64 results about "Internal resonance" patented technology

The invention relates to a flexible mechanical arm energy consumption shock absorption device based on 2:1 internal resonance, and the shock absorption device consists of a shock absorber installation seat, a torsion spring, a connecting turntable, an inertia adjusting ball, a swinging supporting rod and an adjustable damper, wherein the shock absorber installation seat is connected with a flexible mechanical arm through a screw, the adjustable damper is connected with the shock absorber installation seat through a bolt, the connecting turntable is tightened onto a rotating shaft of the adjustable damper, the torsion spring penetrates the rotating shaft of the adjustable damper, two ends of the torsion spring are respectively connected with the adjustable damper and the connecting turntable, the swinging supporting rod is connected with the connecting turntable in a threading way, and the inertia adjusting ball penetrates the swinging supporting rod via a through hole and is fixedly connected with the swinging supporting rod through a tightening screw; and a flexible mechanical arm energy consumption shock absorption method based on the 2:1 internal resonance comprises twelve steps. The flexible mechanical arm energy consumption shock absorption method and the device can be used for the vibration control of an aerospace flexible arm mechanism, a microelectronic manufacturing flexible arm, robot system flexible mechanical hand and the like and have characteristics of obvious shock absorption effect, simplicity in structure and good robustness.

The object of the invention is a method for charging a rechargeable battery having non-liquid electrolyte, which battery has an internal resonance frequency. The charging process contains at least one charging interval performed with current pulses, the frequency of said current pulses is essentially identical with the internal resonance frequency of the battery to be charged. Following the charging interval consists of periodic current pulses optionally a second relaxation interval is inserted, in which no charging current is applied to the rechargeable battery, within which optionally a second discharging interval is applied. After the second relaxation interval the charging is performed in an interval consists of a continuous charging current, whereafter an optional first relaxation interval is inserted, within which optionally a second discharging interval is applied. This sequence of the above steps can be varied and applied repeatedly until the full charge of the battery is attained.

The invention relates to a biomedical wireless energy transmission system. Through adopting a magnetic coupling resonant wireless energy transmission technology, a transmission distance demand of general biomedical implanted equipment is satisfied, wherein in the technology, a farthest transmission distance can reach a meter-level range; a reconfigurable rectifier is realized to work under three working modes of a half-wave rectifier, a full-wave rectifier and a voltage multiplier, and duty ratios of the different working modes are controlled so that transmission efficiency can be guaranteed and simultaneously output power of an internal receiving circuit is adjustable; and different input capacitances of the rectifier under the different working modes can cause a detuning problem of an internal resonance circuit, therefore, a resonance adjusting unit is introduced so that internal and external resonance circuits are at a same resonant frequency, and transmission efficiency is increased. In addition, through a voltage regulation device and an overvoltage protection circuit, a supply voltage of the biomedical implanted equipment is safe and stable.

A system for transient over voltage protection of a three-phase transformer. Two surge arresters are series connected across each winding of the transformer and the center point connection of the two surge arresters is electrically connected to a middle location of the winding. Three additional surge arresters are electrically connected from each phase to ground in the case of either a delta or Y connected transformer; and / or connected from a neutral point to ground in the case of a Y connected transformer. The system allows for all of the surge arresters to be packaged as an integrated surge arrester system to minimize induced transient over voltages and high stresses on the transformer winding due to internal resonances.

A power transmission tower vibration damper comprises a cylinder-shaped metal box body fixedly installed in the center of the top of a power transmission tower, a high-damping spring made of a martensite shape memory alloy is suspended in the center of an inner top plate of the metal box body, a solid steel ball is tied at the lower end of the high-damping spring, and elastic adhesive tapes are pasted to the inner side wall of the metal box body. According to the power transmission tower vibration damper, under the effect of external excitation, the high-damping spring of the damper conducts damping by depending on internal resonance of the swing modal and the vibration modal of the high-damping spring and the restoring force of the high-damping spring when the solid steel ball and the box body do not collide; when colliding with the box body under the effect of a dynamic load, the solid steel ball applies work by depending on collision force of the box body to the solid steel ball to conduct damping; and the mass ratio of the solid steel ball to the power transmission tower, the inner diameter and the height of the metal box body and the length and the strength of the high-damping spring are obtained through provided computational formulas, and the power transmission tower vibration damper can achieve the best damping effect.

The invention discloses a bistable vortex-induced vibration energy capturing device based on internal resonance. The bistable vortex-induced vibration energy capturing device is composed of a cantilever beam, a piezoelectric plate, a circular section bluff body, a permanent magnet, a spring and a load circuit, wherein the cantilever beam is placed in fluid, vortex-induced vibration generated when the fluid impacts the bluff body is used for promoting the cantilever beam to generate reciprocating vibration, and kinetic energy of the fluid is converted into electric energy by means of the piezoelectric patch. Non-linear restoring force is generated through non-linear magnetic repulsion between the permanent magnets, the device generates bistable vibration, linear elasticity is increased to achieve the internal resonance phenomenon of the energy harvesting device, the internal resonance effect and the bistable vibration mode are combined, and the device is applied to the field of vortex-induced vibration energy harvesting power generation; the vortex-induced vibration energy capturing device is expected to become an effective way for widening the working bandwidth of the vortex-induced vibration energy capturing device and improving power generation efficiency.

A vibrator includes a vibrator element and a base on which the vibrator element is installed. In addition, when n is set to a natural number equal to or greater than 2, and j is set to a natural number equal to or greater than 1 and equal to or less than n, the vibrator element includes n inherent vibration modes having resonance frequencies different from each other, and when a resonance frequency of a main vibration of the vibrator element in the n inherent vibration modes is set to ω1 in a relationship between an arbitrary integer kj and a resonance frequency ωj corresponding to each of the n inherent vibration modes, the following three expressions are all satisfied.Δω≡(∑j=2n⁢kj⁢ωj-k1-ω1) / ω1ω1≥0.1⁢⁢3≤∑j=1n⁢⁢kj≤10

The invention relates to an intelligent graphene acupuncture point plaster. The plaster comprises a graphene circuit arranged inside a plaster body and located at the side, towards the human body, of the wearing face of the acupuncture point plaster, an internal resonance unit adopting a wireless receiving mode and a silver paste layer, wherein the resonance unit is connected with a graphene circuit and comprises a radio frequency part, a simulation part and a digital part, the digital part comprises a digital control part and a storage, the silver paste layer coats the outer surface of the graphene circuit, and the graphene circuit uniformly and rapidly absorbs human biologic waves. Due to the corresponding structural configuration, when a user wears the acupuncture point plaster to an acupuncture point where physical therapy is needed, the human biologic radio waves are absorbed by the graphene circuit, then, due to absorption strengthening of the internal resonance unit, absorbed weak radio waves are amplified and transmitted to the human body through the internal resonance unit, and therefore acupuncture points, meridians and collaterals are stimulated; the effect of tending to acupuncture is achieved, and therefore the problems of human blockage of channels and blockage of vigor are solved.

A two-stage screw compressor of the invention includes a low pressure stage casing provided with a low pressure stage compression mechanism, a discharge casing provided on a discharge side of the low pressure stage casing, a high pressure stage casing provided with a high pressure stage compression mechanism, and intermediate stage casings for connecting the discharge casing and the high pressure stage casing, and accommodating an electric motor. In such a two-stage screw compressor, a cavity is formed on a discharge casing side in the slide valve so as to enlarge the capacity of a discharge space formed in the discharge casing. Thereby, internal resonance occurring in the discharge casing is prevented.

The invention discloses a bistable vortex-induced vibration energy capture device based on internal resonance, which is composed of a cantilever beam, a piezoelectric sheet, a blunt body with a circular cross section, a permanent magnet, a spring and a load circuit. Placed in the fluid, the vortex-induced vibration generated by the impact of the fluid on the blunt body is used to promote the reciprocating vibration of the cantilever beam, and the kinetic energy of the fluid is converted into electrical energy by means of piezoelectric sheets. The present invention utilizes the nonlinear magnetic repulsion between the permanent magnets to generate a nonlinear restoring force, so that the device generates bistable vibration, and increases linear elasticity to realize the internal resonance phenomenon of the energy harvesting device. The present invention combines the internal resonance effect and the bistable vibration mode Combined with the application to the field of vortex-induced vibration energy capture power generation, it is expected to become an effective way to broaden the working bandwidth of vortex-induced vibration energy capture devices and improve power generation efficiency.

An objective of the present invention is to provide a surface emitting laser capable of selectively generating a laser oscillation in the fundamental mode and thereby emitting a single-wavelength laser light. In a surface emitting laser including an active layer and a two-dimensional photonic crystal provided on one side of the active layer, a reflector 45 or 46 is provided at least at a portion of the circumference of the two-dimensional photonic crystal. The reflector has a reflectance distribution in which the reflectance has a maximum value at a position where the amplitude envelope of the fundamental mode of an internal resonance light created within the two-dimensional photonic crystal. This design strengthens the fundamental mode while suppressing the second mode, thus enabling the laser oscillation in the fundamental mode to be selectively obtained, so that a single-wavelength laser light can be emitted.