273 results about "Body dynamics" patented technology

A floating-body dynamic random access memory device may include a semiconductor body having a top surface and laterally opposite sidewalls formed on a substrate. A gate dielectric layer may be formed on the top surface of the semiconductor body and on the laterally opposite sidewalls of the semiconductor body. A gate electrode may be formed on the gate dielectric on the top surface of the semiconductor body and adjacent to the gate dielectric on the laterally opposite sidewalls of the semiconductor body. The gate electrode may only partially deplete a region of the semiconductor body, and the partially depleted region may be used as a storage node for logic states.

The invention relates to a directional fracturing method in the coal mine and a fracturing permeability improvement outburst elimination device to ensure the coal-bed gas to release rapidly and continually in the coal mine. The method comprises the following steps: fracturing and drilling a bore on a preparing working face along the dip direction and strike direction of a coal bed, fixing a fracturing hole packer with an outer diameter matching with the pore diameter of a fracturing drilling bore into the fracturing drilling bore; connecting a fluid reservoir with a sand mixing machine, connecting the sand mixing machine with a fracturing pump package, and then connecting the fracturing pump package with the fracturing drilling bore; pumping formation fracturing fluid and proppant into the fracturing drilling bore to fracture the formation and sealing the fracturing drilling at above formation fracturing pressure, and completing directional fracturing permeability improvement outburst elimination in the coal mine, thus ensuring that the coal-bed gas discharges rapidly and continually relatively and solving the problems that drainage in low air permeability coal bed can only influence a limited range and the drainage attenuation period is short, improving the drainage rate by over 50% on primary base, decreasing the coal body dynamic phenomenon after fracturing and reginal stress influenced by fracturing, and having a significant effect for eliminating outburst.

Single transistor floating body dynamic random access memory (DRAM) cells include a semiconductor substrate and a barrier layer on the semiconductor substrate and a recess channel transistor on the barrier layer. The recess channel transistor includes a source region of a first conductivity type, a drain region of the first conductivity type spaced apart from the source region and a floating body of a second conductivity type between the barrier layer and the source region and the drain region. The floating body includes a recess region between the source region and the drain region. Methods of forming single transistor floating body dynamic random access memory (DRAM) cells are also provided.

The invention provides a device for monitoring heart rate and physical state. Sensors are mounted on a waistband, and the device comprises a data acquisition module, an FPGA (Field-Programmable Gate Array) control module and a DSP (Digital Signal Processor) data processing module. When the heart rate and the physical state of a subject change, the sensors collect body dynamic signals generated from the changes; the body dynamic signals generated from heartbeat after being processed by an analog, amplification and filter circuit and the body dynamic signals generated from changes of the physical state are output to the FPGA respectively through A / D (Analog / Digital) conversion circuits; the FPGA sends the body dynamic signals to the DSP to perform body dynamic signal processing by selectingone or multiple paths sensors, so as to calculate the heart rate and judge the physical state, and obtained data are fed back to the FPGA; and the FPGA sends the data to a monitoring center workstation by externally connecting a serial port with a communication module according to the information fed back by the DSP. The device provided by the invention can complete real-time, quick and accurate acquisition of multi-path signals to obtain physiological information of human body, and is combined with the wearing technology to realize long-term dynamic monitoring and identification of physiological information.

A flexible integrated test system of dynamic and static properties of a combination automotive body-in-white comprises a portal frame, a support restraint device, an adjustable concentrated force loading device, a torsion pendulum frame loading device and a measuring appliance assembly. The support restraint device for supporting the automotive body-in-white to be tested is fixed on the portal frame, the measuring appliance assembly is fixed on the portal frame by a support or directly fixed on the portal frame, the adjustable concentrated force loading device and the torsion pendulum frame loading device which loads stress on the automotive body-in-white to be tested are fixed on the portal frame or arranged on the peripheral side of the portal frame. The flexible integrated test system of dynamic and static properties of the combination automotive body-in-white has the advantages of simple and compact structure, reasonable layout, convenient operation, comprehensive function, wide application and good expansibility.

Computer simulation of the dynamics of rigid bodies interacting through collisions, stacks and joints is performed using a constraint-based system in which constraints are defined in terms of the positions of the bodies. Displacements caused by reaction forces necessary to ensure that the bodies comply with the position constraints can be calculated and can be done iteratively by updating equations defining the reaction forces and the displacements such that the computation time and memory resources required to perform the calculations is linearly dependent upon the number of bodies and the number of contacts and joints between the bodies. Computational requirements and memory requirements are reduced further by performing the calculations using vector operations.

A single transistor floating-body dynamic random access memory (DRAM) device includes a floating body located on a semiconductor substrate and a gate electrode located on the floating body, the floating body including an excess carrier storage region. The DRAM device further includes source and drain regions respectively located at both sides of the gate electrode, and leakage shielding patterns located between the floating body and the source and drain regions. Each of the source and drain regions contact the floating body, which may be positioned between the source and drain regions. The floating body may also laterally extend under the leakage shielding patterns, which may be arranged at outer sides of the gate electrode.

The invention provides an automobile chassis part weight reduction method based on multi-body dynamics and a topological optimization technology for the purpose of solving the problems that in existing automobile designs, a clear and feasible weight reduction method is unavailable, and an automobile chassis part still has a large weight reduction space. The automobile chassis part weight reduction method comprises the following steps: step 1, a finished automobile multi-body dynamic model and an object part finite element model of an object automobile type for weight reduction are established; step 2, multiple typical working conditions are selected, and an equivalent static load borne by an object part under each typical working condition is extracted; step 3, the equivalent static loads extracted in the step 2 are used as optimization boundary conditions, a flexibility weighting coefficient of each typical working condition is selected, the minimum total weighting flexibility serves as an objective function, and topological optimization is conducted with a constraint function including modality and stress; step 4, a threshold value is selected for a topological optimization result, and the position of a material to be removed is guided. The automobile chassis part weight reduction method based on the multi-body dynamics and the topological optimization technology combines a fatigue strength design with a static strength design, thereby having high reliability, portability and operability and being capable of effectively shortening the development cycle.

Embodiments relate to a two-transistor (2T) floating-body cell (FBC) for embedded-DRAM applications. Further embodiments pertain to a floating-body / gate cell (FBGC), which yields reduction in power dissipation, in addition to better signal margin, longer data retention, and higher memory density.

Computer simulation of the dynamics of rigid bodies interacting through collisions, stacks and joints is performed using a constraint-based system in which constraints are defined in terms of the positions of the bodies. Displacements caused by reaction forces necessary to ensure that the bodies comply with the position constraints can be calculated and can be done iteratively by updating equations defining the reaction forces and the displacements such that the computation time and memory resources required to perform the calculations is linearly dependent upon the number of bodies and the number of contacts and joints between the bodies.

The invention relates to a novel elliptical machine designed on orthopedic standards of body kinetics wherein the handles rotate 360 degrees and the foot pedals slide fore and aft and roll forwards and backwards as the user is exercising on the machine. This novel machine provides maximum efficacy and safety while a user is exercising, and does not limit the range of motion to the standard fixed elliptical motion of merely forward and backwards.

The invention discloses a balance point Halo orbit phasing orbit transfer method taking the time constraint into consideration, relates to a Halo orbit phasing orbit transfer method based on an earth-moon three-body dynamic model and belongs to the technical field of aerospace. According to the method, a dynamic equation is established under a restrictive three-body model formed by the earth, the moon and the star, and a Halo orbit near the point L2 is generated under an earth-moon rotation system; the Halo orbit initial phase position of a detector and the phase position difference needing to be changed are determined, and the optimal fuel phasing orbit meeting the phase position constraint condition and the transfer time constraint condition is obtained through an optimization algorithm with the initial anchoring time and transfer time as optimization variables; and the time difference delta t, the task Halo orbit or the upper limit tmax of the transfer time are adjusted according to the task which the detector needs to fulfill, and the orbit shadow detection avoiding task or the spatial intersection detection task of the detector on the Halo orbit is fulfilled. The method can obtain the optimal fuel phasing orbit meeting the phase position constraint condition and the transfer time constraint condition, and has the advantages of good convergence, high flexibility and the like.

An artificial multiped is constructed (either in simulation or embodied) in such a way that its natural body dynamics allow the lower part of each leg to swing naturally under the influence of gravity. The upper part of each leg is actively actuated in the sagittal plane. The necessary input to drive the above-mentioned actuators is derived from a neural network controller. The latter is arranged as two bi-directionally coupled chains of neural oscillators, the number of which equals twice that of the legs to be actuated. Parameter optimisation of the controllers is achieved by evolutionary computation in the form of a genetic algorithm.

Computer simulation of the dynamics of rigid bodies interacting through collisions, stacks and joints is performed using a constraint-based system in which constraints are defined in terms of the positions of the bodies.

The invention provides a method for reducing the self-excited vibration of a deep-hole processing boring bar, a vibration damper designed by utilizing the method for selecting parameters of the vibration damper has the advantages of simple structure and convenient detachment and can modify the parameters of the vibration damper of a power vibration damping boring cutter according to the needs at any time, the vibration damper consists of a vibration damping rod, damping fluid and rubber rings, and the vibration damper can effectively suppress the vibration during the processing. The method is realized through the following technical scheme: (1) establishing a theoretical model of a power vibration damping boring bar; (2) establishing a simulation model on the basis of the theoretical model and selecting the parameters of the vibration damper; (3) selecting finite element analysis software ANSYS and multi-body dynamics simulation software ADAMS for jointly establishing a dynamics simulation model of a vibration damping system and constituting a rigid-flexible coupling model; (4) designing a physical vibration damping boring bar model according to the models; and (5) selecting the vibration damping rod; and using the vibration damping rod with sheathed rubber rings at two ends and a boring bar inner hole for constituting the vibration damper, wherein the boring bar inner hole is arranged deep at one end and sealed by a plug, and the damping fluid is filled in the inner cavity of the boring bar inner hole.

The invention discloses a support vector machine and multi-body dynamics simulation-based high-voltage circuit breaker identification method. The method comprises the steps of building a three-dimensional model of a high-voltage circuit breaker, and calibrating and verifying the three-dimensional model; by changing size, material and property parameters of the three-dimensional model, performing analogue simulation on various faults of the high-voltage circuit breaker to obtain various corresponding mechanical property waveforms; performing waveform interception, mathematic morphological filtering and characteristic extraction processing on the mechanical property waveforms corresponding to the various faults to obtain an eigenvector sample set; based on a support vector machine and a one-to-many classification method thereof, training a classifier, and calculating the credibility of each classification; and inputting actually measured unknown fault eigenvectors to the training support vector machine, performing fault type identification to realize mechanical fault classification of the high-voltage circuit breaker, and finishing self-learning. According to the method, a large amount of physical simulation experiments do not need to be carried out; the faults of the high-voltage circuit breaker can be accurately identified; and the method has a self-learning function and a wide application prospect.

The invention belongs to the technology of aircraft follow-up loading and particularly relates to an aircraft rear body dynamic load follow-up loading testing device. The device is characterized in that the vibration table of the device is connected to a movable frame through rotary shafts at two ends of the vibration table, two vertical guide rails are disposed at each of the two ends of the movable frame and connected with a base, a hydraulic actuator cylinder is fixed on each of the two sides of the base, a piston rod is connected with the movable frame, a hydraulic locking device is mounted on the upper end cover of the hydraulic actuator cylinder, a hydraulic bulb vibration excitation rod is mounted on the movable core of the vibration table, the head of the hydraulic bulb vibration excitation rod is connected with an aircraft rear body, a displacement sensor is fixed on the static table surface of the vibration table, and a pull line is fixed with the aircraft rear body. The aircraft rear body dynamic load follow-up loading testing device has the advantages that the vibration table tracks the deformation of the aircraft rear body at any time to apply vibration excitation force to the same, the vibration excitation force is vertical to the tangent plane of an aircraft rear body loading point, static and dynamic loads are applied in a combined manner, and testing effect is close to actual situations.

The invention discloses a compound attitude control method of a grid rudder and a lateral jet. The compound attitude control method comprises the following steps: S1, carrying out interpolation calculation on original aerodynamic data to obtain an aerodynamic derivative; S2, calculating an elastic body dynamic coefficient according to the aerodynamic derivative and analyzing to obtain an elastic body stability index and a maneuverability index; S3, on the basis of aerodynamic performance analysis, carrying out correction network design based on the lateral jet and the grid rudder respectively; designing a corresponding notching filter so as to reduce influences of elastic vibration; in a designing process, considering the elastic body stability index and the maneuverability index; S4, on the basis of the correction network design and notching filter design, carrying out compound control distribution strategy design on two executing mechanisms including the grid rudder and the lateral jet according to control efficiency. According to the method provided by the invention, the grid rudder and the lateral jet are controlled in a compounding manner and stable control of attitudes of a launch vehicle is realized.

A single crystal semiconductor including a Wheatstone bridge circuit formed of an impurity diffusion layer whose longitudinal direction is aligned with a particular crystal orientation is connected to a rotating body. A rotating body dynamic quantity measuring device and a system using the measuring device are fatigue- and corrosion-resistant because of the single crystal semiconductor used and are not easily affected by temperature variations because of the bridge circuit considering a single crystal anisotropy.

The invention discloses a de-orbit braking closed circuit guidance method satisfying constrains on reentry angles and flying ranges. The guidance method comprises steps of firstly on the basis of a nominal de-orbit braking track of a two-body dynamics model design, correcting effects on the reentry angles imposed by a J2 item by iterating working time of an engine; correcting effects on the flying ranges imposed by the J2 item by designing a dynamics integral model; during a guidance process, according to current movement states and information of reentry points, calculating currently required speed and speed gain by use of a closed analytical expression; determining an instruction posture angle of the engine according to direction of the speed gain; and determining a turn-off instruction according to the fact whether the speed gain is zero. According to the invention, high-precision and strong-robustness de-orbit braking guidance can be achieved.

The invention provides a vehicle body dynamic strength analysis method, comprising the following steps: a, simultaneously measure the acceleration information of a solid wheel center and the acceleration and strain information at key points on the vehicle body; b, taking the acceleration information at the solid wheel center as the external load input information of a simulation model, and then simulating the acceleration and strain results of the key points on the vehicle body based on the external load input information; c, comparing the actually measured acceleration and strain information of the key points on the vehicle body with the simulation result; d, adjusting the simulation model based on the comparison result; and e, through the adjusted simulation model, obtaining the stress and strain information of each component of the complete vehicle and carrying out fatigue life analysis on the components.

The invention designs a free floating space mechanical arm self-adaptive fault-tolerant control method with specified tracking performance. The method comprises the following steps that firstly, the problem of unknown objects is captured for a free floating space mechanical arm, and a combined body dynamics model and a general mechanical arm joint actuator fault model are established; secondly, aspecified performance function is preset, and an error value is established after the mechanical arm joint angle is subjected to nonlinear mapping; thirdly, an unknown non-linear part in a radial basis function neural network estimation system is introduced; and finally, the self-adaptive law and the self-adaptive controller of the spatial mechanical arm are designed based on a reverse method. Themethod can be used for solving the problem of tracking control of unknown non-linearity and actuator faults after a free floating space manipulator is used for capturing an unknown object to form a combined body.

The invention discloses a response type robust control method for a four-foot robot under load sudden changes based on the ZMP theory. Firstly, a four-foot robot complete dynamics model with a disturbing term is established; the ZMP calculating formula under load sudden changes is inferred in combination with the robot body dynamics, and the stable gait of the four-foot robot under the situation of the load sudden changes is planned on the basis of the ZMP; and then, a nonlinear disturbance observer model is established, an observer gain matrix is solved through a linear matrix inequation, anobserver observes the disturbance value, compensation is conducted on disturbance through sliding-mode control, and robust tracking of the joint angle is guaranteed. The response type robust control method can overcome disturbance brought to the normal-walking four-foot robot due to the load sudden changes.

The invention discloses a heterogeneous execution body dynamic scheduling device based on credibility and a scheduling method thereof. The dynamic scheduling device comprises a heterogeneous execution body non-activation pool, a heterogeneous execution body activation pool, a dynamic scheduler and an abnormal decision device. The dynamic scheduler activates a plurality of heterogeneous execution bodies from the heterogeneous execution body non-activation pool and puts the heterogeneous execution bodies into the heterogeneous execution body activation pool. The abnormal decision device is used to determine whether an abnormal execution body exists in the heterogeneous execution body activation pool. If the abnormal execution body exists, the operation is forcibly terminated. The abnormal execution body is placed in the heterogeneous execution body non-activation pool, and the credibility is adjusted. According to the invention, the ability of a network device to resist unknown security threats is enhanced, and most of network security attacks can be resisted.

The invention discloses a machine tool moving part realizing method capable of meeting a high-acceleration requirement, which comprises: (1) determining working condition parameters of a moving part, such density, elastic modulus, fraction coefficient, basic overall dimension range and selected motor power; (2) taking the load inertia of the part as an optimal design target function, selecting a design variable, determining a constraint condition and establishing an optimal design mathematical model of the moving part; (3) solving an optimal problem by using a MATLAB algorithm, and determining the optimal overall dimension of the moving part; (4) establishing a three-dimensional model of the part; (5) based on virtual prototype technology, performing simulation analysis on the system through multi-steel body dynamic software, and detecting if the acceleration in motion of the part reaches requirement; (6) analyzing the high-acceleration start-up motion of the moving part by using finite element analysis software, and performing improved design of the weak positions of the moving part; and (7) determining the mechanical error of the part operating at high acceleration so as to perform real-time compensation in computer numerical control (CNC) programming. The method realizes the design of the moving part under a complex working condition by a simple method; and while ensuring product quality, the method greatly shortens product development period and reduces development cost.

The invention provides a robustness dynamic motion method based on reinforced learning and an all-body controller. The method comprises the steps of designing a reinforced learning process surroundinga phase space planning frame (PSP); utilizing a directional walking simplified restriction model inherent in PSP for carrying out phase space planning, reinforced learning problem and learning strategy evaluation; meanwhile, adopting the all-body dynamic controller as an accelerated speed command for calculating in an operation space; utilizing differential positive motion to convert into joint accelerated speed; and optimizing a counter-acting force of a non-drive robot according to the accelerated speed, so that two parameters adopting position or time as outputs can be calculated at the same time, multiple walking modes can be produced, and the process speed is applicable to real-time control. The invention provides a robustness dynamic walking controller formed by a dynamic motion plan program, a robustness reinforced learning process and a novel all-body motion controller, so that higher calculation efficiency is realized, and excellent robustness is obtained.