10results about How to "Elimination speed" patented technology

The invention discloses a millimeter-wave radar-based personnel falling detection system, which is characterized in that in order to solve the problem that the noise of original data acquired by a millimeter-wave radar is relatively large, denoising processing is performed on radar echo signals by adopting wavelet transform, and noise interference is effectively suppressed and the signal quality is improved by setting a proper wavelet basis and a proper number of decomposition layers; the method comprises the following steps of: segmenting and aligning radar signals in a tumble process by adopting a dynamic time warping algorithm on the basis of extracting tumble features, and eliminating the influence of tumble speeds and durations of different people through nonlinear time normalization by the algorithm to obtain a normalized tumble feature sequence; a tumble attitude feature library is established, a support vector machine is adopted to carry out classification training on tumble features under different body types and attitudes, a self-adaptive tumble judgment model is obtained, and the generalization ability and the detection accuracy of an algorithm are improved.

The invention discloses a gyroscope drift correction method and device, a computer readable storage medium and an electronic device. The method comprises the following steps: acquiring first attitude information and gyro data of the photoelectric sight-stabilizing system; when the speed given quantity of the display control rocker is zero and the inertial navigation state is normal, recording second attitude information of the photoelectric sight-stabilizing system at the moment; judging whether the first attitude information and the second attitude information meet a preset starting condition or not; if yes, carrying out spatial position closed loop based on the first attitude information and the second attitude information, and carrying out gyro inertial stabilization loop according to a spatial position closed loop result and gyro data; according to the method, the influence of load balance weight and earth rotation speed can be eliminated, the method is adaptive to a low-precision high-null-drift gyroscope and a scene of large drift of the gyroscope under a large pitch angle, the gyroscope drift correction can be automatically carried out in real time, the drift correction error is small, the drift correction effect is remarkable, and the real-time performance is effectively improved. The technical problems that the drift compensation error is large, the effect is not obvious, and the real-time performance is poor are solved.

A powered ankle-foot prosthesis and control method based on electro-hydraulic direct drive, belonging to the field of mechanical and hydraulic technology. The present invention solves the problem that the existing powered ankle-foot prosthesis has a low power density ratio and performs poorly in practical applications. The control module of the present invention is connected to the electro-hydraulic direct drive actuator, and fluid pipelines are distributed in the hydraulic valve block. The hydraulic cylinder, the first energy storage sensor and the first pressure sensor are connected to one fluid pipeline with one end oil port of the bidirectional gear pump, and the hydraulic cylinder, the second accumulator and the second pressure sensor are connected to another fluid pipeline with the other end oil port of the bidirectional gear pump, and the calf prosthesis is connected to the hydraulic cylinder. A powered ankle-foot prosthesis and control method based on electro-hydraulic direct drive of the present invention can absorb the negative work done by the human body on the ankle-foot prosthesis in the dorsiflexion control stage through bilateral accumulators, and reduce the peak power required by the prosthesis drive unit in the power plantar flexion stage, thereby realizing energy recovery and power amplification.

The invention discloses a displacement and speed integrated sensor which is novel and reasonable in structure, a linear displacement measuring part is based on the LVDT sensor principle, the linear displacement measuring part and a speed passive sensing part are rigidly connected to ensure the synchronism of movement, and based on the design, the displacement and speed of a measured object can be directly observed at the same time, and the measurement accuracy is improved. The method is mainly suitable for occasions with high requirements for linear servo control, and the fluctuation problem and the speed phase lag problem caused by differential speed calculation can be fundamentally eliminated. Displacement is measured by adopting an LVDT principle, speed is measured by adopting a passive induction principle, the whole sensor adopts a tandem structure, a speed measuring rod is formed by a radially magnetized annular permanent magnet and a magnetic conductive rod, main magnetic flux can be effectively restrained without providing an external excitation signal, magnetic leakage can be reduced, interference of the magnetic leakage to speed gain parameters can be reduced, and the measurement accuracy is improved. And the measurement accuracy of the sensor is improved.

The present invention provides a method for forming a CMOS image sensor and a CMOS image sensor, wherein the CMOS image sensor comprises: a transfer transistor, a reset transistor, and a composite transistor; the composite transistor is composed of a source follower transistor and a row gate transistor, and is used to realize the functions of the source follower transistor and the row gate transistor; wherein the gate region of the composite transistor is a two-gate structure, and the two gate structures are directly spaced by an oxide layer, so that the speed of the device can be improved while saving area.

The invention discloses a ring amplifier circuit adopting a replica bias and bias enhancement technology. The ring amplifier circuit comprises a first amplification stage, a second amplification stage, a third amplification stage, a replica bias loop and an output stage bias enhancement circuit, in the replica bias loop, the circuit structure of a replica branch is the same as that of the second amplification stage, and the circuit parameter of the replica branch is in 1 / N proportion to that of the second amplification stage; the output stage bias enhancement circuit comprises a second amplification stage bias resistor connected in series between the PMOS transistor and the NMOS transistor of the second amplification stage A2, and a cross connection mode from the output of the second amplification stage to the input of the third amplification stage; the cross connection mode is that the high output node voltage of the second amplification stage is connected to the NMOS transistor input of the third amplification stage, and the low output node voltage of the second amplification stage is connected to the PMOS transistor input of the third amplification stage. By designing a replica bias loop and an output stage bias enhancement technology, comprehensive balance between stable performance and high-speed and high-precision performance requirements under different process, voltage and temperature conditions is realized.

The application discloses a high-precision global fitting method and device based on dominant points, relates to the technical field of computer numerical control machining, and specifically comprises the following implementation steps: firstly, taking the cubic polynomial fitting error as the core basis, dominant points in a tool tip point set are adaptively screened; secondly, according to a point error constraint condition, part of the tool tip points are supplemented as new dominant points through an iterative mode, and then an initial B-spline curve is generated; finally, based on a chord error constraint criterion, part of the midpoints of straight line segments are iteratively supplemented as dominant points, and finally, a target B-spline curve is constructed. The global fitting method effectively optimizes the continuity of the path and the degree of restoration of geometric characteristics under the premise of strictly guaranteeing machining precision, provides a high-quality data basis and technical support for subsequent feed speed planning, and is favorable for improving the overall machining efficiency.

The utility model discloses a chain plate feeding desilting device, which comprises a chain plate feeder and a mud-stone separator, a desilting device is arranged below a chain plate of the chain plate feeder, the desilting device comprises an air knife, the air knife comprises an upper blade, a lower blade and side sealing plates, the upper blade and the lower blade are assembled together, and the side sealing plates surround two sides of the upper blade and the lower blade. A plurality of cavities communicated in sequence are formed between the upper blade and the lower blade, one end of each cavity communicated in sequence is communicated with an air inlet of the blade, the other end of each cavity communicated in sequence is communicated with an air outlet of the air knife, and the air outlets spray towards the chain plate feeder. Compared with the prior art, the air knife has the advantages that the mode that the multiple cavities are communicated is adopted in the air knife, then the cavities are sprayed to the chain plate through the exhaust port, high-viscosity soil on the chain plate is dried and blown out of the chain plate feeding machine, corrosion to the chain plate is avoided, the service life is prolonged, and meanwhile the problem that the high-viscosity soil adheres to the chain plate and is caked is solved.

The present invention relates to a brake clearance and clamping force control method and system of an electronic mechanical brake system. The system of the present invention comprises a self-learning module, an input arbitration module and a feedback arbitration module. The self-learning module is used for self-learning a critical absolute angle. The input arbitration module is used for selecting one of a reference absolute angle calculated by the self-learning module, a reference absolute angle converted by the brake clearance, and a reference absolute angle converted by the reference clamping force as input. The feedback arbitration module is used for selecting one of an actual absolute angle calculated by the absolute angle calculation module and an actual absolute angle converted by the actual clamping force as feedback. The present invention adopts a critical absolute angle self-learning method based on force feedback, which can improve the accuracy and consistency of critical absolute angle acquisition, and at the same time, can eliminate the influence of brake friction pad wear on clamping force control accuracy and response speed.

The application discloses a kind of SMT visual feed and in situ welding integrated device, belong to welding equipment technical field, it includes base support, the base support includes by aluminum alloy section composition support and fixedly connected with the bottom plate on support, three-axis motion mechanism is provided on the base support, one-way limit flexible clamping mechanism is provided on the bottom plate.The application constructs "paste-weld-inspection" full closed loop welding integrated device.Through "in situ zero vibration reflow soldering" technology, PCB board keeps absolute stillness in the liquid phase life cycle of solder melting.Thoroughly eliminate the horizontal acceleration and hand shaking caused by artificial handling, perfectly protect the surface tension self-centering effect of liquid solder, compared with the rigidity limit and heating of traditional equipment, the one-way limit flexible clamping mechanism of the application constructs spring plunger "hot breathing" mechanism, actively absorbs the thermal expansion stress of FR-4 plate material under high temperature, ensure that the board is absolutely flat under high temperature, does not occur to arch upwards.