#video #lecture 9 part 1 on #mechanisms of #flexures. Hopkins demonstrates how to analyze serial flexures as combinations of parallel flexures, showing that a bent blade flexure is kinematically equivalent to a wire flexure.
#video #toread #Disney-Research on kinetic #wire character design #flexures #mechanisms
#video #toread on #wire #flexures about an airpot #mechanisms
#video #toread on bending #wire for retainers #mechanisms
#video #toread about designing #flexures (37') #mechanisms
#video about spherical #flexures #mechanisms by Jelle Rommers
#video about #3D-printing #flexures #mechanisms with mostly the same standard flexures popularized by BYU that everyone shows.
Reinier Kuppens’s #video about 50 randomly generated 2-D dynamical #mechanisms, simulated with the Newton–Euler dynamical equations using mass but without friction. Mostly interesting as a demonstration of kinematic diagrams using links, springs, and kinematic couples of type hinge and slider. Up to eleven links if you count ground, except for the last mechanism, which has 17 and falls apart. The links are displayed as rounded polygons in pastel colors with alpha, with a Secchi disk fiducial in the middle. Some of the mechanisms have only one degree of freedom and nevertheless have very complicated movement paths. “Each mechanism is generated by randomly creating a labeled graph from which overconstraints are removed. Then, for all components, parameters are randomly chosen, such as hinge locations and spring constants. The equations of motion are then solved and an animation is created from the resulting timeseries. Everything programmed in MATLAB. More information can be found in this paper: (#stringbased) ... Various numeric integration schemes can be used, but I used the Runge-Kutta 4 method in combination with a [Newton-Raphson] algorithm to fix the constraints after each time step.” #mecheng
#video by #Akio (the switched reluctance motor guy) about #TCES #energy storage. Dramatically impractical setup trying to use 45 grams of granular CaCl₂ in contact with aluminum (!!), which heats up the 2.5ℓ/s of air from his computer fan from 15.5° to 23°, which by my calculations works out to about 20 watts of heating, 13 watts by his incorrect calculations (6 Wh over 28'). Then he regenerates it (from 55g back down towards 45g) in a steel can (!!!). 6 Wh in 45g is 0.48MJ/kg. He devotes a lot of talking head footage to explaining that he doesn’t know how to use his measuring instruments.
#TCES #energy storage #paper #PDF from last year evaluating 454 (!!) salt hydrates #toread
oh look, Pigdog still has stuff online at stable URLs from the year 02000
#TCES #energy storage dissertation on stabilizing potassium carbonate with porous polymers
#PDF of #TCES #energy storage dissertation on stabilizing potassium carbonate with porous polymers
#PDF #paper about #Boxer, the reconstructible computing medium