21 results about "Torque coefficient" patented technology

This application belongs to the technical field of bolt fastener tightening torque coefficient measurement in low-temperature environments, specifically relating to a device and method for measuring the bolt fastener tightening torque coefficient at -196℃. The device includes a low-temperature environment chamber, a bolt clamp, a nut tightening tool, and an axial force gauge. The low-temperature environment chamber has a liquid nitrogen injection hole. The bolt clamp is installed inside the chamber to clamp the head of the test bolt. One end of the nut tightening tool is located outside the chamber and is used to connect a tightening drive tool and its torque sensor; the other end extends into the chamber to hold the test nut and tighten it onto the bolt thread. The axial force gauge is fitted onto the outer circumference of the bolt thread to measure the preload between the bolt and the nut.

This invention provides an active power regulation method and system that considers instantaneous energy distribution efficiency, relating to the field of wind power grid-connected control technology. The invention establishes a synchronized operation system model based on the system parameters of the wind turbine and synchronous machine, determines the total inherent active power regulation coefficient and synchronous torque coefficient of the system to obtain the conservative instantaneous power of the synchronized system; introduces an active power regulation proportional coefficient into the model and constructs an instantaneous energy function during synchronized system oscillation, analyzing the instantaneous energy distribution law between synchronized units; after a disturbance, the instantaneous energy distribution efficiency is determined based on the instantaneous energy of the synchronous machine, a target efficiency is given, and the active power regulation proportional coefficient is solved based on the total instantaneous energy conservation, thereby calculating the design value of the active power regulation coefficient and setting it in the active power controller of the wind turbine unit, so that when the system detects frequency or power disturbances, the wind turbine participates in regulation according to the design value, thereby improving the power oscillation suppression capability.

The application relates to a planar motor thermal loss homogenization decoupling distribution method and system, belongs to the field of magnetic suspension motor motion control technology, and aims to solve the problem of local thermal loss concentration, thermal expansion deformation and even thermal damage of an overdrive planar motor caused by uneven coil current distribution. The application comprises the following steps: obtaining a reference torque instruction of a current control period and an electromagnetic force and torque coefficient matrix corresponding to a current pose of a motor runner; performing an iterative peak value contraction process according to the reference torque instruction and the electromagnetic force and torque coefficient matrix; in each iteration, first, a nonlinear peak value contraction is performed on a coil current vector according to a current contraction threshold value, and then a new round of coil current vector is obtained through decoupling compensation updating; whether an iteration termination condition is reached is judged, and if yes, the current coil current vector is output as a current decoupling instruction to the planar motor. The application provides a matching system.

The application provides a torque control method and device of a hybrid engine, a hybrid engine and a vehicle, and the method comprises the following steps: obtaining a characteristic data set of the hybrid engine; performing quadratic polynomial fitting on the characteristic data set to obtain a torque coefficient mapping file; in the actual driving process of the vehicle, obtaining a current speed and a target power of a generator, and determining a target torque of the engine at the current speed based on the current speed, the target power and the torque coefficient mapping file; thus, the discrete characteristic data is subjected to quadratic polynomial fitting, which can not only reflect the linear main body law of the power change with the torque, but also compensate for the nonlinear change characteristics such as mechanical loss and electromagnetic loss through the quadratic term, thereby making up for the defect that the nonlinear error cannot be represented; the torque value is quickly solved in reverse by using the real-time input target power, so that the error caused by the traditional table lookup is avoided, and the response speed and the calculation accuracy of the torque calculation in the whole working condition range are effectively improved.

The application relates to a control method, system and device for self-adapting pedal torque and a vehicle, the method comprising the following steps: calculating a pedal coefficient according to a pedal opening degree, and mode switching of a Pedal Map in multiple modes established in advance according to the pedal coefficient; determining a torque coefficient from the selected Pedal Map according to the pedal opening degree and a motor rotating speed; correcting the torque coefficient according to a battery temperature, a battery state of charge and a battery state of health to obtain a battery corrected torque coefficient; correcting the battery corrected torque coefficient according to a motor temperature to obtain a motor-battery corrected torque coefficient; and self-adapting the pedal torque according to the motor-battery corrected torque coefficient. The application adjusts the torque coefficient through key information such as the pedal opening degree, the SOC, the SOH, the battery temperature and the motor temperature, self-adapts the whole vehicle torque output, realizes protection of high-voltage parts such as the battery and the motor, and matches the pedal feeling with the actual power output.

Vehicles and associated systems and procedures are designed for dynamic and adaptive coefficient estimation. One procedure involves capturing a steady state and dynamically determining an axle torque reference value and an associated vehicle speed reference value based on measurement data during the steady state.After reaching steady state, the procedure determines an updated axle torque reference value using the axle torque reference value and a stored axle torque reference value, determines an updated vehicle speed reference value using the vehicle speed reference value and a stored vehicle speed reference value, determines estimated values ​​for one or more nominal axle torque coefficients based on at least one relationship between the updated axle torque reference value and the updated vehicle speed reference value, and determines a torque command to operate the vehicle using the estimated nominal axle torque coefficient values.

Vehicles and related systems and methods are provided for dynamic and adaptive coefficient estimation. One method involves detecting a steady state condition and dynamically determining an axle torque reference value and an associated a vehicle speed reference value based on measurement data during the steady state condition. After the steady state condition, the method determines an updated axle torque reference value using the axle torque reference value and a stored axle torque reference value, determines an updated vehicle speed reference value using the vehicle speed reference value and a stored vehicle speed reference value, determines estimated values for one or more nominal axle torque coefficients based at least on a relationship between the updated axle torque reference value and the updated vehicle speed reference value, and determines a torque command for operating the vehicle using the estimated nominal axle torque coefficient values.

This application discloses a connection structure between the bucket wheel shaft and the bucket body of a stacker-reclaimer, relating to the field of stacker-reclaimer technology. It includes a bucket wheel body and a bucket wheel shaft, connected by expansion sleeves. Expansion sleeves are respectively located on the left and right sides of the connection between the bucket wheel body and the bucket wheel shaft. A sealing end cap is provided on the outer side of the right expansion sleeve, while a split sleeve and a positioning sleeve are sequentially arranged on the outer side of the left expansion sleeve. Both the split sleeve and the positioning sleeve are fitted onto the bucket wheel shaft. The technical advantages of this application are: the double expansion sleeve design transmits axial force, radial force, bending moment, and torque. The torque transmission coefficient, axial force transmission coefficient, force transmission coefficient, and radial pressure coefficient of this scheme are all greater than the safety factor used, resulting in higher safety and durability; the detachable split sleeve allows for quick installation of the left expansion sleeve, while the expanded diameter ensures axial stability and achieves sealing of the left expansion sleeve; and the sealing end cap and baffle seal the right expansion sleeve and the bucket wheel shaft.

The application discloses a modeling method and device of an airplane propeller and electronic equipment. The method relates to the technical field of air propeller testing, and comprises the following steps: acquiring first data of a propeller test bench and environmental data of a position where the propeller test bench is located; determining a target static tension coefficient and a target counter torque coefficient of the airplane propeller based on the first data and the environmental data; and generating a static tension model and a counter torque model of the airplane propeller based on the target static tension coefficient and the target counter torque coefficient. The application solves the technical problem of low modeling accuracy caused by errors in testing experiments.

This application provides a differential protection method and a vehicle; the method includes: determining the instantaneous heat dissipation power of the left and right drive wheels of the differential based on the current temperature of the differential and the ambient temperature where the differential is located, and determining the instantaneous heat generation power of the differential based on the user-input torque of the target vehicle and the speed difference between the left and right drive wheels of the differential. Thus, the current heat load can be determined based on the instantaneous heat dissipation power and the instantaneous heat generation power. Then, based on the current heat load, it is detected whether the operating state of the differential of the target vehicle meets the preset limit conditions. If the operating state of the differential of the target vehicle meets the preset limit conditions, the differential of the target vehicle is protected and controlled according to the protection torque coefficient corresponding to the current heat load.

The present application relates to the field of engineering machinery control technology, specifically to a fuel efficiency optimization method and system based on material type, an image of the forward direction of the engineering machinery is obtained, the texture features and color features of the material in the image are extracted and fused to obtain fused features; the material type is determined according to the contrast and energy in the fused features, and the material wetness is determined according to the brightness standard deviation and saturation in the fused features; according to the material type and wetness, the corresponding torque coefficient, pressure compensation value, speed compensation value and oil supply correction coefficient are determined based on the pre-constructed fuel mapping database, and the engine speed and power of the engineering machinery are adjusted to realize fuel optimization. The texture features and color features of the material are obtained through visual recognition, the material type and the corresponding wetness are classified, the pre-established fuel mapping database is combined to determine different corresponding correction coefficients, and the related parameters of the fuel control system are optimized.

This invention provides a method and apparatus for obtaining tightening torque coefficients based on finite element simulation analysis. The method includes: assembling and tightening an aluminum alloy annular sleeve with a bolt of the same roughness level, recording the tightening torque value and the axial compression of the aluminum alloy annular sleeve; establishing a geometric model of the bolt and aluminum alloy annular sleeve using 3D modeling software and assembling them together; simulating the bolt and aluminum alloy annular sleeve assembly in finite element simulation software, calculating the axial preload required to generate the same axial compression; calculating the tightening torque coefficient corresponding to the roughness level of the mating surface based on the tightening torque value during operation and the axial preload value in the simulation, using the relationship between the two; and calculating the tightening torque coefficient for mating surfaces of other roughness levels using the same method. By combining simple tightening operations on ordinary test pieces with finite element simulation, tightening torque coefficients under different mating surface conditions can be obtained. The operation is simple, easy to master, and the data is reliable.

This invention provides a method and apparatus for optimizing the torque coefficient of a permanent magnet torque motor, relating to the field of permanent magnet motor design optimization technology. The method includes determining the range of values ​​for the parameters to be optimized in the permanent magnet torque motor; determining an optimization objective function based on the torque coefficient equation and torque ripple equation; minimizing the optimization objective function as the objective, using the range of values ​​as constraints, and obtaining the parameters to be optimized by training a surrogate model and performing multi-objective optimization. The apparatus executes the above method. The method and apparatus for optimizing the torque coefficient of a permanent magnet torque motor provided by this invention can accelerate the optimization convergence speed while taking into account torque ripple changes.

The application provides a torque coefficient determination method, device and equipment, the method obtains the first pose change and torque of a target point on a target surface; a first fitting relationship is obtained by fitting the relationship between the obtained torque and the first pose change; the second pose change and pre-tightening force of the target point under the scene of applying a constant-increment pre-tightening force field at different loading steps of an assembly model of a to-be-tested part and a connecting part are obtained from simulation software; the pre-tightening force and the second pose change are fitted to obtain a second fitting relationship; based on the first fitting relationship and the second fitting relationship, the values of the torque and the pre-tightening force corresponding to each target point under the same pose change are found out, so as to determine the torque coefficient of the to-be-tested part based on the values. It can be seen that the technical solution provided in the embodiment can more accurately control the accuracy of the pre-tightening force, thereby improving the measurement accuracy of the precision instrument.

This invention belongs to the field of flight control and fault diagnosis technology for flying-wing unmanned aerial vehicles (UAVs), and relates to an active identification method for the performance loss of multiple control surfaces in flying-wing UAVs. The method superimposes a single, mutually exclusive set of orthogonal multi-sine excitation signals with distinct frequencies onto the closed-loop control commands of the six trailing-edge control surfaces of the flying-wing UAV; it collects three-axis angular velocities, obtains the three-axis torque coefficients through numerical differentiation and inverse kinematics of rigid body rotation; constructs three-channel regression models for roll, pitch, and yaw; and uses a recursive least squares equation error method with a forgetting factor to identify the control derivatives of each control surface online; normalizes the identified control derivative values ​​of each control surface in the three torque channels to obtain channel-by-channel performance coefficients; pre-determines the set of torque channels participating in the voting according to the physical main control action of each control surface; weights the selected channels within a sliding window using the reciprocal of the coefficient of variation as the weight; and uses a dual criterion of coefficient of variation and drift criterion for convergence determination, outputting the final performance coefficients.

This invention provides a method and system for controlling valve opening, belonging to the field of valve control technology. First, the invention acquires the real-time total torque signal and real-time valve opening signal. Based on a preset valve torque coefficient characteristic, the total torque is converted into a virtual pressure measurement value characterizing the transient pressure at the valve inlet. Then, an explicit algebraic relationship based on the Zhukovsky direct water hammer formula, the valve flow coefficient gradient, and the water hammer wave reflection characteristic time is used as the control law. With the virtual pressure measurement value, real-time opening, and the upper limit of allowable water hammer pressure as inputs, the maximum allowable valve closing angular velocity without causing pressure overshoot is calculated in real time. Finally, the valve is controlled to close at a rate not exceeding this velocity. This invention replaces pipeline pressure sensors with software algorithms and online simulation with analytical formulas, resulting in extremely low computational load. It can achieve adaptive active water hammer suppression under all operating conditions on conventional controllers, balancing safety and operational efficiency.

This invention relates to the field of brushless DC motor technology, specifically to a method and system for optimizing control parameters of a brushless DC motor. The method includes establishing an equivalent mathematical model of the hydraulic pump and the motor, constructing an open-loop simulation model of the motor, identifying the back electromotive force coefficient, torque coefficient, and moment of inertia through simulation, introducing a first-order inertial low-pass filter to construct an improved PID controller, establishing a time-domain mathematical model based on the identified parameters, deriving the closed-loop transfer function, determining the desired system response order based on this function, configuring the closed-loop poles, back-calculating the unknown control parameters using the pole placement method, substituting the back-calculated parameters into the improved PID controller to construct a dual-PID control loop, and performing particle swarm optimization to obtain the optimal combination of control parameters. This invention provides theoretical initial values ​​through the pole placement method and achieves adaptive tuning of the dual-PID control loop parameters through particle swarm optimization, solving the problems of difficult manual adjustment, poor disturbance rejection, and lack of engineering calculation methods.

The application belongs to the technical field of torque motor measurement, and discloses a torque motor current torque coefficient and magnetic stiffness measurement system, which comprises a base, a support frame, a horizontal moving frame, a pulley support, a force sensor and a displacement sensor, the base is provided with the support frame, the support frame is provided with the horizontal moving frame capable of moving horizontally relative to the support frame, the horizontal moving frame is provided with the pulley support at the top, the pulley support is provided with a pulley structure, one end of the pulley structure is provided with a load, and the other end of the pulley structure is connected with the armature end of the measured torque motor through the force sensor; the measured torque motor is placed on the base, and the displacement sensor is arranged on the base to measure the displacement of the measured torque motor. The system designed by the application is simple and reliable, the system and method can be used to measure the current torque coefficient and magnetic stiffness of various types of torque motors, and the system has good versatility.