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Valvetrain Design

VALDYN Kinematics caters for the design and kinematic analysis of valvetrain systems. The building-block approach means that standard and unconventional valvetrains or partial valvetrains can be modelled. All common valvetrain types can be analysed including linearly translating and swinging followers with or without a push rod and rocker systems. The program can be used to assess an existing cam design or to generate a cam profile using either the Ricardo ‘Multipol’ method or a general spline method. A number of methods of spring pack design are available to allow combined optimisation with cam profile design.

VALDYN Kinematics produces comprehensive outputs to enable assessment of spring/cam design, including cam contact Hertzian stress, oilfilm thickness, cam wear, spring cover, spring stress and spring natural frequency. Data can easily be transferred to VALDYN Dynamics for assessment of the design in the context of the timing drive and to assess dynamic aspects such as spring surge and valve bounce.

Key Features

  • Building-block approach to model construction
  • Caters for novel systems
  • Tribological analysis from kinematic and dynamic standpoints
  • Detailed spring model including coil clash
  • Dynamic analysis in context of complete engine
  • Advanced spline methods for cam design
  • Arbitrary shaped swinging cam follower
  • Spring pack natural frequency


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