thrMomentumManagement

Executive Summary

This module reads in the Reaction Wheel (RW) speeds, determines the net RW momentum, and then determines the amount of angular momentum that must be dumped.

A separate thruster firing logic module called thrMomentumDumping will later on compute the thruster on cycling. The module PDF Description contains further information on this module’s function, how to run it, as well as testing.

Message Connection Descriptions

The following table lists all the module input and output messages. The module msg connection is set by the user from python. The msg type contains a link to the message structure definition, while the description provides information on what this message is used for.

Module I/O Messages

Msg Variable Name	Msg Type	Description
deltaHOutMsg	CmdTorqueBodyMsgPayload	output message with the requested inertial angular momentum change
rwSpeedsInMsg	RWSpeedMsgPayload	reaction wheel speed input message
rwConfigDataInMsg	RWArrayConfigMsgPayload	name of the RWA configuration message

Class ThrMomentumManagement

class ThrMomentumManagement : public SysModel

Module configuration message definition.

Public Functions

void reset(uint64_t callTime) override

This method performs a complete reset of the module. Local module variables that retain time varying states between function calls are reset to their default values.

Parameters:

callTime – The clock time at which the function was called (nanoseconds)

Returns:

void

void updateState(uint64_t callTime) override

The RW momentum level is assessed to determine if a momentum dumping maneuver is required. This checking only happens once after the reset function is called. To run this again afterwards, the reset function must be called again.

Parameters:

callTime – The clock time at which the function was called (nanoseconds)

Returns:

void

Public Members

int initRequest

[-] status flag of the momentum dumping management

RWArrayConfigMsgPayload rwConfigParams

[-] struct to store message containing RW config parameters in body B frame

double hs_min

[Nms] minimum RW cluster momentum for dumping

Message<CmdTorqueBodyMsgPayload> deltaHOutMsg

The name of the output message.

ReadFunctor<RWSpeedMsgPayload> rwSpeedsInMsg

[] The name for the reaction wheel speeds message

ReadFunctor<RWArrayConfigMsgPayload> rwConfigDataInMsg

[-] The name of the RWA configuration message

BSKLogger bskLogger = {}

BSK Logging.