摘要:
The invention relates to an industrial truck comprising a mast (8), a load-carrying apparatus (36), which can be moved upwards and downwards thereon and which has at least one load-receiving means for receiving a load that is to be transported, and a support structure (24) connecting the load-receiving means to the mast (8), the load receiving means having a load-carrying arrangement (41) connected to the support structure (24), and a device for reducing vibrations, characterised in that the device for reducing vibrations has at least one load support (50), which covers the load-carrying arrangement (41) at the top at least in regions, on which support a load received by the load-carrying apparatus (36) can be supported and which support is provided so as to be movable to a limited extent on the load-carrying arrangement (41) such that it can perform vibration-reducing movements relative to the load-carrying arrangement (41).
摘要:
An external cargo damping system includes lifting gear and a damping assembly. The lifting gear has a lifting body attachment end and an opposed external cargo end, and defines a load path that extends between the lifting body attachment and external cargo ends of the lifting gear. The damping assembly is connected in series with the lifting gear and is disposed along the load path to damp vibratory force transmitted between the lifting gear lifting body attachment and lifting gear ends.
摘要:
A hydraulic system (600) and method for reducing boom dynamics of a boom (30), while providing counter-balance valve protection, includes a hydraulic actuator (110), first and second counter-balance valves (300, 400), first and second control valves (700, 800), and first and second blocking valves (350, 450). A net load (90) is supported by a first chamber (116, 118) of the hydraulic actuator, and a second chamber (118, 116) of the hydraulic actuator may receive fluctuating hydraulic fluid flow from the second control valve to produce a vibratory response (950) that counters environmental vibrations (960) on the boom. The first blocking valve prevents the fluctuating hydraulic fluid flow from opening the first counter-balance valve. The first blocking valve may drain leakage from the first counter-balance valve.
摘要:
The invention relates to a lifting system, comprising a piezoelectric actuator, a support, and a hydraulic stroke multiplier having an input and an output side, wherein with the input side of the hydraulic stroke multiplier said hydraulic stroke multiplier is tied to the piezoelectric actuator, and with the output side of the hydraulic stroke multiplier said hydraulic stroke multiplier is tied to the support. In the method for electrically testing an electronic component, the component is placed on the support of such a lifting system, and is lifted for positioning relative to a test contact. The vibration damper comprises such a lifting system. The machine assembly has a machine and such a vibration damper.
摘要:
The present invention provides a vibration suppression apparatus which includes a first object elastically supported on a base, a second object elastically supported on the first object, and a driving unit configured to drive the first object, and which suppresses a vibration of the second object, comprising a first generation unit configured to generate a first signal, a second generation unit configured to generate a second signal, and a control unit configured to control the driving unit, wherein the control unit controls the driving unit based on the first signal, and after the deviation between the relative distance between the base and the first object, and the first reference distance falls within an allowable range, the control unit controls the driving unit based on the first signal and the second signal.
摘要:
Two or more front-side vibration suppression force generation sources and two or more rear-side vibration suppression force generation sources are interposed between bogies and the vehicle body. A controller calculates a sway high-frequency vibration suppression force for suppressing vibration having a frequency which is not less than a frequency of a centrifugal acceleration acting on the vehicle body when the railway vehicle runs in a curve section. The controller lets at least a part of the front-side vibration suppression force generation sources and at least a part of the rear-side vibration suppression force generation sources output a resultant force of a yaw suppression force and the sway high-frequency vibration suppression force. The controller lets all the remaining vibration suppression force generation sources function as passive dampers when the railway vehicle runs in the curve section. Ride quality of the vehicle in the curve section is thereby improved.
摘要:
A vibration isolator having a housing defining a fluid chamber, piston assembly, tuning passage, and a switchable fluid path assembly for changing the isolation frequency of the vibration isolator. The piston assembly is resiliently disposed within the housing. A vibration tuning fluid is allowed to flow within the housing. Actuation of a valve in the switchable fluid path assembly selectively controls fluid flow within the fluid path of the switchable fluid path assembly.
摘要:
An apparatus includes an active vibration isolation system that includes a vibration isolator, a dual fluid pump in fluid communication with the vibration isolator and a hydraulic system, wherein the dual fluid pump is configured to segregate a tuning fluid from a hydraulic fluid and an electric-hydraulic servo valve in fluid communication with the dual fluid pump.
摘要:
The present invention discloses a revolution vibration suppressing method for pump truck boom, comprising: detecting the vibration severity of the boom in the revolution direction; extracting dynamic characteristic parameters of the boom; calculating a control signal that can be used to control the revolving actuator to compensate the vibration severity according to the vibration severity and the dynamic characteristic parameters extracted; and driving the revolving actuator according to the control signal to move, to suppress the revolution vibration of the boom. In addition, the present invention further provides a revolution vibration suppression controller and a revolution vibration suppression device for a pump truck boom, and a pump truck comprising the device. With the technical scheme described above, the vibration of a pump truck boom in the revolution direction can be suppressed, and therefore the risk of failures of the boom is decreased and the operating safety in the work is improved.
摘要:
A system and method to isolate vibrations from a vibrating structure. The system includes an adjustable vibration isolator that creates a reacting force matching the vibratory force of the vibrating structure. The method includes continuously monitoring the reacting force and vibratory force with a sensor system operably associated with a control unit having an algorithm to determine if adjustment of the vibration isolator is required. If required, the control unit commands a driver to selectively adjust the vibration isolator.