A method of balancing an assembly of a wheel and a tire, may include measuring a maximum-value position of RFV of a tire and marking the measured maximum-value position, as a tire reference position, measuring each of the internal runout and external runout of the wheel, extracting a primary component of a waveform of the measured internal runout and a primary component of a waveform of the measured external runout and setting the former and latter measured primary components to be internal and external runout waveforms, respectively, synthesizing the internal and external runout waveforms and marking a minimum-value position on a synthesis waveform resulting from the synthesizing, as a wheel reference position, and aligning the tire reference position on the tire and the wheel reference position on the wheel to have the same phase and assembling the wheel and the tire.

A method of balancing an assembly of a wheel and a tire, may include measuring a maximum-value position of RFV of a tire and marking the measured maximum-value position, as a tire reference position, measuring each of the internal runout and external runout of the wheel, extracting a primary component of a waveform of the measured internal runout and a primary component of a waveform of the measured external runout and setting the former and latter measured primary components to be internal and external runout waveforms, respectively, synthesizing the internal and external runout waveforms and marking a minimum-value position on a synthesis waveform resulting from the synthesizing, as a wheel reference position, and aligning the tire reference position on the tire and the wheel reference position on the wheel to have the same phase and assembling the wheel and the tire.

A shaft balancing device having first and second supports, which are rotatable about an axis, a motor drivingly coupled to the first support, an electromagnet, which has a plurality of coil units that are disposed circumferentially about the axis, and a control module. The control module is configured to separately control operation of each of the coil units to generate a predetermined composite magnetic field that is an aggregate of a plurality of magnetic fields produced by the plurality of coil units. The predetermined composite magnetic field is fixed relative to a datum that is rotatable about the axis with the first support. The control module is further configured to rotate the predetermined composite magnetic field about the axis at a rotational velocity of the first support.

A shaft balancing device having first and second supports, which are rotatable about an axis, a motor drivingly coupled to the first support, an electromagnet, which has a plurality of coil units that are disposed circumferentially about the axis, and a control module. The control module is configured to separately control operation of each of the coil units to generate a predetermined composite magnetic field that is an aggregate of a plurality of magnetic fields produced by the plurality of coil units. The predetermined composite magnetic field is fixed relative to a datum that is rotatable about the axis with the first support. The control module is further configured to rotate the predetermined composite magnetic field about the axis at a rotational velocity of the first support.

The blades for a rotor of a gas turbine engine are all manufactured to the same design. However, manufacturing tolerances mean that in practice each individual blade is different to the others. It is proposed to arrange the blades around the circumference of the rotor in a manner that limits excessive stress being induced in the blades due to differences in the vibration response between a given blade and its two neighbouring blades.

A vibration-cancelling module includes a first rotor having a first eccentric body, a second rotor having a second eccentric body, and a stator assembly in electromagnetic communication with the first and second rotors. A central shaft extends between the first and second rotors. The first and second rotors rotationally operate about a common rotational axis with respect to one another between a balanced position and a plurality of eccentric positions. A controller has an accelerometer assembly and a rotor-position sensor assembly. The controller delivers an electrical current to the stator assembly at least based upon the accelerometer assembly. A common housing contains the first and second rotors, the stator assembly, the central shaft and the controller.

A vibration-cancelling module includes a first rotor having a first eccentric body, a second rotor having a second eccentric body, and a stator assembly in electromagnetic communication with the first and second rotors. A central shaft extends between the first and second rotors. The first and second rotors rotationally operate about a common rotational axis with respect to one another between a balanced position and a plurality of eccentric positions. A controller has an accelerometer assembly and a rotor-position sensor assembly. The controller delivers an electrical current to the stator assembly at least based upon the accelerometer assembly. A common housing contains the first and second rotors, the stator assembly, the central shaft and the controller.

A method for determining stability of a vehicle having a load suspended from the vehicle is provided. The method can include obtaining measurements from a plurality of sensors positioned on the vehicle, obtaining a measurement from a vehicle accelerometer operative to determine an inclination of the vehicle, determining a position of the load suspended from the vehicle, determining a slung load of the load suspended from the vehicle, using the determined slung load and the determined position of the load suspended from the vehicle, determining tipping moments acting on the vehicle, determining righting moments acting on the vehicle and determining a tipping stability based on the determined tipping moments and determined righting moments.

A method for determining stability of a vehicle having a load suspended from the vehicle is provided. The method can include obtaining measurements from a plurality of sensors positioned on the vehicle, obtaining a measurement from a vehicle accelerometer operative to determine an inclination of the vehicle, determining a position of the load suspended from the vehicle, determining a slung load of the load suspended from the vehicle, using the determined slung load and the determined position of the load suspended from the vehicle, determining tipping moments acting on the vehicle, determining righting moments acting on the vehicle and determining a tipping stability based on the determined tipping moments and determined righting moments.

The present application discloses a method for detecting an abnormity in an optical path or measuring and adjusting of a dynamic balance of a gantry in a CT system, comprising performing, by a gantry controlled by a controller, a test scan along an optical path of the CT system, the optical path being a path along which rays pass from a ray source to a detector. The method further comprises obtaining, by a processor, data relating to the test scan, and based on the data relating to the test scan. The method further comprises determining, by the processor, a status characteristic index of the optical path or an amount of dynamic imbalance of the gantry. The method further comprises analyzing, by the processor, a result of the status characteristic index; determining, by the processor, whether the optical path is abnormal, or determining whether a dynamic balance of the gantry satisfies a requirement based on a result of the analysis of the amount of dynamic imbalance.