A heavy-duty, high-power and large-torque chassis dynamometer for a multi-environmental system, comprising a power testing platform disposed on the ground and a rack located below the power testing platform. A fixed base and a sliding base are sequentially disposed on an inner side of the rack in a length direction of the power testing platform, a pair of first hub assemblies are mounted on the fixed base through a plurality of support frames, a sliding platform is disposed on the sliding base, and a pair of second hub assemblies are mounted on the sliding platform through a plurality of support frames. Tension sensor assemblies are connected to outer circumferences of the first hub assemblies and outer circumferences of the second hub assemblies, and are fixedly disposed on the support frames.

An ink blend consisting of a polymer, a weakly cross-linking agent and a nanomaterial deposited to form a thin polymer-nanomaterial composite film with unique mechanical and electrical properties suitable for high performance strain sensing applications.

A system for measuring power generated by a skier is disclosed. The power generated by the skier may be calculated based upon each complete revolution of a ski pole or ski movement. To do so, the system may include various sensors that measure a force exerted on a ski pole or ski, the angle of the ski pole or ski, and the velocity of the skier at various time instants within each ski pole or ski revolution. A processing unit may calculate power generated by the skier in the skier's direction of travel using the force exerted in the skier's direction of travel during a complete revolution of ski pole (or ski) movement and the velocity of the skier.

Described are shape-memory polymers that have a branched or telechelic prepolymer having a low polydispersity crosslinked with a stoichiometric amount of a multifunctional crosslinker. Also described are methods of making shape-memory polymers by crosslinking a stoichiometric amount of a multifunctional crosslinker with a branched or telechelic prepolymer having a low polydispersity. Methods of measuring the energy storage capacity of a shape-memory polymer are also disclosed.

Pressure sensors are disclosed that may perform health monitoring in-situ in harsh operating environments. The pressure sensors may be based on a Clapp-type oscillator that includes one or more resistors, one or more inductors, capacitors, a sensor, and a transistor. Such pressure sensors may be particularly well-suited various applications, such as gas turbine engines, oil and gas extraction, vehicle engines, and exhaust monitoring.

An evaluation system applied on shaping machine, in which the shaping machine has a controller and an electricity meter. The evaluation system includes a parameter obtaining device and an evaluation device. The parameter obtaining device communicatively coupled to the controller and the electricity meter. The parameter obtaining device is configured to obtain a plurality of parameter data regarding a machining program from the controller and the electricity meter. The evaluation device is electrically coupled to the parameter obtaining device, the evaluation device configured to transform the parameter data into numerical parameters to extract a bolster plate position value and a motor current value, multiply the bolster plate position value and the motor current value with weights and sum up the weighted bolster plate position value and the weighted motor current value as an evaluation score.

A power meter for a bicycle includes a body having a torque input section and a torque output section, the body configured to transmit power between the torque input section and the torque output section. The power meter also includes an electronic device having one or more antennae configured to communicate a signal wirelessly.

Disclosed is an apparatus for measuring an exercise quantity. The apparatus for measuring the exercise quantity includes a base fixed to the exercise machine, a load cell mounted on the upper portion of the base to measure a force applied from the upper side, a load support connected to the upper portion of the load cell to press the load cell, a load support pulley coupled to the upper portion of the load support, a guide pulley disposed beside the load support pulley so that a rotational shaft is parallel to the load support pulley, and a rotation angle measuring sensor measuring a rotation angle according to the rotation of the load support pulley, in which the belt, the cable, the rope, or the chain crosses with the load support pulley and the guide pulley.

The present invention relates to a method for estimating the physical activity exerted by an upper limb (10) of a person (1), the method being characterised in that it comprises the steps of: (a) Acquiring, by inertial measurement means (20) solidly attached to a forearm (11) of said upper limb (10) of said person (1), an angular speed of said forearm (11); (b) Estimating, by data processing means (21, 31, 41), a torque exerted by the muscles of an arm (12) of the upper limb (1) on said forearm (11) as a function of the measured angular speeds, of an orientation of said forearm (11), and of physical parameters of said forearm (11); (c) Determining, by the data processing means (21, 31, 41), a power exerted by the upper limb (10) as a function of the estimated torque and of the measured angular speed.

A power meter for a bicycle includes a body having a torque input section and a torque output section, the body configured to transmit power between the torque input section and the torque output section. The power meter also includes a printed circuit board (PCB) having a substrate and at least one strain measurement device which may be attached to the PCB.