41results about How to "Does not affect dynamic performance" patented technology

The invention relates to a zero maintaining mechanism of a2D digital servo valve, which comprises an upper balance wheel connected with a motor shaft, a lower balance wheel connected with a valve plug, a swing shaft and a zero maintaining spring, wherein the middle of the upper balance wheel is provided with a mounting hole for the motor shaft to pass through, the upper end of the upper balance wheel is provided with a through groove in a cutting way, two half parts of the upper end of the upper balance wheel are fixedly connected, the lower end of the upper balance wheel is provided with a notch which is internally provided with the swing shaft, one end of the swing shaft extends into a limit hole of a motor mounting plate, the upper part of the lower balance wheel can be rotatably sleeved on the swing shaft, the lower part of the lower balance wheel is provided with a mounting hole for the valve plug to pass through, the lower end of the lower balance is provided with a through groove in a cutting way, two half parts of the lower end of the lower balance wheel are fixedly connected, the upper end of the zero maintaining spring is fixedly connected with the lower part of the lower balance wheel, and the lower end of the zero maintaining spring is fixedly connected with the motor mounting plate. The invention can effectively ensure zero stability when a digital electro-hydraulic servo system is initialized, and prevent false operation of an executing mechanism, caused by zero offset, from causing potential safety hazards of the masses and equipment.

The invention discloses a method for determining the q-axis current compensation value of a permanent magnet synchronous motor and a method for suppressing pulsation. The method for determining the current compensation value includes: synchronously collecting the q-axis current feedback signal i q and the rotor position signal θ m , based on θ m Determine the position interval of the rotor, add 1 to the number of times in this interval and q Do synchronous averaging, repeat the acquisition until the cumulative value of each interval is greater than the threshold, and all intervals do not overlap to form a rotor cycle; fast Fourier transform the synchronous average value corresponding to each interval arranged in order to obtain the frequency domain feature information, from the frequency feature The amplitude and phase angle of the spatial frequency component to be compensated are determined in the information, and the q-axis current compensation function is constructed; the q-axis current compensation value is obtained based on the position of the motor rotor at the actual compensation time and the current compensation function. The invention converts the time domain information to the space domain, avoids time lag, and the whole process does not affect the dynamic performance of the system, does not require additional devices, does not need to adjust the structure and parameters of each control link, and is simple to operate.

The invention discloses a data fusion method for a flush air data system and an inertial navigation system. The method comprises the steps that 1, navigation information outputted by the inertial navigation system is collected; 2, the air temperature, the static pressure, the density and the sound velocity are calculated on the basis of a selected air model according to the navigation information; 3, the true airspeed, the mach number, the dynamic pressure, the attack angle and the sideslip angle are calculated according to the navigation information, the air temperature, the static pressure, the density and the sound velocity; 4, a resolving initial value is selected according to an air data resolving result of the inertial navigation system at the current moment and an air data fusion processing result at the last moment; 5, the mach number, the attack angle, the sideslip angle, the static pressure and the dynamic pressure are resolved according to the resolving initial value and a surface pressure value at a pressure tap of a flight vehicle; 6, the air data resolving data of the inertial navigation system and a resolving result of the flush air data system are fused. According to the data fusion method for the flush air data system and the inertial navigation system, the common problems existing in the flush air data system can be solved, and the air data measuring performance can be improved.

The invention belongs to the technical field of a lithium ion battery and particularly relates to a lithium ion battery anode pole piece. The lithium ion battery anode pole piece comprises a current collector, a first coating and a second coating, wherein the first coating is arranged on the surface of the current collector; the second coating is arranged on the surface of the first coating; the second coating comprises active materials; the active materials are at least one of graphite, silicon, silicon alloy and tin alloy; the first coating is a composite layer comprising an adhesive and a conductive additive; and the thickness of the first coating is 0.1mum to 5mum. The invention can solve the problem of stripping of a high gram volume anode membrane in the charging and discharging process without increasing the content of the adhesive in the anode membrane and can effectively prevent the expansion and stripping of the anode membrane in the repeated charging and discharging process of the battery on the premise of not influencing the dynamics performance of the battery, so that the safety and the reliability of the battery are improved when the high volume and the high energy density of the battery are implemented. Moreover, the invention also discloses a lithium ion battery comprising the anode pole piece.