32 results about "Acceleration Unit" patented technology

The invention discloses a method for controlling a mobile phone music player. The method includes the steps of enabling a user to set the corresponding relation between the moving directions of a mobile phone and control motions, when music is played in the background, automatically starting an acceleration sensor of the mobile phone, enabling the user to shake the mobile phone, enabling the acceleration sensor to detect the mobile phone shaking directions by the user, and carrying out control over the mobile phone music player according to the detected directions and the corresponding relation set by the user. The method for controlling the mobile phone music player can perceive the different mobile phone shaking directions by the user through the acceleration sensor so as to carry out the corresponding song switching operations or the corresponding volume adjustment operations, and the control of the user over the music player is greatly facilitated. In addition, due to the fact that the corresponding relation between the moving directions and the control motions can be preset by the user, user experience is strengthened.

This invention discloses a method and apparatus for calculating vehicle acceleration. The method establishes gravitational acceleration component equations based on a first set of acceleration models and a second set of acceleration models. It determines the total acceleration vector of a second sensor based on the vector coordinates of the second coordinate system relative to the first coordinate system. Based on the vector coordinates of the second coordinate system relative to the first coordinate system, it calculates the total rotational angular velocity vector and the total rotational angular acceleration vector of the second sensor in the first coordinate system. Based on the total acceleration vector, the total rotational angular velocity vector, and the total rotational angular acceleration vector, it calculates the summed acceleration vector of the second sensor at the origin of the first coordinate system. Based on the resultant acceleration vector and the summed acceleration vector in the first coordinate system, it establishes acceleration equations. Finally, it establishes and solves a joint system of equations based on the gravitational acceleration component equations and the acceleration equations to obtain the motion acceleration of each axis in the first coordinate system. This method improves the accuracy of vehicle acceleration calculation.

To provide a simulator capable of appropriately reproducing acceleration acting on a user.SOLUTION: The control unit of the simulator receives the squaring angle detected by the first detecting unit or the squaring angle calculated from the angular velocity detected by the first detecting unit and the angle of attack detected by the second detecting unit, calculating an inertial force generated in the support plate in the turn action from an equation of motion related to a gravity of the user acting on the support plate, a frictional force between the support plate and the reference surface, and an air resistance acting on the user in the turn action, using a friction coefficient between the support plate and the reference surface in the turn action as a sum of a first friction coefficient between the support plate and the reference surface in a carving turn action in which the turn action is performed in a state of being inclined in the roll direction and a second friction coefficient between the support plate and the reference surface in a squatting turn action in which the turn action is performed so as to rotate in the yaw direction; The turning radius of the support plate in the turn operation is calculated, and the driving part is controlled based on the calculation result.SELECTED DRAWING: Figure 1

The application discloses a kind of acceleration load calculation formula correction method for pipeline stress analysis, comprising the following steps: 1) based on potential flow theory, diffraction theory, establish ship motion equation;2) in AQWA software, the ship length, type width, type depth, design draft, displacement, inertia moment of general FPSO are input, time domain analysis is carried out, and its hydrodynamic coefficient is obtained, then acceleration load extreme value is predicted using SESAM software;3) according to the ship length, type width, type depth of general FPSO, design draft, structural draft, displacement under different working conditions, the acceleration of each degree of freedom is calculated according to ship motion acceleration load calculation formula;4) error analysis is carried out to the acceleration value calculated in steps 2), 3), and the acceleration formula calculation value needs to be corrected if the error is greater than d;5) introduce correction coefficient f, and the acceleration calculation value with error greater than d is corrected until the error is less than d;6) the corrected acceleration can be applied on the pipeline as acceleration load.

The application discloses a portal lifting stable control feedback system and method applied to a forklift AGV, and the system comprises an IMU, an abnormality judgment module, a speed planning module, a feedforward item determination module, a PID control module and a valve control module. The IMU outputs acceleration data; the abnormality judgment module determines a portal lifting abnormality judgment result according to the acceleration data; the speed planning module obtains a target speed and determines a target acceleration when the portal lifting is not abnormal; the feedforward item determination module determines vertical motion state corresponding data of the portal at the current moment according to the acceleration data, and determines a feedforward item according to the target acceleration and the vertical motion state corresponding data; the PID control module determines a compensated speed tracking control instruction according to the target speed and the feedforward item; and the valve control module determines a proportional valve opening degree according to the control instruction, and executes deceleration stop control when the portal lifting is abnormal. The application can improve the consistency between the portal lifting control and the actual motion state and the operation stability.

The invention discloses a servo motor PID position pointing smooth optimization method based on acceleration feedback, and belongs to the technical field of motor control. The method comprises the following steps: acquiring PID parameters, a motor target position and in-place preset time; determining an acceleration section, a deceleration section and an adjustment section in the travel according to the starting point and the target position; executing acceleration section three-loop PID control, and adjusting a position loop command value according to acceleration feedback; executing deceleration section three-ring PID control, and adjusting a position ring command value according to acceleration feedback; adjusting section PID control is executed, and the position loop command value is kept at the final position; according to the invention, the position ring command value during execution of each position ring can be dynamically adjusted according to real-time acceleration measurement and calculation, so that the movement speed of the motor from the initial position to the final position is ensured to be a smooth acceleration-first deceleration-second movement curve; the target position is approached at a low speed, so that the position, speed overshoot and in-place position fluctuation can be effectively reduced, and the pointing precision of the servo motor is remarkably improved.

To provide a detection device and a detection method capable of easily discriminating an abnormality occurrence place of an injection molding device.SOLUTION: The detection device 2 according to the present disclosure includes an acceleration information acquisition unit 21, an acceleration abnormality detection unit 22, and an output unit 23. The acceleration information acquisition unit 21 acquires acceleration information of the plunger during the injection operation. The acceleration abnormality detection unit 22 detects an acceleration abnormality of the plunger in the injection direction and the direction perpendicular to the injection direction based on the acceleration information. The output unit 23 outputs abnormality detection information on the drive mechanism of the plunger when the acceleration abnormality detection unit 22 detects the acceleration abnormality in the injection direction and does not detect the acceleration abnormality in the direction perpendicular to the injection direction.SELECTED DRAWING: Figure 2

This application relates to a satellite orbit prediction method. The method includes: constructing an expression for the gravitational force acting on the satellite based on its mass and distance from Earth; constructing a differential equation for the satellite's acceleration based on Newton's second law and the expression for the gravitational force; solving the differential equation based on the conservative force field characteristics of mechanics, calculating the gravitational potential energy function and its derivative with respect to time; transforming the derivative expression based on the mechanical conservation law that the sum of the derivatives of kinetic energy and gravitational potential energy with respect to time is zero, to obtain the derivative expression for acceleration; converting the time relationship in the derivative expression of acceleration to a radial position relationship based on the principle of conservation of angular momentum; integrating the radial position relationship to obtain the satellite's orbit equation. This method enables satellite orbit prediction.

A method for implementing boxing motion analysis includes: obtaining, from an inertial measurement unit (IMU) on a user, acceleration data at a plurality of time instances within a time period; performing a dynamic adjustment operation on the acceleration data to obtain adjusted acceleration data; performing a signal cutting operation based on the adjusted acceleration data, three average acceleration values when the IMU is in a stationary state, and three threshold values, so as to obtain a plurality of time segments each associated with one swing motion; and performing, with respect to each of the time segments, a quaternion calculation, so as to obtain rotational acceleration data, performing a first integration operation and a second integration operation to obtain a plurality of locations of the IMU over the time segment, and obtaining a trajectory of the IMU in the time segment.

The application discloses a workpiece anti-slipping motion control method for a worktable of a video measuring instrument, and steps include presetting a control speed curve equation, respectively determining a corresponding acceleration curve equation and a displacement curve equation; based on a workpiece target moving distance, a preset moving speed and a maximum acceleration, simultaneously solving the speed curve equation and the acceleration curve equation, and solving unknown constant terms in the equation; using a grating ruler to obtain a real-time position of the workpiece, based on the solved control speed curve equation and the displacement curve equation, solving a motion time through a Newton iteration method; and substituting the motion time into the solved control speed curve equation to obtain an expected motion speed. The application can completely eliminate workpiece slipping, avoid setting a tool clamp and manual clamping, and effectively improve continuous measurement efficiency.

The present invention imparts mechanical characteristics such as elasticity and viscosity when constraining the trajectory of a controlled object onto a figure (a two-dimensional figure or a three-dimensional spatial figure) defined by a signed distance function (SDF). In a trajectory constraint device 1, a rotational angle position of a robot arm 10 is converted into end tip position information using a command value input for a signed distance, and the signed distance between the position information and a bound trajectory is calculated. When the signed distance is being controlled, an acceleration reference value expressed by formula (3) is calculated using a velocity gain and position gain representing virtual elasticity and viscosity. Said acceleration reference value is multiplied with a calculated result of a unit vector applied to a partial differential of the signed distance XSD, converting into an acceleration reference value expressed by formula (4). This acceleration reference value is converted into an acceleration reference value expressed by formula (12) to rotate each shaft of the robot arm 10. The inertia of the rotational angle direction of each shaft is then multiplied by this acceleration reference value, the torque of each shaft is controlled by determining a torque reference value for each shaft, and the trajectory of the robot arm 10 is constrained.

The application discloses a motor state management method, considers that the motor may appear acceleration abnormality under some conditions (for example, control current mutation), and thus may cause safety problems, so that the acceleration value of the motor under the variable speed state can be acquired in the embodiment of the application, and prompt information about the acceleration abnormality of the motor is output when the acceleration value is out of the preset normal acceleration range, so that the abnormal state can be found and solved in time, and the safety hidden danger can be eliminated, the failure rate of the motor is reduced, and the acceleration value is acquired by using a Hall sensor circuit, and the method has the advantages of low modification cost and high precision. The application further discloses a motor state management device and equipment, which have the same beneficial effects as the motor state management method.

The present application is applicable to the field of video processing, and provides a method for generating a rotation direction of a gyroscope. The method comprises: obtaining an acceleration value and an angular velocity value of an IMU in real time, taking the acceleration value as a first acceleration value, and estimating an attitude from the IMU to a world coordinate system; converting the first acceleration value from an IMU coordinate system to a world coordinate system to obtain a second acceleration value; in the world coordinate system, filtering a second acceleration, and filtering out a gravitational acceleration to obtain a third acceleration; converting the third acceleration into the IMU coordinate system to obtain acceleration components in the X axis, the Y axis and the Z axis of a fourth acceleration; and determining the rotation direction of the gyroscope according to the acceleration components.

The invention relates to the technical field of weight measurement. The method comprises the following steps: extracting a gravity vector component in a vertical direction according to acceleration vector information, calculating to obtain a gravity acceleration measured value of a current measurement position based on the gravity vector component, calculating a geomagnetic declination angle according to magnetic field vector information, and measuring the gravity acceleration measured value of the current measurement position according to the geomagnetic declination angle. A preset geomagnetic-latitude mapping rule is matched based on the geomagnetic declination, geographic latitude parameters corresponding to the current measurement position are derived, the geographic latitude parameters are input into a standard gravitational acceleration calculation model, and a standard gravitational acceleration value corresponding to the current measurement position is generated; and constructing a gravity compensation factor according to a difference value between the standard gravitational acceleration value and the measured gravitational acceleration value, and converting an original voltage value output by the weighing sensor based on the gravity compensation factor to obtain a corrected mass value of the target object. The body weight measuring device has the effect of improving the measurement adaptability of body weight measurement.

This application relates to the field of accelerated transport technology, specifically to a cyclic superposition acceleration method and system based on a gravitational field. The method includes: determining the trajectory of a load unit around a natural gravitational field; arranging several acceleration units at intervals along the trajectory; placing the load unit on the trajectory and assigning it an initial velocity; and controlling the acceleration units to provide acceleration energy to the load unit as it passes through them. This application can utilize the natural gravitational environment to achieve stable, low-loss cyclic acceleration, meeting the high-efficiency operation requirements of long-distance transport.

The application provides a method for measuring overload of a special device in a pitching motion test, which comprises arranging an inclination sensor in the axial direction of the pitching motion of the special device, arranging a one-way overload sensor at a measured point, and obtaining the overload of the special device by measuring the included angle between the special device and the horizontal line by the inclination sensor and the tangential direction acceleration of the special device measured by the one-way overload sensor. The method of the application avoids the influence of transverse vibration error and axial acceleration error in principle, simultaneously measures and records the angle change process of the pitching motion test by the inclination sensor in real time, intuitively reflects the dynamic motion trajectory of the special device, and the description of the motion trajectory by the mathematical model is relatively simple, the calculation amount is smaller, and the error accumulation is smaller.

The present invention relates to an accelerometer comprising a support (2), a seismic mass (1) associated with an acceleration sensor having at least one acceleration sensitivity axis (A), the seismic mass (1) being subject to forces resulting from the acceleration to be measured and static forces (such as gravity or inertial forces), and an elastically deformable connecting device (3) connecting the seismic mass (1) to the support (2). The accelerometer also comprises a fixed stop system (5), a movable stop device (34) attached to or forming part of the elastically deformable connecting device (3), and a movement system (4) configured to move the movable stop device (34) relative to the fixed stop system (5) to elastically deform the elastically deformable connecting device (3) in order to apply a restoring force (FR) to the seismic mass (1).

A transducer system having a transducer structure with a plurality of surfaces to be measured and at least one coupling member for removably coupling an object to the transducer structure. The transducer being coupled to the transducer structure and having at least one strain sensor coupled to the plurality of surfaces to be measured for measuring deformation of the transducer structure in a plurality of directions. The system has a dynamic measurement unit for measuring at least one acceleration of the object and at least one controller. The controller is configured to receive the deformation measurements in the plurality of directions; receive the acceleration measurements; and when the object is removably coupled to the coupling member, determine at least one of mass, moment of inertia, and centre of gravity of the object based on the deformation and acceleration measurements.

This invention belongs to the field of ballistic target testing technology and discloses a method for correcting acceleration measurement data of a ballistic target test model. The method includes conducting an acceleration measurement experiment on the ballistic target test model; performing integral processing of the acceleration measurement data; comparing the peak velocity of the test model with the measured initial velocity; and correcting errors in the acceleration measurement data. This method is applicable to extreme overload acceleration environments such as ballistic target tests and artillery tests, where the acceleration amplitude is tens of thousands of gravitational accelerations and the duration is on the order of tens of milliseconds.

In a method for checking an accelerometer in a steering system, which includes an electromechanical steering actuator having an accelerometer that is configured to measure a first acceleration value on a first axis, a second acceleration value on a second axis, and a third acceleration value on a third axis, all three of which are perpendicular to each other, the method includes determining whether the vehicle is stationary or driving. The method further includes, while stationary, determining a correct output of the first acceleration value and the second acceleration value and the third acceleration value depending on the first acceleration value measured by the accelerometer while stationary, the second acceleration value measured by the accelerometer while stationary, and the third acceleration value measured by the accelerometer while stationary.

Systems and methods for predicting a fall include determining, during a first step and a second step, a second point in time at which a displacement value of at least one location on a user is expected to be zero, the second point in time associated with the second step, determining a plurality of acceleration values between the first step and the second step, in one embodiment, a method includes calculating a plurality of acceleration values, adjusting the plurality of acceleration values to generate a plurality of adjusted acceleration values, calculating a plurality of velocity values based on the plurality of adjusted acceleration values, adjusting the plurality of velocity values to generate a plurality of adjusted velocity values, calculating a plurality of displacement values based on the plurality of adjusted velocity values, and predicting a gait parameter of a user based on the plurality of displacement values.

The application provides a nine-axis inertial measurement unit attitude solving method and device based on observation decoupling, the method comprising collecting acceleration data, angular velocity data and magnetic field data, using the acceleration data to only compensate for the error of the X-axis and Y-axis angular velocity, and updating to obtain target attitude quaternions; calculating the heading angle error according to the magnetic field data, constructing a modified quaternion with zero X and Y components and only rotating around the Z-axis of the world coordinate system; multiplying the modified quaternion and the target attitude quaternion to obtain the final attitude quaternion. In this way, by completely decoupling the gravity observation and the geomagnetic observation, the error cross-talk is avoided from the root, the heading correction does not change the horizontal attitude, the roll angle and the pitch angle can be stabilized in complex environments such as magnetic field distortion and ferromagnetic interference, and the attitude drift is effectively suppressed. The overall architecture is simple, the operation amount is small, it is suitable for low-power embedded devices, and the attitude solving accuracy, real-time performance and environmental adaptability are considered.

The invention discloses a jet-driven slide rail equipment acceleration control method and system and a test device, and belongs to the technical field of slide rail test platforms. The method comprises the following steps: acquiring input parameters and initial conditions; performing simulation operation on the input parameters and the initial conditions in a virtual prototype to generate a control strategy; controlling the opening degree of each nozzle in the nozzle module according to the control strategy to realize jet driving of the slide rail equipment so as to preliminarily control the acceleration process of the slide rail equipment; motion data of the sliding rail equipment are obtained in real time; and adjusting the opening degree of each nozzle in the nozzle module according to the control strategy and the motion data so as to realize acceleration control of the slide rail equipment. The control strategy is generated through simulation operation, the control scheme of the pressure and the liquid amount of the liquid storage tank and the nozzle module can be determined without multiple times of real machine debugging, the control strategy can accurately control the acceleration in the whole acceleration time history, and therefore the effects of the acceleration process of any specification and the like can be accurately achieved.

The maximum excitation force can be easily estimated based on the measured acceleration. [Solution] The method includes an acceleration measurement step for measuring the acceleration of a vibration-isolating floor 3 provided on a support structure 2 via a support spring 4 with its spring axis oriented vertically; a maximum acceleration calculation step for determining the maximum acceleration from the time series of accelerations; a primary natural frequency calculation step for determining the primary natural frequency from the Fourier spectrum of accelerations; a transfer function calculation step for determining the transfer function from the input excitation force of the vibration-isolating floor to the response acceleration; and a maximum excitation force calculation step for calculating the maximum excitation force from the maximum acceleration, primary natural frequency, and transfer function.

The invention relates to a method (100) for determining the total mass of a motor vehicle having at least one wheel during operation of the motor vehicle using vehicle longitudinal force (10) and longitudinal acceleration (20)-related signals on a vehicle bus (1), in particular on a vehicle controller area network bus (CAN), on the basis of the Newton's second law of motion, the longitudinal force (10) and the longitudinal acceleration (20) are frequency-filtered, in particular band-pass frequency-filtered, in particular for removing force components and acceleration components caused by aerodynamic drag and / or slowly changing forces or effects of uphill and / or downhill or the like, the mass calculation being carried out only during a predetermined movement of the vehicle, especially during longitudinal or linear or other suitable movements.

The application provides a test method for acceleration transmission change, comprising the following steps: determining an impact point and a test point of a sample to be tested in response to a test requirement; applying a preset impact force to the impact point, and obtaining acceleration data of the impact point under the preset impact force and displacement data and corresponding time data of the test point under the preset impact force; determining acceleration data of the test point based on the displacement data and the corresponding time data of the test point; and determining the acceleration transmission change between the impact point and the test point of the sample to be tested based on the acceleration data of the impact point and the acceleration data of the test point. The test method for acceleration transmission change solves the problem that sensors are prone to damage and falling off and affect the test precision in the traditional test method.

The present application is applicable to the field of video processing, and provides a method for generating a rotation direction of a gyroscope. The method comprises: obtaining an acceleration value and an angular velocity value of an IMU in real time, taking the acceleration value as a first acceleration value, and estimating an attitude from the IMU to a world coordinate system; converting the first acceleration value from an IMU coordinate system to a world coordinate system to obtain a second acceleration value; in the world coordinate system, filtering a second acceleration, and filtering out a gravitational acceleration to obtain a third acceleration; converting the third acceleration into the IMU coordinate system to obtain acceleration components in the X axis, the Y axis and the Z axis of a fourth acceleration; and determining the rotation direction of the gyroscope according to the acceleration components.

A method for determining total mass of a motor vehicle with at least one wheel during operation based on of Newton's second law of dynamics comprising using vehicle longitudinal force and associated longitudinal acceleration related signals existing on a vehicle bus, wherein frequency filtering, is applied to the longitudinal force and the longitudinal acceleration, to remove force components and acceleration components caused by slowly-varying forces or effects of aerodynamic drag and / or uphill slopes and / or downhill slopes, and wherein the mass calculation be only performed during a predetermined, longitudinal or linear or otherwise appropriate, motion of the vehicle.

An acceleration overload relay comprises a solid relay, an overload unit, an overload action time unit and an overload direction selection unit; IN1+ end, IN1- end, IN2+ end and IN2- end; g end and T end; OUT+ end and OUT- end; the solid relay comprises a solid isolation unit and a solid output unit. The acceleration overload relay provided by the application can realize external configuration of an overload acceleration value of the overload relay, external configuration of an overload direction of the overload relay and external configuration of an overload action time of the overload relay through a hardware circuit, external matching resistance, a capacitor and a direct current voltage signal, realize general use of the overload relay and solve the drawbacks that the overload acceleration value and the overload direction of the overload relay cannot be changed.

The application relates to a high-precision measurement method of an acceleration field of a dynamic centrifuge, and belongs to the technical field of mechanical environment testing and measurement. On the premise that the dynamic centrifuge can be regarded as a rigid body, according to the principle that the acceleration of each point on the rigid body linearly changes with position, the specific coefficient of the linear change can be solved by using the actual measurement values of the accelerations of multiple points on the dynamic centrifuge, so that the acceleration measurement value of a sensitive position of a test piece on the dynamic centrifuge is obtained. The partial derivative analysis of the mathematical formula corresponding to the calculation process can obtain the uncertainty of the measurement value. By using the method, an acceleration field measurement system with simple structure, convenient installation, convenient operation and high precision can be designed, and the high-precision measurement of the acceleration field on various dynamic centrifuges such as single-shaft, double-shaft and three-shaft dynamic centrifuges is suitable.