forces resulted in a reduction of 21% and 16% in mean paddle-stroke force and mean kayak speed, respectively. Thus, the contribution of foot-bar force from lower-limb action significantly contributes to kayakers' paddling performance.

Lubricant sensitivity in function of paddle movement in the forced feeder of a high-speed tablet press.

Abstract: Context: The negative impact of magnesium stearate (MgSt) on the hardness of tablets is a well-known phenomenon, but the influence of paddle movement in the forced feeder on the lubricant effect during tablet compression is often neglected.Objective: The purpose of this research was to investigate the influence of paddle speed in the forced feeder on tablet tensile strength (TS).Materials and methods: Mixtures of microcrystalline cellulose (MCC) and MgSt (0.5%) were blended using different methods (low & high shear). After blending, the formulations were compressed into tablets. All parameters of the tableting cycle were kept constant except the speed of the paddles in the forced feeder.Results and discussion: The blending technique affected the sensitivity of the formulation to the paddle speed. The TS of pure MCC tablets did not change in function of paddle speed, while tablets prepared by low shear mixing became softer at higher paddle speed. The TS of tablets manufactured using the high-shear ...

Investigation on novel raceway pond with inclined paddle wheels through simulation and microalgae culture experiments

Abstract: The open raceway ponds are nowadays the most used large-scale reactors for microalgae culture. To avoid the stacking of microalgae, the paddle wheels are the most widely used to circulate and mix the culture medium. In this paper, a numerical simulation using computational fluid dynamics (CFD) was used to investigate the hydrodynamic characteristics of open raceway ponds with different types of paddle wheels (the traditional paddle wheels and the novel paddle wheels with specially inclined angle of the blades). The particle image velocimetry (PIV) was used to validate the reliability of the CFD model. The CFD simulation results showed that the novel raceway pond with 15° inclined angle of the blades had the best mixing efficiency under the same power consumption. Lastly, the results of microalgae culture experiments showed that the growth rates of Chlorella pyrenoidosa in the novel raceway pond with 15° inclined angle of the blades were higher than those in the traditional reactor. The results of the culture experiments and CFD simulations were identical with each other. Therefore, a novel paddle wheel with 15° inclined angle of the blades was obtained for better microalgae cultivation.

Methods and apparatus for magnetic sensor having non-conductive die paddle

Abstract: Methods and apparatus to provide an integrated circuit package having a conductive leadframe, a non-conductive die paddle mechanically coupled to the leadframe, and a die disposed on the die paddle and electrically connected to the leadframe. With this arrangement, eddy currents are reduced near the magnetic field transducer to reduce interference with magnetic fields.

Halting method and system for fan in extreme state

Abstract: The invention provides a halting method and system for a fan in an extreme state, and relates to the field of fan control The method provided by the invention comprises the steps that a paddle collecton speed changing manner is adopted, before gust halt, firstly, a pitch angle of a wind wheel is adjusted at a high paddle collecton speed, so as to avoid the problem that the wind wheel overspeeds; and then, the pitch angle of the wind wheel is adjusted at a low paddle collecton speed, so as to avoid the problem that the overall mechanical load of the fan is too large Through the adoption of the control method, the fan can avoid the situation that the fan overspeeds and flies and the situation that the fan structure breaks due to the fact that the mechanical load of the fan is too large at the same time, and the safety of the fan during the gust halt process is improved

Three-dimensional full-field deformation measurement method of paddle

Abstract: The invention discloses a three-dimensional full-field deformation measurement method of a paddle. The method comprises the following steps of 1), designing and manufacturing an electronic speckle; 2), forming a camera set by means of multiple three-dimensional video units; 3) calibrating the inner diameter and the outer diameter of the camera set by means of a calibrating board with a coding mark point; 4) acquiring an image, realizing image grouping, and performing imaging matching on the grouped image; 5), performing three-dimensional analysis on the image which is matched in the step 4) by means of the inner parameter and the outer parameter of the camera set obtained in the step 3), and obtaining a three-dimensional point cloud of each paddle surface; and 6) based on the three-dimensional point cloud of each paddle surface obtained in the step 5), fitting the profile of the paddle, and obtaining three-dimensional full-field deformation of the paddle. The three-dimensional full-field deformation measurement method can be used for measuring anisotropic three-dimensional full-field dynamic deformation of the paddle and furthermore can be used for obtaining various movement parameters of the paddle. The three-dimensional full-field deformation measurement method has advantages of comprehensive measured data, high measurement accuracy, effective settlement for interference in complicated working conditions, and reliable data in paddle movement process.

Command input device for a game pad, and game pad equipped with such a device

Abstract: A command input device for a game pad is provided, the device including at least one paddle, having a fixing part, and a manipulation part, the manipulation part is positioned between the fixing part and a lateral edge of the game pad, and the paddle is curved between the fixing part and the manipulation part so that the paddle becomes further away from the rear face on the side of the manipulation part. Also provided is a game pad equipped with at least one such command device.

An Optimal Trajectory Planner for a Robotic Batting Task: The Table Tennis Example

Abstract: This paper presents an optimal trajectory planner for a robotic batting task . The specific case of a table tennis game performed by a robot is considered. Given an estimation of the trajectory of the ball during the free flight, the method addresses the determination of the paddle configuration (pose and velocity) to return the ball at a desired position with a desired spin. The implemented algorithm takes into account the hybrid dynamic model of the ball in free flight as well as the state transition at the impact (the reset map). An optimal trajectory that minimizes the acceleration functional is generated for the paddle to reach the desired impact position, velocity and orientation. Simulations of different case studies further bolster the approach along with a comparison with state-of-the-art methods.

Portable unmanned aerial vehicle

Abstract: The utility model discloses a portable unmanned aerial vehicle, including fuselage, a 2 -8 horn rotation axis, a 2 -8 horn, 4 -16 piece paddle, a 2 -8 paddle rotary part, its characterized in that: every horn one end is fixed on the fuselage through a rotation axis, and a 2 -8 horn symmetric distribution is on the fuselage, every horn other end installation paddle rotary part, every paddle tail end is equipped with the round hole, installs two paddles on every paddle rotary part. The utility model discloses to compare the operation simpler with four rotor unmanned aerial vehicle of other brands with equal -volume and performance, takes in more easily, more conveniently carries. It is long wide similar with A4 paper in folding back, and though be go out at ordinary times or go out that the tourism can all follow one's bent put individual knapsack, suitcase and che nei into, also can be lightly freely even holding. The injury of external force is avoided to better protection horn, blade and the foot rest of folding state ability simultaneously.

Screw, power suit and unmanned vehicles

Abstract: The utility model provides a screw, it includes the paddle, wherein distance on the paddle the centre of turning circle's of screw distance does the slewing radius's of screw 46875% department, the angle of attack of paddle is 2614 25 degrees, distance on the paddle the centre of turning circle's of screw distance does the slewing radius's of screw 6250% department, the angle of attack of paddle is 21 25 degrees, distance on the paddle the centre of turning circle's of screw distance does the slewing radius's of screw 78125% department, the angle of attack of paddle is 1759 25 degrees The utility model provides an adopt the power suit and the unmanned vehicles of above -mentioned screw

Force balancing in mammographic compression.

Abstract: Purpose: In mammography, the height of the image receptor is adjusted to the patient before compressing the breast. An inadequate height setting can result in an imbalance between the forces applied by the image receptor and the paddle, causing the clamped breast to be pushed up or down relative to the body during compression. This leads to unnecessary stretching of the skin and other tissues around the breast, which can make the imaging procedure more painful for the patient. The goal of this study was to implement a method to measure and minimize the force imbalance, and to assess its feasibility as an objective and reproducible method of setting the image receptor height. Methods: A trial was conducted consisting of 13 craniocaudal mammographic compressions on a silicone breast phantom, each with the image receptor positioned at a different height. The image receptor height was varied over a range of 12 cm. In each compression, the force exerted by the compression paddle was increased up to 140 N in steps of 10 N. In addition to the paddle force, the authors measured the force exerted by the image receptor and the reaction force exerted on the patient body by the ground. The trial was repeated 8 times, with the phantom remounted at a slightly different orientation and position between the trials. Results: For a given paddle force, the obtained results showed that there is always exactly one image receptor height that leads to a balance of the forces on the breast. For the breast phantom, deviating from this specific height increased the force imbalance by 9.4 ± 1.9 N/cm (6.7%) for 140 N paddle force, and by 7.1 ± 1.6 N/cm (17.8%) for 40 N paddle force. The results also show that in situations where the force exerted by the image receptor is not measured, the craniocaudal force imbalance can still be determined by positioning the patient on a weighing scale and observing the changes in displayed weight during the procedure. Conclusions: In mammographic breast compression, even small changes in the image receptor height can lead to a severe imbalance of the applied forces. This may make the procedure more painful than necessary and, in case the image receptor is set too low, may lead to image quality issues and increased radiation dose due to undercompression. In practice, these effects can be reduced by monitoring the force imbalance and actively adjusting the position of the image receptor throughout the compression.

Orthopedic joint distraction device

Abstract: An orthopedic distraction device is provided. The orthopedic distraction device includes a first upper paddle for engaging a first bone of a joint, a lower paddle for engaging a second bone of the joint and a displacement mechanism. The displacement mechanism includes a drive assembly operable to move the upper paddle relative to the lower paddle, The lower paddle is releasably connected to the displacement mechanism.

Analysis of motion during the breast clamping phase of mammography

Abstract: Objective:To measure paddle motion during the clamping phase of a breast phantom for a range of machine/paddle combinations.Methods:A deformable breast phantom was used to simulate a female breast. 12 mammography machines from three manufacturers with 22 flexible and 20 fixed paddles were evaluated. Vertical motion at the paddle was measured using two calibrated linear potentiometers. For each paddle, the motion in millimetres was recorded every 0.5 s for 40 s, while the phantom was compressed with 80 N. Independent t-tests were used to determine differences in paddle motion between flexible and fixed, small and large, GE Senographe Essential (General Electric Medical Systems, Milwaukee, WI) and Hologic Selenia Dimensions paddles (Hologic, Bedford, MA). Paddle tilt in the medial–lateral plane for each machine/paddle combination was calculated.Results:All machine/paddle combinations demonstrate highest levels of motion during the first 10 s of the clamping phase. The least motion is 0.17 ± 0.05 mm/10 s (n ...

Snowmobile with leaning capability and improvements therefor

Abstract: A snowmobile has a suspension with a spring. The spring has a central loop portion and an elastomeric bushing disposed in the central loop portion. A limiting cable is disposed adjacent to the spring. The snowmobile also has a rear snowmobile suspension with a torsion link structure. A control arm is pivotally connected to a first end of the torsion link structure. A wheel assembly is pivotally connected to a second end of the torsion link structure. A first slide rail is attached to the wheel assembly with a sliding mechanism. A track around the rear snowmobile suspension has a paddle oriented substantially perpendicular to the track. A first gripping element is disposed on the face of the paddle.

Enhancing the optical lever sensitivity of microcantilevers for dynamic atomic force microscopy via integrated low frequency paddles.

Abstract: A method is presented to enhance the optical lever sensitivity in dynamic atomic force microscopy (AFM) by nearly an order of magnitude over a wide frequency bandwidth. This is achieved by fabricating or releasing a paddle with a soft hinge close to the free end of the AFM microcantilever such that the paddle resonance frequency is well below the fundamental resonance frequency of the microcantilever. We show a significant increase in signal to noise ratio when cantilever motion is observed at the paddle for AFM systems that are not limited by thermal noise. Also, any effects due to the excitation of the second eigenmode were decoupled by locating the paddle at the node of the second eigenmode. We use these probes for higher harmonic imaging in amplitude modulated AFM (AM-AFM) on a standard polymer blend made of polystyrene and low density polyethylene. We demonstrate significantly improved contrast in higher harmonic images when observing cantilever motion at the paddle. Thus this microcantilever design can improve significantly conventional cantilever performance for dynamic AFM and is compatible with low-cost, high yield microfabrication processes.

Fast dismouting oar seat device of many rotor crafts

Abstract: The utility model discloses a fast dismouting oar seat device of many rotor crafts, including mounting components with install the sliding seat subassembly in mounting components, mounting components includes a motor, and the upper end of motor is provided with two first screw holes, the upper end installation fixing base of motor, the both sides face of fixing base all sets up a constant head tank, the sliding seat subassembly includes a sliding seat, and the up end of sliding seat is provided with the second screw hole, and the upper end that is located the sliding seat sets up a paddle, the upper end of paddle sets up a paddle pressure disk The utility model discloses under the condition with the help of other instruments not, can realize paddle and driving motor's assembly or separation fast, improved work efficiency greatly, and the oar seat adopts circular structural design, effectively guarantee the motion equilibrium when driving motor rotates, avoid producing because of weight distributes the uneven vibrations that lead to to extension driving motor's life improves having a smooth flight nature of paddle, and overall structure is simple, with low costs, workable

Intermittent quantitative delivery system and control method thereof

Abstract: The invention discloses an intermittent quantitative delivery system and a control method thereof. The intermittent quantitative delivery system comprises a storage bin, a first motor, a second motor, a feeding system, a first ratchet paddle, a second ratchet paddle, a weighing hopper, a base, a control system, a first driver for driving the first motor to work, and a second driver for driving the second motor to work; the first ratchet paddles and the second ratchet paddles are mounted in the storage bin orderly from top to bottom; the feeding system communicates with a feeding hole in the top of the storage bin; an opening-adjustable discharge hole is formed in the bottom of the storage bin; an output shaft of the first motor is connected with a driving shaft of the first ratchet paddle, while an output shaft of the second motor is connected with a driving shaft of the second ratchet paddle; the control system comprises a man-machine interaction system, a controller, and a weighing sensor for measuring the weight of the weighing hopper; an input end of the controller is connected with an output end of the weighing sensor. The intermittent quantitative delivery system is capable of implementing quantitative feeding efficiently and accurately with a simple structure.

Accessory mounting system for a stand up paddle board

Abstract: Accessory mounting systems for stand up paddle boards are disclosed. In one example, the accessory mounting system includes a mounting plug secured to a stand up paddleboard, a accessory plate secured to the mounting plug, and one or more accessories secured to the accessory plate. In other examples, the accessory plate is provided with an adhesive backing and can be mounted and secured to the stand up paddle board, thereby allowing the accessory mounting system to be used on boards not having mounting plugs and/or at locations where mounting plugs are not present. In yet another example, a mounting track is provided instead of a accessory plate such that one or more accessories, such as fishing rod holder, can be slidably mounted on the stand up paddle board.

The physics of juggling a spinning ping-pong ball

Abstract: Juggling a spinning ball with a ping-pong paddle represents a challenge both in terms of hand-eye coordination and physics concepts. Here, we analyze the ping-pong ball's motion, and explore how the correct paddle angle relates to the ball's spin and speed, as it moves vertically up and down. For students, this requires engaging with concepts like momentum, angular momentum, free-body diagrams, and friction. The activities described in this article include high-speed video motion tracking of the ping-pong ball and the investigation of the frictional characteristics of the paddle. They can be done in a physics lab or at home, requiring only inexpensive or commonly used equipment, and can be undertaken by high school or college students.

Combined stirring paddle for strengthening fluid mixing

Abstract: The invention aims to provide a combined stirring paddle low in production cost, good in stirring effect and capable of running stably and continuously for a long time, in particular to a combined stirring paddle for strengthening fluid mixing. The combined stirring paddle comprises a stirring shaft, a plurality of rigid blades, a plurality of flexible vanes and a plurality of flexible steel wires; one end of the stirring shaft is connected with an output shaft of a prime motor while the other end is fixedly provided with a connecting buckle; two nodes are arranged on the stirring shaft; the rigid blades are connected on the nodes in a radiating manner; the flexible vanes are strip shaped; two ends of each flexible vane are respectively connected with the rigid blades located at the different nodes; one ends of the flexible steel wires are connected with the corresponding flexible steel wires while the other ends of the same are connected with the stirring shaft through the connecting buckle. Compared with the prior art, the combined stirring paddle has the advantages that fluid mixing efficiency can be improved reliably, and good mixing effect can be realized under lower rotating speed.

Heated hair paddle

Abstract: A heated hair paddle includes a novel bristle arrangement which establishes a large surface area for contacting the length of hair during grooming while also creating a serpentinous path through which the length of hair must traverse thereby enhancing the grooming effect on the hair.

Oil moves four rotor unmanned aerial vehicle rotor - control system of displacement

Abstract: The utility model provides an oil moves four rotor unmanned aerial vehicle rotor - control system of displacement, it includes toggle, connection rotor shaft and the double -layered rotor head of oar, the oar that connects displacement rocking arm and paddle presss from both sides, connects the displacement pull rod of displacement outer loop, displacement sliding ring, the interior ring sum displacement rocking arm of displacement to and the steering wheel control operating rod of connection displacement outer loop and steering wheel dish, on the toggle was fixed in rotor shaft, steering wheel dish and steering wheel support were connected to the steering wheel, and the rotatory manipulation of steering wheel has realized the manipulation of rotor pass to the paddle through steering wheel dish, steering wheel control operating rod, displacement outer loop, displacement sliding ring, displacement inner ring, displacement pull rod, displacement rocking arm and oar clamp on, rotor shaft passes through the bearing and connects on the rotor shaft support, the rotary motion of the effect of rotor shaft support for supporting the rotor system, and the fixed steering wheel support of installation also plays the effect of toggle simultaneously, avoids steering wheel control operating rod and displacement outer loop rotatory along with the rotor. The utility model discloses the oily manipulation problem of moving four rotor unmanned aerial vehicle of displacement has mainly been solved.

Oxygenation formula remote control paddle is thrown and is raised ship

Abstract: The utility model discloses an oxygenation formula remote control paddle is thrown and is raised ship, including hull (1), hull (1) front end is fixed to be provided with to throw and is raised device (2), and looks remote site bilateral symmetry is provided with paddle (3), and paddle (3) of both sides still are provided with wireless controller (5), storage battery (6) respectively through direct current motor (4) drive on hull (1), and the rotation of direct current motor (4) control paddle (3) is passed through in wireless controller (5), and storage battery (6) provide direct current motor the working power supply of (4), the utility model discloses effectively solved the unsuitable crab shrimp breed of the mode of feeding that the machine of raising was thrown to the tradition, owing to aquaculture environment's reason, pasture and water are more, also do not suit the problem that embarkation shed.

Air -flow stirring device

Abstract: The utility model relates to a stirring apparatus, concretely relates to air -flow stirring device, air -flow stirring device includes container and air pump the inside of container is equipped with rotatory trachea, stretch out on rotatory tracheal top the container inside and through the linkage unit with the air pump is connected, even there is at least a set of stirring paddle leaf rotatory tracheal bottom, stirring paddle leaf is cavity stirring paddle leaf there are a plurality of ventholes with one side equipartition on cavity stirring paddle leaf's the direction of rotation. The utility model provides an air -flow stirring device has energy -conservation, mixed effectual, reduces the advantage that liquid splashes.

Design of a high-mobility multi-terrain robot based on eccentric paddle mechanism

Abstract: Gaining high mobility on versatile terrains is a crucial target for designing a mobile robot toward tasks such as search and rescue, scientific exploration, and environment monitoring. Inspired by dextrous limb motion of animals, a novel form of locomotion has been established in our previous study, by proposing an eccentric paddle mechanism (ePaddle) for integrating paddling motion into a traditional wheeled mechanism. In this paper, prototypes of an ePaddle mechanism and an ePaddle-based quadruped robot are presented. Several locomotion modes, including wheeled rolling, legged crawling, legged race-walking, rotational paddling, oscillating paddling, and paddle-aided rolling, are experimentally verified on testbeds with fabricated prototypes. Experimental results confirm that paddle’s motion is useful in all the locomotion modes.